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改性生物质材料对地表水中残余草甘膦异丙胺盐的吸附

Adsorption of Residual Pesticide Glyphosate Isopropylamine in Surface Water byModified Biomass Materials
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摘要 有效处理农药残留引起的水环境污染问题是提升河湖水质的关键.采用浸渍法将Fe和Al双金属复合至花生壳粉末,成功制备改性生物质材料(Fe-Al-PS),用于吸附水环境中残留的草甘膦异丙胺盐除草剂.Fe-Al-PS对10 mg·L^(-1)的草甘膦异丙胺盐在吸附剂用量和吸附时间分别为0.14 g和10 min时达到吸附平衡,去除率分别稳定在99.9%和99.6%.吸附过程遵循伪二级动力学和Freundlich吸附等温模型,属于多分子层化学吸附.Fe-Al-PS在较宽的p H(2~11)范围内对草甘膦异丙胺盐的去除率均大于95%.热力学结果表明吸附是自发的放热过程.Fe-Al-PS材料易得、合成简便且能耗低,具有较高的抗干扰能力和可重复利用性,不仅可用于实际水体中草甘膦异丙胺盐除草剂的有效去除,还可用于无机磷的去除. Effective treatment of pesticide residue-induced pollution in the aqueous environment is the key to improving the water quality of rivers and lakes.Modified biomass material(Fe-Al-PS)was successfully prepared by impregnating Fe and Al bimetallic compounds to peanut shell powder for adsorption of glyphosate isopropylamine salt herbicide residues in aqueous environments.Fe-Al-PS reached adsorption equilibrium for 10 mg·L^(-1) of glyphosate isopropylamine salt at the adsorbent dosage and adsorption time of 0.14 g and 10 min,respectively,and the removal rates were stabilized at 99.9%and 99.6%,respectively.The adsorption process followed the pseudo-secondary kinetic and Freundlich adsorption isotherm models and belonged to multi-molecular layer chemisorption.The removal of glyphosate isopropylamine salt by Fe-Al-PS was greater than 95%in a wide range of pH(2-11).The thermodynamic results indicated that the adsorption was a spontaneous exothermic process.Fe-Al-PS materials were easy to access and involved simple synthesis and low energy consumption,had high anti-interference ability,were reusable,and could be used not only for the effective removal of glyphosate isopropylamine salt herbicide in real water bodies but also for the removal of inorganic phosphorus.
作者 周玥 李艳 王晓东 王慧 薛冰纯 ZHOU Yue;LI Yan;WANG Xiao-dong;WANG Hui;XUE Bing-chun(College of Chemistry and Materials Science,Shanxi Normal University,Taiyuan 030031,China)
出处 《环境科学》 EI CAS CSCD 北大核心 2024年第6期3234-3246,共13页 Environmental Science
基金 水资源协同创新中心项目(0401/01050001)。
关键词 生物质 浸渍法 草甘膦异丙胺盐(GIS) 掺杂改性 吸附 水质处理 biomass impregnation method glyphosate isopropylamine salt(GIS) doping vario-property adsorption water quality treatment
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