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

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• 作者：Ya-ling LONG^a ; Jin-gang YU^a ; Fei-peng JIAO^a ; ^{jiaofp@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wei-jie YANG^b
• 关键词：layered double hydroxide ; multi-walled carbon nanotube ; Congo red ; kinetic ; thermodynamic ; isotherm
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：26
• 期：10
• 页码：2701-2710
• 全文大小：2867 K

文摘

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 m²/g) and great pore volume (0.604 cm³/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.