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A novel heat-treated humic acid/MgAl-layered double hydroxide composite for efficient removal of cadmium: Fabrication, performance and mechanisms
Applied Clay Science ( IF 5.3 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.clay.2020.105482
Miao Shi , Zhuanjun Zhao , Yiran Song , Miaomiao Xu , Jing Li , Liwei Yao

Abstract Heat-treated humic acid/MgAl-layered double hydroxide composite (HA/MgAl-LDH) was fabricated through a coprecipitation method and used as an adsorbent for the removal of Cd in aqueous solution. The composite was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) technique and X-ray photoelectron spectroscopy (XPS). These results indicated that the composite (HA/MgAl-LDH) had a rough surface, a large specific surface area and many functional groups. A series of experiments were conducted to ascertain the adsorption performance of HA/MgAl-LDH, including the additive amount of HA/MgAl-LDH, pH and ionic strength. The adsorption dynamics of HA/MgAl-LDH followed a pseudo-second-order model, suggesting that the process of Cd removal was chemical adsorption. Adsorption isotherms followed the Langmuir model of monolayer adsorption, and the maximum theoretical adsorption capacity calculated for Cd was 155.28 mg/g. Moreover, the adsorption mechanism of Cd was investigated by characterization and batch experimental analysis. Cd was absorbed on the surface of HA/MgAl-LDH by surface complexation and chelating interactions, and surface complexation was the main route of Cd removal. In addition, HA/MgAl-LDH has excellent treatment efficiency in actual wastewater. In short, HA/MgAl-LDH is a promising material for the removal of Cd from aqueous media because of its low cost, high efficiency, and easy operation.

中文翻译:

一种高效去除镉的新型热处理腐植酸/MgAl层状双氢氧化物复合材料:制备、性能和机制

摘要 通过共沉淀法制备了热处理腐植酸/MgAl层状双氢氧化物复合材料(HA/MgAl-LDH),并将其用作吸附剂去除水溶液中的Cd。通过扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDS)、傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET) 技术和 X射线光电子能谱 (XPS)。这些结果表明复合材料(HA/MgAl-LDH)具有粗糙的表面、大的比表面积和许多官能团。进行了一系列实验以确定HA/MgAl-LDH的吸附性能,包括HA/MgAl-LDH的添加量、pH和离子强度。HA/MgAl-LDH 的吸附动力学遵循准二级模型,表明去除 Cd 的过程是化学吸附。吸附等温线遵循Langmuir 单层吸附模型,计算出的Cd 最大理论吸附容量为155.28 mg/g。此外,通过表征和批量实验分析研究了Cd的吸附机理。Cd通过表面络合和螯合相互作用吸附在HA/MgAl-LDH表面,表面络合是去除Cd的主要途径。此外,HA/MgAl-LDH在实际废水中具有优异的处理效率。简而言之,HA/MgAl-LDH 具有成本低、效率高、操作方便等优点,是一种很有前途的去除水介质中 Cd 的材料。计算出的 Cd 最大理论吸附容量为 155.28 mg/g。此外,通过表征和批量实验分析研究了Cd的吸附机理。Cd通过表面络合和螯合相互作用吸附在HA/MgAl-LDH表面,表面络合是去除Cd的主要途径。此外,HA/MgAl-LDH在实际废水中具有优异的处理效率。简而言之,HA/MgAl-LDH 具有成本低、效率高、操作方便等优点,是一种很有前途的去除水介质中 Cd 的材料。计算出的 Cd 最大理论吸附容量为 155.28 mg/g。此外,通过表征和批量实验分析研究了Cd的吸附机理。Cd通过表面络合和螯合相互作用吸附在HA/MgAl-LDH表面,表面络合是去除Cd的主要途径。此外,HA/MgAl-LDH在实际废水中具有优异的处理效率。简而言之,HA/MgAl-LDH 具有成本低、效率高、操作方便等优点,是一种很有前途的去除水介质中 Cd 的材料。Cd通过表面络合和螯合相互作用吸附在HA/MgAl-LDH表面,表面络合是去除Cd的主要途径。此外,HA/MgAl-LDH在实际废水中具有优异的处理效率。简而言之,HA/MgAl-LDH 具有成本低、效率高、操作方便等优点,是一种很有前途的去除水介质中 Cd 的材料。Cd通过表面络合和螯合相互作用吸附在HA/MgAl-LDH表面,表面络合是去除Cd的主要途径。此外,HA/MgAl-LDH在实际废水中具有优异的处理效率。简而言之,HA/MgAl-LDH 具有成本低、效率高、操作方便等优点,是一种很有前途的去除水介质中 Cd 的材料。
更新日期:2020-03-01
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