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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Main Authors: Prasanna Kumarathilaka, Vimukthi Jayaweera, Hasintha Wijesekara, I. R. M. Kottegoda, S. R. D. Rosa, Meththika Vithanage
Format: Article
Language:English
Published: Hindawi Limited 2016-01-01
Series:Journal of Nanomaterials
Online Access:http://dx.doi.org/10.1155/2016/2813289
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spelling 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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