Removal of humic acid from aqueous solution by cetylpyridinium bromide modified zeolite

被引：72
|
作者：
Zhan, Yanhui [1 ]
Zhu, Zhiliang [1 ]
Lin, Jianwei [2 ]
Qiu, Yanling [1 ]
Zhao, Jianfu [1 ]
机构：
[1] Tongji Univ, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China
[2] Shanghai Ocean Univ, Coll Marine Sci, Shanghai 201306, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2010年 / 22卷 / 09期
基金：
中国国家自然科学基金;
关键词：
modified zeolite; cetylpyridinium bromide; humic acid; SURFACTANT-MODIFIED ZEOLITE; HDTMA-MODIFIED ZEOLITE; DRINKING-WATER; WASTE-WATER; ADSORPTION; BENTONITE; ISOTHERM; KINETICS; SORPTION; AS(V);
D O I：
10.1016/S1001-0742(09)60258-8
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Natural zeolite was modified by loading cetylpyridinium bromide (CPB) to create more efficient sites for humic acid (HA) adsorption. The natural and CPB modified zeolites were characterized with X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and elemental analysis. The effects of various experimental parameters such as contact time, initial HA concentration, solution pH and coexistent Ca2+, upon HA adsorption onto CPB modified zeolites were evaluated. The results showed that natural zeolite had negligible affinity for HA in aqueous solutions, but CPB modified zeolites exhibited high adsorption efficiency for HA. A higher CPB loading on natural zeolites exhibited a larger HA adsorption capacity. Acidic pH and coexistent Ca2+ were proved to be favorable for HA adsorption onto CPB modified zeolite. The kinetic process was well described by pseudo second-order model. The experimental isotherm data fitted well to Langmuir and Sips models. The maximum monolayer adsorption capacity of CPB modified zeolite with surfactant bilayer coverage was found to be 92.0 mg/g.
引用
收藏
页码：1327 / 1334
页数：8
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