School of Life Sciences, Qufu Normal University, Qufu, 273165, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Aug;30(37):87899-87912. doi: 10.1007/s11356-023-28601-x. Epub 2023 Jul 11.
Zeolitic imidazolate framework/carbon nanotube (ZIF-67/CNTs) was prepared by precipitation method. ZIF-67/CNTs maintained the characteristics of large specific surface area and high porosity of ZIFs, showing stable cubic structure. The adsorption capacities of ZIF-67/CNTs for Cong red (CR), Rhodamine B (RhB) and Cr(VI) were 36.82 mg/g, 1421.29 mg/g and 716.67 mg/g under the conditions of 2:1, 3:1 and 1:3 masses of ZIF-67 and CNTs, respectively. The optimum adsorption temperature of CR, RhB and Cr(VI) were 30 °C, and the removal rates at the adsorption equilibrium were 81.22%, 72.87% and 48.35%. The adsorption kinetic model of the three adsorbents on ZIF-67/CNTs was consistent with the quasi-second order reaction model, and the adsorption isotherms were more consistent with adsorption law of Langmuir. The adsorption mechanism for Cr(VI) was mainly electrostatic interaction, and the adsorption mechanism for azo dyes was the combination of physical and chemical adsorption. This study would provide theoretical basis for further developing metal organic framework (MOF) materials for environmental applications.
沸石咪唑酯骨架/碳纳米管（ZIF-67/CNTs）采用沉淀法制备。ZIF-67/CNTs 保持了 ZIFs 具有大比表面积和高孔隙率的特点，呈现稳定的立方结构。在 ZIF-67 和 CNTs 的质量比为 2:1、3:1 和 1:3 的条件下，ZIF-67/CNTs 对刚果红（CR）、罗丹明 B（RhB）和 Cr(VI)的吸附容量分别为 36.82、1421.29 和 716.67 mg/g。CR、RhB 和 Cr(VI)的最佳吸附温度均为 30°C，吸附平衡时的去除率分别为 81.22%、72.87%和 48.35%。三种吸附剂在 ZIF-67/CNTs 上的吸附动力学模型均符合准二级反应模型，吸附等温线更符合 Langmuir 吸附规律。Cr(VI)的吸附机制主要是静电相互作用，偶氮染料的吸附机制是物理和化学吸附的结合。本研究为进一步开发金属有机骨架（MOF）材料在环境中的应用提供了理论依据。
