摘要
采用水热合成法制备Fe_3O_4并与SiO_2同时负载于石墨烯表面,得到石墨烯-Fe_3O_4@SiO_2纳米复合材料.运用SEM,TEM,XPS,FTIR,XRD等技术对石墨烯-Fe_3O_4@SiO_2纳米复合材料进行表征.以甲基红作为有机污染物代表,研究了甲基红溶液pH、吸附时间、温度及甲基红初始浓度对石墨烯-Fe_3O_4@SiO_2纳米吸附性能的影响.结果表明:石墨烯-Fe_3O_4@SiO_2纳米复合材料对甲基红吸附符合Langmuir等温吸附模型和拟二级动力学模型;热力学研究表明,吸附是吸热和自发过程.因此,石墨烯-Fe_3O_4@SiO_2纳米复合材料可作为从水溶液中去除有机污染物的高效吸附剂.
A novel graphene based nanosorbents, Fe304-graphene@ mesoporous Si02 nanoeomposites （deno- ted as MG@ m-Si02 ） was synthesized. The obtained MG@ m-Si02 were characterized by scanning electron microscopic （SEM） , transmission electron microscopy （TEM） , X-ray photoelectron spectroscopy （XPS） , Fou- rier transformed irrfrared spectroscopy （FTIR） and X-ray diffraction （XRD）. The adsorptive property was in- vestigated by using MG@ m-Si02 as sorbents and methyl red （MR） , a common dye, as model of the organic pollutants. Adsorption kinetics, isotherms, thermodynamics as well as effects of pH and adsorbent dose on the adsorption were studied. The adsorption isotherms and kinetics were described by Langmuir isotherm model and pseudo-second-order kinetic model, respectively. Thermodynamic studies suggested that the adsorption of MR onto the MG@ m-SiO2 was endothermie and spontaneous process. The results implied that the MG@ m-Si02 could be served as a cost-effective adsorbent for the removal of organic pollutants from aqueous solutions.
作者
陈佳伟
赵一丹
杨利宁
仲淑贤
吴西林
陈建荣
CHEN Jiawei;ZHAO Yidan;YANC Lining;ZHONC Shuxian;WU Xilin;CHEN Jianrong(College of Geography and Entaionmental Science,Zhejiang Noraml Universy,Jinhua 321004,China)
出处
《浙江师范大学学报（自然科学版）》
CAS
2018年第2期188-193,共6页
Journal of Zhejiang Normal University:Natural Sciences
基金
国家自然科学基金资助项目(21775138)
浙江省公益性技术应用研究分析测试项目(2017C37024)
关键词
石墨烯复合材料
吸附
有机污染物
甲基红
graphene composites
adsorption
organic pollutants
methyl red
