{"title":"Enhanced removal and selective conversion for NO with N-vacancies g-C3N4\\BaTiO3 by piezo-photocatalysis","authors":"Guanyu Liu, Tianzheng Zhao, Jiayu Wu, Miaomiao Chang, Hailiang Fei, Fen Li, Sanqiang Yang, Qian Li","doi":"10.1016/j.seppur.2024.130914","DOIUrl":null,"url":null,"abstract":"Piezo-photocatalysis is a promising strategy to improve photocatalytic activity, while it is challenged and unidentified for NO removal. Also, the restraint of NO<sub>2</sub> generation during the photocatalytic NO removal is still a very thorny problem. In this paper, g-C<sub>3</sub>N<sub>4</sub> containing N vacancies (CN<sub>V</sub>) compounded with BaTiO<sub>3</sub> (CN<sub>V</sub>B) was prepared, which exhibited excellent piezo-photocatalytic (PPC) activity for NO removal, with a removal efficiency of 77.9 %. It is 2.21, 1.59 times higher than that of g-C<sub>3</sub>N<sub>4</sub>, CN<sub>V</sub> with piezo-photocatalysis and 1.62 times comparing to CN<sub>V</sub>B with only photocatalysis. Besides, the higher conversion rates of NO to NO<sub>3</sub><sup>–</sup> (71.3 %) performed by CN<sub>V</sub>B with piezo-photocatalysis compared to g-C<sub>3</sub>N<sub>4</sub> and CN<sub>V</sub> indicated NO<sub>2</sub> inhibition and the selectivity for NO removal. Structural characterizations and DFT calculations revealed that an adequate number of carriers (e<sup>-</sup> and h<sup>+</sup>) are generated and migrated directionally to the bend valence band and conduction band of CN<sub>V</sub>B under the effect of built-in electric field (BEF) induced by piezo-polarization. This results in a negative shift in the overall band position of CN<sub>V</sub>B, and effectively promotes the selective adsorption and activation of NO and O<sub>2</sub> and the generation of e<sup>-</sup>, ·O<sub>2</sub><sup>–</sup>, enhancing the NO removal efficiency and improving the selectivity of NO to NO<sub>3</sub><sup>–</sup>.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"30 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.seppur.2024.130914","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Piezo-photocatalysis is a promising strategy to improve photocatalytic activity, while it is challenged and unidentified for NO removal. Also, the restraint of NO2 generation during the photocatalytic NO removal is still a very thorny problem. In this paper, g-C3N4 containing N vacancies (CNV) compounded with BaTiO3 (CNVB) was prepared, which exhibited excellent piezo-photocatalytic (PPC) activity for NO removal, with a removal efficiency of 77.9 %. It is 2.21, 1.59 times higher than that of g-C3N4, CNV with piezo-photocatalysis and 1.62 times comparing to CNVB with only photocatalysis. Besides, the higher conversion rates of NO to NO3– (71.3 %) performed by CNVB with piezo-photocatalysis compared to g-C3N4 and CNV indicated NO2 inhibition and the selectivity for NO removal. Structural characterizations and DFT calculations revealed that an adequate number of carriers (e- and h+) are generated and migrated directionally to the bend valence band and conduction band of CNVB under the effect of built-in electric field (BEF) induced by piezo-polarization. This results in a negative shift in the overall band position of CNVB, and effectively promotes the selective adsorption and activation of NO and O2 and the generation of e-, ·O2–, enhancing the NO removal efficiency and improving the selectivity of NO to NO3–.
期刊介绍：
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.
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