Chemical etching fabrication of uniform mesoporous Bi@Bi2O3 nanospheres with enhanced visible light-induced photocatalytic oxidation performance for NOx
Chemical etching fabrication of uniform mesoporous Bi@Bi2O3 nanospheres with enhanced visible light-induced photocatalytic oxidation performance for NOx
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化学刻蚀制备均匀介孔Bi@Bi2O3纳米球，增强可见光诱导光催化氧化NOx性能
DOI：
10.1016/j.cej.2020.126910
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发表时间：
2021-02
影响因子：
15.1
通讯作者：
Junji Cao
中科院分区：
文献类型：
--
作者：
Peng Zhang;Yu Huang;Yongfang Rao;Meijuan Chen;Xinwei Li;Wingkei Ho;Shuncheng Lee;Junji Cao
具有微孔结构的块体材料不利于光催化反应中的光吸收、光电子和反应物传输。介孔光催化剂在光催化领域显示出许多显著的优势。本文采用盐酸-乙醇化学刻蚀法在低温（60 °C）下制备了均匀的介孔Bi@Bi2O3纳米球。在可见光照射下，所制备的介孔沸石提高了NO的去除率（16%），抑制了有毒NO2的产生（3%）。在模板去除过程中避免了Bi的进一步氧化和高温煅烧。此外，所制备的样品具有比本体微孔Bi@Bi2O3更窄的孔径分布（3.2-3.9 nm）和更强的光和NO吸附能力。功函数和电子自旋共振测试结果也表明，整个能带的位置在Bi 2 O3降低。在均匀的介孔结构上产生的活性氧物种的量高于在本体Bi@Bi2O3上的活性氧物种的量。然而，光电化学测量表明，与均匀的介孔Bi@Bi2 O3相比，光生载流子的分离效率并没有得到提高。综合研究表明，光催化活性的提高是由于氧化能力而不是载流子分离效率的提高。本工作阐明了均匀的介孔结构在NOx光催化氧化中的作用，并为结构工程制备高活性和实用的光催化剂提供了有效的策略。
Bulk materials with a microporous structure are adverse to light adsorption, photoelectron and reactant transport in a photocatalytic reaction. Mesoporous photocatalysts have shown many marked advantages in photocatalytic fields. Herein, uniform mesoporous Bi@Bi2O3nanospheres were fabricated by HCl–ethanol chemical etching at low temperature (60 °C). The obtained mesoporous photocatalysis increased the NO removal efficiency (16%) and inhibited toxic NO2generation (3%) under visible light irradiation. Further oxidation of Bi and calcination at high temperatures were avoided during template removal. Moreover, the as-prepared sample possessed a remarkably narrower pore size distribution (3.2–3.9 nm) and stronger light and NO adsorption ability than the bulk microporous Bi@Bi2O3. Work function and the electron spin resonance test results also indicated that the position of the entire energy bands on Bi2O3was lowered. The amount of reactive oxygen species generated over the uniform mesoporous structure was higher than that over bulk Bi@Bi2O3. However, photoelectrochemical measurements indicated that the separation efficiencies of the photo-generated carriers were not improved over the uniform mesoporous Bi@Bi2O3. Comprehensive studies have shown that the oxidation ability rather than the enhanced separation efficiency of charge carriers accounted for the enhanced photocatalytic activity. This work elucidates the roles of a uniform mesoporous structure in NOxphotocatalytic oxidation and provides an efficient strategy for structural engineering in preparing highly reactive and practical photocatalysts.
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