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Öğe A low-cost and eco-friendly biosorbent material for effective synthetic dye removal from aquatic environment: characterization, optimization, kinetic, isotherm and thermodynamic studies(Taylor & Francis Inc, 2020) Deniz, Fatih; Ersanli, Elif TezelA novel biosorbent was prepared by the surface modification of Zostera marina L. bioresidues and used for the removal of model synthetic dye, methylene blue from aqueous medium in this study. Taguchi design of experiment (DoE) methodology was employed to investigate the influence of significant operational parameters (reaction time, pH of medium and dye concentration) on the biosorption process and to develop a mathematical model for the estimation of biosorption potential of biosorbent. The percentage contribution of each of these process variables on the dye biosorption was found to be 9.03%, 1.95% and 88.84%, respectively. The dye biosorption capacity under the obtained optimum environmental conditions (reaction time of 120 min, pH of 8 and dye concentration of 15 mg L-1) was estimated to be 140.154 mg g(-1) (R-2: 99.83). This value was very close to the experimentally obtained dye removal performance value (140.299 mg g(-1)). These findings indicated the high ability of Taguchi DoE technique in the optimization and simulation of dye biosorption system. The kinetic and equilibrium modeling studies showed that the pseudo-second-order and Langmuir models were the best models for the elucidation of dye removal behavior of biosorbent. Besides, the performance of dye decontamination system was evaluated using the pseudo-second-order kinetic parameters. The thermodynamic analyses displayed that the dye biosorption was a feasible, spontaneous and exothermic process. For large scale dye purification applications, a single-stage batch biosorption system was also designed using the mathematical modeling data. All these results revealed that Z. marina L. bioresidues could be used as a promising alternative biosorbent material for the effective and eco-friendly dye biosorption systems.Öğe A natural macroalgae consortium for biosorption of copper from aqueous solution: Optimization, modeling and design studies(Taylor & Francis Inc, 2018) Deniz, Fatih; Ersanli, Elif TezelIn this study, the capacity of a natural macroalgae consortium consisting of Chaetomorpha sp., Polysiphonia sp., Ulva sp. and Cystoseira sp. species for the removal of copper ions from aqueous environment was investigated at different operating conditions, such as solution pH, copper ion concentration and contact time. These environmental parameters affecting the biosorption process were optimized on the basis of batch experiments. The experimentally obtained data for the biosorption of copper ions onto the macroalgae-based biosorbent were modeled using the isotherm models of Freundlich, Langmuir, Sips and Dubinin-Radushkevich and the kinetic models of pseudo-first-order, pseudo-second-order, Elovich and Weber and Morris. The pseudo-first-order and Sips equations were the most suitable models to describe the copper biosorption from aqueous solution. The thermodynamic data revealed the feasibility, spontaneity and physical nature of biosorption process. Based on the data of Sips isotherm model, the biosorption capacity of biosorbent for copper ions was calculated as 105.370 mg g(-1) under the optimum operating conditions. A single-stage batch biosorption system was developed to predict the real-scale-based copper removal performance of biosorbent. The results of this investigation showed the potential utility of macroalgae consortium for the biosorption of copper ions from aqueous medium.Öğe A novel biowaste-based biosorbent material for effective purification of methylene blue from water environment(Taylor & Francis Inc, 2022) Deniz, Fatih; Ersanli, Elif TezelThe biowaste left over from the fixed oil biorefinery process of Nigella sativa L. plant was used as a new biosorbent for the biosorption of synthetic dye of methylene blue from water environment in this study. The main variables of biosorption operation such as methylene blue concentration, time, pH, and biosorbent amount were optimized by the batch-type experiments. The characterization, kinetics, equilibrium, and thermodynamics works were conducted to show the nature of methylene blue biosorption. The studies of Fourier transform infrared spectroscopy and Scanning electron microscopy indicated that the biosorbent possessed an inhomogeneous surface morphology including many cavities and protuberances, and a rich functional group profile. The optimum values of operating variables studied for the biosorption of methylene blue were determined as methylene blue concentration of 15 mg L-1, time of 360 min, pH of 8, and biosorbent amount of 10 mg. The experimental data of methylene blue biosorption followed the kinetics and isotherm models of pseudo-second-order (R-2: 0.98, AdjR(2): 0.98, and RMSE: 8.97) and Dubinin-Radushkevich (R-2: 0.99, AdjR(2): 0.98, and RMSE: 6.84), respectively, based on the statistical tests of coefficient of determination (R-2), adjusted coefficient of determination (AdjR(2)), and root mean squared error (RMSE). The biosorption of methylene blue was a physical, spontaneous, and energetically favorable process (E-DR: 3.48 kJ mol(-1) and Delta G degrees: (-14.51) - (-10.02) kJ mol(-1)). This residual biological material from the fixed oil biorefinery process exhibited higher biosorption performance (187.46 mg g(-1)) than own unrefined (virgin) form and its modified, activated, and composite forms and many other sorbents reported in the literature. Hereby, the current work showed that this novel biowaste-based material could be used as an environmentally and economically promising biosorbent to effectively purify methylene blue from aquatic environment. NOVELTY STATEMENT Nigella sativa L. (black cumin) is a well-known annual medicinal and aromatic plant from the family of Ranunculaceae. Its seed part has a rich profile containing a wide variety of valuable compounds (fixed oil, carbohydrates, proteins, vitamins, pigments, essential oil, various bioactive substances, etc.), which are widely used in many fields such as cosmetics, food, medicine, and biofuel. After the refinery process to obtain these valuable compounds, a large amount of waste biomass remains. Considering the circular bioeconomy motion, a novel study was conducted on the use of biowaste left over from the fixed oil biorefinery process of N. sativa L. in the field of synthetic dye biosorption in the current work. The synthetic dye of methylene blue was used as a model to test the biosorption behavior of this novel biowaste-based biosorbent material. The main variables of biosorption operation such as synthetic dye concentration, time, pH, and biosorbent amount were optimized by the batch-type experiments. The characterization, kinetics, equilibrium, and thermodynamics studies were performed to show the nature of methylene blue biosorption operation. This residual biological material from the fixed oil biorefinery process exhibited higher biosorption performance than own unrefined (virgin) form and its modified, activated, and composite forms and many other sorbents reported in the literature. Hereby, the current work showed that this novel biowaste-based material could be used as an environmentally and economically promising biosorbent to effectively purify methylene blue from aquatic environment.Öğe A Novel Eco-Biosorbent for Decontamination of Hazardous Dye from Aqueous Medium(Springer/Plenum Publishers, 2017) Deniz, FatihA novel multi-component biosorbent consisted of pine, oak, hornbeam and fir sawdust biomasses was used to eliminate a common hazardous dye (Malachite green, MG) from aqueous solution. The influences of different parameters like solution pH, biosorbent amount, dye concentration and contact time on the removal process were thoroughly studied to evaluate optimum biosorption conditions. The pseudo-first-order, pseudo-second-order, Elovich, logistic and intra-particle diffusion models were used to describe the biosorption kinetics. Logistic model represented the kinetic experimental data well. The experimental equilibrium biosorption data were analyzed by Freundlich, Langmuir and Dubinin-Radushkevich isotherms. Freundlich model fitted better with the experimental data compared to others. In addition, the mean free energy obtained from Dubinin-Radushkevich model and the standard Gibbs free energy change indicated that the nature of biosorption was feasible, spontaneous and physical type. Overall, the novel eco-biosorbent could be used as a promising biosorbent to remove such unsafe dye molecules from aqueous environments.Öğe A renewable biosorbent material for green decontamination of heavy metal pollution from aquatic medium: a case study on manganese removal(Taylor & Francis Inc, 2021) Deniz, Fatih; Tezel Ersanli, ElifIn this study, a renewable biosorbent material was prepared from biological waste of widespread coastal plant,Zostera marinaand employed for the biosorption of heavy metal pollution from water environment in green way. Manganese was selected as a model heavy metal to evaluate the treatment efficiency of prepared biosorbent. The batch biosorption behavior of biosorbent was investigated by the characterization, parameters evaluation, kinetic and equilibrium studies. The characterization study showed that the biosorbent has a rough surface and various binding groups for the heavy metal ions. The heavy metal concentration of 30 mg L-1, time of 60 min, pH of 6 and biosorbent amount of 10 mg were determined as the optimum biosorption conditions. The pseudo-second-order equation was found to be the best among kinetic models applied. The equilibrium data were best explained by Freundlich isotherm. The maximum biosorption efficiency based on Langmuir model was predicted as 58.426 mg g(-1). Hence, the current work presents a renewable alternative biosorbent substance for the green treatment of heavy metal pollution from water medium.Öğe An ecofriendly approach for bioremediation of contaminated water environment: Potential contribution of a coastal seaweed community to environmental improvement(Taylor & Francis Inc, 2018) Deniz, Fatih; Ersanli, Elif TezelHigh levels of heavy metals like copper ions in many industrial based effluents lead to serious environmental and health problems. Biosorption is a potential environmental biotechnology approach for biotreatment of aquatic sites polluted with heavy metal ions. Seaweeds have received great attention for their high bioremediation potential in recent years. However, the co-application of marine macroalgae for removal of heavy metals from wastewater is very limited. Thus, for the first time in literature, a coastal seaweed community composed of Chaetomorpha sp., Polysiphonia sp., Ulva sp. and Cystoseira sp. species was applied to remove copper ions from synthetic aqueous medium in this study. The biosorption experiments in batch mode were conducted to examine the effects of operating variables including pH, biosorbent amount, metal ion concentration and contact time on the biosorption process. The biosorption behavior of biosorbent was described by various equilibrium, kinetic and thermodynamic models. The biosorption of copper ions was strongly influenced by the operating parameters. The results indicated that the equilibrium data of biosorption were best modeled by Sips isotherm model. The values of mean free energy of biosorption computed from Dubinin-Radushkevich isotherm model and the standard Gibbs free energy change indicated a feasible, spontaneous and physical biotreatment system. The pseudo-second-order rate equation successfully defined the kinetic behavior of copper biosorption. The pore diffusion also played role in the control of biosorption process. The maximum copper uptake capacity of biosorbent was found to be greater than those of many other biosorbents. The obtained results revealed that this novel biosorbent could be a promising material for copper ion bioremediation implementations.Öğe An Effectual Biosorbent Substance for Removal of Manganese Ions from Aquatic Environment: A Promising Environmental Remediation Study with Activated Coastal Waste of Zostera marina Plant(Hindawi Ltd, 2020) Deniz, Fatih; Tezel Ersanli, ElifIn the present research paper, a biosorptive remediation practice for an aqueous medium sample polluted with manganese ions was implemented using the activated coastal waste of the Zostera marinaplant. This is the first report in the literature on the utilization of current modified biological waste as a biosorbent substance for the removal of manganese ions from the water environment. The analyses of biosorbent characterization, environmental condition, kinetic, equilibrium, and comparison were performed to introduce the ability of prepared biosorbent for the removal of manganese from the aquatic medium. The biosorbent matter has a rough surface with numerous cavities and cracks and various functional groups for the biosorption of manganese. The environmental conditions significantly affected the manganese purification process, and the optimum working conditions were determined to be biosorbent quantity of 10 mg, pH of 6, manganese concentration of 30 mg L-1, and time of 60 min. The pseudo-second-order model best explained the kinetic data of biosorption operation. The biosorption equilibrium data were best described by the Freundlich isotherm. According to the Langmuir equilibrium model, the maximum purification potency was estimated to be 120.6 mg g(-1). The comparison work revealed that the activated coastal waste of the Z.marinaplant could be utilized as an effectual and promising biosorbent substance for the remediation of an aquatic environment contaminated with manganese ions.Öğe An efficient biosorbent material for green remediation of contaminated water medium(Taylor & Francis Inc, 2024) Deniz, Fatih; Ersanli, Elif TezelThe discharge of large amounts of wastewater carrying various contaminants from many anthropogenic activities into the receiving water environment is a multidimensional issue negatively affecting the ecological system and natural balance in many ways. The removal of pollutants by the biologically-originated materials is an emerging area of interest due to profoundly their environmental friendliness, renewability, sustainability, readily availability, biodegradability, multiplicity, low (or no) economic cost, high affinity, capacity, and stability. In the present study, a popular ornamental plant, Pyracantha coccinea M. J. Roemer, was converted into a green sorbent material with the goal to effectively remove a widespread contaminant (synthetic dye, C. I. Basic Red 46) from synthetic wastewater. The physicochemical characteristics of the prepared biosorbent were determined by the instrumental analyses of FTIR and SEM. The batch experiments of various operational influence parameters were conducted to maximize the system efficiency. The wastewater remediation behavior by the material was investigated by the kinetics, thermodynamics, and isotherm experiments. The biosorbent had a non-uniform and rough surface architecture with a diversity of functional groups. The maximum remediation yield was achieved with the contact duration of 360 min, the pollutant load of 30 mg L-1, the pH of 8, and the biosorbent quantity of 10 mg (0.1 g L-1). The kinetics of the contaminant removal showed good agreement with the pseudo-second-order model. Thermodynamics study indicated that the treatment process was spontaneous and occurred by physisorption. Langmuir model fitted the isotherm data of the biosorption operation well and the maximum pollutant cleanup capacity of the material was determined to be 169.354 mg g(-1). These outcomes showed that P. coccinea M. J. Roemer could be used as a promising material for low-cost and green treatment of wastewater. NOVELTY STATEMENTIn the current study, Pyracantha coccinea M. J. Roemer was converted into a novel alternative sorbent material that is low-cost and green with the goal to effectively remove C. I. Basic Red 46, a widespread synthetic dye contaminant, from wastewater. The results indicated that P. coccinea M. J. Roemer could be used as an efficient biosorbent material for the green remediation of contaminated water medium.Öğe Application of a novel phyco-composite biosorbent for the biotreatment of aqueous medium polluted with manganese ions(Taylor & Francis Inc, 2018) Deniz, Fatih; Ersanli, Elif TezelA composite phyco-biomass including four different marine macroalgae species (Chaetomorpha sp., Polysiphonia sp., Ulva sp., and Cystoseira sp.) was evaluated as a novel biosorbent for the biosorption of manganese ions from aqueous solution. The experimental studies were performed to optimize the operational factors including solution pH, biosorbent amount, initial manganese concentration, and reaction time in a batch-mode biosorption system. The removal yield of the biosorbent for manganese ions increased with increasing pH, manganese ion concentration, and reaction time, while it decreased as the biosorbent dose increased. The obtained kinetic data indicated that the removal of manganese ions by the biosorbent was best described by the pseudo-second-order model and the pore diffusion also contributed to the biosorption process. The results of isotherm and thermodynamic studies showed that the Freundlich model represented the biosorption equilibrium data well and this biotreatment system was feasible, spontaneous, and physical. The maximum manganese uptake capacity of used biosorbent was found to be 55.874 mg g(-1). Finally, a single-stage batch manganese biosorption system was designed and its kinetic performance was evaluated. All these findings revealed that the prepared composite macroalgae biosorbent has a fairly good potential for the removal of manganese ions from the aqueous medium.Öğe Application of residual shell biomass of pistachio for dye biosorption from aquatic environment(Elsevier Science Bv, 2016) Kepekci, Remziye Aysun; Deniz, Fatih[No abstract available]Öğe Bioremediation of Contaminated Water with Unnatural Dye using Blue-Green Alga Spirulina Platensis(Wiley-Blackwell, 2015) Deniz, Fatih; Kepekci, Remziye AysunBlue-green alga Spirulina platensis as a cheap biosorbent was tested for its ability to remove a common azo dye, C.I. Basic Red 46 (C.I. BR 46), from contaminated water. Dye biosorption was a quick process and biosorption reaction reached equilibrium within 60 min. The pseudo-first-order, pseudo-second-order, logistic, and intraparticle diffusion models were used for the kinetic evaluation. The logistic model presented the best fit to the experimental data. The biosorption data were analyzed using Freundlich, Langmuir, and Dubinin-Radushkevich isotherm models. Langmuir model fitted better to the equilibrium data than Freundlich model. The maximum dye biosorption capacity was obtained as 25.46 mg g-1 for the biosorbent. Dubinin-Radushkevich model showed that the predominant mechanism of the dye biosorption was likely physical biosorption. This study suggests promising biosorption potential of S. platensis for C.I. BR 46 removal from contaminated effluents. 2015 American Institute of Chemical Engineers Environ Prog, 34: 14141419, 2015Öğe Bioremoval of Malachite green from water sample by forestry waste mixture as potential biosorbent(Elsevier Science Bv, 2017) Deniz, Fatih; Kepekci, Remziye AysunApplication of cetyltrimethylammoniurn bromide (CTAB) modified multi-component biosorbent composed of pine, oak, hornbeam and fir sawdust biomasses was investigated to remove Malachite green (MG) as a model pollutant from aqueous solution. The effects of pH, dye concentration, biosorbent amount and contact time on the biosorption performance were explored in a batch biosorption system. The biosorption isotherm data were analyzed using Freundlich, Langmuir, Sips and Dubinin-Radushkevich models while the kinetic data of biosorption were modeled with the pseudo-first-order, pseudo-second-order, Elovich, logistic and intra-particle diffusion models. These studies showed that Sips isotherm and logistic model fitted well to the dye biosorption data. The maximum biosorption capacity of biosorbent was calculated to be 52.610 mg g(-1) at the optimized conditions. Thus, the CTAB modified multi-component sawdust biomass can be employed as cost effective and ecological friendly biosorbent in the treatment of industrial effluents containing such unsafe pollutants. (C) 2017 Elsevier B.V. All rights reserved.Öğe Biosorption of Dye from Synthetic Wastewater Using Alga Enriched in Phenolic Compounds(Wiley, 2016) Deniz, Fatih; Kepekci, Remziye AysunIn the current study, we report the preparation of modified biosorbent from Spirulina platensis microalga via the high light application in order to enhance its dye biosorption capacity. The modified biosorbent was characterized with analyses of content of phenolic compounds, FTIR and SEM. The biosorbent was applied to kinetic and equilibrium studies for removal of C.I. Basic Red 46 (C.I. BR 46) from aqueous solution. The kinetic data were best described by the logistic model, while the equilibrium data were best fitted by Langmuir model. The kinetic and isotherm studies indicated that C.I. BR 46 biosorption onto the modified biosorbent occurred in monolayers and the biosorption process was controlled by physical sorption. The level of phenolic compounds in the high light applied biosorbent was defined approximately eightfold higher than in the native biosorbent. Moreover, the high light application provided an increase in the dye biosorption capacity of about 31%, when compared to the raw biosorbent. The maximum biosorption capacity of modified biosorbent was found to be 33.33 mg g(-1) for C.I. BR 46 at the worked biosorption conditions. Thus, this work reveals that high light application can potentially be used to increase biosorption capacity of biosorbents. (C) 2015 American Institute of Chemical Engineers Environ Prog, 35: 737-742, 2016Öğe Biosorption of Food Green 3 by a novel green generation composite biosorbent from aqueous environment(Taylor & Francis Inc, 2017) Deniz, Fatih; Kepekci, Remziye AysunA green type composite biosorbent composed of pine, oak, hornbeam, and fir sawdust biomasses modified with cetyltrimethylammonium bromide (CTAB) was first used for biosorption of an unsafe synthetic food dye, Food Green 3 from liquid medium in this study. Batch studies were carried by observing the effects of pH, dye concentration, biosorbent amount, and contact time. The equilibrium data were analyzed using Freundlich, Langmuir, and Dubinin-Radushkevich equations. Freundlich model gave a better conformity than other equations. The maximum dye removal potential of biosorbent was found to be 36.6mg/g based on Langmuir isotherm. The pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion models were applied to clarify the process kinetics of biosorption. The mechanism studies suggested the biosorption process obeying Elovich kinetics and involving pore diffusion. The estimated values of biosorption free energy from Dubinin-Radushkevich isotherm (E value <8kJ/mol) and thermodynamic studies (0 < G degrees < -20kJ/mol) implied a spontaneous, feasible, and physical process. Hence, this investigation suggested that the CTAB modified mix sawdust biomass could be a promising biosorbent for biosorption of such problematic dyes from impacted media.Öğe Biosorption of heavy metal ions by chemically modified biomass of coastal seaweed community: Studies on phycoremediation system modeling and design(Elsevier Science Bv, 2017) Deniz, Fatih; Karabulut, AbdulkerimBiosorption of heavy metals by seaweeds (marine macroalgae) is a potential environmental biotechnology technique for biotreatment of industrial effluents. However, the co-application of biomasses of different seaweeds for bioremoval of these inorganic pollutants from aqueous phase is very limited. In this study, for the first time, a coastal seaweed community composed of Chaetomorpha sp., Polysiphonia sp., Ulva sp. and Cystoseira sp. species harvested from the north coast of Turkey was first treated with sodium hydroxide and then used as natural biosorbent material for the bioremediation of zinc-containing synthetic wastewater. Batch biosorption experiments were performed to optimize the conditions of environmental parameters (pH, biosorbent quantity, heavy metal concentration and contact time). The biosorption capacity of biosorbent for zinc ions was highly affected by the operating conditions. Kinetic studies showed that the biosorption process was multistep, fast and diffusion controlled. The pseudo-second-order rate model well described the biosorption kinetics. The equilibrium data of zinc biosorption fitted best with Sips isotherm model and the maximum biosorption capacity of biosorbent from this model was calculated as 115.198 mg g(-1). Thermodynamic parameters indicated that the biosorption process was physical and spontaneous. Besides, a single-stage batch biotreatment system was designed and the kinetic performance of this biosorption system was evaluated. The obtained results revealed that the prepared composite biosorbent could be used as efficient novel biosorbent for zinc removal from aqueous effluents. (C) 2017 Elsevier B.V. All rights reserved.Öğe Dye biosorption onto pistachio by-product: A green environmental engineering approach(Elsevier Science Bv, 2016) Deniz, Fatih; Kepekci, Remziye AysunWastes from different sources can be utilized as effective materials in wastewater bioremediation. From this point of view, this study was aimed to investigate the possibility of using pistachio shell, a non-conventional cheap biosorbent, obtained as agricultural solid waste for removal of a reactive-azo dye from water. The batch biosorption studies were carried out as a function of dye concentration and contact time. The experimental results showed that the biosorption process was very rapid (nearly 10 min) and the percent yield of biosorption decreased with an increase in dye quantity. Two- and three-parameter biosorption models were employed to describe the experimental kinetic and isotherm data. The results revealed that the biosorption data were best fitted by the pseudo-second order and Sips models. The maximum biosorption capacity was found to be 109.535 mg g(-1). The magnitude of standard Gibbs free energy change was calculated as -5.184 kJ mol(-1) showing that physical forces were involved in the spontaneous biosorption of dye onto the biosorbent. This research suggests that the pistachio by-product can be an effective and low-cost material for the removal of such hazardous dyes from water. (C) 2016 Elsevier B.V. All rights reserved.Öğe Efficiency of Modified Composite Biosorbent for Bioremoval of Phosphate Ions in Aqueous Area: Process Modeling Studies(Springer/Plenum Publishers, 2017) Deniz, Fatih; Kepekci, Remziye AysunThis paper was focused on the biosorption of phosphate ions from aqueous solution onto the cetyltrimethylammonium bromide (CTAB) modified multi-component biosorbent composed of pine, oak, hornbeam and fir sawdust biomasses. A series of batch tests were conducted and the effects of solution pH, ion concentration, quantity of biosorbent and contact time on the bioremoval of phosphate ions were investigated. The biosorption data of kinetic and equilibrium were modeled using various mathematical equations. The phosphate removal increased with increased ion concentration and decreased with increased pH and biosorbent quantity values. The equilibrium state was reached within 120 min of exposure time. The process kinetics was best described by Elovich model while the isotherm data of biosorption best obeyed Freundlich equation. The obtained results revealed that the use of CTAB modified mix sawdust biosorbent presented interesting options for bioremediation of contaminated environments and waste recycling (as nutrient fertilizer and compost material).Öğe Elimination of a common hazardous dye from aqueous solution by a novel alkaline-treated multi-component biosorbent(Springer, 2017) Deniz, Fatih; Kepekci, Remziye AysunA novel alkaline-treated multi-component biosorbent composed of pine, oak, hornbeam and fir sawdust biomasses was evaluated to eliminate a common hazardous dye [malachite green (MG)] from aqueous solution in this study. Batch biosorption studies were carried out using this base-modified biosorbent under varying biosorption conditions of: pH, MG concentration, modified biosorbent loading and reaction time. The experimental results showed that this easy modification application (using 0.3-M sodium hydroxide) was able to enhance the biosorption potential of natural biosorbent from 35.230 to 78.926 mg g(-1) under the same study conditions. The obtained equilibrium data were modelled using Freundlich, Langmuir, Sips and Dubinin-Radushkevich isotherm models. Also, the biosorption kinetics were analyzed using the pseudo-first-order, pseudo-second-order, logistic and intra-particle diffusion models. It was found that the biosorption data of the isotherm and kinetics were best represented using Sips and logistic models. Hereby, this modified biosorbent can be used for bioremediation of contaminated areas with such deleterious dyes.Öğe Equilibrium and kinetic studies of azo dye molecules biosorption on phycocyanin-extracted residual biomass of microalga Spirulina platensis(Taylor & Francis Inc, 2016) Deniz, Fatih; Kepekci, Remziye AysunThe capability and mechanism of a model azo dye, C.I. Basic Red 46 removal by phycocyanin extraction residue of Spirulina platensis were investigated in this study. The biosorption data were analyzed using Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) isotherm models. Langmuir model was more adequate to represent the data of biosorption equilibrium. The dye biosorption capacity was obtained as 23.06mgg(-1) for the biosorbent. The dye removal potential of phycocyanin-extracted biomass was very close to that of the virgin alga (25.46mgg(-1)). D-R model displayed that the dye was probably to be removed mainly via physical biosorption. The pseudo-first-order, pseudo-second-order, logistic, and intraparticle diffusion models were used for the evaluation of biosorption kinetics. The logistic model presented the best fit to the experimental kinetic data. The intraparticle diffusion model showed that this biosorption process was a complex process involving more than one mechanism. Thus, this waste microalga biomass can be used as a low-cost biosorbent for dye removal.Öğe Evaluation of Calabrian pine sawdust by-product as potential dye biosorbent(Elsevier Science Bv, 2016) Kepekci, Remziye Aysun; Deniz, Fatih[No abstract available]
