National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing 400067, China; School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing 400067, China.
J Colloid Interface Sci. 2023 Jan 15;630(Pt B):704-713. doi: 10.1016/j.jcis.2022.10.160. Epub 2022 Nov 2.
The degradation and mineralization of volatile organic compounds (VOCs) in gas-solid phase photocatalytic systems suffer great challenges due to the low electron transfer efficiency and slow benzene ring-opening kinetics. Hence, a heterojunction photocatalyst of BiSiO/TiO has been synthesized by a facile method. BiSiO/TiO shows the ability of mineralizing toluene to CO with a degradation rate of 85.5%, while TiO is 49.0% and presents a continuous deactivation. Experimental characterizations and theoretical calculations indicate that a unique electron transfer channel of Bi/Si-O-Ti can be established in the heterojunction sample due to the coupling of the interface. The channel facilitates electron transfer to the catalyst surface, generating •OH radicals with strong oxidation and ring-opening ability. Moreover, in-situ DRIFTS reveal that the selective generation of benzoic acid on BiSiO/TiO heterojunction plays a critical role in the ring-opening of toluene. This work discloses a novel paradigm to obtain the deep and durable photocatalytic mineralization of toluene.
在气固相间光催化体系中，挥发性有机化合物（VOCs）的降解和矿化由于电子转移效率低和苯环开环动力学缓慢而面临巨大挑战。因此，通过一种简便的方法合成了 BiSiO/TiO 异质结光催化剂。BiSiO/TiO 具有将甲苯矿化为 CO 的能力，降解率为 85.5%，而 TiO 为 49.0%，并呈现出连续失活。实验表征和理论计算表明，由于界面的耦合，可以在异质结样品中建立独特的 Bi/Si-O-Ti 电子转移通道。该通道有助于电子转移到催化剂表面，生成具有强氧化和开环能力的 •OH 自由基。此外，原位 DRIFTS 揭示了 BiSiO/TiO 异质结上苯甲酸的选择性生成在甲苯开环中起着关键作用。这项工作揭示了一种获得甲苯深度和持久光催化矿化的新范例。
