Adsorption of Cr(VI) onto cetylpyridinium bromide modified zeolites:Effect of surfactant loading, solution pH, ionic strength and coexisting anions
Surfactant-modified zeolites (SMZ) with different coverage types were repared by loading the cetylpyridinium bromide (CPB) onto the surface of the natural zeolite collected from Jinyun County, Zhejiang Province, China. The adsorption behavior of Cr(VI) on SMZ was investigated. Natural zeolite and SMZ with CPB monolayer coverage were inefficient for the removal of Cr(VI) from aqueous solution. However, SMZ with CPB patchy bilayer or bilayer coverage was efficient in the removal of Cr(VI) and the Cr(VI) adsorption capacity of SMZ increased with its CPB loading. The Cr(VI) adsorption capacity of SMZ showed a maximum at pH 3-6 and decreased with increasing pH from 6 to 11. The presence of competing anions such as chloride, sulfate and bicarbonate ions reduced the Cr(VI) adsorption capacity of SMZ. The adsorption process was strongly dependent on ionic strength, indicating that anionic exchange and electrostatic interaction were the main mechanisms that govern the adsorption of Cr(VI) on SMZ.
Lin Jianwei Zhan Yanhui Xing Yunqing Liu Yu
College of Marine Science, Shanghai Ocean University, Shanghai, 201306, China College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
国际会议
哈尔滨
英文
1772-1776
2011-03-26（万方平台首次上网日期，不代表论文的发表时间）