石墨烯的制备及其吸附性能研究  

Study on Preparation and Adsorption Performance of Graphene

作　　者：成岳 左玉环 范小丰 

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,景德镇333403

出　　处：《中国陶瓷》2017年第6期14-20,共7页China Ceramics

基　　金：江西省教育厅重点项目(GJJ14634)

摘　　要：在制备出氧化石墨的基础上制备出石墨烯,并用XRD、SEM、TEM、FT-IR等手段对样品进行了一系列表征。以甲基橙废水为吸附模拟对象,考察了不同pH、温度、投加量对吸附脱色性能的影响,研究表明在45℃下,当甲基橙浓度为20 mg/L,pH=2,石墨烯投加量为300 mg/L时,石墨烯对甲基橙的吸附效果最好,此时吸附量q为56.67 mg/g,吸附脱色率R达85.02%。石墨烯对甲基橙染料废水的吸附脱色过程采用Langmuir和Freundlich等温吸附方程拟合,结果表明Langmuir方程有较好的相关性。分别采用准一级ln(q_e-q_t)=lnq_e-k_1t和准二级t/q_t=1/k_2q_e2+t/q_e模型考察了石墨烯对甲基橙染料废水的吸附动力学,准二级反应模型与实验数据之间有更好的相关性。此外,热力学方程的计算结果表明,石墨烯对甲基橙染料废水溶液的吸附脱色过程是自发吸热过程,且以物理吸附为主。Graphene was prepared on the basis of the preparation of graphite oxide and characterized by means of XRD, SEM, TEM and FT-IR. Methyl orange dye wastewater was used as adsorption object, the effect of pH, temperature, and graphene dosage on adsorption decolorization property was investigated. When concentration of methyl orange is 20 rag/L, pH value is 2, graphene dosage is 300 mg/L, temperature is 45, graphene adsorption decolorization effect of methyl orange is the best, the adsorption amount of Q is 56.67 rag/g, and the adsorption decolorization efficiency R of methyl orange is up to 85.02%. Graphene adsorption decolorization of methyl orange dye wastewater can be described by Langmuir and Freundlich isothermal adsorption equation, and the Langmuir isothermal equation has more correlation. The quasi first-order model of in（qe-qt）=Inqe-k1t and quasi secondary model of t/ qt=1/k2qe^2＋t/qe were used to investigate the graphene adsorption dye wastewater kinetics of methyl orange. The quasi second order reaction model showed better correlation with the experimental data. In addition, the thermodynamic equation calculation results show that the adsorption decolorization process is a spontaneous endothermic process towards methyl orange dye wastewater, and dominated by physical adsorption.

关 键 词：氧化还原法 石墨烯 氧化石墨 甲基橙染料废水 吸附脱色 

分 类 号：TQ175.714[化学工程—硅酸盐工业]