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Article

Selective Removal of Hexavalent Chromium from Wastewater by Rice Husk: Kinetic, Isotherm and Spectroscopic Investigation

1
Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad 38000, Pakistan
2
College of Earth and Environmental Sciences, University of the Punjab, Lahore 54000, Pakistan
3
Department of Biological Sciences and Technology, China Medical University, Taichung 406040, Taiwan
4
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Water 2021, 13(3), 263; https://doi.org/10.3390/w13030263
Received: 29 December 2020 / Revised: 7 January 2021 / Accepted: 8 January 2021 / Published: 22 January 2021
(This article belongs to the Special Issue Wastewater Treatment: Current and Future Techniques)
Chromium (Cr) in water bodies is considered as a major environmental issue around the world. In the present study, aqueous Cr(VI) adsorption onto rice husk was studied as a function of various environmental parameters. Equilibrium time was achieved in 2 h and maximum Cr(VI) adsorption was 78.6% at pH 5.2 and 120 mg L−1 initial Cr(VI) concentration. In isotherm experiments, the maximum sorption was observed as 379.63 mg g−1. Among four isotherm models, Dubinin–Radushkevich and Langmuir models showed the best fitting to the adsorption data, suggesting physical and monolayer adsorption to be the dominant mechanism. The kinetic modeling showed that a pseudo-second order model was suitable to describe kinetic equilibrium data, suggesting a fast adsorption rate of Cr(VI). The results of FTIR spectroscopy indicated that mainly –OH and C–H contributed to Cr(VI) adsorption onto rice husk. This paper provided evidence that rice husk could be a cost-effective, environment-friendly and efficient adsorptive material for Cr(VI) removal from wastewater due to its high adsorption capacity. View Full-Text
Keywords: chromium; functional groups; isotherm; rice husk chromium; functional groups; isotherm; rice husk
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MDPI and ACS Style

Khalil, U.; Shakoor, M.B.; Ali, S.; Ahmad, S.R.; Rizwan, M.; Alsahli, A.A.; Alyemeni, M.N. Selective Removal of Hexavalent Chromium from Wastewater by Rice Husk: Kinetic, Isotherm and Spectroscopic Investigation. Water 2021, 13, 263. https://doi.org/10.3390/w13030263

AMA Style

Khalil U, Shakoor MB, Ali S, Ahmad SR, Rizwan M, Alsahli AA, Alyemeni MN. Selective Removal of Hexavalent Chromium from Wastewater by Rice Husk: Kinetic, Isotherm and Spectroscopic Investigation. Water. 2021; 13(3):263. https://doi.org/10.3390/w13030263

Chicago/Turabian Style

Khalil, Usman, Muhammad B. Shakoor, Shafaqat Ali, Sajid R. Ahmad, Muhammad Rizwan, Abdulaziz A. Alsahli, and Mohammed N. Alyemeni. 2021. "Selective Removal of Hexavalent Chromium from Wastewater by Rice Husk: Kinetic, Isotherm and Spectroscopic Investigation" Water 13, no. 3: 263. https://doi.org/10.3390/w13030263

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