WSCR&IL-PVDF有机-无机超滤膜的制备及性能

Preparation and properties of WSCR&IL-PVDF organic-inorganic ultrafiltration membrane

选择性催化还原法脱硝催化剂在使用过程中会吸附有害物质,这些有害物质随废催化剂排出,也会对周围环境造成污染,环保部在2014年将其列为危险废物,并在2016年将其纳入危险废物名录。该研究从大气处理企业回收废旧选择性催化还原法脱硝催化剂,将之与离子液体结合得到高效抗菌剂,随后利用相转化的方法将抗菌剂与聚偏氟乙烯共混制备得到高水通量的有机-无机超滤膜。通过表面接触角的测定、扫描电子显微镜、原子力显微镜、低压过滤实验研究了膜的亲疏水性、表面形貌和水通量大小,并对其抗污和抗菌性能进行了表征,最优配比膜M5的水通量为498.96 L·(m^(2)·h)^(−1),抗菌率达到91.5%,水通量恢复率提高至74.17%,抗污性能进而提高。将废旧选择性催化还原法脱硝催化剂与膜相结合,提高膜性能的同时能够资源再利用,践行绿色发展理念。

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·(m^(2)·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.