Enhanced removal and selective conversion for NO with N-vacancies g-C3N4\BaTiO3 by piezo-photocatalysis

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2024-12-03 DOI:10.1016/j.seppur.2024.130914

Guanyu Liu , Tianzheng Zhao , Jiayu Wu , Miaomiao Chang , Hailiang Fei , Fen Li , Sanqiang Yang , Qian Li

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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 (CN_V) compounded with BaTiO₃ (CN_VB) was prepared, which exhibited excellent piezo-photocatalytic (PPC) activity for NO removal, with a removal efficiency of 77.9 %. It is 2.21, 1.60 times higher than that of g-C₃N₄, CN_V with piezo-photocatalysis and 1.62 times comparing to CN_VB with only photocatalysis. Besides, the higher conversion rates of NO to NO₃^– (71.3 %) performed by CN_VB with piezo-photocatalysis compared to g-C₃N₄ and CN_V 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 CN_VB 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_VB, 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^–.

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氮空位g-C3N4\BaTiO3在压电光催化下对NO的去除和选择性转化

压电光催化是一种很有前途的提高光催化活性的方法，但对NO的去除仍是一个挑战和未知的问题。同时，光催化脱硝过程中对NO2生成的抑制仍然是一个非常棘手的问题。本文制备了含N空位的g-C3N4 （CNV）与BaTiO3 （CNVB）复合材料，该材料具有优异的压电光催化（PPC）脱除NO的活性，脱除效率为77.9% %。是g-C3N4、压电光催化CNV的2.21倍，是光催化CNV的1.59倍，是光催化CNVB的1.62倍。此外，与g-C3N4和CNV相比，CNVB在压电光催化下对NO3 -的转化率（71.3 %）更高，表明CNVB对NO2有抑制作用，对NO的去除有选择性。结构表征和DFT计算表明，在压电极化诱导的内嵌电场（BEF）作用下，CNVB产生了足够数量的载流子（e-和h+），并定向迁移到CNVB的弯曲价带和导带。这使得CNVB的整体能带位置发生负移动，有效地促进了NO和O2的选择性吸附和活化以及e-、·O2 -的生成，提高了NO的去除效率，提高了NO对NO3 -的选择性。

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麦克林

benzoquinone (BQ)

麦克林

Barium titanate

来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

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.