Remediation of cadmium and lead polluted soil using thiol-modified biochar.

Autor: Fan J; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Chemical Engineering, Huaqiao University, Xiamen 361021, China., Cai C; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China., Chi H; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China., Reid BJ; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; School of Environmental Sciences, University of East Anglia, Norwich NR47TJ, UK., Coulon F; School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK., Zhang Y; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: yczhang@iue.ac.cn., Hou Y; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Chemical Engineering, Huaqiao University, Xiamen 361021, China. Electronic address: houyw@hqu.edu.cn.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2020 Apr 15; Vol. 388, pp. 122037. Date of Electronic Publication: 2020 Jan 07.
DOI: 10.1016/j.jhazmat.2020.122037
Abstrakt: Thiol-modified rice straw biochar (RS) was prepared by an esterification reaction with β-mercaptoethanol and used for the remediation of Cd and Pb polluted soils. Modified biochar was characterized through elemental analysis, BET analysis, FE-SEM, FT-IR and XPS. These analytical results revealed that thiol groups were successfully grafted onto the surface of the biochar and were involved in metal ion complexation. Batch sorption experiments indicated that Cd 2+ and Pb 2+ sorption onto RS described well by a pseudo second order kinetic model and a Langmuir isotherm. The maximum adsorption capacities for Cd 2+ and Pb 2+ , in the single-metal systems, were 45.1 and 61.4 mg g -1 , respectively. In the binary-metal systems, RS selectively adsorbed Cd 2+ over Pb 2+ . Cd 2+ and Pb 2+ were removed mainly through surface complexation. In the soil incubation experiments (28 days), RS reduced the available Cd by 34.8-39.2 %; while, RS reduced the available Pb by 8.6 %-11.1 %. This research demonstrates RS as a potentially effective amendment for the remediation of heavy metal polluted soils.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: