摘要
采用十六烷基三甲基溴化铵（HDTMA）改性高岭土，研究制备条件对有机磷农药甲基异柳磷的吸附性能影响．结果表明，在室温（23～30℃）和pH值为4的条件下，用30μmol·g^-1的HDTMA反应15min，改性制备的有机高岭土对甲基异柳磷的吸附效果最佳．改性高岭土吸附能力比未改性高岭土明显增强，吸附等温线符合Freundlich等温吸附方程．吸附反应速度较快，在最佳吸附条件下，即有机高岭土投加质量浓度为10．0g·L^-1，溶液中甲基异柳磷初始质量浓度为30mg·L^-1，吸附平衡时间为40min．在所选pH=5～9的范围内，有机改性高岭土对甲基异柳磷的吸附率均能保持在80％左右．
Organic modified kaolin samples were prepared by mixing a small quantity of natural kaolin with surfactant solutions of hexa decyl trimethy lammonium （HDTMA）. Series of adsorption isotherm experiments were performed to determine the capacity of organic clays for isofenphos-methyl. The optimal synthetic condition was found as the following： dosage of HDTMA at the proportion of 30μ mol· g ^-1 of the natural kaolin, reaction pH of 4, reaction time of 15 minutes at room temperature. The removal capacity of the HDTMA modified kaolin increased significantly compared with that of the original kaolin sample. The adsorption isotherms were fit well for the Freundlich model; about 80% removal of isofenphos-methyl could be achieved within 40 minutes at the initial concentration isofenphos-methyl of 30 mg· L^-1 , dosage of adsorbent at 10 g · L^-1 in the natural water pH range of 5 to 9.
出处
《华侨大学学报（自然科学版）》
CAS
北大核心
2009年第1期56-61,共6页
Journal of Huaqiao University(Natural Science)
基金
福建省自然科学基金资助项目(D0510005)
