疏水性腐植酸酯醚的制备及其对草枯醚农药水污染的修复机制
发布时间：2019-01-07 17:36
【摘要】：草枯醚作为一种二苯醚类除草剂,曾在20世纪70~90年代大量使用,是一种典型的持久性有机污染物.禁用20年来,其在水、土壤环境中仍有检出,严重威胁农业生态安全.实验采用缩水甘油醚对前期制备的腐植酸酯(HAE)进行化学改性,调控合成强疏水性的腐植酸酯醚(HAEE)吸附材料,用于水中草枯醚吸附去除.通过傅里叶红外光谱表征、疏水角测定,可以表明HAEE不仅保留了芳香核和类酯结构,同时疏水角由改性前的30°提高到96°.此外,通过HAEE对水中草枯醚的吸附行为,探究HAEE对水中草枯醚农药污染的修复机制,结果表明:HAEE对草枯醚的吸附量随疏水性的增强而增大;吸附在2.0h即达平衡;并符合Lagergren二级动力学方程;吸附等温线契合Freundlich模型;HAEE经5次再生后,对草枯醚的去除率仍在78%以上.HAEE对草枯醚的吸附机制以疏水分配和π-π作用为主.实验制备的疏水性HAEE对草枯醚的吸附,可为水、土壤环境中草枯醚的污染修复提供理论依据.
[Abstract]:As a diphenyl ether herbicide, grass withered ether was widely used in the 1970s and 1990s. It is a typical persistent organic pollutant. In the past 20 years, it has been detected in water and soil environment, which is a serious threat to agricultural ecological security. Glycidyl ether (glycidyl ether) was used to chemically modify the humic acid ester (HAE) prepared in the early stage, and to control the synthesis of strong hydrophobic humic acid ester ether (HAEE) adsorption material for the adsorption and removal of grass withered ether in water. Fourier transform infrared spectroscopy (FTIR) analysis and hydrophobic angle measurement showed that HAEE not only retained aromatic nuclei and ester like structures, but also increased the hydrophobic angle from 30 掳to 96 掳. In addition, through the adsorption behavior of HAEE to grass withered ether in water, the mechanism of HAEE remediation of grass withered ether pesticide pollution in water was explored. The results showed that the adsorption capacity of HAEE on grass withered ether increased with the increase of hydrophobicity, and reached equilibrium at 2.0 h. The adsorption isotherm fits the Freundlich model, and the removal rate of HAEE is still over 78% after five regeneration. The adsorption mechanism of HAEE on grass withered ether is mainly hydrophobic partitioning and 蟺-蟺 interaction. The hydrophobic HAEE prepared in the experiment can provide theoretical basis for the remediation of grass withered ether pollution in water and soil environment.
【作者单位】： 四川师范大学化学与材料科学学院;
【基金】：国家自然科学基金(51641209)
【分类号】：X592
，
本文编号：2403939
[Abstract]:As a diphenyl ether herbicide, grass withered ether was widely used in the 1970s and 1990s. It is a typical persistent organic pollutant. In the past 20 years, it has been detected in water and soil environment, which is a serious threat to agricultural ecological security. Glycidyl ether (glycidyl ether) was used to chemically modify the humic acid ester (HAE) prepared in the early stage, and to control the synthesis of strong hydrophobic humic acid ester ether (HAEE) adsorption material for the adsorption and removal of grass withered ether in water. Fourier transform infrared spectroscopy (FTIR) analysis and hydrophobic angle measurement showed that HAEE not only retained aromatic nuclei and ester like structures, but also increased the hydrophobic angle from 30 掳to 96 掳. In addition, through the adsorption behavior of HAEE to grass withered ether in water, the mechanism of HAEE remediation of grass withered ether pesticide pollution in water was explored. The results showed that the adsorption capacity of HAEE on grass withered ether increased with the increase of hydrophobicity, and reached equilibrium at 2.0 h. The adsorption isotherm fits the Freundlich model, and the removal rate of HAEE is still over 78% after five regeneration. The adsorption mechanism of HAEE on grass withered ether is mainly hydrophobic partitioning and 蟺-蟺 interaction. The hydrophobic HAEE prepared in the experiment can provide theoretical basis for the remediation of grass withered ether pollution in water and soil environment.
【作者单位】： 四川师范大学化学与材料科学学院;
【基金】：国家自然科学基金(51641209)
【分类号】：X592
，
本文编号：2403939
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