农业环境科学学报Issue(9)：1755-1761,7.DOI:10.11654/jaes.2014.09.013
HDTMAB改性蒙脱石对二氯喹啉酸的吸附研究
Quinclorac Adsorption on HDTMAB-modified Montmorillonite
摘要
Abstract
Natural montmorillonite, characteristized with high hydrophilicity, shows little adsorption of non-polar organic substances. This study examined the adsorption of quinclorac on the montmorillonite modified by hexadecyltrimethyl ammonium bromide(HDTMAB)as influenced by contact time, adsorbate concentration, temperature, pH and adsorbent doses. The modified adsorbent was also characterized by X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR). HDTMAB was adsorbed in the interlayer of montmorillonite, which expanded the layer spacing of the modified montmorillonite. The modified montmorillonite exhibited higher quinclorac removal effi-ciency than the unmodified montmorillonite did. The experimental data was fitted very well with the pseudo-second-order kinetic model, in-dicating that chemisorption was the controlling step of the adsorption. The adsorption isotherm of quinclorac was in good agreement with Linear and Freundlich isotherm models. The adsorption capacity decreased from 1.86 mg·g-1 to 1.65 mg·g-1 with temperature increase from 25℃to 45℃at an initial concentration of 10.00 mg·L-1, suggesting that the adsorption was exothermic. Adsorption capacity of quinclorac on modified montmorillonite decreased with increased pH.关键词
二氯喹啉酸/HDTMAB/改性/吸附Key words
quinclorac/HDTMAB/modification/adsorption分类
农业科技引用本文复制引用
丁春霞,何紫君,郑琛,蔡利民,龚道新..HDTMAB改性蒙脱石对二氯喹啉酸的吸附研究[J].农业环境科学学报,2014,(9):1755-1761,7.基金项目
湖南省教育厅科学研究项目（13C393）；湖南省科技厅一般项目（2014SK3178）；农业部农药残留基金项目 （）
