Facile synthesis of Z-scheme KBiO3/g-C3N4 Z-scheme Heterojunction Photocatalysts: Structure, Performance, and Mechanism
Facile synthesis of Z-scheme KBiO3/g-C3N4 Z-scheme Heterojunction Photocatalysts: Structure, Performance, and Mechanism
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DOI：
10.1016/j.jece.2022.107804
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发表时间：
2022-04
影响因子：
7.7
通讯作者：
Hao Zhang;Jian He;Pan Wu;Wei Jiang
中科院分区：
文献类型：
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作者：
Hao Zhang;Jian He;Pan Wu;Wei Jiang
异质结光催化剂的界面接触设计对界面载流子的转移/分离起着重要的作用。z型光催化剂可以减少光生电子-空穴对的复合，保持原有的氧化还原能力。本文采用混合和程序升温的方法制备了KBiO3/g- c3n4z型异质结光催化剂。与纯g- c3n4和KBiO3相比，制备的光催化剂对光氧化降解结晶紫和苯酚的光催化性能明显提高。降解CV（结晶紫）和苯酚的表观速率常数分别为0.15493 min−1和0.02057 min−1，分别是纯KBiO3的10倍和4倍。通过实验和DFT计算研究了KBiO3/ c3n4z型异质结的形成机理。结果表明，光降解性能的提高是由于z型光催化剂形成的内部电场增强了可见光吸收和光致电子-空穴复合的阻断效应。
The proper design of interfacial contact of heterojunction photocatalyst plays an important role in the transfer/separation of interfacial charge carriers. The Z-type photocatalyst can reduce the recombination of photogenerated electron-hole pairs and retain the original redox ability. Here, KBiO3/g-C3N4Z-scheme heterojunction photocatalysts were facile synthesized by mixing and programmed heating. Compared to pure g-C3N4and KBiO3,the photocatalytic performance of the obtained photocatalyst on the photo-oxidative degradation of crystal violet and phenol was improved significantly. The apparent rate constants of degrading CV (Crystal Violet) and phenol were 0.15493 min−1and 0.02057 min−1, which were 10 times and 4 times that of pure KBiO3, respectively. The formation mechanism of KBiO3/C3N4Z-type heterojunction was investigated by experiments and DFT calculations. The result shows that the improvement of photo-degradation performance was attributed to the internal electric field formed by the Z-scheme photo-catalyst, which leads to the enhancement of visible light absorption and the blocking effect of light-induced electron-hole recombination.