高等学校化学学报2017，Vol.38Issue(2)：217-224,8.DOI:10.7503/cjcu20160664
部分还原氧化石墨烯-Fe3O4对水中Mn(Ⅱ)的快速去除
Fast Removal of Aqueous Mn(Ⅱ) Using Partially Reduced Graphene Oxide-Fe3O4?
摘要
Abstract
Partially reduced graphene oxide-Fe3O4 composite(PRGO-Fe3O4) was prepared by one step co-precipitation onto graphene oxide( GO) synthesized by modified Hummers method. The as obtained composite was characterized by XRD, FESEM, EDX, HRTEM, SAED, XPS and FTIR. The impact of pH, contact time, dosage, foreign substances, reduction of GO and cycle times on the adsorption performance of the com-posite towards Mn(Ⅱ) were investigated and the dsorption isotherm, thermodynamics and kinetics were ana-lyzed. The results indicate that Fe3O4 distribute evenly and uniformly in the as-obtained composite, with a fine particle size of 15—20 nm, resulting in a low remanence and coercivity. The composite shows efficient adsorp-tion property and good recycability towards aqueous Mn (Ⅱ) owing to the thin GO sheets in its structure caused by the anchoring effect of Fe3 O4 . Adsorption equilibrium was reached within 3 min with the adsorption percent and capacity of 99.35% and 404.49 mg/g, respectively, under the conditions of pH=7, dosage 500 mg/L, and initial concentration of Mn(Ⅱ) of 201.32 mg/L, with the subsequent magnetic separation taking only 10 s. After five consecutive cycles, the adsorption capacity of the composite remians 78% that of the first cycle. Analyses on the mechanism and thermodynamics show that the adsorption is an endothermic, sponta-neous and monolayer chemical adsorption step.关键词
部分还原氧化石墨烯-四氧化三铁/Mn(Ⅱ)的快速去除/吸附性能Key words
Partially reduced graphene oxide-Fe3O4(PRGO-Fe3O4)/Fast removal of Mn(Ⅱ)/Adsorption property分类
化学化工引用本文复制引用
布林朝克,郭婷,张邦文,戴志安,俞慧涛,邢瑞光,资卢雄..部分还原氧化石墨烯-Fe3O4对水中Mn(Ⅱ)的快速去除[J].高等学校化学学报,2017,38(2):217-224,8.基金项目
国家自然科学基金(批准号:51164026)、 内蒙古自然科学基金(批准号:2015MS0219)和内蒙古科技大学材料与冶金学院青年人才孵化器平台(批准号:2014CY012)资助.?Supported by the National Natural Science Foundation of China( No. 51164026) , the Natural Science Foundation of Inner Mongolia, China ( No. 2015MS0219) and the Talent Incubation Funding of School of Materials and Metallurgy, Inner Mongolia University of Science and Technolo-gy, China( No. 2014CY012) . （批准号:51164026）
