Catalytic degradation is one of the effective methods for treating organic polluted wastewater. In recent years, metal-organic frameworks (MOFs, Metal-organic frameworks) have become a new type of catalytic materials for removing organic pollutants due to their high surface area, adjustable pore structure and many active sites. However, many of the new MOFs composite materials that have been reported so far are not ideal for large-scale preparation and sustainable and industrial applications due to processability, water stability, and recyclability. Therefore, combining MOFs with carrier materials and constructing new MOFs functional devices will help improve performance and expand their practical applications.

Based on this, the team of Wang Xiaolong, a researcher from the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, and the team of Associate Professor Zhou Lincheng of Lanzhou University, combined with the advantages of 3D printing technology in the field of complex device construction and free design, manufacturing and molding, carried out 3D printing MOFs modified porous ceramics Research on catalytic materials and devices for the catalytic degradation of organic pollutants in water (Figure 1)

Figure 1 3D printed MOFs loaded porous ceramics and catalytic degradation of organic matter polluted water treatment

As shown in Figure 2, the researchers first developed a 3D printed ceramic ink composed of aluminum phosphate sol (AP), hydrophilic gas phase SiO2 and polystyrene microspheres (PS), where PS microspheres were used to adjust the 3D printed ceramics Porosity; then, it is extruded with ink direct writing (DIW) 3D printing technology, and obtained a high-precision three-dimensional multi-level porous ceramic skeleton after calcination at high temperature; finally, through polydopamine surface modification and hydrothermal treatment technology, MOFs particles were grown in situ on a 3D printed multi-stage porous ceramic skeleton to prepare a 3D printed multi-stage porous catalyst modified with MOFs with structural adjustability, high catalytic activity, long-term stability, and ease of deviceization.

Figure 2 Schematic diagram of 3D printed multi-level porous ceramics prepared by MOFs in-situ growth strategy

The obtained porous ceramics with MOFs have both multi-scale pore structures such as MOFs and nano-micro-millimeters. Not only do they have high surface area, they are not only suitable for organic dyes Methylene blue (MB), Rhodamine B (Rh B), Malachite green (MG) and Crystal violet (CV) and other simulated organic pollutants show excellent catalytic performance, and have good permeability and high water treatment efficiency. With the advantages of 3D printing in design and manufacturing, the researchers designed and constructed ceramic skeletons with different structures, and optimized the structure and catalytic performance of ceramic catalytic materials. At the same time, the researchers used 3D printing technology to easily implement various types of catalytic reaction devices, such as the 3D printed catalytic filter and the 3D printed impeller agitator shown in Figure 3. The obtained device has good catalytic degradation effect of organic dyes and can be reused, indicating that 3D printed MOFs modified porous catalytic materials and devices have good application potential and engineering significance in actual wastewater treatment.

Figure 3 3D printed MOFs@ porous ceramic catalytic filter, impeller mixer and application display

The above results were recently published online in the international journal Chemical Engineering Journal (DOI: 10.1016/j.cej.2020.125392). The co-first authors of the paper are Liu Desheng, a master student of Lanzhou University, and Jiang Pan, a PhD student of Lanzhou Institute of Chemistry, and the corresponding authors are Associate Professor Zhou Lincheng of Lanzhou University and Researcher Wang Xiaolong of Institute of Lanzhou Institute of Chemistry. The research work was supported by the National Natural Science Foundation of China and major special science and technology programs in Gansu Province.







Source of information: MOFs online

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