Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid

Abstract In this study, we investigated the reduction of toxic Cr(VI) to less toxic Cr(III) using ascorbic acid in various aqueous solutions: deionized water, synthetic soft water, synthetic hard water, and real tap water. The experiments were performed using a statistical experimental design. Respo...

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Autores principales:	Qammer Zaib, Hung Suck Park, Daeseung Kyung
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7d07fa6dca85442fb3cea638905f2e4c
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spelling	oai:doaj.org-article:7d07fa6dca85442fb3cea638905f2e4c2021-12-02T18:02:49ZExperimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid10.1038/s41598-021-92535-y2045-2322https://doaj.org/article/7d07fa6dca85442fb3cea638905f2e4c2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92535-yhttps://doaj.org/toc/2045-2322Abstract In this study, we investigated the reduction of toxic Cr(VI) to less toxic Cr(III) using ascorbic acid in various aqueous solutions: deionized water, synthetic soft water, synthetic hard water, and real tap water. The experiments were performed using a statistical experimental design. Response surface methodology (RSM) was used to correlate Cr(VI) reduction (response variable) with experimental parameters such as initial Cr(VI) concentration, humic acid concentration, and ascorbic acid dosage. The empirical model obtained from the experiments was used to estimate and optimize the quantity of ascorbic acid required for the reduction of ≥ 99% Cr(VI) in water. The optimized dosages of ascorbic acid were predicted and experimentally validated for > 99.5% reduction of Cr(VI) (1, 10, 20, and 100 mg/L) in the solutions. Even a solution containing an initial Cr(VI) concentration of 100 mg/L was reduced in concentration ≥ 99.9% with optimal dosage of ascorbic acid (500 mg/L) in the presence of 20 mg/L humic acid. Moreover, the reaction kinetics (kobs-Cr(VI) = 0.71 mM−1 s−1) were sufficient to reduce the ≥ 99.9% Cr(VI) in 20 min. This study sheds new light on the effect of ascorbic acid on Cr(VI) reduction, and provides knowledge fundamental to optimize treatment of Cr(VI) contaminated water to environmentally acceptable endpoints.Qammer ZaibHung Suck ParkDaeseung KyungNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Qammer Zaib Hung Suck Park Daeseung Kyung Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
description	Abstract In this study, we investigated the reduction of toxic Cr(VI) to less toxic Cr(III) using ascorbic acid in various aqueous solutions: deionized water, synthetic soft water, synthetic hard water, and real tap water. The experiments were performed using a statistical experimental design. Response surface methodology (RSM) was used to correlate Cr(VI) reduction (response variable) with experimental parameters such as initial Cr(VI) concentration, humic acid concentration, and ascorbic acid dosage. The empirical model obtained from the experiments was used to estimate and optimize the quantity of ascorbic acid required for the reduction of ≥ 99% Cr(VI) in water. The optimized dosages of ascorbic acid were predicted and experimentally validated for > 99.5% reduction of Cr(VI) (1, 10, 20, and 100 mg/L) in the solutions. Even a solution containing an initial Cr(VI) concentration of 100 mg/L was reduced in concentration ≥ 99.9% with optimal dosage of ascorbic acid (500 mg/L) in the presence of 20 mg/L humic acid. Moreover, the reaction kinetics (kobs-Cr(VI) = 0.71 mM−1 s−1) were sufficient to reduce the ≥ 99.9% Cr(VI) in 20 min. This study sheds new light on the effect of ascorbic acid on Cr(VI) reduction, and provides knowledge fundamental to optimize treatment of Cr(VI) contaminated water to environmentally acceptable endpoints.
format	article
author	Qammer Zaib Hung Suck Park Daeseung Kyung
author_facet	Qammer Zaib Hung Suck Park Daeseung Kyung
author_sort	Qammer Zaib
title	Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
title_short	Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
title_full	Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
title_fullStr	Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
title_full_unstemmed	Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
title_sort	experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7d07fa6dca85442fb3cea638905f2e4c
work_keys_str_mv	AT qammerzaib experimentalmodelingandoptimizationforthereductionofhexavalentchromiuminaqueoussolutionsusingascorbicacid AT hungsuckpark experimentalmodelingandoptimizationforthereductionofhexavalentchromiuminaqueoussolutionsusingascorbicacid AT daeseungkyung experimentalmodelingandoptimizationforthereductionofhexavalentchromiuminaqueoussolutionsusingascorbicacid
_version_	1718378875701952512

Experimental modeling and optimization for the reduction of hexavalent chromium in aqueous solutions using ascorbic acid

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