武汉工程大学学报2026，Vol.48Issue(3)：253-260,8.DOI:10.19843/j.cnki.CN42-1779/TQ.202510005
相对湿度对铁锰氧化物表面甲基对硫磷降解行为的影响
Effect of relative humidity on the degradation behavior of methyl parathion on the surface of iron-manganese oxides
摘要
Abstract
The pollution of soil by organophosphorus pesticides(OPPs)has attracted widespread attention from researchers.Exploring the environmental behaviors of OPPs on the surface of soil iron-manganese oxides is crucial for clarifying the environmental fate of such pollutants.The degradation behaviors of methyl parathion(MP)by seven iron and manganese oxides with different crystal forms were investigated under limited moisture conditions.Results showed that MP mainly underwent hydrolysis on the surface of iron oxides and iron-manganese oxides,while both hydrolysis and oxidation reactions occurred simultaneously on the surface of manganese oxides.When the relative humidity(RH)was in the range of 33%-76%,the hydrolysis rate of MP by iron oxides reached the maximum(1.37×10-2 h-1).For manganese oxides,there was a significant negative correlation between the observed degradation rate(Kobs)of MP and RH.As RH increased from 5%to 100%,the Kobs value decreased from 0.66 h-1 to 0.31 h-1.In addition,the degradation rate of MP by α-MnO2(0.276 h-1·m-2)was 2～3 orders of magnitude higher than that of goethite(0.010 6 h-1·m-2)and iron-manganese oxides(0.004 03 h-1·m-2).The hydrolysis of MP by iron oxides and manganese oxides was jointly controlled by surface hydroxyl groups and Lewis acid sites,while the hydrolysis by the iron-manganese oxide was governed exclusively by the surface Lewis acid sites.The findings of this study underscore the impact of limited moisture conditions on the catalytic transformation of OPPs by iron and manganese oxides,and also reveal the likely long-overlooked abiotic transformation behavior of such pollutants in the soil environment.关键词
铁锰氧化物/甲基对硫磷/相对湿度/降解行为Key words
iron manganese oxide/methyl parathion/relative humidity/degradation behavior分类
资源环境引用本文复制引用
彭美淋,雷蒙,郑菲,胡立嵩,董万强,廖小平..相对湿度对铁锰氧化物表面甲基对硫磷降解行为的影响[J].武汉工程大学学报,2026,48(3):253-260,8.基金项目
国家自然科学基金(41702267) （41702267）
武汉工程大学科学基金(K201935) （K201935）
武汉工程大学研究生教育创新基金(CX2022423) （CX2022423）
