Non-Competitive and Competitive Adsorption of Pb2+, Cd2+ and Zn2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration

被引：8
|
作者：
Li, Xue [1 ]
He, Songbao [1 ]
Feng, Chongling [2 ]
Zhu, Yanke [1 ]
Pang, Ya [1 ]
Hou, Juan [1 ]
Luo, Kun [1 ]
Liao, Xingsheng [1 ]
机构：
[1] Changsha Univ, Coll Biol & Environm Engn, Changsha 410003, Hunan, Peoples R China
[2] Cent South Univ Forestry & Technol, Inst Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China
来源：
SUSTAINABILITY | 2018年 / 10卷 / 01期
基金：
中国国家自然科学基金;
关键词：
competitive adsorption; micellar-enhanced ultrafiltration (MEUF); heavy metal ions; sodium dodecyl sulfate (SDS); HEALTH-RISK ASSESSMENT; SIMULTANEOUS REMOVAL; MIXED SURFACTANTS; WASTE-WATER; AQUEOUS-SOLUTIONS; CADMIUM; MEUF; PHENOL; PH;
D O I：
10.3390/su10010092
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Competitive adsorption of Pb2+, Cd2+ and Zn2+ ions on sodium dodecyl sulfate (SDS) in binary mixtures were investigated compared with non-competitive adsorption in the unitary metal solution in micellar-enhanced ultrafiltration at a temperature of 25 degrees C. Mutual interference effects were investigated based on the removal rate, the Langmuir Competitive Model (LCM) and equilibrium adsorption capacity ratios, q(e)/q(m), which indicated the presence of other metal ions. The results indicated that the removal rate and adsorption capacity of Pb2+ were higher than that of the other metal ions in unitary and binary systems. The effects on SDS micelles for Cd-Pb and Zn-Pb combinations were found to be antagonistic. However, it was a favorable effect for the Cd-Zn combination, and the metal ions sorption followed the order: Pb2+ > Cd2+ > Zn2+. The behavior of non-competitive and competitive adsorption for Cd2+ and Zn2+ in a single system and in the presence of Pb2+ were well described by LCM. Moreover, the LCM showed poor fitting to non-competitive and competitive adsorption of Pb2+ in a single solution and in the presence of Cd2+ or Zn2+. In conclusion, the removal of Pb2+ in the presence of Zn2+ or Cd2+ showed greater efficacy than that of Cd2+ or Zn2+ in the presence of Pb2+.
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页数：12
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