Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal

The hydrogen peroxide role in photocatalytic degradation of an anionic azo dye, Acid Orange 7 (AO7), was investigated in a slurry reactor. Commercial ZnO nanoparticles with an average size between 10 to 30 nm were used as catalysts. Optimum conditions for different parameters, including dye concentr...

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Autores principales:	Roxana Rahmati, Behnam Nayebi, Bita Ayati
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	acid orange 7 cod energy consumption kinetic zno Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/a4bdb57bd739454e94f63b8b8b77b2a7
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spelling	oai:doaj.org-article:a4bdb57bd739454e94f63b8b8b77b2a72021-11-06T11:05:27ZInvestigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal0273-12231996-973210.2166/wst.2021.136https://doaj.org/article/a4bdb57bd739454e94f63b8b8b77b2a72021-05-01T00:00:00Zhttp://wst.iwaponline.com/content/83/10/2414https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The hydrogen peroxide role in photocatalytic degradation of an anionic azo dye, Acid Orange 7 (AO7), was investigated in a slurry reactor. Commercial ZnO nanoparticles with an average size between 10 to 30 nm were used as catalysts. Optimum conditions for different parameters, including dye concentration (10–100 mg/L), catalyst concentration (0.1–0.5 g/L), and pH (5–10), were determined first in the absence of H2O2. Changes in the COD were measured for the optimum condition. The impact of adding hydrogen peroxide at different concentrations to the system operating at optimum conditions was investigated. It was observed that 0.416 mM hydrogen peroxide increased the system's efficiency and decreased reaction time by 40 min. The reaction followed first-order kinetic. Hydrogen peroxide alone did not contribute to oxidizing the contaminant, and its positive impact was attributed to decreasing electron-hole recombination in the photocatalytic process. Not only can the hydrogen peroxide-assisted photocatalytic process decrease retention time in treatment units, but it can also result in more contaminant degradation. Therefore, it can reduce the treatment cost. HIGHLIGHTS Improving the efficiency of the slurry photocatalytic process by adding H2O2.; Promoting the process's rate and reaction kinetics’ constants four times by adding 2.5 mM of H2O2.; Determining optimum concentration using energy consumption reaction in order to conduct the research in the minimum energy usage condition.;Roxana RahmatiBehnam NayebiBita AyatiIWA Publishingarticleacid orange 7codenergy consumptionkineticznoEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 10, Pp 2414-2423 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	acid orange 7 cod energy consumption kinetic zno Environmental technology. Sanitary engineering TD1-1066
spellingShingle	acid orange 7 cod energy consumption kinetic zno Environmental technology. Sanitary engineering TD1-1066 Roxana Rahmati Behnam Nayebi Bita Ayati Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
description	The hydrogen peroxide role in photocatalytic degradation of an anionic azo dye, Acid Orange 7 (AO7), was investigated in a slurry reactor. Commercial ZnO nanoparticles with an average size between 10 to 30 nm were used as catalysts. Optimum conditions for different parameters, including dye concentration (10–100 mg/L), catalyst concentration (0.1–0.5 g/L), and pH (5–10), were determined first in the absence of H2O2. Changes in the COD were measured for the optimum condition. The impact of adding hydrogen peroxide at different concentrations to the system operating at optimum conditions was investigated. It was observed that 0.416 mM hydrogen peroxide increased the system's efficiency and decreased reaction time by 40 min. The reaction followed first-order kinetic. Hydrogen peroxide alone did not contribute to oxidizing the contaminant, and its positive impact was attributed to decreasing electron-hole recombination in the photocatalytic process. Not only can the hydrogen peroxide-assisted photocatalytic process decrease retention time in treatment units, but it can also result in more contaminant degradation. Therefore, it can reduce the treatment cost. HIGHLIGHTS Improving the efficiency of the slurry photocatalytic process by adding H2O2.; Promoting the process's rate and reaction kinetics’ constants four times by adding 2.5 mM of H2O2.; Determining optimum concentration using energy consumption reaction in order to conduct the research in the minimum energy usage condition.;
format	article
author	Roxana Rahmati Behnam Nayebi Bita Ayati
author_facet	Roxana Rahmati Behnam Nayebi Bita Ayati
author_sort	Roxana Rahmati
title	Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
title_short	Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
title_full	Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
title_fullStr	Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
title_full_unstemmed	Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
title_sort	investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a4bdb57bd739454e94f63b8b8b77b2a7
work_keys_str_mv	AT roxanarahmati investigatingtheeffectofhydrogenperoxideasanelectronacceptorinincreasingthecapabilityofslurryphotocatalyticprocessindyeremoval AT behnamnayebi investigatingtheeffectofhydrogenperoxideasanelectronacceptorinincreasingthecapabilityofslurryphotocatalyticprocessindyeremoval AT bitaayati investigatingtheeffectofhydrogenperoxideasanelectronacceptorinincreasingthecapabilityofslurryphotocatalyticprocessindyeremoval
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Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal

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