State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo 315211, PR China; State Key Laboratory of Food Contact Material Testing, Ningbo Academy of Inspection and Quarantine, Ningbo 315048, PR China; College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315211, PR China.
State Key Laboratory of Food Contact Material Testing, Ningbo Academy of Inspection and Quarantine, Ningbo 315048, PR China.
Int J Biol Macromol. 2022 Apr 30;205:473-482. doi: 10.1016/j.ijbiomac.2022.02.120. Epub 2022 Feb 21.
In this study, a method for the in situ growth of zeolitic imidazolate framework-8 (ZIF-8) on carboxymethyl chitosan beads (BCMC) to produce a composite adsorbent (BCMC@ZIF-8) for the removal of Pb from water is proposed. The results revealed that the utilization of the BCMC as a framework enhanced the stability of ZIF-8, and the presence of the latter in the composite improved the removal efficiency of Pb from water. Data from X-ray photoelectron spectroscopy analysis and adsorption kinetics revealed that the adsorption mechanism included diffusion and the sharing/transfer of electrons between BCMC@ZIF-8 and Pb. The maximum adsorption capacity of BCMC@ZIF-8 fitted using the Langmuir model was 566.09 mg/g. Results of the experiments on the regeneration of the adsorbent and its stability in water further indicated that BCMC improved the stability of ZIF-8. This study demonstrated that the stability of metal-organic framework (MOF) materials, which exhibited high efficiencies for the removal of heavy metals in water can be improved through fixation of the polymer skeleton. Thus, the present study offers practical and theoretical guidance for the application of MOF materials in water treatment.
在这项研究中，提出了一种在羧甲基壳聚糖珠（BCMC）上原位生长沸石咪唑酯骨架-8（ZIF-8）的方法，以制备用于从水中去除 Pb 的复合吸附剂（BCMC@ZIF-8）。结果表明，将 BCMC 用作骨架可以提高 ZIF-8 的稳定性，而后者在复合材料中的存在可以提高从水中去除 Pb 的效率。X 射线光电子能谱分析和吸附动力学数据表明，吸附机制包括扩散以及 BCMC@ZIF-8 和 Pb 之间的电子共享/转移。使用 Langmuir 模型拟合的 BCMC@ZIF-8 的最大吸附容量为 566.09 mg/g。对吸附剂的再生实验及其在水中的稳定性的结果进一步表明，BCMC 提高了 ZIF-8 的稳定性。本研究表明，通过固定聚合物骨架，可以提高金属-有机骨架（MOF）材料对水中重金属去除的效率和稳定性。因此，本研究为 MOF 材料在水处理中的应用提供了实用和理论指导。
