Influence of residual anions (Cl-, SO42- and NO3- ) on Mn2O3 for photothermal catalytic oxidation of toluene

作者：Yu, Xiao; Deng, Banghong; Yang, Lixia^*; Zou, Moliang; Chen, Zhenglin; Fan, Yixuan; Wei, Zhihui; Chen, Kai; Lu, Mingxia; Ying, Tiantian; Zhang, Jie^*; Dai, Weili

来源：Journal of Environmental Chemical Engineering, 2022, 10(5): 108496.

DOI：10.1016/j.jece.2022.108496

• Toluene
• Photothermal catalytic degradation
• Poisoning effect

Mn2O3 is a conventional catalyst that is applied in photothermal catalytic oxidation of toluene while regular anions like SO42-, Cl-, and NO3 - from different Mn precursors are left in Mn2O3. When applied in toluene degradation, the declining activity of Mn2O3 is always observable because the residual anions block the Mn4+/Mn3+ active sites, shield the oxygen vacancies, and cube the production of active oxygen species (O2- , O-). Herein, it is found that the residual SO42-, Cl-, and NO3 - make Mn2O3 incapacitated in deeply oxidizing the intermediates and cutting off the reaction process, and their influence ranks in the order of SO42->Cl->NO3- . Compared with pristine Mn2O3, the drops in CO2 conversion efficiency account for 11 %, 60 %, and 73 %, respectively. Nevertheless, rinsing with water is an effective method to remove the residual anions, and the more the rinsing, the better the toluene mineralization degree. This work provides a profound cognition of the deactivation mechanism of SO42-, Cl-, and NO3 - and points out an effective way to abate their negative effect for the first time.

• 单位
  nanchang hangkong university