纳米片状高结晶度镁铝水滑石的合成及其对水溶液中Cu2+的吸附性能

Nai-Cai Xu, Dan-Dan Shi, Ying Zhang, Kai-Peng Zhong, Jing Liu, Qi Zhao, Qiang Gao, Shao-Ju Bian
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引用次数: 0

摘要

采用均相沉淀法和水热法制备了具有纳米层状形貌的镁铝层状双氢氧化物(Mg-Al LDH),并得到了镁铝层状双氢氧化物的煅烧产物(Mg-Al LDO)。采用XRD、TEM、SEM、FTIR、N2 ad/解吸、TG-DTG等技术对两种材料的微观结构、形貌和热稳定性进行了详细表征。结果表明,镁铝LDH和镁铝LDO均具有介孔结构和纳米板形貌,直径为50~200 nm;在773 K的空气气氛中,Mg-Al LDH转化为Mg-Al LDO。以氯化铜溶液为模拟废物,系统地研究了镁铝LDH的吸附性能。实验结果表明,溶液的pH值对其Cu2+吸附量有明显影响,最佳pH值为5.0左右。吸附动力学结果表明,mg - al LDH吸附速度快,平衡吸附容量为62.11 mg/g。此外,对Cu2+的吸附可以用伪二阶模型很好地描述,表明吸附行为受化学吸附的调节。吸附热力学结果表明,在318k以上的温度下,吸附过程是自发的。ΔG0值随着温度的升高而减小,说明温度越高,吸附Cu2+的动力越大。此外,ΔH0的正值表明Cu2+的吸附是吸热的,而ΔS0的正值表明吸附剂固液界面的混乱度增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis of High-Crystallinity Mg-Al Hydrotalcite with a Nanoflake Morphology and Its Adsorption Properties for Cu2+ from an Aqueous Solution
A magnesium–aluminum-layered double hydroxide (Mg-Al LDH) with a nano-lamellar morphology was prepared by using a homogeneous precipitation and hydrothermal method, and a calcination product (Mg-Al LDO) of the Mg-Al LDH was also obtained in this work. The XRD, TEM, SEM, FTIR, N2 ad/desorption, and TG-DTG techniques were employed to characterize the microstructures, morphologies, and thermostability levels of these two materials in detail. The results showed that both the Mg-Al LDH and Mg-Al LDO had mesoporous structures and nanoplate morphologies, with diameters of 50~200 nm. The Mg-Al LDH was transformed into Mg-Al LDO at 773 K in an air atmosphere. The adsorption properties of the Mg-Al LDH were investigated systematically with a copper chloride solution as a simulated waste. The experimental results demonstrated that the pH value of the solution had an obvious influence on its Cu2+ adsorption capacity, and the optimal pH value was approximately 5.0. The adsorption kinetics results showed that the Mg-Al LDH had a rapid adsorption rate, and the equilibrium adsorption capacity was 62.11 mg/g. Additionally, the Cu2+ adsorption could be commendably described using a pseudo-second-order model, demonstrating that the adsorption behavior is regulated by chemical sorption. The adsorption thermodynamic results indicated that the adsorption process was spontaneous at temperatures above 318 K. Moreover, the ΔG0 values decreased as the temperature was raised, which indicated that a higher temperature can cause a greater impetus for Cu2+adsorption. In addition, the positive values of the ΔH0 indicated that the Cu2+ adsorption was endothermic, and the positive ΔS0 values revealed an increase in the confusion at the solid–liquid interface of the adsorbent.
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