High-Conversion Microreactor for Hydrogenation of Organic Waste

Here, a microchannel reactor based on polytetrafluoroethylene (PTFE) capillary was successfully constructed and catalyzed 4-nitrophenol (4-NP) stably and efficiently. The reactor is based on inexpensive PTFE capillary tubes, and polydopamine is adsorbed on the inner wall of the capillary tubes by utilizing its super adhesive property. Then, the uniform and stable loading of palladium nanoparticles on the multilayer hybridized membrane is achieved in the microchannel by continuous flow using layer-by-layer self-assembly, ion exchange, and in situ reduction. Under the condition of low catalyst loading, the conversion rate of high concentration 4-NP (0.5 mM) wastewater was maintained above 98 % for 360 h, which demonstrated the excellent catalytic efficiency and good stability of the microchannel reactor. In addition, the microreactor has excellent universality. This study provides a new way to treat organic wastewater efficiently and finely.