Visible-light induced photocatalytic oxidative desulfurization using BiVO4/C3N4@SiO2 with air/cumene hydroperoxide under ambient conditions

二苯并噻吩 烟气脱硫 光催化 材料科学 吸附 异丙苯 过氧化氢异丙苯 化学工程 催化作用 化学 有机化学 工程类
作者
Guang Miao,Dishun Huang,Xiaoling Ren,Xin Li,Zhong Li,Jing Xiao
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:192: 72-79 被引量:93
标识
DOI:10.1016/j.apcatb.2016.03.033
摘要

Trace amount of thiophenic compounds in fuel is harmful to the environment and challenging to get rid of efficiently. The objective of this work is to explore a new visible-light induced photocatalytic oxidative desulfurization (PODS) approach using BiVO4/C3N4@SiO2 with air/cumene hydroperoxide (CHP) under ambient conditions. A series of BiVO4/C3N4@SiO2 photocatalysts were prepared by a hydrothermal method and PODS tests were carried out in a Xenon lamp built-in batch reactor. The dibenzothiophene conversion of the PODS system reached as high as 99%. BiVO4/C3N4@SiO2 showed high vis-photocatalytic activity due to the effective charge separation of BiVO4/C3N4 and small particle size of BiVO4. Additional air flow was demonstrated to effectively enhance PODS kinetics of BiVO4/C3N4@SiO2 with CHP, which may be ascribed to the accelerated ROO generation by air with R radical for DBT oxidation. Mixing silica gel with BiVO4/C3N4@SiO2 as a hybrid adsorbent under photocatalytic adsorptive desulfurization (PADS) showed a dramatically enhanced desulfurization capacity (7.2 mg/g) compared to that under sole ADS. When fitted to Langmuir adsorption isotherm, K and qm reached as high as 0.24 and 7.41. The integrated PADS system can be particularly suitable for s single-stage desulfurization for low-sulfur fuel production under visible light at ambient conditions.
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