Jorgetto Alexandre de Oliveira, Boldrin Zanoni Maria Valnice, Orlandi Marcelo Ornaghi
Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University (UNESP), Araraquara, SP, 14800-060, Brazil.
National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), P.O. Box 355, Araraquara, SP, 14800-900, Brazil.
Sci Rep. 2023 Sep 7;13(1):14774. doi: 10.1038/s41598-023-40659-8.
A microporous Sn-containing SnO material presenting microrod morphology and a surface area of 93.0 m g was synthesized via a simple hydrothermal route. Sn ions were detected in the interior of the material (15.8 at.%) after the corrosion of a sample through sputtering. The material's optical properties have demonstrated the absorption of a considerable fraction of visible light up to wavelengths of 671 nm, due to the presence of Sn states in the material's band structure. The analysis of the internal crystalline structure of a single microrod was carried out with the aid of a focused ion beam microscope and indicated that the material is mesocrystalline down to nanoscale level. It was proposed that the Sn ions occupy intergranular sites in the highly defective crystalline structure of the material and that Sn states, as well as its relatively large surface area, are responsible for the material's superior photoactivity. The synthesized material was tested as a photocatalyst to decompose hazardous contaminants in water. The photocatalytic performance of the material was much higher than those of commercial TiO and SnO materials, decomposing nearly all methyl orange (an azo-dye model) content in water (10 mg L) in 6 min under UV irradiation for a photocatalyst dose of 5.33 g L. The photodegradation of methyl orange was also verified under visible light.
通过简单的水热法合成了一种具有微棒形态且表面积为93.0 m²/g的含锡微孔SnO材料。通过溅射腐蚀样品后，在材料内部检测到锡离子（15.8原子%）。由于材料能带结构中存在Sn态，其光学性质表明在波长高达671 nm的范围内吸收了相当一部分可见光。借助聚焦离子束显微镜对单个微棒的内部晶体结构进行了分析，结果表明该材料在纳米尺度下为介晶结构。有人提出，锡离子占据了材料高度缺陷晶体结构中的晶间位置，并且Sn态以及其相对较大的表面积是该材料具有优异光活性的原因。将合成的材料作为光催化剂用于分解水中的有害污染物进行了测试。该材料的光催化性能远高于商用TiO₂和SnO₂材料，在紫外光照射下，对于5.33 g/L的光催化剂剂量，在6分钟内几乎分解了水中（10 mg/L）的所有甲基橙（一种偶氮染料模型）含量。在可见光下也验证了甲基橙的光降解。
