Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent
Guar gum–nano zinc oxide (GG/nZnO) biocomposite was used as an adsorbent for enhanced removal of Cr(VI) from aqueous solution. The maximum adsorption was achieved at 50 min contact time, 25 mg/L Cr(VI) conc., 1.0 g/L adsorbent dose and 7.0 pH. Langmuir, Freundlich, Dubinin–Kaganer–Radushkevich and T...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2017-05-01
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| Series: | Arabian Journal of Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535213002803 |
| _version_ | 1828923894052945920 |
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| author | Tabrez A. Khan Momina Nazir Imran Ali Ajeet Kumar |
| author_facet | Tabrez A. Khan Momina Nazir Imran Ali Ajeet Kumar |
| author_sort | Tabrez A. Khan |
| collection | DOAJ |
| description | Guar gum–nano zinc oxide (GG/nZnO) biocomposite was used as an adsorbent for enhanced removal of Cr(VI) from aqueous solution. The maximum adsorption was achieved at 50 min contact time, 25 mg/L Cr(VI) conc., 1.0 g/L adsorbent dose and 7.0 pH. Langmuir, Freundlich, Dubinin–Kaganer–Radushkevich and Temkin isotherm models were used to interpret the experimental data. The data obeyed both Langmuir and Freundlich models (R2 = 0.99) indicating a multilayer adsorption of Cr(VI) onto the heterogeneous surface. The linear plots of Temkin isotherm showed adsorbent-adsorbate interactions. Moreover, the energy obtained from DKR isotherm (1.58–2.24 kJ/mol) indicated a physical adsorption of the metal ions onto the adsorbent surface, which implies more feasibility of the regeneration of the adsorbent. GG/nZnO biocomposite adsorbent showed an improved adsorption capacity for Cr(VI) (qm = 55.56 mg/g) as compared to other adsorbents reported in the literature. Adsorption process followed pseudo-second order kinetics; controlled by both liquid-film and intra-particle diffusion mechanisms. Thermodynamic parameters (ΔGo, ΔHo and ΔSo) reflected the feasibility, spontaneity and exothermic nature of adsorption. The results suggested that GG/nZnO biocomposite is economical, eco-friendly and capable to remove Cr(VI) from natural water resources. |
| first_indexed | 2024-12-13T22:46:24Z |
| format | Article |
| id | doaj.art-42a4ec51b057455aa2490d8d0e765da8 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-13T22:46:24Z |
| publishDate | 2017-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-42a4ec51b057455aa2490d8d0e765da82022-12-21T23:28:43ZengElsevierArabian Journal of Chemistry1878-53522017-05-0110S2S2388S239810.1016/j.arabjc.2013.08.019Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbentTabrez A. KhanMomina NazirImran AliAjeet KumarGuar gum–nano zinc oxide (GG/nZnO) biocomposite was used as an adsorbent for enhanced removal of Cr(VI) from aqueous solution. The maximum adsorption was achieved at 50 min contact time, 25 mg/L Cr(VI) conc., 1.0 g/L adsorbent dose and 7.0 pH. Langmuir, Freundlich, Dubinin–Kaganer–Radushkevich and Temkin isotherm models were used to interpret the experimental data. The data obeyed both Langmuir and Freundlich models (R2 = 0.99) indicating a multilayer adsorption of Cr(VI) onto the heterogeneous surface. The linear plots of Temkin isotherm showed adsorbent-adsorbate interactions. Moreover, the energy obtained from DKR isotherm (1.58–2.24 kJ/mol) indicated a physical adsorption of the metal ions onto the adsorbent surface, which implies more feasibility of the regeneration of the adsorbent. GG/nZnO biocomposite adsorbent showed an improved adsorption capacity for Cr(VI) (qm = 55.56 mg/g) as compared to other adsorbents reported in the literature. Adsorption process followed pseudo-second order kinetics; controlled by both liquid-film and intra-particle diffusion mechanisms. Thermodynamic parameters (ΔGo, ΔHo and ΔSo) reflected the feasibility, spontaneity and exothermic nature of adsorption. The results suggested that GG/nZnO biocomposite is economical, eco-friendly and capable to remove Cr(VI) from natural water resources.http://www.sciencedirect.com/science/article/pii/S1878535213002803Guar gum–nanozinc oxide biocompositeChromium(VI)AdsorptionIsothermsKineticsThermodynamics |
| spellingShingle | Tabrez A. Khan Momina Nazir Imran Ali Ajeet Kumar Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent Arabian Journal of Chemistry Guar gum–nanozinc oxide biocomposite Chromium(VI) Adsorption Isotherms Kinetics Thermodynamics |
| title | Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent |
| title_full | Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent |
| title_fullStr | Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent |
| title_full_unstemmed | Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent |
| title_short | Removal of Chromium(VI) from aqueous solution using guar gum–nano zinc oxide biocomposite adsorbent |
| title_sort | removal of chromium vi from aqueous solution using guar gum nano zinc oxide biocomposite adsorbent |
| topic | Guar gum–nanozinc oxide biocomposite Chromium(VI) Adsorption Isotherms Kinetics Thermodynamics |
| url | http://www.sciencedirect.com/science/article/pii/S1878535213002803 |
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