光催化
成核
降级(电信)
氢氧化物
纳米晶
材料科学
化学工程
质子化
光化学
反应速率常数
无机化学
化学
纳米技术
催化作用
离子
动力学
有机化学
工程类
物理
电信
量子力学
计算机科学
作者
Zhiqiang Li,Wanqing Li,Hongyu Shao,Minghao Dou,Yuye Cheng,Xiangling Wan,Xiuxian Jiang,Zhengguang Zhang,Yanyan Chen,Shenjie Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-03-11
卷期号:6 (6): 4417-4427
被引量:7
标识
DOI:10.1021/acsanm.2c05500
摘要
Water-soluble nonrare metal Ag–Sn–S nanocrystals (ATS NCs) were green synthesized at room temperature using the interfacial nucleation mechanism. Interfacial acids regulate the concentration of hydroxide ions outside the complex, the sulfur sources attack the cations at the complex interface, and the sulfur sources form covalent bonds to complete crystal nucleation and growth at room temperature. The band gap of ATS NCs synthesized by the interface nucleation mechanism is 2.32∼2.59 eV, which gives it a higher redox ability and very high photocatalytic degradation rate. A total of 0.8 mg of Ag2SnS3 NCs can achieve photocatalytic degradation of more than 99% of MO (1 mg) under visible light (λ > 420 nm) in 2 min with a photocatalytic rate constant of 2.1247 min–1. Interfacial regulation of acid protonation on the surface of ATS NCs produced more defect states, which was conducive to trapping holes (h+), promoting their transfer to organic pollutants, and improving the photocatalytic oxidation degradation efficiency. Active species of trapping experiments showing photocatalytic degradation of active species as h+, ·O2–, and ·OH do not act as active species for MO degradation in this system. ATS NCs have ultra-high photocatalytic activity and further improve their photocatalytic efficiency by partially coated ZnS shells. Finally, we present the mechanism of photocatalytic degradation of ATS NCs and analyze the possible applications of ATS NCs. Due to its unique advantages of direct synthesis in organic pollutants at room temperature, it is expected to achieve a breakthrough in the practical treatment of large-scale industrial wastewater.
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