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通过共沉淀法将多壁碳纳米管组装到层状双氢氧化物表面,得到新型杂化材料多壁碳纳米管/层状双金属氢氧化合物(MWCNTs/LDHs)。采用XRD、FT-IR、SEM/EDX、TGA和BET对合成材料进行表征。XRD与SEM研究表明,MWCNTs未进入LDHs层内,而是均匀地分布在LDHs层状表面。BET结果表明,MWCNTs/LDHs是具有高比表面积(124.974 m~2/g)和大孔体积(0.604 cm~3/g)的多孔材料。采用批次实验法研究MWCNTs/LDHs对染料刚果红的吸附效果。值得注意的是,在弱酸溶液环境下MWCNTs/LDHs对刚果红的最大吸附量达到595.8 mg/g,表现出优异的吸附性能。通过对吸附所得数据进行热力学及动力学拟合,发现吸附过程符合Langmuir吸附,且符合准二级动力学模型;由所得热力学数据可知,吸附过程为自发及吸热过程。
Multi-walled carbon nanotubes (MWCNTs / LDHs) were synthesized by co-precipitation of multiwalled carbon nanotubes onto the surface of layered double hydroxides. The synthesized materials were characterized by XRD, FT-IR, SEM / EDX, TGA and BET. XRD and SEM studies showed that MWCNTs did not enter the LDHs layer, but uniformly distributed on the LDHs layered surface. BET results showed that MWCNTs / LDHs were porous materials with high specific surface area (124.974 m 2 / g) and large pore volume (0.604 cm 3 / g). The batch experiment was used to study the adsorption of dye Congo red by MWCNTs / LDHs. It is noteworthy that MWCNTs / LDHs adsorbed on Congo red up to 595.8 mg / g in weak acid solution showed excellent adsorption performance. Through the thermodynamic and kinetic fitting of the data, we found that the adsorption process accords with the Langmuir adsorption and accords with the quasi-second-order kinetic model. From the obtained thermodynamic data, the adsorption process is spontaneous and endothermic.