为改善氧化石墨烯(GO)对染料废水中亚甲基蓝(MB)的吸附和分离性能,采用改进的Hummers法、机械共混和一步沉淀法制备了磁性氧化石墨烯(MGO)复合材料,通过场发射扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪对MGO进行了表征,考察了pH、吸附温度、GO质量浓度和纳米Fe3O4质量浓度对MGO吸附MB的影响,并对吸附动力学曲线和吸附等温线进行拟合。结果表明:吸附动力学符合准二级动力学模型,吸附等温线符合Langmuir等温吸附模型;MGO在温度303K、308K和313K对MB的最大饱和吸附量分别为2.039mg/g、2.071mg/g和2.048mg/g。MGO对MB的吸附是以物理吸附为主的吸热反应。
In order to enhance the adsorption and separation property of graphene oxide (GO) for methylene blue (MB),a magnetic graphene oxide (MGO) nanocomposite loaded with Fe3O4 magnetic nanoparticles was synthesized by modified hummers and mechanical blending with one-step precipitation.It was characterized by FESEM,XRD and FT-IR.Batch adsorption study were performed to investigate the effects of solution pH,adsorption temperature,GO concentration and Fe3O4 concentration on the adsorption of MB onto MGO.The adsorption isotherms and kinetics were also studied.The results showed that the adsorption of MB onto MGO fitted well to the pseudo-second-order kinetic model and Langmuir isotherm model better fitted for the result of the adsorption equilibrium.The ideal maximum adsorption capacity was calculated as 2.039mg/g,2.071mg/g and 2.048mg/g under 303K,308K and 313K,respectively.The adsorption of MB onto MGO was mainly physical adsorption.
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基金资助
工业生态与环境工程教育部重点实验室开放基金(KLIEEE-05-03)
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