Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China.
South China Institute of Collaborative Innovation, Dongguan 221116, China.
J Hazard Mater. 2021 Sep 5;417:126011. doi: 10.1016/j.jhazmat.2021.126011. Epub 2021 May 5.
Treatment of textile water containing organic molecules as contaminants still remains a challenge and has become a central issue for environment remediation. Here, a nucleotide incorporated zeolitic imidazolate frameworks (NZIF) featuring hierarchically porous structure served as a potential adsorbent for removal of organic dye molecules. Adsorption isotherms of organic dyes were accurately described by Langmuir adsorption model with correlation coefficients of 0.98 and kinetic data followed the pseudo-second-order model. The maximum adsorption capacity of NZIF for Congo red (CR) and methylene blue (MB) reached 769 and 10 mg/g, respectively, which were 6 and 5 times higher than that of ZIF-8. The adsorption behavior of sunset yellow and crystal violet was examined for mechanism investigation. Analysis of pore size, molecular size, zeta potential and FTIR measurement together revealed that mesopores in NZIF provided more interaction sites and led to enhanced adsorption capacity. Hydrogen bonding and π-π stacking which resulted from the interaction between introduced nucleotide monophosphate and dyes dominated the driving forces for adsorption, where electrostatic interaction was also involved. Moreover, the introduced nucleoside monophosphate enabled NZIF to function under acidic condition whereas ZIF-8 collapsed. This study opens a new avenue for design of porous materials for environment remediation.
处理含有机分子的纺织废水仍然是一个挑战，已成为环境修复的核心问题。在这里，具有分级多孔结构的含核苷酸的沸石咪唑酯骨架（NZIF）作为一种潜在的吸附剂，用于去除有机染料分子。有机染料的吸附等温线可以通过 Langmuir 吸附模型准确描述，相关系数为 0.98，动力学数据遵循拟二级模型。NZIF 对刚果红（CR）和亚甲基蓝（MB）的最大吸附容量分别达到 769 和 10mg/g，分别是 ZIF-8 的 6 倍和 5 倍。为了探究吸附机制，考察了日落黄和结晶紫的吸附行为。通过孔径分析、分子尺寸、动电电位和 FTIR 测量的综合分析表明，NZIF 中的中孔提供了更多的相互作用位点，从而提高了吸附容量。引入的核苷酸单磷酸与染料之间的相互作用导致了氢键和π-π堆积，这是吸附的主要驱动力，其中还涉及静电相互作用。此外，引入的核苷单磷酸使 NZIF 能够在酸性条件下发挥作用，而 ZIF-8 则会崩溃。这项研究为环境修复用多孔材料的设计开辟了新途径。
