Facile synthesis of hierarchical porous ZIF-8@TiO2 for simultaneous adsorption and photocatalytic decomposition of crystal violet

Abstract In this study, a facile one-pot method was developed to create hierarchical porous M−ZIF−8 by utilizing NaOH as a defecting agent. The as-synthesized material comprising macroporous and mesoporous and exhibits hierarchical porosity. TiO2 (anatase) with different mass ratios (5%, 15%, and 25%) were immobilized into M−ZIF−8 to combine the synergism of adsorption and photocatalytic oxidation. Five percent of TiO2 immobilized in M−ZIF−8 gave the best adsorption and photocatalytic degradation. The adsorption kinetics and isotherms of CV on M−ZIF−8 were also evaluated to validate the adsorption capability of M−ZIF−8. After four consecutive experiments, the adsorption and photocatalytic performance of M−ZIF−8@TiO2 to degrade CV slightly decreased.