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cr-containing wastewater treatment based on cr self-catalysis: a critical review

Frontiers of Environmental Science & Engineering 2024年第1期18卷 1-22页

作者： Manshu Zhao Xinhua Wang Shuguang Wang Mingming Gao School of Environmental Science and Engineering Shandong UniversityQingdao 266237China Shandong Key Laboratory of Environmental Processes and Health Shandong UniversityQingdao 266237China Shandong Key Laboratory of Water Pollution Control and Resource Reuse Shandong UniversityQingdao 266237China Weihai Research Institute of Industrial Technology of Shandong University Weihai 264209China

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.

关键词： Self-catalysis cr-initiated AOPs cr transformation cr intermediates cr-containing wastewater

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