Superior NOx photocatalytic removal over hybrid hierarchical Bi/BiOI with high non-NO2 selectivity: synergistic effect of oxygen vacancies and bismuth nanoparticles†,Catalysis Science & Technology

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Superior NOx photocatalytic removal over hybrid hierarchical Bi/BiOI with high non-NO2 selectivity: synergistic effect of oxygen vacancies and bismuth nanoparticles†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-09-12 00:00:00 , DOI: 10.1039/c8cy01466c
Qian Li _{1,

2,

3,

4,

5} , Shan Gao _{1,

2,

3,

4,

5} , Jing Hu _{1,

2,

3,

4,

5} , Haiqiang Wang _{1,

2,

3,

4,

5} , Zhongbiao Wu _{1,

2,

3,

4,

5}

Affiliation

To achieve an efficient photocatalyst for NO pollution control, abundant oxygen vacancies and metallic bismuth (Bi) nanoparticles were simultaneously introduced into three-dimensional hierarchal BiOI via in situ self-reduction with aqueous NaBH₄. The obtained 20-Bi/BiOI exhibited superior NO_x (NO and NO₂) removal efficiency with high selectivity for non-NO₂, compared to pristine BiOI. After careful analysis of various characterization results, it was found that such an enhancement was attributed to the synergistic results of shallow donors formed by oxygen vacancies and the surface plasmonic resonance (SPR) effect of Bi nanoparticles, both of which contributed to the promotion of light harvesting and the suppression of the recombination of photoinduced charge carriers. What's more, oxygen vacancies can improve NO adsorption, strongly combine with NO₂, and facilitate the formation of ˙OH and ˙O₂⁻ radicals, promoting the deep oxidation of NO_x (NO and NO₂) to NO₂⁻ and NO₃⁻, robustly evidenced by the results of ion chromatography. Overall, this work highlights the synergistic effects of Bi and oxygen vacancies introduced by a self-reduction strategy and opens up an effective avenue for addressing NO pollution.

中文翻译：

与具有高非NO ₂选择性的杂化分层Bi / BiOI相比，卓越的NO _x光催化去除能力：氧空位和铋纳米粒子的协同效应†

为了获得用于控制NO污染的有效光催化剂，通过将NaBH ₄水溶液原位自还原，将大量的氧空位和金属铋（Bi）纳米粒子同时引入到三维层次BiOI中。所获得的20-Bi / BiOI表现出优异的NO _x（NO和NO ₂）去除效率，并且对非NO _2的选择性高。，与原始的BiOI相比。在仔细分析各种表征结果后，发现这种增强归因于由氧空位形成的浅施主和Bi纳米粒子的表面等离振子共振（SPR）效应的协同结果，两者均有助于光的促进捕获和抑制光诱导电荷载体的重组。更重要的是，氧空位可以提高NO吸附，强烈NO结合₂，促进OH和O形成₂^-自由基，促进NO的深度氧化_X（NO和NO ₂）为NO ₂^-和NO ₃^-离子色谱的结果有力地证明了这一点。总体而言，这项工作强调了自还原策略引入的Bi和氧空位的协同效应，并为解决NO污染问题开辟了一条有效途径。

更新日期：2018-09-12

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