数字农科院2.0

Intentional reduction-induced asymmetric charge strategy for efficient γ-Hexachlorocyclohexane mineralization: Establishing reduction-oxidation-relay catalysis process

文献类型： 外文期刊

作者： Peng Huang;Le Jiao;Peng Zhang;Snežana Maletić;Hongwen Sun

作者机构：

关键词： Mineralization mechanism;Nano zero valent iron;Persulfate;Reduction-oxidation-relay catalysis;γ-Hexachlorocyclohexane

期刊名称： Applied Catalysis B: Environmental

ISSN： 0926-3373

年卷期： 2025 年 382 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Herein, a reduction-oxidation-relay catalysis (ROC) strategy based on intentional induced asymmetric charge was developed to efficient advanced mineralization of γ-Hexachlorocyclohexane (γ-HCH). In the optimized ROC system, the degradation and mineralization rates of γ-HCH reached 0.388 h−1 and 0.259 h−1, respectively, representing enhancements of 10.8- and 7.8-fold over oxidation alone. Density functional theory revealed that intentional reductive dechlorination creates asymmetric charge distribution in γ-HCH, significantly lowering the degradation energy barrier. This facilitates free radicals efficiently attack the reduction products during the oxidation stage, ultimately promoting γ-HCH mineralization. The additional active Fe2+ species and enhanced Fe0 electron selectivity in ROC system improved the oxidative efficiency of radicals toward γ-HCH intermediates in the post-oxidation stage. Additionally, more than 99.6 % of γ-HCH in water-soil systems was degraded by the ROC process within 10 days. This study provides new insights for the remediation of chlorinated organic compounds contamination in real scenarios.

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