Modified kaolin hydrogel for Cu2+ adsorption

被引：19
作者：
Chen, Jin [1 ]
Zhao, Kun [1 ]
Liu, Lu [1 ]
Gao, Yuyu [1 ]
Zheng, Lu [1 ]
Liu, Min [1 ]
机构：
[1] Xian Univ Sci & Technol, Coll Mat Sci & Engn, Xian 710054, Peoples R China
来源：
E-POLYMERS | 2022年 / 22卷 / 01期
关键词：
adsorbent; composite hydrogel; kinetic model; cooper; kaolin; WASTE-WATER; SUPERABSORBENT POLYMER; AQUEOUS-SOLUTION; GRAPHENE OXIDE; CROSS-LINKING; HEAVY-METALS; COPPER IONS; REMOVAL; CHROMIUM; BEADS;
D O I：
10.1515/epoly-2022-0085
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Removal of Cu2+ ions from contaminated water is an important but challenging task. This study reports the synthesis of a composite hydrogel from two natural polysaccharides, namely, sodium alginate and chitosan, using inexpensive kaolin as a raw material and polyacrylamide as a modifier. The hydrogel had a high adsorption capacity and selectivity for Cu2+. The composite hydrogel was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The pseudo-second-order kinetic model was the most suitable model for the kinetic results, and the Langmuir isotherm model was the most representative of the sorption system. The results revealed that the adsorption process was mainly controlled by chemisorption. The maximum adsorption capacity of the adsorbent was 106.4 mg & BULL;g(-1). Therefore, this study presents a new perspective on the application of composite hydrogels as Cu2+ adsorbents.
引用
收藏
页码：986 / 996
页数：11
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