Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium
Embedding nanoparticles into an inert material like graphene is a viable option since hybrid materials are more capable than those based on pure nanoparticulates for the removal of toxic pollutants. This study reports for the first time on Cr(VI) removal capacity of novel starch stabilized nanozero...
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doaj-555a94cd672c46a7b361271b77eb514f2020-11-24T22:25:05ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292016-01-01201610.1155/2016/28132892813289Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous MediumPrasanna Kumarathilaka0Vimukthi Jayaweera1Hasintha Wijesekara2I. R. M. Kottegoda3S. R. D. Rosa4Meththika Vithanage5Chemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri LankaMaterials Technology Section, Industrial Technology Institute, Colombo 07, Sri LankaChemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri LankaMaterials Technology Section, Industrial Technology Institute, Colombo 07, Sri LankaDepartment of Physics, University of Colombo, Colombo 03, Sri LankaChemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri LankaEmbedding nanoparticles into an inert material like graphene is a viable option since hybrid materials are more capable than those based on pure nanoparticulates for the removal of toxic pollutants. This study reports for the first time on Cr(VI) removal capacity of novel starch stabilized nanozero valent iron-graphene composite (NZVI-Gn) under different pHs, contact time, and initial concentrations. Starch coated NZVI-Gn composite was developed through borohydrate reduction method. The structure and surface of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and point of zero charge (pHpzc). The surface area and pHpzc of NZVI-Gn composite were reported as 525 m2 g−1 and 8.5, respectively. Highest Cr(VI) removal was achieved at pH 3, whereas 67.3% was removed within first few minutes and reached its equilibrium within 20 min obeying pseudo-second-order kinetic model, suggesting chemisorption as the rate limiting process. The partitioning of Cr(VI) at equilibrium is perfectly matched with Langmuir isotherm and maximum adsorption capacity of the NZVI-Gn composite is 143.28 mg g−1. Overall, these findings indicated that NZVI-Gn composite could be utilized as an efficient and magnetically separable adsorbent for removal of Cr(VI).http://dx.doi.org/10.1155/2016/2813289 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Prasanna Kumarathilaka Vimukthi Jayaweera Hasintha Wijesekara I. R. M. Kottegoda S. R. D. Rosa Meththika Vithanage |
spellingShingle |
Prasanna Kumarathilaka Vimukthi Jayaweera Hasintha Wijesekara I. R. M. Kottegoda S. R. D. Rosa Meththika Vithanage Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium Journal of Nanomaterials |
author_facet |
Prasanna Kumarathilaka Vimukthi Jayaweera Hasintha Wijesekara I. R. M. Kottegoda S. R. D. Rosa Meththika Vithanage |
author_sort |
Prasanna Kumarathilaka |
title |
Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium |
title_short |
Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium |
title_full |
Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium |
title_fullStr |
Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium |
title_full_unstemmed |
Insights into Starch Coated Nanozero Valent Iron-Graphene Composite for Cr(VI) Removal from Aqueous Medium |
title_sort |
insights into starch coated nanozero valent iron-graphene composite for cr(vi) removal from aqueous medium |
publisher |
Hindawi Limited |
series |
Journal of Nanomaterials |
issn |
1687-4110 1687-4129 |
publishDate |
2016-01-01 |
description |
Embedding nanoparticles into an inert material like graphene is a viable option since hybrid materials are more capable than those based on pure nanoparticulates for the removal of toxic pollutants. This study reports for the first time on Cr(VI) removal capacity of novel starch stabilized nanozero valent iron-graphene composite (NZVI-Gn) under different pHs, contact time, and initial concentrations. Starch coated NZVI-Gn composite was developed through borohydrate reduction method. The structure and surface of the composite were characterized by scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and point of zero charge (pHpzc). The surface area and pHpzc of NZVI-Gn composite were reported as 525 m2 g−1 and 8.5, respectively. Highest Cr(VI) removal was achieved at pH 3, whereas 67.3% was removed within first few minutes and reached its equilibrium within 20 min obeying pseudo-second-order kinetic model, suggesting chemisorption as the rate limiting process. The partitioning of Cr(VI) at equilibrium is perfectly matched with Langmuir isotherm and maximum adsorption capacity of the NZVI-Gn composite is 143.28 mg g−1. Overall, these findings indicated that NZVI-Gn composite could be utilized as an efficient and magnetically separable adsorbent for removal of Cr(VI). |
url |
http://dx.doi.org/10.1155/2016/2813289 |
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