Construction of covalent-integrated MOFs@COFs composite material for efficient synergistic adsorption and degradation of pollutants

A novel MOFs@COFs Z-scheme heterojunction composite material was constructed by covalent bonds. The excellent visible light responsiveness and ideal band gap of photocatalysts promote the migration of photogenerated carriers. The larger specific surface area endows the photocatalyst with more active sites and excellent adsorption capacity. The photocatalyst can synergistically adsorb and degrade 100 ppm BPA in 10 mins under visible light condition with the fastest rate at present. • The construction of MOFs@COFs effectively broadens the light absorption range. • Unique structure brings abundant active sites and excellent adsorption capacity. • Photocatalyst synergistically adsorbs and degrades high-concentration of BPA. • Photocatalysis has excellent stability and wide applicability to other pollutants. • Covalent bonds and ideal band promote the transfer of photogenerated electron-hole. Titanium metal–organic frameworks (Ti-MOFs) are very attractive artificial photocatalysts for their good photo-redox activity. However, due to the poor visible light responsiveness of Ti-MOFs, the solar energy conversion efficiency is greatly limited. Herein, this paper adopts a covalent-integrated strategy to combine Ti-MOFs and covalent organic frameworks (COFs) with triazine frameworks through covalent bonding to construct MOFs@COFs Z-scheme heterojunction composite material. This material broadens the visible light response range and has suitable band gap and more active sites. It is noteworthy that composite material exhibits high synergistic adsorption and degradation performance for photocatalytic high concentration of bisphenol A (BPA). Thanks to the efficient photo-generating electron and hole transport, NM-125(Ti) 0.4 @TpTta-COF achieves synergistic adsorption and degradation of 100 ppm BPA within 10 mins, which is more efficient than other materials. Furthermore, this material exhibits high stability and universality, which provides a feasible strategy for designing and synthesizing photocatalytic materials with high light response.