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通过吸附和共沉淀两种方式制备具有不同C/Fe物质的量比(0～1.4)的铁氧化物-土壤有机质复合物(FhAx和FhCx),用于高效活化过氧化氢(H_2O2)降解对硝基苯酚(PNP)。研究表明，FhA和FhC均可促进PNP的类芬顿降解，且相同C/Fe比条件下，FhC相比于FhA具有更高催化活性。PNP的降解符合准一级动力学，FhC0.2具有更高的催化活性，其降解速率常数(0.013 7 min-1)分别是Fh/H_2O2、FhA0.2/H_2O2、FhA0.8/H_2O2、FhA1.4/H_2O2、FhC0.8/H_2O2和FhC1.4/H_2O2体系的2.1、1.4、3.0、2.7、1.4和1.2倍。FhC0.2/H_2O2体系PNP降解的最优pH为3,与pH为4、5和7的体系相比，其降解速率常数分别提高了27.4、45.6和68.5倍。4次循环实验后，FhC0.2降解率仍接近80%,反应前X射线衍射谱图发现材料未发生明显变化，说明其具有较高的结构稳定性。淬灭实验表明，FhC0.2活化H_2O2体系中产生的主要活性氧物种是羟基自由基(·OH)。研究结果有望揭示Fe-C复合材料的作用形式在类芬顿降解有机污染物过程的影响，并为其主要催化机制提供新的见解。
Abstract：In this study, iron oxide-soil organic complexes prepared via adsorption(FhAx, x represents C/Fe molar ratio) and coprecipitation(FhCx) with different C/Fe molar ratios(0-1.4) were synthesized and used as catalysts for H_2O2 activation and p-nitrophenol(PNP) degradation. Both FhA and FhC could promote the Fenton-like degradation of PNP, and FhC exhibited higher catalytic activity than FhA under the same C/Fe molar ratios. The degradation of PNP followed pseudo-first-order kinetics. The rate constant of PNP degradation of FhC0.2/H_2O2 system(0.013 7 min-1) was 2.1, 1.4, 3.0, 2.7, 1.4 and 1.2 folds higher of Fh/H_2O2, FhA0.2/H_2O2, FhA0.8/H_2O2, FhA1.4/H_2O2, FhC0.8/H_2O2 and FhC1.4/H_2O2, respectively. The optimal pH for PNP degradation in the FhC0.2/H_2O2 system was 3, and the degradation rate constant of PNP degradation at pH 3 was 27.4, 45.6, and 68.5 times higher than those at pH 4, 5, and 7, respectively. After 4 cycles, FhC0.2 maintained nearly 80% degradation efficiency, and XRD patterns showed no significant change, indicating high structural stability.Quenching experiment demonstrated that hydroxyl radical(~.OH) was the main reactive oxygen species during the Fenton-like degradation of PNP mediated by FhC0.2. This study revealed the effects of the forms(adsorption vs. coprecipitation) of Fe-C complexes on the Fenton-like degradation of organic pollutants and provided new insights into the main catalytic mechanisms mediated by Fe-C complexes.
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基本信息:
DOI：10.13291/j.cnki.djdxac.2026.03.014
中图分类号:TQ426;O647.3;X53
引用信息:
[1]于华莉,郭子康,梁金辉,等.铁氧化物吸附/共沉淀土壤有机质类芬顿降解对硝基苯酚[J].大连交通大学学报,2026,47(03):119-126.DOI:10.13291/j.cnki.djdxac.2026.03.014.
基金信息:
国家自然科学基金项目(42577020、42207288)
2026-06-09
2026-06-09
2026-06-09