Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI)
In this study, iron nanoparticles (FeNPs) were synthesized via a green method using loquat (Eriobotrya japonica) leaves aqueous extract as a renewable reducing agent. The synthesized FeNPs were characterized by DLS, XRD, FT-IR, SEM/EDX, and TEM analysis, and then, they were used as an adsorbent for...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Chemical Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/2716423 |
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| author | Emel Simla Önal Tolga Yatkın Tural Aslanov Memduha Ergüt Ayla Özer |
| author_facet | Emel Simla Önal Tolga Yatkın Tural Aslanov Memduha Ergüt Ayla Özer |
| author_sort | Emel Simla Önal |
| collection | DOAJ |
| description | In this study, iron nanoparticles (FeNPs) were synthesized via a green method using loquat (Eriobotrya japonica) leaves aqueous extract as a renewable reducing agent. The synthesized FeNPs were characterized by DLS, XRD, FT-IR, SEM/EDX, and TEM analysis, and then, they were used as an adsorbent for Cr(VI) removal from aqueous solutions. Batch adsorption experiments were carried out to investigate the optimum adsorption parameters such as the initial pH of the solution, temperature, initial Cr(VI) concentration, and adsorbent concentration. The optimum adsorption conditions were determined as initial pH 3.0, temperature 45°C, and adsorbent concentration 1 g/L. Also, a linear increase was observed in adsorbed Cr(VI) amounts with the increasing initial Cr(VI) concentrations. The biosynthesized FeNPs showed the high removal levels higher than 90% for Cr(VI) adsorption at a wide range of initial Cr(VI) concentrations (50–500 mg/L). The experimental equilibrium data were modelled with Langmuir and Freundlich isotherm models, and it was found that experimental equilibrium data could be well described by the Langmuir isotherm model. The maximum monolayer coverage capacity of FeNPs for Cr(VI) adsorption was found to be 312.5 mg/g. The pseudo-first-order and the pseudo-second-order kinetic models were applied to the experimental adsorption data, and it was concluded that the data were defined as the best agreement with the pseudo-second-order kinetic model. Weber–Morris model was used to investigate the effect of mass transfer on the adsorption of Cr(VI) onto FeNPs; it was observed that both the film (boundary layer) and intraparticle diffusion affected the studied adsorption process. The thermodynamic studies suggested that Cr(VI) adsorption onto FeNPs was endothermic and nonspontaneous, and the positive ΔS value indicated increased disorder at the solid-solution interface during the adsorption. |
| format | Article |
| id | doaj-art-55b4aff419c44d2fb72f94a16fd7126e |
| institution | Kabale University |
| issn | 1687-806X 1687-8078 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Chemical Engineering |
| spelling | doaj-art-55b4aff419c44d2fb72f94a16fd7126e2025-02-03T05:46:49ZengWileyInternational Journal of Chemical Engineering1687-806X1687-80782019-01-01201910.1155/2019/27164232716423Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI)Emel Simla Önal0Tolga Yatkın1Tural Aslanov2Memduha Ergüt3Ayla Özer4Department of Chemical Engineering, Faculty of Engineering, Mersin University, Mersin 33343, TurkeyDepartment of Chemical Engineering, Faculty of Engineering, Mersin University, Mersin 33343, TurkeyDepartment of Chemical Engineering, Faculty of Engineering, Mersin University, Mersin 33343, TurkeyDepartment of Chemical Engineering, Faculty of Engineering, Mersin University, Mersin 33343, TurkeyDepartment of Chemical Engineering, Faculty of Engineering, Mersin University, Mersin 33343, TurkeyIn this study, iron nanoparticles (FeNPs) were synthesized via a green method using loquat (Eriobotrya japonica) leaves aqueous extract as a renewable reducing agent. The synthesized FeNPs were characterized by DLS, XRD, FT-IR, SEM/EDX, and TEM analysis, and then, they were used as an adsorbent for Cr(VI) removal from aqueous solutions. Batch adsorption experiments were carried out to investigate the optimum adsorption parameters such as the initial pH of the solution, temperature, initial Cr(VI) concentration, and adsorbent concentration. The optimum adsorption conditions were determined as initial pH 3.0, temperature 45°C, and adsorbent concentration 1 g/L. Also, a linear increase was observed in adsorbed Cr(VI) amounts with the increasing initial Cr(VI) concentrations. The biosynthesized FeNPs showed the high removal levels higher than 90% for Cr(VI) adsorption at a wide range of initial Cr(VI) concentrations (50–500 mg/L). The experimental equilibrium data were modelled with Langmuir and Freundlich isotherm models, and it was found that experimental equilibrium data could be well described by the Langmuir isotherm model. The maximum monolayer coverage capacity of FeNPs for Cr(VI) adsorption was found to be 312.5 mg/g. The pseudo-first-order and the pseudo-second-order kinetic models were applied to the experimental adsorption data, and it was concluded that the data were defined as the best agreement with the pseudo-second-order kinetic model. Weber–Morris model was used to investigate the effect of mass transfer on the adsorption of Cr(VI) onto FeNPs; it was observed that both the film (boundary layer) and intraparticle diffusion affected the studied adsorption process. The thermodynamic studies suggested that Cr(VI) adsorption onto FeNPs was endothermic and nonspontaneous, and the positive ΔS value indicated increased disorder at the solid-solution interface during the adsorption.http://dx.doi.org/10.1155/2019/2716423 |
| spellingShingle | Emel Simla Önal Tolga Yatkın Tural Aslanov Memduha Ergüt Ayla Özer Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) International Journal of Chemical Engineering |
| title | Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) |
| title_full | Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) |
| title_fullStr | Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) |
| title_full_unstemmed | Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) |
| title_short | Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI) |
| title_sort | biosynthesis and characterization of iron nanoparticles for effective adsorption of cr vi |
| url | http://dx.doi.org/10.1155/2019/2716423 |
| work_keys_str_mv | AT emelsimlaonal biosynthesisandcharacterizationofironnanoparticlesforeffectiveadsorptionofcrvi AT tolgayatkın biosynthesisandcharacterizationofironnanoparticlesforeffectiveadsorptionofcrvi AT turalaslanov biosynthesisandcharacterizationofironnanoparticlesforeffectiveadsorptionofcrvi AT memduhaergut biosynthesisandcharacterizationofironnanoparticlesforeffectiveadsorptionofcrvi AT aylaozer biosynthesisandcharacterizationofironnanoparticlesforeffectiveadsorptionofcrvi |