Preparation and properties of WSCR&IL-PVDF organic-inorganic ultrafiltration membrane
The selective catalytic reduction denitrification catalyst(SCR catalyst)will adsorb harmful substances during its operation,which will be discharged along with the waste catalyst and contaminate the surrounding environment.In 2014,the Ministry of Environmental Protection classified this SCR catalyst as hazardous waste,and included it in the list of hazardous waste in 2016.In this study,the waste SCR catalyst was recovered from an air treatment enterprise.Then it was combined with an ionic liquid to obtain a highly efficient antibacterial agent.Subsequently,the phase conversion method was used to prepare the organic-inorganic ultrafiltration membrane with high water flux by blending the antibacterial agent with polyvinylidene fluoride.The hydrophilicity,surface morphology,and water flux of the membranes were investigated through measurements of surface contact angle,scanning electron microscopy(SEM),atomic force microscopy(AFM),and low-pressure filtration experiments.Furthermore,their anti-fouling and antibacterial properties were characterized.The maximum water flux was 498.96 L·(m2·h)-1 with a high antibacterial rate of 91.5％.Additionally,the water flux recovery rate increased to 79.79％,and the anti-fouling performance was further enhanced.The waste SCR catalyst is integrated with the membrane,thereby enhancing membrane performance and promoting resource recycling,aligning with the principles of green development.
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