Pedosphere 27(6): 991--1014, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Use of Biochar as an Amendment for Remediation of Heavy Metal-Contaminated Soils:Prospects and Challenges
Altaf Hussain LAHORI1, GUO Zhanyu1, ZHANG Zengqiang1, LI Ronghua1, Amanullah MAHAR2, Mukesh Kumar AWASTHI1,3, SHEN Feng1, Tanveer Ali SIAL1, Farhana KUMBHAR4, WANG Ping1, JIANG Shuncheng1
1College of Natural Resources and Environment, Northwest A&F University, Yangling 712100 (China)
2Centre for Environmental Sciences, University of Sindh, Jamshoro 76080 (Pakistan)
3Department of Biotechnology, Amicable Knowledge Solution University, Satna 485001 (India)
4College of Agronomy, Northwest A&F University, Yangling 712100 (China)
ABSTRACT
      Biochar (BC), known as the new black gold, is a stable, novel carbonaceous by-product that is synthesized through pyrolysis of biological materials in the absence of O2. Recently, an emerging interest in the application of BC as a robust soil amendment has given rise to a broad research area in science and technology. It is considered a promising remediation option for heavy metal (HM)-contaminated soils to reduce HM bioavailability to plants. Remediation efficacy of BC depends on the porosity, composition, pyrolysis temperature, feedstock, and residence time of pyrolysis. This review article aimed to present an overview of BC use in the immobilization of HMs, i.e., Cd, As, Pb, Zn, Ni, Cu, Mn, Cr, and Sb, in contaminated soils. The remaining uncertain factors, including the specific soil HM immobilization mechanisms, long-term beneficial effects, and potential environmental risks associated with BC application are analyzed. Future research must be conducted to ensure that the management of environmental pollution is in accord with ecological sustainability and adaptation of the black gold biotechnology on a commercial basis for immobilization of HMs in contaminated soils.
Key Words:  additives, environmental pollution, feedstock, immobilization, pyrolysis temperature, remediation efficacy
Citation: Lahori A H, Guo Z Y, Zhang Z Q, Li R H, Mahar A, Awasthi M K, Shen F, Sial T A, Kumbhar F, Wang P, Jiang S C. 2017. Use of biochar as an amendment for remediation of heavy metal-contaminated soils: Prospects and challenges. Pedosphere. 27(6): 991–1014.
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