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A novel microwave-assisted impregnation method with water as the dispersion medium to synthesize modified g-C3N4/TiO2 heterojunction photocatalysts
Optical Materials ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.optmat.2020.110128
Yuanyuan Liu , Jing Tian , Linyu Wei , Qing Wang , Chuan Wang , Chun Yang

Abstract A microwave-assisted impregnation method with water as the dispersion medium was developed to prepare KCNN (K doped g-C3N4 nanosheets)-TiO2 heterojunction composite material (KCNNT). With this novel method, KCNN and TiO2 can be evenly dispersed during synthesis to make large number of effective heterojunctions, thus offering high photocatalytic efficiency. Moreover, the use of water, instead of chemical reagents, as the dispersant makes this method both cost- and environmental-friendly. The photocatalytic degradation efficiency of RhB by KCNNTM synthesized by the microwave-assisted impregnation method was 1.23 times higher than that of KCNNTH synthesized by the thermal radiation assisted impregnation method. In addition, the photocatalytic degradation efficiency of RhB by the KCNNT0.5M (formed with the KCNN and TiO2 at ratio of 1:0.5) was 2.4 times higher than that of the CNT0.5M (formed with pure g-C3N4 and TiO2 at ratio of 1:0.5), indicating the importance of modification of g-C3N4 before the formation of composite materials. KCNN formed Z-type heterojunction with TiO2, which improved the separation efficiency of electron-hole and greatly improved the photocatalytic efficiency. The photocatalytic degradation efficiency of RhB by the KCNNT0.5M was 4.1 times higher than that of pure g-C3N4 under visible light.

中文翻译:

一种以水为分散介质的微波辅助浸渍法合成改性g-C3N4/TiO2异质结光催化剂

摘要 开发了一种以水为分散介质的微波辅助浸渍法制备KCNN(K掺杂g-C3N4纳米片)-TiO2异质结复合材料(KCNNT)。通过这种新方法,KCNN 和 TiO2 可以在合成过程中均匀分散,形成大量有效的异质结,从而提供高光催化效率。此外,使用水而不是化学试剂作为分散剂使这种方法既经济又环保。微波辅助浸渍法合成的KCNNTM光催化降解RhB的效率是热辐射辅助浸渍法合成的KCNNTH的1.23倍。此外,KCNNT0.5M(KCNN和TiO2以1:0的比例形成)对RhB的光催化降解效率。5) 比 CNT0.5M(由纯 g-C3N4 和 TiO2 以 1:0.5 的比例形成)高 2.4 倍,表明在复合材料形成之前对 g-C3N4 进行改性的重要性。KCNN与TiO2形成Z型异质结,提高了电子-空穴的分离效率,大大提高了光催化效率。在可见光下,KCNNT0.5M对RhB的光催化降解效率是纯g-C3N4的4.1倍。
更新日期:2020-09-01
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