CTMAB-Modified Bentonite–Based PRB in Remediating Cr(VI) Contaminated Groundwater

被引：0
作者：
Fei Wang
Wangqi Xu
Zhaochen Xu
Haoyu Liu
机构：
[1] Southeast University,Institute of Geotechnical Engineering, School of Transportation
来源：
Water, Air, & Soil Pollution | 2020年 / 231卷
关键词：
CTMAB modified bentonite; Cr(VI); Fixed-bed column tests; Permeable reactive barriers; Adsorption;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Cetyl trimethylammonium bromide (CTMAB)–modified bentonite was synthesized as adsorbent for the removal of Cr(VI) from aqueous solutions. Batch adsorption studies show that the adsorption capacity of CTMAB-modified bentonite (1.962 mg g−1) was about 19 times higher than that of natural bentonite (0.101 mg g−1). The weakly acidic or neutral environment can improve the adsorption ability of both natural and modified bentonites. Cr(VI) adsorption onto CTMAB-modified bentonite follows the Langmuir model and obeys the pseudo-second-order model. In a fixed-bed column test, the adsorption capacities of 5% modified bentonite with 95% sand, and 10% modified bentonite with 90% sand were 0.31 mg g−1 and 0.35 mg g−1, respectively. These values were much lower than their theoretical maximum adsorption capacity using the Langmuir model.
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