材料科学
光催化
甲基橙
异质结
光降解
纳米片
纳米颗粒
可见光谱
光化学
共沉淀
化学工程
纳米技术
无机化学
光电子学
化学
催化作用
有机化学
工程类
作者
Jin Hyeok Lee,Yechan Lee,Chinna Bathula,Abhijit N. Kadam,Sang–Wha Lee
出处
期刊:Chemosphere
[Elsevier]
日期:2022-06-01
卷期号:296: 133973-133973
被引量:28
标识
DOI:10.1016/j.chemosphere.2022.133973
摘要
Herein, the two synthesis strategies are employed for rational design of 0D/2DAg-Ag2S-CdS heterojunctions towards photocatalytic degradation of methyl orange (MO) under simulated solar light. As the first strategy, a ternary Ag-Ag2S-CdS nanosheet (NS) heterojunction was fabricated via combined cation exchange and photo-reduction (CEPR) method (Ag-Ag2S-CdS/CEPR). The second strategy employed coprecipitation (CP) method (Ag-Ag2S-CdS/CP). Strikingly, SEM, TEM and HR-TEM images are manifested the first strategy is beneficial for retaining the original thickness (20.2 nm) of CdS NSs with a dominant formation of metallic Ag, whereas the second strategy increases the thickness (33.4 nm) of CdS NSs with a dominant formation of Ag2S. The Ag-Ag2S-CdS/CEPR exhibited 1.8-fold and 3.5-fold enhancement in photocatalytic activities as compared to those of Ag-Ag2S-CdS/CP and bare CdS NSs, respectively. This enhanced photocatalytic activity could be ascribed to fact that the first strategy produces a high-quality interface with intimate contact between the Ag-Ag2S-CdS heterojunctions, resulting in enhanced separation of photo-excited charge carriers, extended light absorption, and enriched active-sites. Furthermore, the degradation efficiency of Ag-Ag2S-CdS/CEPR was significantly reduced to ∼5% in the presence of BQ (•O2- scavenger), indicating that •O2- is the major active species that can decompose MO dye under simulated solar light.
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