改性石墨烯对水中亚甲基蓝的吸附性能研究  

Adsorption Properties of Modified Graphene for Methylene Blue Removal from Wastewater

作　　者：吴艳[1,2] 罗汉金[1,2] 王侯 张子龙[1,2] 王灿[1,2] 王雨微[1,2] 

机构地区：[1]华南理工大学环境与能源学院,广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广州510006 [3]湖南大学环境科学与工程学院,长沙410082

出　　处：《环境科学》2013年第11期4333-4340,共8页Environmental Science

基　　金：国家自然科学基金项目(40973074)

摘　　要：对十六烷基三甲基溴化铵(CTAB)改性石墨烯用于水中亚甲基蓝(MB)的去除进行了研究.用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射分析仪(XRD)、傅里叶红外光谱分析仪(FTIR)和热重分析仪(TGA)对石墨烯和改性石墨烯性能进行表征.探讨了反应时间、pH、温度、剂量对石墨烯和改性石墨烯去除MB的影响.结果表明,在石墨烯制备过程中添加CTAB可以明显增大比表面积,提高MB的去除率.反应过程在前15 min内反应速率很快,并约在120 min内达到吸附平衡.吸附动力学符合伪二级动力学模型.最佳反应温度为293 K,吸附剂投加量的最适浓度为2 g·L-1,且吸附量的大小与溶液的初始pH值无关.通过Langmuir等温吸附方程得到改性石墨烯的最大吸附量86.43 mg·g-1,且为放热反应.In this study, cetyhrimethylammonium bromide （CTAB） was chosen to modify graphene, which was applied to remove methylene blue （MB） from aqueous solutions. The characteristics of graphene and modified graphene were characterized by X-ray diffraction （XRD）, fourier transform infrared spectrum （FTIR）, thermal gravimetric analyzer （TGA）, transmission electron microscopy （TEM） , and scanning electron microscopy （SEM）. The effects of factors including pH, contact time, temperature, and dosage on the adsorption properties of MB onto graphene and modified graphene were investigated. The results revealed that the addition of CTAB in preparation could obviously increase the specific surface area and improve the efficiency of removal. The adsorption processes were rapid within the first 15 min and reached equilibrium in about 120 min. The adsorption kinetics fitted well with the pseudo-second-order model. The optimal reaction temperature was 293 K, the optimal concentration of adsorbent dosage was 2 g. L-1 , and the initial pH value of the solution had little impact on the amount of adsorption. The adsorption capacity of MB on modified graphene inferred from the Langmuir model was 86. 43 mg.g-1 at 293 K, and the adsorption was an exothermic process.

关 键 词：石墨烯 吸附 亚甲基蓝 表征 表面活性剂 

分 类 号：X703.1[环境科学与工程—环境工程]