Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism

Nanoscale zero-valent iron (nZVI) and sulfides have been confirmed to be effective in arsenic sequestration from aqueous solution. In this study, attapulgite supported and sulfide-modified nanoscale zero-valent iron (S-nZVI@ATP) are synthesized to realize the superposition effect of enhanced arsenic...

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Autores principales:	Shun Cheng, Hong Liu, Emmanuella Anang, Chunxia Li, Xianyuan Fan
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	as(iii) sequestration attapulgite nanoscale zero-valent iron removal mechanism sulfidation Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/93b6e4fd2854481fb915b18a9148e550
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spelling	oai:doaj.org-article:93b6e4fd2854481fb915b18a9148e5502021-11-06T11:09:37ZEnhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism0273-12231996-973210.2166/wst.2021.184https://doaj.org/article/93b6e4fd2854481fb915b18a9148e5502021-06-01T00:00:00Zhttp://wst.iwaponline.com/content/83/12/2886https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Nanoscale zero-valent iron (nZVI) and sulfides have been confirmed to be effective in arsenic sequestration from aqueous solution. In this study, attapulgite supported and sulfide-modified nanoscale zero-valent iron (S-nZVI@ATP) are synthesized to realize the superposition effect of enhanced arsenic sequestration. The results indicated that nZVI clusters were well disaggregated and the BET specific surface area increased from 19.61 m2·g−1 to 46.04 m2·g−1 of S-nZVI@ATP, resulting in an enhanced removal efficiency of arsenic from 51.4% to 65.1% at 20 min. The sulfides in S-nZVI@ATP mainly exist as mackinawite (FeS) and this causes the spherical nanoparticles to exhibit a larger average particle size (94.6 nm) compared to bare nZVI (66.0 nm). In addition, S-nZVI@ATP exhibited a prominent ability for arsenic sequestration over a wide pH range of 3.0–6.0. The presence of anions SO42− and Cl− can enhance the arsenic removal whereas HCO3− inhibited it. The arsenic adsorption by S-nZVI@ATP could be explained by the pseudo-second-order kinetic model and the Langmuir model, with the maximum adsorption capacity of 193.8 mg·g−1. The mechanism of As(III) sequestration by S-nZVI@ATP involved multiple processes, mainly including precipitation conversion from FeS to As2S3, surface-complexation adsorption and co-precipitation. HIGHLIGHTS S-nZVI@ATP was synthesized to superimpose the performance of nZVI and sulfides on arsenic removal.; The distribution of sulfides in S-nZVI@ATP and its role for As(III) removal were investigated.; S-nZVI@ATP showed an enlarged specific surface area and an enhanced arsenic removal efficiency.; The maximum adsorption capacity for arsenic was 193.8 mg·g−1.; The mechanism involved the combined action of Fe(0) core and sulfide shell.;Shun ChengHong LiuEmmanuella AnangChunxia LiXianyuan FanIWA Publishingarticleas(iii) sequestrationattapulgitenanoscale zero-valent ironremoval mechanismsulfidationEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 12, Pp 2886-2900 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	as(iii) sequestration attapulgite nanoscale zero-valent iron removal mechanism sulfidation Environmental technology. Sanitary engineering TD1-1066
spellingShingle	as(iii) sequestration attapulgite nanoscale zero-valent iron removal mechanism sulfidation Environmental technology. Sanitary engineering TD1-1066 Shun Cheng Hong Liu Emmanuella Anang Chunxia Li Xianyuan Fan Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
description	Nanoscale zero-valent iron (nZVI) and sulfides have been confirmed to be effective in arsenic sequestration from aqueous solution. In this study, attapulgite supported and sulfide-modified nanoscale zero-valent iron (S-nZVI@ATP) are synthesized to realize the superposition effect of enhanced arsenic sequestration. The results indicated that nZVI clusters were well disaggregated and the BET specific surface area increased from 19.61 m2·g−1 to 46.04 m2·g−1 of S-nZVI@ATP, resulting in an enhanced removal efficiency of arsenic from 51.4% to 65.1% at 20 min. The sulfides in S-nZVI@ATP mainly exist as mackinawite (FeS) and this causes the spherical nanoparticles to exhibit a larger average particle size (94.6 nm) compared to bare nZVI (66.0 nm). In addition, S-nZVI@ATP exhibited a prominent ability for arsenic sequestration over a wide pH range of 3.0–6.0. The presence of anions SO42− and Cl− can enhance the arsenic removal whereas HCO3− inhibited it. The arsenic adsorption by S-nZVI@ATP could be explained by the pseudo-second-order kinetic model and the Langmuir model, with the maximum adsorption capacity of 193.8 mg·g−1. The mechanism of As(III) sequestration by S-nZVI@ATP involved multiple processes, mainly including precipitation conversion from FeS to As2S3, surface-complexation adsorption and co-precipitation. HIGHLIGHTS S-nZVI@ATP was synthesized to superimpose the performance of nZVI and sulfides on arsenic removal.; The distribution of sulfides in S-nZVI@ATP and its role for As(III) removal were investigated.; S-nZVI@ATP showed an enlarged specific surface area and an enhanced arsenic removal efficiency.; The maximum adsorption capacity for arsenic was 193.8 mg·g−1.; The mechanism involved the combined action of Fe(0) core and sulfide shell.;
format	article
author	Shun Cheng Hong Liu Emmanuella Anang Chunxia Li Xianyuan Fan
author_facet	Shun Cheng Hong Liu Emmanuella Anang Chunxia Li Xianyuan Fan
author_sort	Shun Cheng
title	Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
title_short	Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
title_full	Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
title_fullStr	Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
title_full_unstemmed	Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
title_sort	enhanced as(iii) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/93b6e4fd2854481fb915b18a9148e550
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_version_	1718443746559787008

Enhanced As(III) sequestration using nanoscale zero-valent iron modified by combination of loading and sulfidation: characterizations, performance, kinetics and mechanism

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