Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil

Cadmium (Cd) and lead (Pb) carry a high heavy-metal-toxic risk for both animals and plants in soil. In this study, iron-based biochar (T-BC) was prepared by co-pyrolysis using wastes of iron tailings and biomass with urea as the functioning agents. Field-emission scanning electron microscopy (SEM),...

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Autores principales:	Yang Zhou, Lili Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	solid waste soil contamination biochar <i>Brassica campestris</i> L. Cd Pb Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/9c21b789d6d7426d9b8480fdb6cdb9b4
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spelling	oai:doaj.org-article:9c21b789d6d7426d9b8480fdb6cdb9b42021-11-25T18:49:54ZEffect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil10.3390/pr91118662227-9717https://doaj.org/article/9c21b789d6d7426d9b8480fdb6cdb9b42021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1866https://doaj.org/toc/2227-9717Cadmium (Cd) and lead (Pb) carry a high heavy-metal-toxic risk for both animals and plants in soil. In this study, iron-based biochar (T-BC) was prepared by co-pyrolysis using wastes of iron tailings and biomass with urea as the functioning agents. Field-emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and toxicity-characteristic leaching procedure (TCLP) methods were employed to analyze the physicochemical characteristics of T-BC. Additionally, a pot trial was conducted to examine the effects of T-BC on the physiological characteristics of pak choi (<i>Brassica campestris</i> L.), the availability of heavy metals, and enzyme activities in the soils. The results show that toxic metals have been volatilized by the roasting process and immobilized within T-BC via the formation of stable metal-compounds during the co-pyrolysis process, which satisfies the requirements of a soil passivator. Incubation experiments showed that the DTPA-extractable Cd and Pb in contaminated soils decreased with an increasing amendment rate. Moreover, in the pot experiments, by adding 1% (<i>w/w</i>) T-BC into soils, the soils benefited from its large adsorption, complex precipitation, and immobilization capacity. Approximately 36% Cd and 29% Pb concentrations of edible parts in pak choi were reduced. The amendment proved promising for the stabilization of Cd and Pb in contaminated soils, while providing a strategy for solving the residual waste of tailings and biomass.Yang ZhouLili LiMDPI AGarticlesolid wastesoil contaminationbiochar<i>Brassica campestris</i> L.CdPbChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1866, p 1866 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	solid waste soil contamination biochar <i>Brassica campestris</i> L. Cd Pb Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	solid waste soil contamination biochar <i>Brassica campestris</i> L. Cd Pb Chemical technology TP1-1185 Chemistry QD1-999 Yang Zhou Lili Li Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
description	Cadmium (Cd) and lead (Pb) carry a high heavy-metal-toxic risk for both animals and plants in soil. In this study, iron-based biochar (T-BC) was prepared by co-pyrolysis using wastes of iron tailings and biomass with urea as the functioning agents. Field-emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and toxicity-characteristic leaching procedure (TCLP) methods were employed to analyze the physicochemical characteristics of T-BC. Additionally, a pot trial was conducted to examine the effects of T-BC on the physiological characteristics of pak choi (<i>Brassica campestris</i> L.), the availability of heavy metals, and enzyme activities in the soils. The results show that toxic metals have been volatilized by the roasting process and immobilized within T-BC via the formation of stable metal-compounds during the co-pyrolysis process, which satisfies the requirements of a soil passivator. Incubation experiments showed that the DTPA-extractable Cd and Pb in contaminated soils decreased with an increasing amendment rate. Moreover, in the pot experiments, by adding 1% (<i>w/w</i>) T-BC into soils, the soils benefited from its large adsorption, complex precipitation, and immobilization capacity. Approximately 36% Cd and 29% Pb concentrations of edible parts in pak choi were reduced. The amendment proved promising for the stabilization of Cd and Pb in contaminated soils, while providing a strategy for solving the residual waste of tailings and biomass.
format	article
author	Yang Zhou Lili Li
author_facet	Yang Zhou Lili Li
author_sort	Yang Zhou
title	Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
title_short	Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
title_full	Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
title_fullStr	Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
title_full_unstemmed	Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil
title_sort	effect of a passivator synthesized by wastes of iron tailings and biomass on the leachability of cd/pb and safety of pak choi (<i>brassica chinensis</i> l.) in contaminated soil
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9c21b789d6d7426d9b8480fdb6cdb9b4
work_keys_str_mv	AT yangzhou effectofapassivatorsynthesizedbywastesofirontailingsandbiomassontheleachabilityofcdpbandsafetyofpakchoiibrassicachinensisilincontaminatedsoil AT lilili effectofapassivatorsynthesizedbywastesofirontailingsandbiomassontheleachabilityofcdpbandsafetyofpakchoiibrassicachinensisilincontaminatedsoil
_version_	1718410662977208320

Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (<i>Brassica chinensis</i> L.) in Contaminated Soil

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