Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
J Colloid Interface Sci. 2021 Jul 15;594:398-408. doi: 10.1016/j.jcis.2021.03.065. Epub 2021 Mar 18.
Dye-contaminated wastewater resulting from rapid industrialization and urbanization is a global problem. In this study, a ZIF-8@Fe/Ni sample was synthesized for the removal of malachite green (MG), removing more than 99% of an initial MG concentration of 50 mg L within 120 min with a 318 K adsorption capacity of 151.520 mg g. To understand the dye removal mechanism based on adsorption and reduction, ZIF-8@Fe/Ni was characterized by various techniques. XRD showed that the ZIF-8@Fe/Ni composite had a characteristic peak attributable to Fe/Ni around 44.8°, where the presence of Fe/Ni did not affect the structure of ZIF-8. SEM confirmed that ZIF-8@Fe/Ni was successfully prepared, while XRD and FTIR revealed that the structure of ZIF-8@Fe/Ni remained stable following the introduction of Fe/Ni. XPS showed that while Fe/Ni nanoparticles existed in ZIF-8-Fe/Ni, partial oxidation also occurred. GC-MS demonstrated the creation of two major MG degradation products, (4-aminophenyl) (phenyl) methanone and 4-aminophenol. While the overall adsorption process of MG to ZIF-8@Fe/Ni conformed to pseudo-second-order kinetics, degradation followed pseudo-first-order reduction kinetics. When applied to the remediation of wastewater, ZIF-8@Fe/Ni removed 92% of MG. Overall, this study demonstrated that ZIF-8@Fe/Ni could be a promising material for the treatment of wastewater.
染料污染废水是工业化和城市化快速发展带来的全球性问题。本研究合成了 ZIF-8@Fe/Ni 用于去除孔雀石绿（MG），在 318 K 时，对初始浓度为 50 mg/L 的 MG 废水在 120 min 内去除率超过 99%，吸附容量为 151.520 mg·g。为了理解基于吸附和还原的染料去除机制，采用多种技术对 ZIF-8@Fe/Ni 进行了表征。XRD 表明 ZIF-8@Fe/Ni 复合材料具有约 44.8°的 Fe/Ni 特征峰，表明 Fe/Ni 的存在并不影响 ZIF-8 的结构。SEM 证实了 ZIF-8@Fe/Ni 的成功制备，而 XRD 和 FTIR 表明 ZIF-8@Fe/Ni 的结构在引入 Fe/Ni 后保持稳定。XPS 表明 Fe/Ni 纳米颗粒存在于 ZIF-8-Fe/Ni 中，同时也发生了部分氧化。GC-MS 表明 MG 有两个主要的降解产物，（4-氨基苯基）（苯基）甲酮和 4-氨基酚。尽管 MG 对 ZIF-8@Fe/Ni 的整体吸附过程符合伪二级动力学，但降解遵循伪一级还原动力学。当应用于废水修复时，ZIF-8@Fe/Ni 去除了 92%的 MG。总的来说，本研究表明 ZIF-8@Fe/Ni 可能是一种有前途的废水处理材料。
