石墨烯改性硅藻土对甲基橙的吸附  

Adsorption of methyl orange from water by diatomite modified with graphene oxide

作　　者：张绍均[1] 许文静[2] ZHANG Shao-jun;XU Wen-jing(Department of Health Education,Jiaozuo Center for Disease Control and Prevention,Jiaozuo Henan 454000,China;Institute of Technology,Jiaozuo Teachers College Polytechnic)

机构地区：[1]焦作市疾病预防控制中心健康教育所,河南焦作454000 [2]焦作师范高等专科学校理工学院

出　　处：《中国卫生工程学》2021年第4期542-544,549,共4页Chinese Journal of Public Health Engineering

基　　金：河南省科学技术厅科技计划项目(182102210420)。

摘　　要：目的以硅藻土为原料,经微量氧化石墨烯(GO)改性制备高效复合吸附剂(DG)。方法采用扫描电子显微镜、X射线衍射和静态吸附实验对该吸附剂进行表征和性能测试。结果用1%的GO改性硅藻土,其吸附能力提高35%。在甲基橙(MO)起始浓度<150 mg/L的溶液中,60 min去除率在92%以上。吸附MO的最佳pH值为3.0,最大吸附量为252.8 mg/g。准二阶动力学模型能很好地描述MO在DG上的吸附过程。MO在DG上的吸附主要归因于静电作用、氢键和分子间作用力。结论该方法为改性硅藻土并提高其吸附性能提供了一条新途径,具有广泛的应用前景。Objective To prepare the the graphene oxide/diatomite(DG)composite by acid-treated diatomite surface functionalized with graphene oxide(GO).Methods The DG composite was characterized by scanning electron microscopy,X-ray diffraction spectroscopy.Results The adsorption capacity of DG composite was increased by 35%compared with pure diatomite.The removal rate was above 92%in 60 min when the initial concentration of MO was less than 150 mg/L.The maximum adsorption capacity of the DG composite was 252.8 mg/g at pH 3.0 and the adsorption process was well described by the pseudo-second-order kinetic model.The adsorption was mainly attributed to electrostatic interaction,hydrogen bond and intermolecular interactions between anionic dye MO and the adsorbents.Conclusion The synergistic interactions of diatomite and GO may provide a new path to fabricate novel DG composite for a wide range of applications such as adsorption.

关 键 词：硅藻土 石墨烯 吸附 甲基橙 染料 

分 类 号：R123.3[医药卫生—环境卫生学]