{"title":"协同光催化:使用高表面积g-C3N4和TiO2 - WO3 - Bi2O3/SiO2的异质结纳米复合材料增强有机染料的降解。","authors":"Rezvan Abdollahpour, Amin Bazyari","doi":"10.1007/s11356-025-36664-1","DOIUrl":null,"url":null,"abstract":"<p><p>High-performance nanocomposites of high-surface-area (HSA) g-C<sub>3</sub>N<sub>4</sub> and TiO<sub>2</sub>-WO<sub>3</sub>-Bi<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> (g-C<sub>3</sub>N<sub>4</sub>/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N<sub>2</sub> adsorption-desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV-Vis DRS, and PL spectroscopy. The study investigated the effects of g-C<sub>3</sub>N<sub>4</sub> content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C<sub>3</sub>N<sub>4</sub> photocatalyst, with a high surface area of approximately 100 m<sup>2</sup>/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1 g/L of the optimized 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst with an initial RhB concentration of 10 mg/L after only 20 min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C<sub>3</sub>N<sub>4</sub> with TSBW, facilitated by the formation of a type II heterojunction between TiO<sub>2</sub> and g-C<sub>3</sub>N<sub>4</sub>, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O<sub>2</sub><sup>-</sup>). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst was also demonstrated.</p>","PeriodicalId":545,"journal":{"name":"Environmental Science and Pollution Research","volume":" ","pages":""},"PeriodicalIF":5.8000,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synergistic photocatalysis: enhanced degradation of organic dyes using a heterojunction nanocomposite of high-surface-area g-C<sub>3</sub>N<sub>4</sub> and TiO<sub>2</sub> - WO<sub>3</sub> - Bi<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>.\",\"authors\":\"Rezvan Abdollahpour, Amin Bazyari\",\"doi\":\"10.1007/s11356-025-36664-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>High-performance nanocomposites of high-surface-area (HSA) g-C<sub>3</sub>N<sub>4</sub> and TiO<sub>2</sub>-WO<sub>3</sub>-Bi<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> (g-C<sub>3</sub>N<sub>4</sub>/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N<sub>2</sub> adsorption-desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV-Vis DRS, and PL spectroscopy. The study investigated the effects of g-C<sub>3</sub>N<sub>4</sub> content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C<sub>3</sub>N<sub>4</sub> photocatalyst, with a high surface area of approximately 100 m<sup>2</sup>/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1 g/L of the optimized 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst with an initial RhB concentration of 10 mg/L after only 20 min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C<sub>3</sub>N<sub>4</sub> with TSBW, facilitated by the formation of a type II heterojunction between TiO<sub>2</sub> and g-C<sub>3</sub>N<sub>4</sub>, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O<sub>2</sub><sup>-</sup>). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst was also demonstrated.</p>\",\"PeriodicalId\":545,\"journal\":{\"name\":\"Environmental Science and Pollution Research\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2025-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Science and Pollution Research\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1007/s11356-025-36664-1\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"0\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Science and Pollution Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s11356-025-36664-1","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Synergistic photocatalysis: enhanced degradation of organic dyes using a heterojunction nanocomposite of high-surface-area g-C3N4 and TiO2 - WO3 - Bi2O3/SiO2.
High-performance nanocomposites of high-surface-area (HSA) g-C3N4 and TiO2-WO3-Bi2O3/SiO2 (g-C3N4/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N2 adsorption-desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV-Vis DRS, and PL spectroscopy. The study investigated the effects of g-C3N4 content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C3N4 photocatalyst, with a high surface area of approximately 100 m2/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1 g/L of the optimized 50% g-C3N4/TSBW heterojunction photocatalyst with an initial RhB concentration of 10 mg/L after only 20 min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C3N4 with TSBW, facilitated by the formation of a type II heterojunction between TiO2 and g-C3N4, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O2-). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C3N4/TSBW heterojunction photocatalyst was also demonstrated.
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