Hydrothermal reduction and phase transformation of Fe(III) minerals induced by rice straw to improve the heterogeneous Fenton degradation of metolachlor

文献类型： 外文期刊

第一作者： Liu, Jingyi

作者： Liu, Jingyi;Zhao, Yu;Cheng, Liulong;Lu, Zhuoye;Liang, Haojie;Wang, Yue;Ni, Zhuobiao;Yu, Guangwei;Zhu, Yanping;Qiu, Rongliang;Zhu, Runliang;Deng, Fangxin;Li, Yaying;Qiu, Rongliang;Zhang, Jing

作者机构：

关键词： Heterogeneous Fenton oxidation; Hydrothermal reduction; Phase transformation; Soil remediation; Fe(III)/Fe(II) redox cycle

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 491 卷

页码：

收录情况： SCI

摘要： Heterogeneous Fenton technology is effective in degrading residual pesticides in soil, but the reduction of Fe(III) in the mineral structure presents a bottleneck. This study combined rice straw with Schwertmannite (Sch), ferrihydrite (Fh), and magnetite (Mag) via a hydrothermal process to obtain iron oxides-hydrothermal carbon composites (Sch@HTC, Fh@HTC, and Mag@HTC). Poor-crystallized Sch and Fh, which were more capable of accepting electrons compared to well-crystallized Mag, exhibited obvious phase transformation to highly active Fe(II)-mineral (humboldtine) via the combination of oxalic acid, an intermediate product, with reduced Fe(II), while Mag was hard to achieve. After hydrothermal treatment, all composites showed enhanced catalytic ac- tivity, which increased with the degree of phase transformation. Especially, Sch@HTC demonstrated the highest catalytic activity, degrading 85 % of metolachlor in soil within 24 hours, 2-10 times faster than the others. Surprisingly, the solid-phase Fe(II) in soil increased slightly after the Fenton reaction. Moreover, the in-situ fluorescence intensity of HO center dot in soil was continuously enhanced, and the effective utilization of H2O2 to HO center dot was improved. These results confirmed that HTC could provide electrons to Fe(III) during the hydrothermal process, facilitating the Fe(III)/Fe(II) redox cycle and sustaining reactive Fe(II), thus overcoming key challenges in heterogeneous Fenton catalysis.

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