In order to reduce the emission of SO x in the environment, sulfur compounds must be removed efficiently from fuels. Three-dimensional highly ordered meso-macroporous HPW/TiO 2 (3DO m/M HPW/TiO 2 ) materials were synthesized successfully by sol-gel method and applied as oxidative desulfurization catalyst for the model fuel. The characterization results displayed the existence of highly ordered meso-macroporous structures and the Keggin type of HPW was highly dispersed in TiO 2 framework. The effect of catalyst on desulfurization under different reaction conditions was studied systematically. The results showed that the catalyst exhibited excellent desulfurization performance in the hydrogen peroxide oxidation system, which could be explained by the unique meso-macroporous structure of catalyst. In addition, the catalyst showed good cycling performance and the removal rate of DBT still reached 96.1% even after 6 cycles, providing a feasible method for the development and application of fuel deep desulfurization catalysts.
The UiO-66-FP/HPW/TiO 2 heterojunction photocatalytic material is fabricated by one-pot solvothermal method. The crystal structure, elemental composition, morphology, and optical properties of as-prepared catalysts are well-characterized. Subsequently, the synthesized materials’ catalytic activity is evaluated by degrading rhodamine B (RhB) and ofloxacin (OFX) under visible-light illumination. It turns out that the 10 wt% UiO-66-FP/HPW/TiO 2 sample possesses the best efficiency, with 98.6% RhB and 97.2% OFX removed under identical condition, which is 4.68 and 4.14 times than that of HPW/TiO 2 , respectively. The superior efficiency can be ascribed to the construction of UiO-66-FP/HPW/TiO 2 heterostructure, better adsorption capacity of organic contaminants, enhanced visible light response, and lower recombination rate of e − -h + pairs. The quenching effect of distinct scavengers indicates that •OH is an additional significant contributor to the ternary photodegradation system besides •O 2 – and h VB + species. This constitutes another reason for the superior photocatalytic activity of UiO-66-FP/HPW/TiO 2 relative to HPW/TiO 2 . The photo-degradation efficiency of 10 wt% UiO-66-FP/HPW/TiO 2 composite is reduced by 4.68% after running five cycles. Overall, this work presents one type of efficient and reusable TiO 2 -based photocatalysts driven by visible light.
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