Photodegradation of Nitrogen Oxide under Solar Light Using a Facile Synthesis Catalyst

Ernso Fenelon ； Sheng-Jie You ； Ya-Fen Wang

《Aerosol and Air Quality Research》 21卷10期 (2021/10) Pp. 1-14

https://doi.org/10.4209/aaqr.210128

摘要

NO_x is becoming a hot issue due to its contribution to ozone, PM_(2.5) formation, and its negative impacts on the ecosystem. In this study, the synthesis of an MgO/Bi_2S_3-BiOCl composite was carried out via the co-precipitation method for the photodegradation of nitrogen oxide (NO) under solar light. The BiOCl heterojunction is a result of interactions between the Bi_2S_3 solution and the MgCl_2.6H_2O precursor. This BiOCl heterojunction provides more available active species that enhance the degradation of NO. The successful synthesis of this composite using a co-precipitation method was confirmed by different characterization analyses (XRD, FTIR, SEM, TEM, DRS, and ESR). The photocatalytic degradation of NO under solar light using 7% MgO/Bi_2S_3-BiOCl reached an efficiency of 74.6%, which was better than that obtained using pure Bi_2S_3 (42.8%) and MgO (11.2%). The reusability test showed that the 7% MgO/Bi_2S_3-BiOCl material was maintained stability in the photodegradation of NO even after five cycles. The trapping test showed that the holes (h^+) and hydroxyl (^．OH^-) were the main active factors in the photodegradation process. The findings of this study confirmed that MgCl_2.6H_2O is a suitable precursor leading to improvements in the performance of Bi_2S_3 for the purpose of promoting a new composite that can be used in the photodegradation of NO and could be a candidate for practical applications.

關鍵字

MgO/Bi_2S_3-BiOCl ； Photocatalysis ； Nitrogen oxide ； Solar light