School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, People's Republic of China.
Clinical Laboratory Medicine, Henan Medical College, Zhengzhou, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Jan;30(2):3383-3401. doi: 10.1007/s11356-022-22303-6. Epub 2022 Aug 10.
The layered double hydroxides (LDHs) have attracted attention in the water treatment field. In this paper, three novel ternary Zn-Co-Ni-LDH adsorbents were prepared successfully through rational construction from 2D to 3D using triethanolamine (TEA) as an alkali source and a structural controlling reagent by hydrothermal technique. Samples were characterized by the SEM, XRD, XPS, FTIR, BET, solid-state UV/vis spectra, and TG. Three Zn-Co-Ni-LDHs exhibited higher crystallinity and surface area which were beneficial to the adsorption for methyl orange (MO). The maximum adsorption capacity of three Zn-Co-Ni-LDH adsorbents can even reach as high as 1871.65 mg·g, 1799.56 mg·g, and 1646.44 mg·g for MO, respectively, which surpass those of most previously reported LDH-based adsorbents. The pseudo-second-order kinetic equation fitted the kinetic data of adsorption, while the equilibrium adsorption isotherm data followed the Langmuir model. The adsorption mechanism, electrochemical, and the antibacterial properties of three Zn-Co-Ni-LDHs were also discussed. This results not only demonstrates that three Zn-Co-Ni-LDHs are practical interest as an efficient adsorbent for the removal of MO from dye waste water, but also provides a strategy for the rational design through three ternary Zn-Co-Ni-LDHs from 2D to 3D.
层状双氢氧化物（LDHs）在水处理领域引起了关注。本文通过水热技术，使用三乙醇胺（TEA）作为碱源和结构控制试剂，成功地从二维到三维合理构建了三种新型三元 Zn-Co-Ni-LDH 吸附剂。通过 SEM、XRD、XPS、FTIR、BET、固态 UV/vis 光谱和 TG 对样品进行了表征。三种 Zn-Co-Ni-LDH 表现出更高的结晶度和表面积，有利于对甲基橙（MO）的吸附。三种 Zn-Co-Ni-LDH 吸附剂对 MO 的最大吸附容量甚至可高达 1871.65、1799.56 和 1646.44 mg·g-1，超过了大多数先前报道的基于 LDH 的吸附剂。吸附动力学数据符合拟二级动力学方程，而平衡吸附等温线数据符合 Langmuir 模型。还讨论了三种 Zn-Co-Ni-LDH 的吸附机理、电化学和抗菌性能。这些结果不仅表明三种 Zn-Co-Ni-LDH 作为一种从染料废水中去除 MO 的高效吸附剂具有实际意义，而且还为通过从二维到三维的三种三元 Zn-Co-Ni-LDH 进行合理设计提供了一种策略。
