ZIF-8@B-CNF复合气凝胶的制备及其吸附性能研究
收稿日期: 2023-03-06
网络出版日期: 2023-05-15
基金资助
国家自然科学基金(22178273); 天津制浆造纸重点实验室(天津科技大学)基金(202201)
Preparation and Adsorption Properties of ZIF-8@B-CNF Composite Aerogel
Received date: 2023-03-06
Online published: 2023-05-15
Supported by
National Natural Science Foundation of China(22178273); Foundation of Tianjin Key Laboratory of Pulp & Paper (Tianjin University of Science & Technology)(202201)
基于“纤维优先”的原则, 采用纤维素纳米纤丝(CNF)与金属有机骨架(MOF)制备复合材料. 采用1,2,3,4-丁烷四羧酸(BTCA)对CNF进行化学交联, 通过冷冻干燥处理制备气凝胶(B-CNF), 接着采用原位生长法在B-CNF表面负载沸石咪唑酯骨架结构材料(ZIF-8), 成功制备ZIF-8@B-CNF复合气凝胶, 并将其用于亚甲基蓝(MB)的吸附. 采用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)以及Brunner-Emmet-Teller (BET)等对ZIF-8@B-CNF复合气凝胶进行了表征, 对其吸附机理进行了研究. 结果表明, ZIF-8@B-CNF复合气凝胶具有低密度、高强度等优点, 当ZIF-8负载量为50%时, 其密度低于0.1 g•cm−3, 比表面积较CNF增加了14.5倍. 该复合气凝胶对MB表现出优异的吸附能力, 由Langmuir吸附模型得出其理论最大吸附量为352.59 mg•g−1, 吸附过程更符合准二级动力学模型, 属于化学吸附.
王凯晴 , 袁硕 , 徐王东 , 霍丹 , 杨秋林 , 侯庆喜 , 于得海 . ZIF-8@B-CNF复合气凝胶的制备及其吸附性能研究[J]. 化学学报, 2023 , 81(6) : 604 -612 . DOI: 10.6023/A23020049
Based on the principle of “fiber first”, cellulose nanofibrils (CNF) and metal-organic framework (MOF) are utilized to prepare composite material. The CNF with high dispersibility was prepared via MgCl2/succinic acid hydrolysis, sodium chlorite oxidation and high-pressure homogenization, then it was chemically cross-linked with 1,2,3,4-butane tetracarboxylic acid (BTCA) and freeze-dried in a mold for 4 h to obtain the aerogel. The aerogel was fully esterified at 170 ℃ for 2~3 min to obtain aerogel B-CNF, then Zn2+ and 2-methylimidazole were synthesized in-situ on its surface, finally, ZIF-8@B-CNF composite aerogel was successfully prepared. After that, the composite aerogel was used for the adsorption of methylene blue (MB), and the effects of adsorption conditions including adsorption time, MB concentration, pH values of the solution were discussed. The ZIF-8@B-CNF composite aerogel was characterized by SEM (scanning electron microscope), XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), XPS (X-ray photoelectron spectroscopy), BET (Brunner-Emmet-Teller), etc., and the adsorption behavior and adsorption mechanism of MB were researched. The results showed that the ZIF-8@B-CNF composite aerogel had the advantages of low density and high surface area. When the loading capacity of ZIF-8 came up to 50%, the density of the ZIF-8@B-CNF was as low as less than 0.1 g•cm−3, and its surface area were increased by 14.5 times compared with that of the CNF aerogel. The ZIF-8@B-CNF composite aerogel showed excellent adsorption capacity for the MB, its theoretical maximum adsorption capacity was as high as 352.59 mg•g−1 based on the Langmuir adsorption model, demonstrating that the composite aerogel had excellent adsorption capacity. The adsorption process was in accordance with the quasi-second-order kinetic model, which belonged to the chemisorption. In addition, the adsorption behavior of MB on the composite aerogel mainly depended on the effects of electrostatic interaction, π-π stacking and hydrogen bonding.
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