低分子量有机酸对赤铁矿吸附二氯喹啉酸的影响及机理

杨丽华; 龚道新; 袁雅洁; 周健; 肖浩

文章摘要

杨丽华,龚道新,袁雅洁,周健,肖浩.低分子量有机酸对赤铁矿吸附二氯喹啉酸的影响及机理[J].农业环境科学学报,2015,34(7):1301-1310.

低分子量有机酸对赤铁矿吸附二氯喹啉酸的影响及机理

Effects of Low-Molecular-Weight Organic Acids on Adsorption of Quinclorac by Hematite

投稿时间：2015-01-21

DOI：10.11654/jaes.2015.07.011

中文关键词: 低分子量有机酸赤铁矿二氯喹啉酸吸附机理

英文关键词: low-molecular-weight organic acids hematite quinclorac adsorption mechanism

基金项目:湖南省研究生科研创新项目(CX2011B309);农业部农药残留试验项目(NYBNYCL20100057);湖南省科技厅项目(2006FJ4266);湖南省科技厅一般项目(2014SK3178)

作者	单位	E-mail
杨丽华	湖南农业大学资源环境学院, 长沙 410128 湖南农业大学农业环境保护研究所, 长沙 410128
龚道新	湖南农业大学资源环境学院, 长沙 410128 湖南农业大学农业环境保护研究所, 长沙 410128	gdx4910@163.com
袁雅洁	湖南农业大学资源环境学院, 长沙 410128
周健	湖南农业大学资源环境学院, 长沙 410128
肖浩	湖南农业大学资源环境学院, 长沙 410128

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中文摘要:

采用批量平衡振荡法研究了6种低分子量有机酸对人工合成的赤铁矿吸附二氯喹啉酸的影响,并利用傅里叶红外光谱(FTIR)探讨其机理。结果表明:不同浓度的6种低分子量有机酸存在时,Freundlich 模型能较好地描述二氯喹啉酸在赤铁矿中的吸附行为(R² >0.749),二氯喹啉酸与赤铁矿的总吸附能力(lgKf值)从高到低顺序为乙酸>草酸>丁二酸>酒石酸>苹果酸>柠檬酸;在供试浓度范围内(0～32 mmol·L^-1), 乙酸、柠檬酸、草酸、酒石酸、丁二酸和苹果酸均促进二氯喹啉酸的吸附,其中高浓度的草酸促进作用较明显。FTIR分析表明, 二氯喹啉酸主要通过氢键、络合反应及电荷转移等作用吸附在赤铁矿上,赤铁矿吸附二氯喹啉酸后Fe-O键特征峰均未发生变化,吸附主要是由表面作用引起的。分别加入乙酸、草酸和柠檬酸后, 乙酸(草酸和柠檬酸)强烈的缔结在Fe-O键结构上,均在赤铁矿表面上形成了Fe-O-二氯喹啉酸-乙酸(草酸和柠檬酸)结构,赤铁矿、二氯喹啉酸与乙酸(草酸和柠檬酸)之间存在配位络合作用、氢键和电荷转移等作用。

英文摘要:

Adsorption of chemicals in soil greatly influences their bioavailability and environmental fates. Here the effects of six low-molecular-weight organic acids on the adsorption of quinclorac by hematite were studied using batch equilibrium technique. The adsorption mechanisms were also explored by FTIR spectral analysis method. Freundlich equation fitted well the adsorption isotherms of quinclorac on hematite under the presence of six low-molecular-weight organic acids at different concentrations(R² >0.749). Total sorption capacity(lgKf)of quinclorac on hematite was in order of acetic acid>oxalic acid> succinic acid> tartaric acid >malic acid >citric acid. All six organic acids mildly promoted the adsorption of quinclorac on hematite at the concentrations of 0 to 32 mmol·L^-1, with the strongest promoting effects by oxalic acid at high concentrations. Results of FTIR showed that the adsorption of quinclorac by hematite was mostly via weak forces such as H-bond, complexation reaction, charge transfer and so on. The typical peaks of the Fe-O bond in a-Fe₂O₃ did not change before and after adsorption, suggesting that the adsorption occurred on the surface of hematite.The binding of organic acids with Fe-O bonds facilitated the formation of Fe-O-quinclorac-acetic acids structure on the surface of hematite.

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