甲基橙
降级(电信)
异质结
量子点
激进的
羟基自由基
化学工程
光催化
材料科学
分子
纳米颗粒
光化学
带隙
催化作用
复合数
纳米技术
化学
有机化学
光电子学
复合材料
计算机科学
电信
工程类
作者
Xinxin Chen,Changzhao Chen,Jiyuan Zang
标识
DOI:10.1016/j.diamond.2023.110385
摘要
Azo dye molecules represented by methyl orange (MO), widely exist in industrial wastewater, and their efficient degradation requires hydroxyl groups with high oxidation activity. g-C3N4/MoS2 heterojunctions are widely used in many photocatalytic applications. However, typical type-II narrow bandgap heterojunctions have holes that cannot be directly oxidized to hydroxyl groups, which is an important barrier to MO degradation. In this work, g-C3N4 nanosheets were modified with carbon quantum dots (CQDs) and combined with spherical MoS2 nanoparticles to form CCN/MS composite photocatalysts. CQDs can be used as electronic reservoir to efficiently separate photogenerated carriers and facilitate the indirect generation of hydroxyl radicals. The results showed that the CCN/MS (10:1) sample had the most excellent degradation performance, with 93 % MO degradation in 120 min, while the control sample of CN/MS (10:1) without introducing CQDs had a degradation rate of only 24 % within the same time interval. In the mixed MO/MB degradation experiments, the degradation of MO was preferred to that of MB, suggesting the existence of a competitive mechanism between the two molecules. Our work proposes a possible pathway for the generation of hydroxyl groups using narrow bandgap semiconductor heterojunction catalysts, which provides a new perspective for understanding the degradation mechanism of pollutant molecules in real industrial wastewater.
科研通智能强力驱动
Strongly Powered by AbleSci AI