Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

In this study, polypyrrole-modified red mud (PRM) was prepared for the efficient removal of anionic dyes (methyl orange and Congo red) from aqueous solutions. The phytotoxicity (bean sprouts) of the dye solution before and after dye removal was investigated. Adsorption kinetics confirmed that the ad...

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Autores principales:	Feng Zhang, Yue Yin, Chunlei Qiao, Ya-nan Luan, Mengyan Guo, Yihua Xiao, Changqing Liu
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi - SAGE Publishing 2021
Materias:	Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/38a596287ff44e97b79409b5f3b130be
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spelling	oai:doaj.org-article:38a596287ff44e97b79409b5f3b130be2021-11-15T01:19:58ZAnionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment2048-403810.1155/2021/7694783https://doaj.org/article/38a596287ff44e97b79409b5f3b130be2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7694783https://doaj.org/toc/2048-4038In this study, polypyrrole-modified red mud (PRM) was prepared for the efficient removal of anionic dyes (methyl orange and Congo red) from aqueous solutions. The phytotoxicity (bean sprouts) of the dye solution before and after dye removal was investigated. Adsorption kinetics confirmed that the adsorption of methyl orange (MO) and Congo red (CR) on PRM was controlled by chemical reactions between the functional groups of polypyrrole and dyes. From Langmuir isotherm fitting, we found the theoretical adsorption capacities of MO and CR on PRM were 194.1 and 314.9 mg/g, respectively. The adsorption progress of MO and CR on PRM was found to be spontaneous and endothermic. The column studies demonstrated that, under dynamic flow, the PRM can efficiently remove MO and CR from aqueous solution, with adsorption capacities of 31.08 and 55.04 mg/g, respectively. In the toxicity test, the phytotoxicity of the column effluents (after dye removal) was significantly lowered compared to the initial dye influents. After the removal of MO and CR, the average root length of bean sprouts was increased from 3.30 cm to 5.18 cm and from 3.01 cm to 7.00 cm, respectively. These findings highlighted the efficient removal of dyes by PRM from aqueous solution, demonstrating the possible application of PRM for the removal of dye from dye-contaminated wastewaters.Feng ZhangYue YinChunlei QiaoYa-nan LuanMengyan GuoYihua XiaoChangqing LiuHindawi - SAGE PublishingarticlePhysical and theoretical chemistryQD450-801ENAdsorption Science & Technology, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physical and theoretical chemistry QD450-801
spellingShingle	Physical and theoretical chemistry QD450-801 Feng Zhang Yue Yin Chunlei Qiao Ya-nan Luan Mengyan Guo Yihua Xiao Changqing Liu Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
description	In this study, polypyrrole-modified red mud (PRM) was prepared for the efficient removal of anionic dyes (methyl orange and Congo red) from aqueous solutions. The phytotoxicity (bean sprouts) of the dye solution before and after dye removal was investigated. Adsorption kinetics confirmed that the adsorption of methyl orange (MO) and Congo red (CR) on PRM was controlled by chemical reactions between the functional groups of polypyrrole and dyes. From Langmuir isotherm fitting, we found the theoretical adsorption capacities of MO and CR on PRM were 194.1 and 314.9 mg/g, respectively. The adsorption progress of MO and CR on PRM was found to be spontaneous and endothermic. The column studies demonstrated that, under dynamic flow, the PRM can efficiently remove MO and CR from aqueous solution, with adsorption capacities of 31.08 and 55.04 mg/g, respectively. In the toxicity test, the phytotoxicity of the column effluents (after dye removal) was significantly lowered compared to the initial dye influents. After the removal of MO and CR, the average root length of bean sprouts was increased from 3.30 cm to 5.18 cm and from 3.01 cm to 7.00 cm, respectively. These findings highlighted the efficient removal of dyes by PRM from aqueous solution, demonstrating the possible application of PRM for the removal of dye from dye-contaminated wastewaters.
format	article
author	Feng Zhang Yue Yin Chunlei Qiao Ya-nan Luan Mengyan Guo Yihua Xiao Changqing Liu
author_facet	Feng Zhang Yue Yin Chunlei Qiao Ya-nan Luan Mengyan Guo Yihua Xiao Changqing Liu
author_sort	Feng Zhang
title	Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
title_short	Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
title_full	Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
title_fullStr	Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
title_full_unstemmed	Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment
title_sort	anionic dye removal by polypyrrole-modified red mud and its application to a lab-scale column: adsorption performance and phytotoxicity assessment
publisher	Hindawi - SAGE Publishing
publishDate	2021
url	https://doaj.org/article/38a596287ff44e97b79409b5f3b130be
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Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

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