Constructing nanoflower-like semiconductor–insulator SrCO3/SrTiO3 heterojunction photocatalyst for the efficient removal of TC by the synergistic effect of adsorption and photocatalysis
{"title":"Constructing nanoflower-like semiconductor–insulator SrCO3/SrTiO3 heterojunction photocatalyst for the efficient removal of TC by the synergistic effect of adsorption and photocatalysis","authors":"Meng Wen, Qi Guo, Xiaoling Liu, Xiang Li, Heping Li, Haijuan Zhan, Wanyi Liu","doi":"10.1016/j.poly.2025.117420","DOIUrl":null,"url":null,"abstract":"<div><div>A combination of adsorption and photocatalysis is a promising method to degrade organic pollutants. Herein, the work adopts SrTiO<sub>3</sub> semiconductor coupled with insulator SrCO<sub>3</sub> via an in-situ solvent method to construct a heterojunction with built-in electric field (IEF) photocatalyst, which improves excellently the electrons-holes (h<sup>+</sup>-e<sup>-</sup>) separation and adsorption performance on SrTiO<sub>3</sub>. The close heterojunction and the IEF formed at the heterojunction interface enhance the transfer and separation of photogenerated carriers, generating more active substances. Meanwhile, the unique nanoflower structure of SrCO<sub>3</sub>/SrTiO<sub>3</sub> and the introduction of SrCO<sub>3</sub> provide more adsorption sites and active centers, which is conducive to the adsorption and activation of TC. Thus, the maximum adsorption capacity of SrCO<sub>3</sub>/SrTiO<sub>3</sub> could be up to 47.15 mg/g<sup>-</sup><sup>1</sup> within 30 min. Compared with pure SrTiO<sub>3</sub>, SrCO<sub>3</sub>/SrTiO<sub>3</sub> exhibited the excellent removal of tetracycline hydrochloride (TC) (120 min, 90.5 %) via the synergistic effect of adsorption and photocatalysis under visible light, and its photocatalytic reaction rate was 24.79 and 3 times higher than SrCO<sub>3</sub> and SrTO<sub>3</sub>, individually. h<sup>+</sup>and •O<sub>2</sub><sup>–</sup> played a pivotal role in TC degradation. Additionally, the adsorption behavior of TC on SrCO<sub>3</sub>/SrTiO<sub>3</sub> composite and the photocatalytic degradation mechanism of SrCO<sub>3</sub>/SrTiO<sub>3</sub> were investigated in detail. This work provides a new idea for improving the photocatalytic performance of SrTiO<sub>3</sub> and the application of insulators in photocatalysis.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"271 ","pages":"Article 117420"},"PeriodicalIF":2.6000,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polyhedron","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0277538725000348","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
A combination of adsorption and photocatalysis is a promising method to degrade organic pollutants. Herein, the work adopts SrTiO3 semiconductor coupled with insulator SrCO3 via an in-situ solvent method to construct a heterojunction with built-in electric field (IEF) photocatalyst, which improves excellently the electrons-holes (h+-e-) separation and adsorption performance on SrTiO3. The close heterojunction and the IEF formed at the heterojunction interface enhance the transfer and separation of photogenerated carriers, generating more active substances. Meanwhile, the unique nanoflower structure of SrCO3/SrTiO3 and the introduction of SrCO3 provide more adsorption sites and active centers, which is conducive to the adsorption and activation of TC. Thus, the maximum adsorption capacity of SrCO3/SrTiO3 could be up to 47.15 mg/g-1 within 30 min. Compared with pure SrTiO3, SrCO3/SrTiO3 exhibited the excellent removal of tetracycline hydrochloride (TC) (120 min, 90.5 %) via the synergistic effect of adsorption and photocatalysis under visible light, and its photocatalytic reaction rate was 24.79 and 3 times higher than SrCO3 and SrTO3, individually. h+and •O2– played a pivotal role in TC degradation. Additionally, the adsorption behavior of TC on SrCO3/SrTiO3 composite and the photocatalytic degradation mechanism of SrCO3/SrTiO3 were investigated in detail. This work provides a new idea for improving the photocatalytic performance of SrTiO3 and the application of insulators in photocatalysis.
期刊介绍：
Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry.
Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
