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制备出了一种能有效去除水中持久性有机污染物的三油酸甘油酯复合吸附剂.以狄氏剂和异狄氏剂作为目标污染物,研究了其吸附平衡及吸附过程的影响因素.实验结果表明,复合吸附剂对两种目标污染物的吸附等温线符合Freundlich模型,证明了两种目标污染物在吸附剂-水两相中为分配吸附.狄氏剂的吸附平衡常数大于异狄氏剂的吸附平衡常数,其主要原因是狄氏剂的辛醇-水系数大于异狄氏剂的辛醇-水系数.同时还研究了不同因素(温度,离子强度,pH,腐殖酸浓度)对狄氏剂和异狄氏剂吸附速度的影响.实验结果表明,较高的温度、较低的离子强度、较低的pH和较低的腐殖酸浓度有利于提高狄氏剂的吸附速度,而异狄氏剂的吸附速度则随温度的升高和pH的增加而减慢,随腐殖酸浓度的增加先加快后减慢,与离子强度的关系不大.
A trioleic acid glyceride complex adsorbent that can effectively remove persistent organic pollutants in water was prepared, and the effects of dieldrin and endrin on the adsorption equilibrium and adsorption process were studied. The experimental results show that the adsorption isotherms of the two adsorbents conform to the Freundlich model and the adsorption of the two target pollutants in the adsorbent-water two phases is proved. The adsorption equilibrium constant of dieldrin is larger than that of the iso-di The main reason is that the octanol-water coefficient of dieldrin is greater than the octanol-water coefficient of endrin, and the effects of different factors (temperature, ionic strength, pH, humic acid concentration ) On the adsorption rate of dieldrin and endrin.The experimental results show that higher temperature, lower ionic strength, lower pH and lower concentration of humic acid help to improve the adsorption of dieldrin While the adsorption rate of endrin decreased with the increase of temperature and pH, and then accelerated with the increase of humic acid concentration and then slowed down, which had little to do with the ionic strength.