Integrating surface corrosion and imprinting strategy into PEDOT/Bi12O17Cl2 heterojunction embedded membrane aims to high permeability and selectivity

Abstract

Development of photocatalytic membrane with antifouling, permeability, selectivity and reusability is highly desired for water treatment. Herein, an imprinted poly-3,4-ethylenedioxythiophene/oxygen-rich bismuth chloride oxide heterojunction embedded membrane (I-PEDOT/Bi12O17Cl2−M) with good self-cleaning and recyclability was fabricated by integrating surface corrosion and imprinting strategy. The introduction of imprinting technology endowed Z-type heterojunction (composed of Bi12O17Cl2 nanosheets and PEDOT) with imprinted cavities which possessed good selective adsorption ability for target pollutant (tetracycline, TC). Compared with pure nanosheets (Bi12O17Cl2) and non-imprinted nanosheets photocatalyst (NI-PEDOT/Bi12O17Cl2), the selectivity coefficient of I-PEDOT/Bi12O17Cl2−M were 3.35 and 2.01, respectively. Importantly, the corrosive solvent (NMP) changed the surface pore structure of polyvinylidene fluoride (PVDF), which firmly stuck the two-dimensional I-PEDOT/Bi12O17Cl2 in the surface pore of PVDF base membrane, avoiding the catalyst encapsulation issue of conventional methods and fully exposing the active sites. Therefore, I-PEDOT/Bi12O17Cl2−M exhibited good catalytic activity and stability. Particularly, the pure water flux and TC flux reached 4620 L/m2·h and 3580 L/m2·h, respectively. This study provides a new strategy for reasonable design of photocatalytic membrane with high permeability and good selectivity.