Selective oxidation and direct decolorization of cationic dyes by persulfate without activation

The aim of this work was to investigate the selective oxidation and direct decolorization of selected organic dyes (Methylene Blue (MB), Rhodamine B (RhB) and Orange II (OrgII)) by persulfate (PDS) without activation. Results show that the decolorization rate of MB was up to 58.0% within 10 minutes,...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Bing Yang, Qiuping Luo, Qinman Li, Yuan Meng, Li Lingli, Yucheng Liu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	cationic dyes direct decolorization nonradical oxidation peroxydisulfate Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/aa4abf4ecd8d40fc804b30ee1150ddb6
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:aa4abf4ecd8d40fc804b30ee1150ddb6
record_format	dspace
spelling	oai:doaj.org-article:aa4abf4ecd8d40fc804b30ee1150ddb62021-11-06T11:07:43ZSelective oxidation and direct decolorization of cationic dyes by persulfate without activation0273-12231996-973210.2166/wst.2021.177https://doaj.org/article/aa4abf4ecd8d40fc804b30ee1150ddb62021-06-01T00:00:00Zhttp://wst.iwaponline.com/content/83/11/2744https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The aim of this work was to investigate the selective oxidation and direct decolorization of selected organic dyes (Methylene Blue (MB), Rhodamine B (RhB) and Orange II (OrgII)) by persulfate (PDS) without activation. Results show that the decolorization rate of MB was up to 58.0% within 10 minutes, while those of RhB and OrgII were only about 29.6% and 3.0% after 80 minutes, respectively. In comparison with the negligible impacts of pH from 2.0 to 9.0 on MB and OrgII decolorization, RhB decolorization rate obviously varied with the pH changes, and acid pH condition was beneficial for RhB decolorization. Quenching tests implied that the decolorization of dyes by PDS without activation was a nonradical oxidation process rather than sulfate radical oxidation. A plausible mechanism is that the decolorization process is attributed to the charged states of the dyes at different pH conditions, and thus direct electron transfer from dyes to PDS may occur, which is responsible for the bleaching of dyes. This study points out the potential bleaching capability of PDS without activation on cationic dyes, which may have important implications for selective oxidation treatment of dye wastewater. HIGHLIGHTS Persulfate selectively and effectively decolorized cationic dyes or dyes with positive charges under certain pH conditions.; Direct and non-radical oxidation process was proposed for decolorization of Methylene Blue and Rhodamine B by persulfate without activation.; Direct decolorization of dyes by persulfate without activation was not complete, and the degradation of dyes was limited.;Bing YangQiuping LuoQinman LiYuan MengLi LingliYucheng LiuIWA Publishingarticlecationic dyesdirect decolorizationnonradical oxidationperoxydisulfateEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 11, Pp 2744-2752 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cationic dyes direct decolorization nonradical oxidation peroxydisulfate Environmental technology. Sanitary engineering TD1-1066
spellingShingle	cationic dyes direct decolorization nonradical oxidation peroxydisulfate Environmental technology. Sanitary engineering TD1-1066 Bing Yang Qiuping Luo Qinman Li Yuan Meng Li Lingli Yucheng Liu Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
description	The aim of this work was to investigate the selective oxidation and direct decolorization of selected organic dyes (Methylene Blue (MB), Rhodamine B (RhB) and Orange II (OrgII)) by persulfate (PDS) without activation. Results show that the decolorization rate of MB was up to 58.0% within 10 minutes, while those of RhB and OrgII were only about 29.6% and 3.0% after 80 minutes, respectively. In comparison with the negligible impacts of pH from 2.0 to 9.0 on MB and OrgII decolorization, RhB decolorization rate obviously varied with the pH changes, and acid pH condition was beneficial for RhB decolorization. Quenching tests implied that the decolorization of dyes by PDS without activation was a nonradical oxidation process rather than sulfate radical oxidation. A plausible mechanism is that the decolorization process is attributed to the charged states of the dyes at different pH conditions, and thus direct electron transfer from dyes to PDS may occur, which is responsible for the bleaching of dyes. This study points out the potential bleaching capability of PDS without activation on cationic dyes, which may have important implications for selective oxidation treatment of dye wastewater. HIGHLIGHTS Persulfate selectively and effectively decolorized cationic dyes or dyes with positive charges under certain pH conditions.; Direct and non-radical oxidation process was proposed for decolorization of Methylene Blue and Rhodamine B by persulfate without activation.; Direct decolorization of dyes by persulfate without activation was not complete, and the degradation of dyes was limited.;
format	article
author	Bing Yang Qiuping Luo Qinman Li Yuan Meng Li Lingli Yucheng Liu
author_facet	Bing Yang Qiuping Luo Qinman Li Yuan Meng Li Lingli Yucheng Liu
author_sort	Bing Yang
title	Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
title_short	Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
title_full	Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
title_fullStr	Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
title_full_unstemmed	Selective oxidation and direct decolorization of cationic dyes by persulfate without activation
title_sort	selective oxidation and direct decolorization of cationic dyes by persulfate without activation
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/aa4abf4ecd8d40fc804b30ee1150ddb6
work_keys_str_mv	AT bingyang selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation AT qiupingluo selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation AT qinmanli selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation AT yuanmeng selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation AT lilingli selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation AT yuchengliu selectiveoxidationanddirectdecolorizationofcationicdyesbypersulfatewithoutactivation
_version_	1718443752525135872

Selective oxidation and direct decolorization of cationic dyes by persulfate without activation

Ejemplares similares