Abstract
In this research, novel nanohybrid of zeolitic imidazolate framework supported cobalt tungstate semiconductor (ZIF-67@CoWO4) with various CoWO4 loading ratios (from 0 to 30 %wt) has been fabricated as a visible-light-driven photocatalyst for dibenzothiophene (DBT) removal from model fuel. XRD, UV-DRS, FE-SEM, EDX, BET and VSM characterizations were used to analyze the fabricated nanocomposites. At specific experimental conditions (100 mg/l DBT in model fuel, photocatalyst dosage of 2 g/l, visible light irradiation time of 2 h and H2O2/DBT mole ratio of 8:1), the ZIF-67@(1 wt%)CoWO4 sample exhibited excellent photocatalytic oxidative desulfurization (PODS) activity (96.7%) between different prepared photocatalysts, The improved reaction performance of ZIF-67@(1%wt)CoWO4 heterostructure can be attributed to the reciprocal effects of the high adsorption capacity of ZIF-67, optical properties of CoWO4 nanoparticles and the high charges separation and transfer efficiencies. Besides, the ZIF-67@CoWO4 photocatalyst possesses good stability for PODS and can be reused for five reaction cycles without a significant activity loss, indicating that it might be very useful in the deep PODS of hydrocarbon fuel.
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