Fe3O4@ABc复合材料的制备及其对水中甲基橙的吸附  

Preparation of Fe3O4@ABc composite and its adsorption for methyl orange in water

作　　者：王向辉[1] 石建军 游诚航[1] 颜慧琼[1] 史载锋[1] 林强[1] WANG Xianghui;SHI Jianjun;YOU Chenghang;YAN Huiqiong;SHI Zaifeng;LIN Qiang(Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province,Key Laboratory of Soil Pollution Remediation and Resource Reuse of Haikou City,College of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158,Hainan,China)

机构地区：[1]海南省水环境污染治理与资源化重点实验室,海口市土壤污染修复与资源化重点实验室,海南师范大学化学与化工学院,海南海口571158

出　　处：《精细化工》2020年第7期1422-1428,共7页Fine Chemicals

基　　金：海南省重点研发计划项目——社会发展方向(ZDYF2018170);教育部创新团队项目(IRT-16R19);海口市重点研发平台项目(2017048);海南师范大学大学生创新项目。

摘　　要：以Fe3O4纳米粒子和海藻生物质炭(ABc)为原料,采用共沉淀法制备了磁性海藻生物质炭(Fe3O4@ABc)复合材料,并用于甲基橙(MO)的吸附。通过XRD、SEM、TEM、FTIR和VSM对Fe3O4@ABc复合材料进行了表征。考察了溶液pH、吸附剂添加量对MO吸附性能的影响,并进行了吸附动力学和等温吸附模型拟合。结果表明,Fe3O4纳米粒子成功复合到ABc表面,Fe3O4@ABc复合材料具有超顺磁性,在外在磁场的作用下能够快速分离;当m(ABc)∶m(Fe3O4)=2∶1时,制备的Fe3O4@ABc复合材料比表面积为622.88m2/g,平均孔径1.55 nm,具有良好的MO去除效果。当MO质量浓度为100 mg/L,Fe3O4@ABc添加量为10 mg,pH为3,吸附时间240 min,MO的去除率为96.14%。制备的Fe3O4@ABc复合材料对MO的吸附过程符合拟一级动力学模型,吸附等温线符合Freundlich模型,并以物理吸附为主,化学吸附为辅。Magnetic algal biochar(Fe3O4@ABc)composite was prepared by coprecipitation method with Fe3O4 nanoparticles and algal biochar(ABc)as raw materials and used for methyl orange(MO)adsorption.The Fe3O4@ABc composite was characterized by XRD,SEM,TEM,FTIR and VSM.The effects of solution pH and adsorbent dosage on the adsorption of MO were investigated.The adsorption kinetics and isothermal model were fitted.The results showed that Fe3O4 nanoparticles successfully composited on the surface of ABc.The obtained Fe3O4/ABc composite had superparamagetism and could be separated rapidly under an applied magnetic field.The specific surface area and average pore size of Fe3O4/ABc composite[m(ABc)∶m(Fe3O4)=2∶1]were 622.88 m2/g and 1.55 nm,respectively.The Fe3O4/ABc composite exhibited excellent MO removal effect.The removal rate of MO was 96.14%under the conditions of mass concentration of MO 100 mg/L,addition amount of adsorbent 10 mg,pH=3,adsorption time 240 min.The adsorption process of the prepared Fe3O4@ABC for MO conformed to the pseudo first-order kinetic model,and the adsorption isotherm was fitted well the Freundlich model.The adsorption process was mainly physical adsorption,supplemented by chemical adsorption.

关 键 词：海藻生物质炭 吸附 甲基橙 磁性功能材料 

分 类 号：X703[环境科学与工程—环境工程] O647.33[理学—物理化学]