Jevremović Anka, Savić Marjetka, Janošević Ležaić Aleksandra, Krstić Jugoslav, Gavrilov Nemanja, Bajuk-Bogdanović Danica, Milojević-Rakić Maja, Ćirić-Marjanović Gordana
Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia.
Vinča Institute of Nuclear Science, National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.
Polymers (Basel). 2023 Nov 7;15(22):4349. doi: 10.3390/polym15224349.
The environmental application of the carbonized composites of the Zn-containing metal-organic framework MOF-5 and polyaniline (PANI) in its emeraldine salt and base forms (C-(MOF-5/PANI)) was investigated for the first time. Textural properties and particle size distributions revealed that composites are dominantly mesoporous and nanoscale in nature, while Raman spectroscopy revealed the ZnO phase beneath the carbon matrix. Adsorption of pesticide, dye, and metal cation on C-(MOF-5/PANI) composites in aqueous solutions was evaluated and compared with the behavior of the precursor components, carbonized MOF-5 (cMOF), and carbonized PANIs. A lower MOF-5 content in the precursor, a higher specific surface area, and the pore volume of the composites led to improved adsorption performance for acetamiprid (124 mg/g) and Methylene Blue (135 mg/g). The presence of O/N functional groups in composites is essential for the adsorption of nitrogen-rich pollutants through hydrogen bonding with an estimated monolayer capacity twice as high as that of cMOF. The proton exchange accompanying Cd retention was associated with the Zn/Cd ion exchange, and the highest capacity (9.8 mg/g) was observed for the composite synthesized from the precursor with a high MOF-5 content. The multifunctionality of composites was evidenced in mixtures of pollutants where noticeably better performance for Cd removal was found for the composite compared to cMOF. Competitive binding between three pollutants favored the adsorption of pesticide and dye, thereby hindering to some extent the ion exchange necessary for the removal of metal cations. The results emphasize the importance of the PANI form and MOF-5/PANI weight ratio in precursors for the development of surface, porosity, and active sites in C-(MOF-5/PANI) composites, thus guiding their environmental efficiency. The study also demonstrated that C-(MOF-5/PANI) composites retained studied pollutants much better than carbonized precursor PANIs and showed comparable or better adsorption ability than cMOF.
首次研究了含锌金属有机框架MOF-5与呈翡翠盐和碱形式的聚苯胺（PANI）的碳化复合材料（C-(MOF-5/PANI)）在环境方面的应用。结构性质和粒度分布表明，复合材料本质上主要是中孔和纳米级的，而拉曼光谱揭示了碳基质下的ZnO相。评估了水溶液中农药、染料和金属阳离子在C-(MOF-5/PANI)复合材料上的吸附情况，并与前体成分、碳化MOF-5（cMOF）和碳化聚苯胺的行为进行了比较。前体中较低的MOF-5含量、较高的比表面积以及复合材料的孔体积导致对啶虫脒（124 mg/g）和亚甲基蓝（135 mg/g）的吸附性能得到改善。复合材料中O/N官能团的存在对于通过氢键吸附富氮污染物至关重要，其估计的单层容量是cMOF的两倍。伴随Cd保留的质子交换与Zn/Cd离子交换有关，由高MOF-5含量前体合成的复合材料具有最高容量（9.8 mg/g）。在污染物混合物中证明了复合材料的多功能性，与cMOF相比，该复合材料对Cd去除的性能明显更好。三种污染物之间的竞争性结合有利于农药和染料的吸附，从而在一定程度上阻碍了去除金属阳离子所需的离子交换。结果强调了前体中PANI形式和MOF-5/PANI重量比对于C-(MOF-5/PANI)复合材料表面、孔隙率和活性位点发展的重要性，从而指导其环境效率。该研究还表明，C-(MOF-5/PANI)复合材料对所研究污染物的保留比碳化前体聚苯胺要好得多，并且显示出与cMOF相当或更好的吸附能力。
Zotero 插件
