Chemical and biological immobilization mechanisms of potentially toxic elements in biochar-amended soils
journal contributionposted on 07.01.2021, 03:29 by Tharanga Dissanayaka Mudiyanselage, Ashley Franks, Jianming Xu, N Bolan, H Wang, Caixian Tang
© 2019 Taylor & Francis Group, LLC.
The application of biochars for the remediation of water and soils contaminated with potentially toxic elements (PTEs) has seen a recent growing interest. The mechanisms of chemical immobilization of PTEs with biochars in aqueous media have been well defined. However, immobilization mechanisms by which biochars interact with PTEs in soil matrix are more complex. The biological immobilization mechanisms and their interactions with PTEs in biochar-amended soils are not as well defined. This review presents an overview of factors governing interactions of biochars with PTEs as well as the synergistic effect of biochars and microorganisms in biological immobilization processes. The effectiveness of biochars in improvement of microbial immobilization of PTEs mainly depends on biochar properties, application rates, and soil environments such as organic matter content, clay type and content, pH and redox potential. Although some modified biochars appear to be better than the pristine biochars for immobilization of PTEs, their potential adverse impacts on soil microbial activity should be considered. This review highlights the most common analytical methods to discover molecular interaction mechanisms between biochar and PTEs and future research areas required for the understanding of biochar-PTE interactions in polluted soil systems.
JMX was financially supported by the National Natural Science Foundation of China (41520104001).
JournalCritical Reviews in Environmental Science and Technology
Pagination76p. (p. 903-978)
PublisherTaylor & Francis
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Science & TechnologyLife Sciences & BiomedicineEnvironmental SciencesEnvironmental Sciences & EcologyBiocharpotentially toxic elementschemical mechanismsmicrobesadvance techniquesmodificationpriming effectDIFFERENT PYROLYSIS TEMPERATURESMICROBIAL COMMUNITY ABUNDANCECD-CONTAMINATED SOILHEAVY-METAL BIOAVAILABILITYMANURE-DERIVED HYDROCHARSAQUEOUS-SOLUTIONRICE-STRAWCARBON MINERALIZATIONACTIVATED CARBONORGANIC-CARBON