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 (H₂O₂) are adsorbed into the voids of the FeCD-MOF and the cavities of the CD. This process increases the concentration of micropollutants and H₂O₂ in the confined space, thereby significantly enhancing the efficiency of the Fenton catalytic reaction. Under a constant flux of 90 L/m²h and influent concentrations of 10 mg/L bisphenol A (BPA) and 3 mM H₂O₂, 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.