Piezo-photocatalytic Activity of Bi0.5Na0.5TiO3@TiO2 Composite Catalyst with Heterojunction for Degradation of Organic Dye Molecule,The Journal of Physical Chemistry C

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Piezo-photocatalytic Activity of Bi0.5Na0.5TiO3@TiO2 Composite Catalyst with Heterojunction for Degradation of Organic Dye Molecule
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-10-26 , DOI: 10.1021/acs.jpcc.0c04700
Xingang Xu ₁ , Xiujuan Lin ₁ , Fanghui Yang ₁ , Shifeng Huang ₁ , Xin Cheng ₁

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The low-yield and high-recombination rate of carriers are the main factors that limit the efficiency of traditional piezocatalysis and photocatalysis. In this paper, the Bi_0.5Na_0.5TiO₃@TiO₂ composite catalyst with heterojunction was prepared and applied to obtain superior piezo-photocatalytic activity. On the one hand, the narrow band gap (2.77 eV) made it easy for the composite to excite photogenerated carriers under visible light. On the other hand, the piezoelectric field that originated from the bending deformation of Bi_0.5Na_0.5TiO₃ effectively promoted the separation and migration of carriers. Driven by ultrasonic vibration and visible light irradiation, the poled composite catalyst degraded over 97% of RhB dye solution through piezo-photocatalytic effect in 90 min. Compared with pure BNT and TiO₂, the enhanced catalytic performance of the BNT@TiO₂ composite indicated the superiority of the heterojunction.

中文翻译：

Bi _0.5 Na _0.5 TiO ₃ @TiO ₂异质结复合催化剂对有机染料分子的压电光催化活性

载流子的低产率和高重组率是限制传统压电催化和光催化效率的主要因素。本文制备了具有异质结的Bi _0.5 Na _0.5 TiO ₃ @TiO ₂复合催化剂，并用于获得优异的压电光催化活性。一方面，窄带隙（2.77 eV）使复合材料易于在可见光下激发光生载流子。另一方面，来自Bi _0.5 Na _0.5 TiO ₃的弯曲变形的压电场有效地促进了载体的分离和迁移。在超声振动和可见光辐射的驱动下，极化复合催化剂在90分钟内通过压电光催化作用降解了97％以上的RhB染料溶液。与纯BNT和TiO ₂相比，BNT @ TiO ₂复合材料增强的催化性能表明了异质结的优越性。

更新日期：2020-10-26

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