Biomaterials cross-linked graphene oxide composite aerogel with a macro-nanoporous network structure for efficient Cr (VI) removal

被引:24
作者
Li, Lanlan [1 ,2 ]
Wei, Zhiyang [1 ]
Liu, Xiaowei [1 ,2 ]
Yang, Yunhe [1 ]
Deng, Chenxun [3 ]
Yu, Zhimin [3 ]
Guo, Zhi [1 ,2 ]
Shi, Jianghong [4 ]
Zhu, Chengzhu [1 ,2 ]
Guo, Wei [4 ]
Sun, Zhenjie [5 ]
机构
[1] Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
[2] Hefei Univ Technol, Key Lab Nanominerals & Pollut Control Anhui Highe, Hefei 230009, Peoples R China
[3] Hefei Univ, Dept Biol & Environm Engn, Hefei 230022, Peoples R China
[4] Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
[5] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
基金
中国国家自然科学基金;
关键词
Chitosan; Graphene oxide; Polydopamine; Adsorption; Aerogel; Hexavalent chromium; OXIDE/CHITOSAN AEROGEL; GREEN SYNTHESIS; CR(VI); CHITOSAN; ADSORPTION; IONS; FABRICATION; ADSORBENT; HYDROGEL; PB(II);
D O I
10.1016/j.ijbiomac.2019.11.174
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Chitosan (CS) is an attractive bio-adsorbent in pollutant removal due to its environment-friendly properties and abundant adsorption sites. However, the weak mechanical properties and strong dissolubility in acidic conditions of CS hinder its wide application. Herein, a facile method was proposed to fabricate polydopamine (PDA) and CS cross-linked graphene oxide (GO) (GO/CS/PDA) composite aerogel for Cr (VI) removal. GO was cross-linked with CS, forming a reinforced and three-dimensional macroporous structure; the introduced PDA was simultaneously cross-linked with CS and GO, providing more abundant nanopores and active sites for Cr(VI) removal. Based on the batch experiment results, GO/CS/PDA exhibited an optimized mass ratio (1:20:2) of GO, CS, and PDA for the most effective Cr(VI) adsorption; the adsorption removal rate of Cr(VI) was pH dependent, with the highest removal rate at pH = 3.0. The pseudo-second-order kinetic and Freundlich models were more suitable for fitting the adsorption kinetics and adsorption isotherms, respectively, and the maximum adsorption capacity for GO/CS/PDA was 312.05 mgig at 298 K. Thermodynamics parameters indicated that the adsorption was a spontaneous and exothermic process. The excellent mechanical integrity and reusable adsorption performance of GO/CS/PDA promise the adsorbent with satisfactory reusability. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:1337 / 1346
页数:10
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