Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease

The development and application of nano-biochar synthesized by ball milling technology is still challenging in the field of environmental remediation because of its higher activity with pollutants. The purpose of this study was to investigate the transport behavior of two kinds of biochar nanopartic...

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Autores principales:	Shi Zhou, Xue Ni, Houlang Zhou, Xiangmin Meng, Huimin Sun, Jun Wang, Xianqiang Yin
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Transport Biochar nanoparticles nZVI Cd2+ Coated sand Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/b041138afb194ebd89a63e8b4f287ed3
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id	oai:doaj.org-article:b041138afb194ebd89a63e8b4f287ed3
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spelling	oai:doaj.org-article:b041138afb194ebd89a63e8b4f287ed32021-11-14T04:28:21ZEffect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease0147-651310.1016/j.ecoenv.2021.112971https://doaj.org/article/b041138afb194ebd89a63e8b4f287ed32021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321010836https://doaj.org/toc/0147-6513The development and application of nano-biochar synthesized by ball milling technology is still challenging in the field of environmental remediation because of its higher activity with pollutants. The purpose of this study was to investigate the transport behavior of two kinds of biochar nanoparticles (nanobiochar (NBC) and nZVI-modified nanobiochar (nZVI-NBC)) and Cd2+ in clay mineral (kaolinite, illite, and montmorillonite)-coated quartz sand columns. The interaction between biochar nanoparticles and Cd2+ in saturated porous media was studied in cotransport experiments. Then, the effect of biochar nanoparticles on the release of Cd2+ in contaminated media was explored by elution experiments. The cotransport experiments showed that the mobility of Cd2+ was enhanced by two kinds of biochar nanoparticles, while the transport of biochar was limited due to the presence of Cd2+. The elution experiments showed that the transport of biochar nanoparticles can be inhibited by Cd2+ previously immobilized in the sand column, and Cd2+ can be rereleased by biochar nanoparticles. The rerelease ability of nZVI-NBC to Cd2+ is weaker than that of NBC because nZVI is more easily retained in the sand column after oxidation, thus strengthening the immobilization of Cd2+. In general, the recoveries of NBC, nZVI-NBC and Cd2+ in saturated porous media were reduced by the presence of clay minerals. The experimental results describing the stability of biochar nanoparticles in sand columns are consistent with those predicted by the Derjaguin-Landau-Verwey-Overbeek theory. The transport behavior of Cd2+ and biochar nanoparticles in sand columns can be well simulated by advection-dispersion-reaction. These findings reveal the interaction between biochar nanoparticles and heavy metals in the soil environment and provide new insights into the transport and fate of environmental remediation materials and pollutants in the underground environment.Shi ZhouXue NiHoulang ZhouXiangmin MengHuimin SunJun WangXianqiang YinElsevierarticleTransportBiochar nanoparticlesnZVICd2+Coated sandEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 228, Iss , Pp 112971- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Transport Biochar nanoparticles nZVI Cd2+ Coated sand Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	Transport Biochar nanoparticles nZVI Cd2+ Coated sand Environmental pollution TD172-193.5 Environmental sciences GE1-350 Shi Zhou Xue Ni Houlang Zhou Xiangmin Meng Huimin Sun Jun Wang Xianqiang Yin Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
description	The development and application of nano-biochar synthesized by ball milling technology is still challenging in the field of environmental remediation because of its higher activity with pollutants. The purpose of this study was to investigate the transport behavior of two kinds of biochar nanoparticles (nanobiochar (NBC) and nZVI-modified nanobiochar (nZVI-NBC)) and Cd2+ in clay mineral (kaolinite, illite, and montmorillonite)-coated quartz sand columns. The interaction between biochar nanoparticles and Cd2+ in saturated porous media was studied in cotransport experiments. Then, the effect of biochar nanoparticles on the release of Cd2+ in contaminated media was explored by elution experiments. The cotransport experiments showed that the mobility of Cd2+ was enhanced by two kinds of biochar nanoparticles, while the transport of biochar was limited due to the presence of Cd2+. The elution experiments showed that the transport of biochar nanoparticles can be inhibited by Cd2+ previously immobilized in the sand column, and Cd2+ can be rereleased by biochar nanoparticles. The rerelease ability of nZVI-NBC to Cd2+ is weaker than that of NBC because nZVI is more easily retained in the sand column after oxidation, thus strengthening the immobilization of Cd2+. In general, the recoveries of NBC, nZVI-NBC and Cd2+ in saturated porous media were reduced by the presence of clay minerals. The experimental results describing the stability of biochar nanoparticles in sand columns are consistent with those predicted by the Derjaguin-Landau-Verwey-Overbeek theory. The transport behavior of Cd2+ and biochar nanoparticles in sand columns can be well simulated by advection-dispersion-reaction. These findings reveal the interaction between biochar nanoparticles and heavy metals in the soil environment and provide new insights into the transport and fate of environmental remediation materials and pollutants in the underground environment.
format	article
author	Shi Zhou Xue Ni Houlang Zhou Xiangmin Meng Huimin Sun Jun Wang Xianqiang Yin
author_facet	Shi Zhou Xue Ni Houlang Zhou Xiangmin Meng Huimin Sun Jun Wang Xianqiang Yin
author_sort	Shi Zhou
title	Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
title_short	Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
title_full	Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
title_fullStr	Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
title_full_unstemmed	Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease
title_sort	effect of nzvi/biochar nanocomposites on cd transport in clay mineral-coated quartz sand: facilitation and rerelease
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/b041138afb194ebd89a63e8b4f287ed3
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Effect of nZVI/biochar nanocomposites on Cd transport in clay mineral-coated quartz sand: Facilitation and rerelease

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