Abstract:

The complexity of nuclear industry effluents necessitates novel treatment capable of facilitating water recycling and byproduct recovery. Many membrane-based technologies have become increasingly important for sewage water disposal because of their simple operation and scale-up for industrial applications. However, the membrane biofouling due to microbial attachment has become a serious issue, resulting in decreased removal efficiency for radionuclides and organic pollutants. Herein, by immobilizing the hybrid tannic acid (TA)/zero-valent iron (ZVI) nanostructures (TZ) onto the blow-spun amidoximed polyacrylonitrile (AOP)/zeolitic imidazolate framework-90 (ZIF-90) composite nanofibers, the ultimate AOP/ZIF-90@TA/ZVI (AZ@TZ) membranes with covalently cross-linked coatings were fabricated for synergistic adsorption-chemical reduction of uranium, photo-Fenton catalytic degradation of organic dyes, and ZVI/Zn2+-mediated resistance against bacterial cells. In order to assess the membrane's efficacy in eliminating uranium ions, a series of studies involving adsorption behavior were performed. The antibacterial and antifouling tests were further carried out using typical bacteria and organic dyes. The AZ@TZ hybrid membranes exhibited high uptake kinetics and the elimination capacity of uranium (140.06 mg/g) at pH 5.0, as well as excellent properties for photodegradation of organic dyes and inactivation of the bacteria within the biofilms. The novel integrated photo-Fenton and membrane-based technique offers fresh ideas for extremely effective radioactive sewage disposal.

全文链接：https://www.sciencedirect.com/science/article/pii/S0011916423000930