Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator

Textile effluents containing synthetic refractory azo dyes are one of the most important sources of water pollution. However, these kinds of refractory organic pollutants did not resist a persulfate (PS) oxidation process which was correctly activated. In this study, PS was activated by ferrous sulf...

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Autores principales:	Haijun Li, Chong Tang, Min Wang, Changgen Mei, Na Liu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	azo dyes decolorization ferrous sulfide (fes) heterogeneous system persulfate (ps) Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/59a5a9548389405fb7210e9de11d9b84
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spelling	oai:doaj.org-article:59a5a9548389405fb7210e9de11d9b842021-11-06T10:54:24ZDecolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator0273-12231996-973210.2166/wst.2021.085https://doaj.org/article/59a5a9548389405fb7210e9de11d9b842021-04-01T00:00:00Zhttp://wst.iwaponline.com/content/83/7/1703https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Textile effluents containing synthetic refractory azo dyes are one of the most important sources of water pollution. However, these kinds of refractory organic pollutants did not resist a persulfate (PS) oxidation process which was correctly activated. In this study, PS was activated by ferrous sulfide (FeS) in a heterogeneous system to break down azo dyes wastewater. The results showed that all five selected azo dyes were efficiently broken down using the PS/FeS system, except for DY 12, and more than 95% of azo dyes were decolored within 60 minutes. The decolorization efficiency of DR 81 in the PS/FeS system was comparable to PS activated with heat (60 °C) or Fe2+, and was slightly superior to Fe0 powders under the same conditions. Quenching studies indicated that both SO4−• and •OH were formed in the FeS surface and diffused into the solution to facilitate the successive transformation of DR 81, the •OH reaction with DR 81 might the crucial reaction. The coexisting chelating agents in real azo dye effluents at high concentrations had a negative influence on azo dye decolorization by PS/FeS. However, the superior factor of the PS/FeS system was the regenerability and reusability of the heterogeneous catalyst. HIGHLIGHTS Five selected azo dyes were efficiently broken down using the PS/FeS system.; DR 81 decolorization by PS activated with FeS was comparable to other activators.; •OH might play a crucial role on DR 81 decolorization by PS/FeS system.; DR 81 decolorization proceeded by PS/FeS with correct coexisting chelating agents.; FeS was regenerable and recyclable in the heterogeneous PS/FeS system.;Haijun LiChong TangMin WangChanggen MeiNa LiuIWA Publishingarticleazo dyesdecolorizationferrous sulfide (fes)heterogeneous systempersulfate (ps)Environmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 7, Pp 1703-1713 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	azo dyes decolorization ferrous sulfide (fes) heterogeneous system persulfate (ps) Environmental technology. Sanitary engineering TD1-1066
spellingShingle	azo dyes decolorization ferrous sulfide (fes) heterogeneous system persulfate (ps) Environmental technology. Sanitary engineering TD1-1066 Haijun Li Chong Tang Min Wang Changgen Mei Na Liu Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
description	Textile effluents containing synthetic refractory azo dyes are one of the most important sources of water pollution. However, these kinds of refractory organic pollutants did not resist a persulfate (PS) oxidation process which was correctly activated. In this study, PS was activated by ferrous sulfide (FeS) in a heterogeneous system to break down azo dyes wastewater. The results showed that all five selected azo dyes were efficiently broken down using the PS/FeS system, except for DY 12, and more than 95% of azo dyes were decolored within 60 minutes. The decolorization efficiency of DR 81 in the PS/FeS system was comparable to PS activated with heat (60 °C) or Fe2+, and was slightly superior to Fe0 powders under the same conditions. Quenching studies indicated that both SO4−• and •OH were formed in the FeS surface and diffused into the solution to facilitate the successive transformation of DR 81, the •OH reaction with DR 81 might the crucial reaction. The coexisting chelating agents in real azo dye effluents at high concentrations had a negative influence on azo dye decolorization by PS/FeS. However, the superior factor of the PS/FeS system was the regenerability and reusability of the heterogeneous catalyst. HIGHLIGHTS Five selected azo dyes were efficiently broken down using the PS/FeS system.; DR 81 decolorization by PS activated with FeS was comparable to other activators.; •OH might play a crucial role on DR 81 decolorization by PS/FeS system.; DR 81 decolorization proceeded by PS/FeS with correct coexisting chelating agents.; FeS was regenerable and recyclable in the heterogeneous PS/FeS system.;
format	article
author	Haijun Li Chong Tang Min Wang Changgen Mei Na Liu
author_facet	Haijun Li Chong Tang Min Wang Changgen Mei Na Liu
author_sort	Haijun Li
title	Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
title_short	Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
title_full	Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
title_fullStr	Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
title_full_unstemmed	Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator
title_sort	decolorization of azo dyes in a heterogeneous persulfate system using fes as the activator
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/59a5a9548389405fb7210e9de11d9b84
work_keys_str_mv	AT haijunli decolorizationofazodyesinaheterogeneouspersulfatesystemusingfesastheactivator AT chongtang decolorizationofazodyesinaheterogeneouspersulfatesystemusingfesastheactivator AT minwang decolorizationofazodyesinaheterogeneouspersulfatesystemusingfesastheactivator AT changgenmei decolorizationofazodyesinaheterogeneouspersulfatesystemusingfesastheactivator AT naliu decolorizationofazodyesinaheterogeneouspersulfatesystemusingfesastheactivator
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Decolorization of azo dyes in a heterogeneous persulfate system using FeS as the activator

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