Department of Chemistry, University of Ioannina, Ioannina, 45110, Greece.
Institute of Chemical Engineering Sciences, Foundation of Research and Technology Hellas, Rio Patras, 26504, Greece.
Chemistry. 2023 Jun 19;29(34):e202300568. doi: 10.1002/chem.202300568. Epub 2023 May 2.
In this work, we present the structural, optical and photocatalytic properties of CdS semiconducting nanostructures, doped with palladium- and cobalt-based species. XRD analysis, corroborated by Raman and XPS, demonstrated the growth of CdS crystallites in the hexagonal structure, whereas solvothermal conversion of neat precursor metal salts resulted in the formation of metallic Pd and cobalt oxide, respectively. Scanning electron microscopy imaging certified the dendritic structure of hybrids, especially in the case where CdS was grown in the presence of either palladium- or cobalt-based nanoparticles. XPS surface analysis revealed that a major fraction of metallic Pd nanoparticles was converted to PdO during the in situ growth of CdS nanoparticles. The oxidation of Pd nanoparticles could be ascribed to chemisorption of oxygen phases onto the metal surface. The presence of cocatalyst nanoparticles resulted in an appreciable shift of the absorption edge of the ternary hybrids by about 50 nm. The optimized hybrid was found to photodegrade Orange G dye almost quantitatively within 2 h, by simulated solar light irradiation. Scavenging experiments revealed that hydroxy radicals were the main transient intermediate, leading to the oxidative degradation of the dye.
在这项工作中，我们研究了钯和钴基物种掺杂的 CdS 半导体纳米结构的结构、光学和光催化性能。XRD 分析得到了 Raman 和 XPS 的证实，表明 CdS 晶须在六方结构中生长，而纯前体金属盐的溶剂热转化分别形成了金属 Pd 和钴氧化物。扫描电子显微镜成像证明了杂化物的枝状结构，特别是在 CdS 在钯或钴基纳米颗粒存在下生长的情况下。XPS 表面分析表明，在 CdS 纳米颗粒的原位生长过程中，大部分金属 Pd 纳米颗粒转化为 PdO。Pd 纳米颗粒的氧化可归因于氧相在金属表面的化学吸附。助催化剂纳米颗粒的存在导致三元杂化物的吸收边显著移动约 50nm。通过模拟太阳光照射，发现优化后的杂化物在 2 小时内几乎定量地光降解了橙色 G 染料。猝灭实验表明，羟基自由基是主要的瞬态中间体，导致染料的氧化降解。
