Cu-BTC-SiO_2材料的制备及其对亚甲基蓝的吸附性能

利用原位合成法,将Cu-BTC负载到介孔/大孔二氧化硅孔道中,获得介孔Cu-BTC-SiO_2材料.研究在不同温度、亚甲基蓝浓度、pH值下Cu-BTC-SiO_2对亚甲基蓝吸附效果的影响,并对其吸附动力学及其吸附热力学数据进行分析.结果表明,该样品对亚甲基蓝的吸附符合Langmuir吸附等温模型和准一级动力学模型,其最佳条件为反应温度25℃,染料质量浓度为5mg/L,pH值为5.热力学研究发现,在25~45℃内,亚甲基蓝在Cu-BTC-SiO_2上的吸附行为是放热过程而且是自发进行的.

Preparation of Cu-BTC-SiO2 and its adsorption properties for methylene blue

Cu-BTC-SiO2 was prepared by loading Cu-BTC into the mesoporous silica using in-si-tu synthesis method .The effects of Cu-BTC-SiO2 on the adsorption of methylene blue at differ-ent temperatures ,different methylene blue concentrations and different pH values were stud-ied .At the same time ,the adsorption kinetics and adsorption thermodynamics data were ana-lyzed .The results show that the adsorption of methylene blue on the sample is in accordance with Langmuir adsorption isotherm model and quasi-first order kinetic model .The optimum re-action temperature is 25 ℃ ,the dye concentration 5 mg/L ,and the optimum pH value 5 .The thermodynamic study finds that the adsorption behavior of methylene blue on Cu-BTC-SiO2 is a spontaneous and exothermic process at the temperature between 25 ～ 45 ℃ .