Preparation of a novel graphene oxide/Fe-Mn composite and its application for aqueous Hg(II) removal

被引：157
作者：
Tang, Jingchun [1 ,2 ,3 ]
Huang, Yao [1 ]
Gong, Yanyan [1 ,2 ,3 ]
Lyu, Honghong [1 ]
Wang, Qilin [4 ]
Ma, Jianli [5 ]
机构：
[1] Nankai Univ, Coll Environm Sci & Engn, Tianjin 300350, Peoples R China
[2] Minist Educ, Key Lab Pollut Proc & Environm Criteria, Tianjin 300350, Peoples R China
[3] Tianjin Engn Ctr Environm Diag & Contaminat, Tianjin 300350, Peoples R China
[4] Univ Queensland, Adv Water Management Ctr, St Lucia, Qld 4072, Australia
[5] Tianjin Acad Environm Sci, Tianjin 300191, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2016年 / 316卷
基金：
中国国家自然科学基金;
关键词：
Graphene oxide/Fe-Mn; Mercury removal; Water treatment; Sorption; Biological effects; MERCURY REMOVAL; ELEMENTAL MERCURY; GRAPHITE OXIDE; IN-SITU; WATER; ADSORPTION; SORPTION; SURFACE; EQUILIBRIUM; ADSORBENT;
D O I：
10.1016/j.jhazmat.2016.05.028
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A novel graphene oxide/Fe-Mn (GO/Fe-Mn) composite was synthesized (molar ratio of Fe/Mn = 3/1 and mass ratio of Fe/GO = 1/7.5) and investigated for the sorption characteristics and mechanisms of aqueous mercury (Hg2+) as well as the biological effects to wheat and rice. Characterization tests showed that Fe-Mn oxides were impregnated onto GO sheets in an amorphous form through oxygen-containing functional groups (i.e., C=O, epoxy C-O-C, carboxyl O=C-O, and C-O) and pi-pi interactions. GO/Fe-Mn possessed large surface area, surface enhanced Raman scattering with more spa defects, and greater thermal stability than GO. XPS analysis revealed that Fe2O3, FeOOH, MnO2, MnOOH, and MnO were the dominant metal oxides in GO/Fe-Mn. Pseudo-second-order kinetic model and Sips isotherm model fitted well with the sorption kinetic and isotherm data. The maximum sorption capacity for mercury was 32.9 mg/g. Ligand exchange and surface complexation were the dominant mechanisms for mercury removal. GO/Fe-Mn greatly reduced the bioavailability of mercury to wheat and rice, even promoted the seedling growth. This work suggests that GO/Fe-Mn can be used as an effective and environmental friendly adsorbent in heavy metal remediation. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：151 / 158
页数：8
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