%0 Journal Article %T Bentonite modified with cetyltrimethylammonium chloride as highly efficient anion exchanger for perchlorate ion
CTAC改性膨润土吸附去除水体中高氯酸盐的离子交换性能研究 %A XIAO Ou %A CHEN Bing %A YANG Zhiquan %A
肖讴 %A 陈兵 %A 杨志泉 %J 环境科学学报 %D 2013 %I %X Cationic surfactant cetyltrimethylammonium chloride (CTAC) was employed to modify a bentonite for enhancing its adsorption for perchlorate. The results showed that CTAC modification greatly improved adsorption of bentonite. The perchlorate uptake on CTAC-bentonite from 0.1 to 1 mmol·L-1 solution rapidly attained equilibrium within 6 h. The perchlorate uptake on CTAC-bentonite followed the Langmuir isotherm model with capacity of 0.48 mmol·g-1. In addition, the adsorption capacity persisted in a wide pH of 4~10. High selectivity of CTAC-bentonite for perchlorate ion was reflected in the high distribution coefficient values (>1.5×103 cm3·g-1) with selectivity sequence of HPO42- < SO42- < NO3-< ClO4-. This selectivity sequence corresponded to the sequence of increasing hydration energy of anions. CTAC-bentonite regeneration using 1 mol·L-1 of HCl solution was investigated, which showed efficiency of 96%. CTAC-bentonite could be reused directly after regeneration with 1 mol·L-1 of HCl solution. %K cetyltrimethylammonium chloride %K bentonite %K perchlorate ion %K selectivity %K uptake %K regeneration
十六烷基三甲基氯化铵(CTAC) %K 膨润土 %K 高氯酸根离子 %K 选择性 %K 吸附 %K 再生 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3ff3aba7486768130c3ff830376f43b398e0c97f0ff2dd53&cid=a7ca601309f5fed03c078bce383971dc&jid=03a55e61a8750acac6af81ef9e2ac838&aid=9c65539b20e123fc5dc520e1dead9e59&yid=ff7aa908d58e97fa&vid=27746bceee58e9dc&iid=0b39a22176ce99fb&sid=bfb86b6ed3a99b9d&eid=f27a401e323b6fad&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=0&reference_num=28