Preparation and characterization of MWCNTs/LDHs nanohybrids for removal of Congo red from aqueous solution  

多壁碳纳米管/层状双金属氢氧化合物杂化材料的制备和表征及其对刚果红废水的吸附性能（英文）

作　　者：龙娅玲 于金刚[1] 焦飞鹏[1] 杨伟杰[2] 

机构地区：[1]中南大学化学化工学院,长沙410083 [2]周口师范学院化学化工学院,周口466000

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第10期2701-2710,共10页中国有色金属学报（英文版）

基　　金：Project(21476269)supported by the National Natural Science Foundation of China;Project(14JJ2014)supported by Natural Science Foundation of Hunan Province,China

摘　　要：The assembly of layered double hydroxides （LDHs） and multi-walled carbon nanotubes （MWCNTs） nanohybrids was prepared as MWCNTs/LDHs by co-precipitation. The synthesized nanoparticles were characterized by using XRD, FT-IR, SEM/EDX, TGA and BET. XRD and SEM studies proved that MWCNTs phases did not enter into the interlayers of LDHs, they dispersed over the LDHs surface homogeneously. BET results showed that MWCNTs/LDHs possessed hierarchically porous nanostructure with large surface area （124.974 m^2/g） and great pore volume （0.604 cm^3/g）. Batch experiments were conducted to study the adsorption efficiency of Congo red （CR）. It was worthy to note that MWCNTs/LDHs exhibited excellent adsorption performance with the maximum CR adsorption capacity of 595.8 mg/g in weak acidic environment. The adsorption kinetics and isotherm parameters can be well described by the pseudo-second-order and the Langmuir isotherm models, respectively. The thermodynamic studies indicated that the adsorption process was spontaneous and endothermic.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。

关 键 词：layered double hydroxide multi-walled carbon nanotube Congo red kinetic THERMODYNAMIC ISOTHERM 

分 类 号：X788[环境科学与工程—环境工程] O647.33[理学—物理化学]