Equilibrium adsorption study of the adsorptive removal of Cd2+ and Cr6+ using activated carbon

被引：28
作者：
Wang, Weiliang [1 ,2 ]
Liu, Ying [1 ,2 ]
Liu, Xiaohui [3 ]
Deng, Baojun [4 ]
Lu, Shaoyong [5 ]
Zhang, Yaru [1 ]
Bi, Bin [5 ]
Ren, Zongming [1 ,2 ]
机构：
[1] Shandong Normal Univ, Coll Geog & Environm, Jinan 250358, Shandong, Peoples R China
[2] Shandong Nomial Univ, Inst Environm & Ecol, Jinan 250358, Shandong, Peoples R China
[3] Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China
[4] Jinan Environm Monitoring Ctr, Jinan 250014, Shandong, Peoples R China
[5] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China
来源：
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2018年 / 25卷 / 25期
基金：
中国国家自然科学基金;
关键词：
Activated carbon; Cr6+; Cd2+; Adsorption-desorption; Speciation; Mechanism; HEAVY-METAL POLLUTION; ZERO-VALENT IRON; AQUEOUS-SOLUTIONS; GRAPHENE OXIDE; SEWAGE-SLUDGE; SPECIATION TRANSFORMATION; CHEMICAL SPECIATION; CR(VI); WATER; IONS;
D O I：
10.1007/s11356-018-2635-5
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The performance of activated carbon (AC) with respect to characterization, adsorption kinetics, thermodynamics, and isotherms was addressed in this study. The effects of initial concentration, pH, contact time, ion strength, and temperature on removal efficiency were also studied. The adsorption isotherms of Cd2+ and Cr6+ on activated carbon can fit the Langmuir model well, and correlation coefficients were above 0.99, all higher than the Freundlich and Temkin models. The maximum adsorption quantities of Cd2+ and Cr6+ were 19.380 and 19.305 mg g(-1) at 25 degrees C, respectively. The adsorption capacities of Cd2+ and Cr6+ are clearly pH dependent. The kinetics of the removal of Cd2+ and Cr6+ was in agreement with a pseudo-second-order model, and the adsorption efficiency of Cd2+ is higher than that of Cr6+. The thermodynamic results showed that increased temperature is favorable to adsorption. The speciation on activated carbon was mainly residual Cd2+ and Cr6+, and the potential ecological risk of Cd2+ is higher than that of Cr6+. The adsorptions of Cd2+ and Cr6+ on activated carbon were dominated by chelation and ion exchange, respectively.
引用
收藏
页码：25538 / 25550
页数：13
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