A facile in situ interfacial construction strategy of hierarchically distributed mixed-metal layered hydroxide/cellulose membranes towards efficient wastewater purification

Abstract

Layered metal hydroxides have attracted much attention because of their excellent photocatalytic performance, but it is still a great challenge to realize the efficient preparation and distributed manipulation of mixed-metal layered hydroxide (MMLH) photocatalyst materials under mild conditions. Herein, a facile cellulose-enabled in situ interfacial reaction strategy was developed to construct hierarchically distributed MMLH/cellulose catalytic membranes towards efficient wastewater purification. The as-prepared membranes possessed superior water evaporation efficiency and catalytic degradation capability on pollutants, resulting in an excellent water evaporation rate of 1.58 kg m⁻² h⁻¹ and high degradation efficiency up to 100%, 89.7% and 90.9% in rhodamine B (200 mg L⁻¹), bisphenol A (40 mg L⁻¹) and oxytetracycline (40 mg L⁻¹) environments, respectively. Trinity excellence in degradation efficiency, reaction time, and the treatment concentration of pollutants was achieved with the present systems. Thus, this study establishes a potential solar-driven water evaporation/photo-Fenton system via bi-functional MMLH-based catalytic membranes for high-efficiency wastewater purification.