Zhu Wenkai, Han Minsu, Kim Donggyun, Zhang Yang, Kwon Goomin, You Jungmok, Jia Chong, Kim Jeonghun
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China; Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Environ Res. 2022 Apr 1;205:112417. doi: 10.1016/j.envres.2021.112417. Epub 2021 Nov 29.
Sulfate radical (SO)-based advanced oxidation processes (SR-AOPs) have recently attracted much attention due to their potential in degrading organic pollutants. Metal-organic frameworks (MOFs) have been reported as effective materials to generate SO. However, it is challenging to separate and recover the dispersed MOF particles from the reaction solution when MOFs are used alone. We used cellulose nanofibers (CNFs) as a porous filter template to immobilize Zn-based MOF, zeolitic imidazolate framework-8 (ZIF-8), and obtained a catalytic composite membrane having peroxymonosulfate (PMS) activating function to produce SO. The CNF was effective in holding ZIF-8 nanoparticle and making a durable porous filter. The activated PMS-produced OH and SO radicals from ZIF-8 play an important role in the catalytic reaction. More than 90% of methylene blue and rhodamine B was degraded by ZIF-8/CNFs composite membrane in the PMS environment within 60 min. The ZIF-8/CNFs catalytic filters can be used several times without performance reduction for organic dye degradation. The results show that ZIF-8/CNFs catalytic membrane can be separated from organic pollution system quickly and used for the efficient separation and recovery of MOF particle-based catalytic materials. Therefore, this study provides a new perspective for fabricating the MOFs particles-immobilized catalytic filter by biomass nanocellulose-based materials for water purification. This method can be used for facile fabrication of the cellulose-based porous functional filter and open diverse applications.
基于硫酸根自由基（SO）的高级氧化工艺（SR-AOPs）由于其在降解有机污染物方面的潜力，近年来备受关注。金属有机框架材料（MOFs）已被报道为产生SO的有效材料。然而，单独使用MOFs时，从反应溶液中分离和回收分散的MOF颗粒具有挑战性。我们使用纤维素纳米纤维（CNFs）作为多孔过滤模板来固定锌基金属有机框架材料沸石咪唑酯骨架结构-8（ZIF-8），并获得了具有过一硫酸盐（PMS）活化功能以产生SO的催化复合膜。CNF在固定ZIF-8纳米颗粒和制造耐用的多孔过滤器方面很有效。ZIF-8产生的经PMS活化生成的羟基自由基和硫酸根自由基在催化反应中起重要作用。在PMS环境中，ZIF-8/CNFs复合膜在60分钟内可降解90%以上的亚甲基蓝和罗丹明B。ZIF-8/CNFs催化过滤器可重复使用多次，且对有机染料降解的性能不会降低。结果表明，ZIF-8/CNFs催化膜可快速从有机污染体系中分离出来，并用于基于MOF颗粒的催化材料的高效分离和回收。因此，本研究为利用生物质纳米纤维素基材料制备用于水净化的MOFs颗粒固定化催化过滤器提供了新的视角。该方法可用于简便制备纤维素基多孔功能过滤器，并开拓多种应用。
