Adsorption-enhanced Fenton catalytic membrane for high-efficiency, high-quality drinking water treatment.

To efficiently remove micropollutants from drinking water, this study developed an adsorption-enhanced Fenton catalytic membrane with a two-dimensional structure composed of graphene oxide loaded with iron-cyclodextrin metal-organic frameworks (FeCD-MOF). As water passes through the interlayer channels, micropollutants and hydrogen peroxide (HO) are adsorbed into the voids of the FeCD-MOF and the cavities of the CD. This process increases the concentration of micropollutants and HO in the confined space, thereby significantly enhancing the efficiency of the Fenton catalytic reaction. Under a constant flux of 90 L/mh and influent concentrations of 10 mg/L bisphenol A (BPA) and 3 mM HO, the membrane consistently maintained over 97.4 % BPA removal for 72 h. FeCD-MOF's excellent adsorption properties also enhance the stability of the treated water quality. Even with sudden increases in micropollutant concentration or interruptions in oxidant supply, the membrane maintained over 89.7 % BPA removal for an extended period solely through its adsorption capacity. Experimental results demonstrate that the membrane effectively removes various micropollutants, performs stably across a wide pH range, and resists interference from natural organic matter and ions, making it highly promising for drinking water treatment. Furthermore, compared to other MOF materials, FeCD-MOF has a significantly lower cost, enhancing its practicality.