Investigation on Al3+ and Al2O3 Coexist in BiVO4 for Efficient Methylene Blue Degradation: Insight into Surface States and Charge Separation
Investigation on Al3+ and Al2O3 Coexist in BiVO4 for Efficient Methylene Blue Degradation: Insight into Surface States and Charge Separation
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研究 Al3 和 Al2O3 共存于 BiVO4 中以实现亚甲基蓝的高效降解：深入了解表面态和电荷分离
DOI：
10.1021/acs.langmuir.1c01164
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发表时间：
2021-06-11
期刊：
影响因子：
3.9
通讯作者：
Lin, Yanhong
中科院分区：
文献类型：
--
作者：
Cao, Yuehong;Yang, Youzhi;Lin, Yanhong
采用水热法制备了一系列Al掺杂BiVO4复合材料，用于降解亚甲基蓝(MB)。从光学角度解释了光催化性能提高的原因。暂态光伏(TPV)测试表明，表面态优先捕获光生载流子，表面钝化层可以延长载流子寿命。表面光电压(SPV)、瞬时光电压(TPV)和表面光电流(SPC)测量结果表明，适当的掺杂可以改善光生载流子的传输特性，延长光生载流子的寿命。最后，阐述了可能的光催化机理，以说明可见光照射下的光生电荷行为。这项工作对Al掺杂和Al_2O_3钝化层在提高光催化性能方面的协同效应有了更好的理解。
A series of Al-doped BiVO4 composites have been synthesized via the hydrothermal method for methylene blue (MB) degradation application. The reasons for the improvement of photocatalytic performance was explained from the perspective of optics. Transient photovoltage (TPV) measurements suggested that the surface states have the priority to capture photogenerated carriers, and the Al2O3 surface passivation layer can prolong the lifetime of charge carrier. The results of surface photovoltage (SPV), transient photovoltage (TPV), and surface photocurrent (SPC) measurements suggested that the coexistence of Al3+ and Al2O3 caused by the appropriate doping would improve the transfer property and prolong the lifetime of photogenerated carriers. Finally, the possible photocatalytic mechanism is expounded to illustrate the photogenerated charge behavior under visible light irradiation. This work provides a better understanding of the synergistic effect of Al-doping and Al2O3 passivation layer on enhancing the photocatalytic performance.