Nanoconfined bimetallic functionalized ceramic membrane with O3 micro-nano-bubbles for synergistic treatment of highly-salinity wastewater.

Nanoconfined Co, Cu-functionalized ceramic membrane (Co2Cu1/CM) were constructed to treat wastewater in the process of O3 micro-nano bubbles (MNBs). Co2Cu1/CM showed stable and effective synergistic performance in organic removal and membrane self-cleaning. The removal rate of NaOA within the membrane pores was 7.94 times higher than that on the membrane surface. The permeation flux of Co2Cu1/CM only decreased from 98.4 % to 94.3 % after three alkaline washing treatments. Furthermore, Co2Cu1/CM showed excellent performance in the five-cycle experiment. the COD removal rate for reverse osmosis concentrated (ROC) wastewater can reach >65 % and the permeation flux loss of Co2Cu1/CM is only 10 % after each cycle. The order of interference ability of co-existing ions on the removal of NaOA inhibitory ability was: H2PO4-> Cl-> HCO3-. MNBs and confinement effect improved the mass transfer in catalytic membrane couple with ozonation, and further enhanced the generation of ·OH and 1O2. Constructing metal active sites and the synergy effect of dual metal redox pairs accelerate the adsorption of O3 and the formation of reactive oxygen species (ROS). Co2Cu1/CM still showed remarkable pollution removal ability and low-cost investment in various ROC wastewater. This study providing a promising and cost-efficient nanoconfined catalytic membrane for the treatment of high-salinity organic wastewater.