Highly Efficient Adsorption of Heavy Metals and Cationic Dyes by Smart Functionalized Sodium Alginate Hydrogels

被引：33
作者：
Shi, Tianzhu [1 ,2 ]
Xie, Zhengfeng [2 ]
Mo, Xinliang [1 ]
Feng, Yulong [1 ]
Peng, Tao [1 ]
Song, Dandan [1 ]
机构：
[1] Moutai Inst, Dept Brewing Engn, Renhuai 564500, Peoples R China
[2] Southwest Petr Univ, Coll Chem & Chem Engn, Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Peoples R China
来源：
GELS | 2022年 / 8卷 / 06期
关键词：
sodium alginate; modification; heavy metals; dye; adsorption; AQUEOUS-SOLUTION; REMOVAL; GRAPHENE; CHITOSAN; PB(II); IONS; EQUILIBRIUM; PERFORMANCE; PARTICLES; COMPOSITE;
D O I：
10.3390/gels8060343
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
In this paper, functionalized sodium alginate hydrogel (FSAH) was prepared to efficiently adsorb heavy metals and dyes. Hydrazide-functionalized sodium alginate (SA) prepared hydrazone groups to selectively capture heavy metals (Pb2+, Cd2+, and Cu2+), and another functional group (dopamine grafting), serves as sites for adsorption methylene blue (MB), malachite green (MG), crystal violet (CV). Thermodynamic parameters of adsorption indicated that the adsorption process is endothermic and spontaneous. The heavy metals adsorption by FSAH was physical adsorption mainly due to Delta H-theta < 40 kJ/mol, and the adsorption of cationic dyes fitted with the Langmuir models, which indicated that the monolayer adsorption is dominated by hydrogen bonds, electrostatic interactions, and pi-pi interactions. Moreover, the adsorption efficiency maintained above 70% after five adsorption-desorption cycles. To sum up, FSAH has great application prospect.
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页数：13
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