首页|Cr-containing wastewater treatment based on Cr self-catalysis:a critical review
Cr-containing wastewater treatment based on Cr self-catalysis:a critical review
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Chromium(Cr),as a transition metal material with multiple redox states,has exhibited the catalysis toward Fenton-like reactions over a wide pH range.Although it is not sensible to add Cr reagents as catalysts due to its toxicity,it is highly promising to remediate Cr-containing wastewater through Cr-initiated advanced oxidation processes(Cr-initiated AOPs),which are clean and low-cost.Moreover,the widely concerned Cr-complexes,considered as obstacles in the remediation process,can be effectively destroyed by AOPs.Cr self-catalysis is defined as Cr species is both substrate and catalyst.However,the full understanding of Cr self-catalysis,including the generation of intermediates Cr(Ⅳ)/Cr(Ⅴ),the synergetic effects with co-existing ions,and the accumulation of toxic Cr(Ⅵ),remains a challenge for the practical application of Cr-initiated AOPs.In this review,relevant researches on Cr self-catalysis during Cr-initiated AOPs are summarized.Specifically,the Cr-Fenton-like reaction,Cr substituted materials,and Cr-sulfite reactions are explored as key mechanisms contributing to Cr self-catalysis.Moreover,Cr transformation processes,including synchronously Cr removal,Cr redox reactions,and Cr(Ⅵ)accumulation,in AOPs-based synergistic systems are systematically analyzed.Detailed approaches for the detection of active species in AOPs-based systems are also presented.The primary objective of this review is to explore the application of AOPs for Cr-containing wastewater remediation based on Cr self-catalysis,and provide fundamental insights and valuable information for future research on Cr-initiated AOPs.
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