标题: Oxide of porous graphitized carbon as recoverable functional adsorbent that removes toxic metals from water

作者: Wang, Y (Wang, Yuan); Cai, MJ (Cai, Minjuan); Chen, T (Chen, Tao); Pan, F (Pan, Feng); Wu, F (Wu, Feng); You, ZX (You, Zhixiong); Li, JJ (Li, Jinjun)

来源出版物: JOURNAL OF COLLOID AND INTERFACE SCIENCE 卷: 606 页: 983-993 DOI: 10.1016/j.jcis.2021.08.082 子辑: 2 出版年: JAN 15 2022

摘要: The numerous oxygenated functional groups on graphite oxide (GO) make it a promising adsorbent for toxic heavy metals in water. However, the GO prepared from natural graphite is water-soluble after exfoliation, making its recovery for reuse extremely difficult. In this study, porous graphitized carbon (PGC) was oxidized to fabricate a GO-like material, PGCO. The PGCO showed an O/C molar ratio of 0.63, and 8.4% of the surface carbon species were carboxyl, exhibiting enhanced oxidation degree compared to GO. The small PGCO sheets were intensely aggregated chemically, yielding an insoluble solid easily separable from water by sedimentation or filtration. Batch adsorption experiments demonstrated that the PGCO afforded significantly higher removal efficiencies for heavy metals than GO, owing to the former's greater functionalization with oxygenated groups. An isotherm study suggested that the adsorption obeyed the Langmuir model, and the derived maximum adsorption capacities for Cr3+, Pb2+, Cu2+, Cd2+, Zn2+, and Ni2+ were 119.6, 377.1, 99.1, 65.2, 53.0, and 58.1 mg/g, respectively. Furthermore, the spent PGCO was successively regenerated by acid treatment. The results of the study indicate that PGCO could be an alternative adsorbent for remediating toxic metal-contaminated waters. (C) 2021 Elsevier Inc. All rights reserved.

作者关键词: Heavy metal; Adsorption; Water treatment; Porous graphitized carbon; Graphene oxide; Functionalized carbon

地址: [Wang, Yuan; Cai, Minjuan; Chen, Tao; Pan, Feng; Wu, Feng; You, Zhixiong; Li, Jinjun] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

通讯作者地址: Li, JJ (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址: lijinjun@whu.edu.cn

影响因子：8.128