Phenol driven changes onto MnO(2) surface for efficient removal of methyl parathion: The role of adsorption.
Phenol driven changes onto MnO(2) surface for efficient removal of methyl parathion: The role of adsorption.
复制标题
苯酚驱动的 MnO(2) 表面变化可有效去除甲基对硫磷：吸附的作用。
DOI：
10.1016/j.chemosphere.2020.128695
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Hu Lisong
中科院分区：
文献类型：
--
作者：
Liao Xiaoping;Zhang Caixiang;Nan Chao;Lv You;Fan Zenghui;Hu Lisong
锰氧化物（MnO 2）是重要的环境氧化物，在具有供电子功能团（如-OH）的微有害有机污染物的解毒等领域引起了人们的极大关注。然而，这些氧化过程是否可能进一步影响一些酯类如有机磷农药（OPPs）的命运的研究仍然知之甚少。在此，我们提出了一个新的机制，涉及在MnO 2和苯酚的混合物中的甲基溴离子的增强去除。具体而言，去除甲基二价离子（高达73.7%）是显着高于一个二元系统比单独的二氧化锰（约9.3%），主要是由于吸附，而不是降解。甲基溴离子的吸附程度与pH值、反应物负载量和金属离子共溶质（如Ca ~（2+）、Mg ~（2+）、Fe ~（3+）和Mn ~（2+））有关。光谱（FT-IR、SEM-EDX和XPS）和色谱（LC/HRMS）分析都表明，有机物（例如，MnO_2表面的吸附主要通过氢键、n-π和π-π相互作用、货车范德华力和孔扩散进行。研究结果为锰氧化物在土壤-水环境中吸附甲基对硫磷的作用提供了证据。
Manganese oxides (MnO2), important environmental oxides, have drawn significant attention in areas such as detoxification of micro-hazardous organic contaminants with electron-donating functional groups such as –OH. However, studies on whether these oxidized processes might further impact the fate of some esters like organophosphorus pesticide (OPPs) remain poorly understood. Herein, we propose a new mechanism involved in the enhanced removal of methyl parathion in mixtures of MnO2and phenol. Specifically, the removal of methyl parathion (up to 73.7%) was significantly higher for a binary system than for MnO2alone (approximately 9.3%) and was primarily due to adsorption rather than degradation. The extent of methyl parathion adsorption was dependent significantly on pH, reactant loading and metal ion co-solutes (such as Ca2+, Mg2+, Fe3+and Mn2+). Both spectroscopic (FT-IR, SEM-EDX and XPS) and chromatographic (LC/HRMS) analyses showed that the remarkable increase in the number of organics (e.g., polymers) onto the MnO2surface dominated methyl parathion adsorption via hydrogen bonding, n-π and π-π interactions, van der Waals forces and pore-diffusion. The results from this study provided evidence for the role of manganese oxides in adsorption of methyl parathion in soil-aquatic environments involving phenolic compounds.