Controllable Synthesis of Core-Shell Bi@Amorphous Bi2O3 Nanospheres with Tunable Optical and Photocatalytic Activity for NO Removal
Controllable Synthesis of Core-Shell Bi@Amorphous Bi2O3 Nanospheres with Tunable Optical and Photocatalytic Activity for NO Removal
复制标题
可控合成具有可调光学和光催化活性的核壳 Bi@ 非晶 Bi2O3 纳米球去除 NO
DOI：
10.1021/acs.iecr.7b02497
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发表时间：
2017-09-20
影响因子：
4.2
通讯作者：
Lee, Shuncheng
中科院分区：
文献类型：
--
作者：
Chen, Meijuan;Li, Yan;Lee, Shuncheng
铋纳米粒子的大小、形貌和结构对其光催化性能有重要影响。本研究采用一步溶剂热法合成了具有核壳结构的Bi2O3型非晶纳米球，并对其脱除NO的反应机理进行了探讨。研究发现，在可见光照射下，铋纳米粒子可以通过表面等离子体共振(SPR)产生载流子，而表面无定形的Bi2O3层可以促进载流子的分离。合成时间为18h的Bi2O3光催化剂对NO的降解表现出良好的可见光催化活性，这归功于其合适的尺寸和合适的非晶态Bi2O3层。O-中心点(2)-、O-1(2)和(OH)-O-中心点自由基是光催化过程中的主要反应物种。此外，还对光催化脱除NO的强化机理进行了探讨。研究表明，制备核壳结构的BiBi2O3是一种有效控制大气污染的有效策略。
The size, morphology, and structure of a Bi nanoparticle can significantly affect its photocatalytic performance. In this study, core shell structured Bi@amorphous Bi2O3 nanospheres were synthesized through a one-step solvothermal method, and the reaction mechanisms on NO removal were proposed. It was found that Bi nanoparticles can generate charge carriers by surface plasma resonance (SPR) under visible light irradiation, while the surface amorphous Bi2O3 layer can facilitate the charge carriers' separation. The Bi@ Bi2O3 sample with the synthesis time of 18 h exhibited superior visible light photocatalytic activity for NO degradation, attributed to the suited size and suitable amorphous Bi2O3 layer. O-center dot(2)-, O-1(2), and (OH)-O-center dot radicals were identified as the main reactive species involved in the photocatalysis processes. Moreover;the enhancement mechanisms of photocatalytic NO removal over Bi@Bi2O3 samples were discussed. This study demonstrated that the fabrication of core shell structured Bi@Bi2O3 is a good strategy for effective air pollution control.