Zhao Anjiu, Tang Qi, Chen Yuanlong, Qiu Chongpeng, Huang Xingyan
College of Forestry, Sichuan Agricultural University, Chengdu 611130, China.
Molecules. 2023 Sep 7;28(18):6499. doi: 10.3390/molecules28186499.
Zeolitic imidazolate frameworks (ZIFs) can be used as an adsorbent to efficiently adsorb organic pollutants. However, ZIF nanoparticles are easy to form aggregates, hampering the effective and practical application in practical adsorption. In this study, the ZIF-8 was successfully loaded onto lignocellulose (LC) to further produce ZnO/LC by in situ growth method and hydrothermal treatment, and then FeO nanoparticles (FeO NPs) were loaded onto ZnO/LC to prepare magnetic FeO/ZnO/LC adsorbent for removing tetracycline (TC) and congo red (CR) pollutants from aqueous solution. The adsorption properties of the adsorbent were systematically analyzed for different conditions, such as adsorbent dosage, solution pH, contact time, temperature and initial concentration. The experimental data were fitted using adsorption kinetic and isotherm models. The results showed that the pseudo-second-order model and Sips model were well fitted to the adsorption kinetic and adsorption isotherm, respectively. The adsorption capacities of TC and CR reached the maximum value of 383.4 mg/g and 409.1 mg/g in experimental conditions. The mechanism of the removal mainly includes electrostatic interaction, hydrogen bonding and π-π stacking. This novel adsorbent could be rapidly separated from the aqueous solution, suggesting its high potential to remove pollutants in wastewater.
沸石咪唑酯骨架材料（ZIFs）可作为吸附剂用于高效吸附有机污染物。然而，ZIF纳米颗粒容易形成聚集体，阻碍了其在实际吸附中的有效和实际应用。在本研究中，通过原位生长法和水热处理成功地将ZIF-8负载到木质纤维素（LC）上，进一步制备了ZnO/LC，然后将FeO纳米颗粒（FeO NPs）负载到ZnO/LC上，制备了磁性FeO/ZnO/LC吸附剂，用于从水溶液中去除四环素（TC）和刚果红（CR）污染物。系统分析了不同条件下（如吸附剂用量、溶液pH值、接触时间、温度和初始浓度）吸附剂的吸附性能。实验数据采用吸附动力学和等温线模型进行拟合。结果表明，准二级模型和Sips模型分别很好地拟合了吸附动力学和吸附等温线。在实验条件下，TC和CR的吸附容量分别达到最大值383.4 mg/g和409.1 mg/g。去除机理主要包括静电相互作用、氢键和π-π堆积。这种新型吸附剂可以从水溶液中快速分离，表明其在去除废水中污染物方面具有很高的潜力。
