Research Progress in Application of Biochar-supported Sulfidized Nanoscale Iron Composites to Environmental Remediation
Nanoscale zero valent iron(nZVI),regarded as an excellent material for remediation of contaminated soil and water bodies,can be used for the in-situ remediation of various pollutants;however,the drawbacks of easy aggregation and oxidation of nZVI considerably reduce its remediation performance.Biochar,having a high specific surface area,stable porous structure,and numerous surface active sites,is an effective carrier for dispersing nZVI particles;besides,sulfuration modifica-tion can effectively alleviate the agglomeration of nZVI particles and inhibit the oxidation of nZVI particles.Therefore,biochar-supported sulfurized nano-zero valent iron(S-nZVI@BC)composite is able to effectively improve the dispersion and stability of nZVI particles,and characterized with alleviating surface oxidation of nZVI,improving the electronic conduc-tivity of nZVI,and controlling the corrosion rate of nZVI,which can improve pollutants removal rate and enable nZVI to be stronger in terms of reactivity and target pollutant selectivity.This paper is dedicated to summarize in detail the preparation method and characterization technology of S-nZVI@BC),introducing the latest progress in the removal of heavy metals and organic pollutants by S-nZVI@BC.In addition,the influence of environmental factors on their remediation performance is discussed,the remediation mechanism of S-nZVI@BC for pollutant is explored;in the end,suggestions for improving remediation performance of S-nZVI@BC are proposed,which is aimed to offer theoretical guidance for the application of S-nZVI@BC in environmental remediation.
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维普
