金属-有机骨架复合材料Cu-1,3,5-苯三甲酸/氧化石墨烯对亚甲基蓝的吸附性能研究

Study on the absorption of Cu-BTC/GO metal-organic framework composite for methylene blue

利用金属-有机骨架复合材料Cu-1,3,5-苯三甲酸/氧化石墨烯(Cu-BTC/GO)作为吸附剂,研究了其对水相中亚甲基蓝的吸附行为。通过扫描电镜、透射电镜、X射线衍射、红外光谱、热重分析及比表面积分析等手段对该复合材料的结构进行表征。探讨了温度、pH和亚甲基蓝初浓度等因素对Cu-BTC/GO吸附性能的影响。结果表明:在pH=7、30℃的条件下,125mg/L Cu-BTC/GO对10mg/L亚甲基蓝有优异的吸附能力;Cu-BTC/GO对亚甲基蓝的吸附动力学数据符合准二级动力学方程,吸附模型符合Langmuir等温吸附方程;通过Langmuir模型计算可知,该复合材料对亚甲基蓝的最大吸附量可达480.77mg/g。

Cu-BTC/GO metal-organic framework composite was prepared by a simple chemical method.The absorption effect of Cu-BTC/GO for methylene blue in aqueous solution was investigated.Cu-BTC/GO was characterized by scanning electron microscope (SEM),transmission electron microscopy (TEM),FT-IR spectroscopy (FT-IR),X-ray powder diffraction (XRD),thermogravimetric analysis (TG)and BET surface area.The effect of temperature,pH and the initial concentration of methylene blue were investigated.The results showed that when the pH of methylene blue solution was 7,125mg/L Cu-BTC/GO had excellent adsorption abilities in the 10mg/L methylene blue solution at 30℃.The adsorption isotherms followed Langmuir equation,and the dynamic data fitted pseudo-second order kinetic model well.When the pH of methylene blue solution was 7,the maximum adsorption capacity of Cu-BTC/ GO was 480.77mg/g at 30℃.