Green remediation of benzene contaminated groundwater using persulfate activated by biochar composite loaded with iron sulfide minerals
CHEMICAL ENGINEERING JOURNAL(2022)
摘要
In this study, biochar supported iron sulfide (FexSy) composite (FexSy@biochar) was synthesized and utilized as a persulfate (PS) activator for benzene removal from contaminated groundwater. The FexSy@biochar/PS system exhibited excellent performance in benzene adsorption and subsequent degradation. The optimal conditions for benzene removal in this study were found to be 1 g L-1 FexSy@biochar dosage and 3 mM PS concentration (removal rate 99.8%), with no reversible desorption of benzene concentrations in a long-time interval. The high catalytic performance of FexSy@biochar was mainly attributed to the free radicals (i.e., SO4.-,.OH) generated from PS activation induced by FexSy particles on biochar, followed by the possible activation by oxygencontaining groups. The as-prepared FexSy@biochar also showed long-term effectiveness for PS activation as confirmed by the 4 test cycled tests. The EPR not only demonstrated the presence of .OH and SO4.- free radicals but also indicated the sustainable release effect of reactive species from FexSy@biochar/PS system, as strong signals were observed in the FexSy@biochar/PS system even after 24 h. The FexSy@biochar could be an alternative to existing activators of in-situ chemical oxidation for contaminated groundwater remediation.
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关键词
FexSy nanoparticles, Engineered biochar, Sulfate radicals, Groundwater contamination, Benzene degradation, Sustainable remediation
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