Kgaugelo S. Mabape, Shivani B. Mishra, Ajay K. Mishra, Makwena J. Moloto
{"title":"用于光催化降解环丙沙星的纳米金字塔形 CuWO4-MOF 修饰 TiO2 纳米薄片异质结的阳光驱动电荷分离技术","authors":"Kgaugelo S. Mabape, Shivani B. Mishra, Ajay K. Mishra, Makwena J. Moloto","doi":"10.1007/s11696-024-03686-x","DOIUrl":null,"url":null,"abstract":"<div><p>The study presents a breakthrough of a balanced charge separation for heterojunction CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst to efficiently enhance visible light photocatalytic degradation of ciprofloxacin (CIP). A solvothermal-synthesized nanopyramid-like CuWO<sub>4</sub> semiconductor was assembled before sol–gel treatment with TiO<sub>2</sub> precursors to generate CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposites. The optical, structural, and morphological properties of CuWO<sub>4</sub>-TiO<sub>2</sub> were elucidated using UV–Vis DRS, XRD, FTIR, Raman spectroscopy, and TEM/SEM techniques. The UV–Vis DRS spectroscopy of as-synthesized CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst demonstrated enhanced visible light absorbance. The XRD patterns of CuWO<sub>4</sub>-TiO<sub>2</sub> revealed a triclinic phase nanocrystal. The O-Ti–O functionality was confirmed by FTIR spectroscopy. The photoactive bands corresponding to anatase redshift were observed from Raman spectroscopy of CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposite. The PL studies attributed this redshift to the elevated extra energy bands that aid electron/hole pair charge separation in a co-catalyst heterojunction CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposite afforded by embedding CuWO<sub>4</sub>-MOF within TiO<sub>2</sub> crystalline. The TEM showed that un-sintered CuWO<sub>4</sub>.MOF mimicked a pyramidal shape and converted to nanoflakes upon sintering, while TiO<sub>2</sub> and CuWO<sub>4</sub>-TiO<sub>2</sub> retained a tetragonal shape. The photocatalytic activity of CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst was studied using CIP, as a model pollutant. The innovative design of 5CuWO<sub>4</sub>-TiO<sub>2</sub> charge separation nanocomposite completely degraded 10 mg L<sup>−1</sup> CIP solution at pH = 6.31 (natural pH) and 9 under 120 min of sunlight irradiation.</p></div>","PeriodicalId":513,"journal":{"name":"Chemical Papers","volume":"78 15","pages":"8417 - 8432"},"PeriodicalIF":2.2000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11696-024-03686-x.pdf","citationCount":"0","resultStr":"{\"title\":\"Sunlight-driven charge separation for a heterojunction of nano-pyramidal CuWO4-MOF modified TiO2 nanoflakes for photocatalytic degradation of ciprofloxacin\",\"authors\":\"Kgaugelo S. Mabape, Shivani B. Mishra, Ajay K. Mishra, Makwena J. Moloto\",\"doi\":\"10.1007/s11696-024-03686-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The study presents a breakthrough of a balanced charge separation for heterojunction CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst to efficiently enhance visible light photocatalytic degradation of ciprofloxacin (CIP). A solvothermal-synthesized nanopyramid-like CuWO<sub>4</sub> semiconductor was assembled before sol–gel treatment with TiO<sub>2</sub> precursors to generate CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposites. The optical, structural, and morphological properties of CuWO<sub>4</sub>-TiO<sub>2</sub> were elucidated using UV–Vis DRS, XRD, FTIR, Raman spectroscopy, and TEM/SEM techniques. The UV–Vis DRS spectroscopy of as-synthesized CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst demonstrated enhanced visible light absorbance. The XRD patterns of CuWO<sub>4</sub>-TiO<sub>2</sub> revealed a triclinic phase nanocrystal. The O-Ti–O functionality was confirmed by FTIR spectroscopy. The photoactive bands corresponding to anatase redshift were observed from Raman spectroscopy of CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposite. The PL studies attributed this redshift to the elevated extra energy bands that aid electron/hole pair charge separation in a co-catalyst heterojunction CuWO<sub>4</sub>-TiO<sub>2</sub> nanocomposite afforded by embedding CuWO<sub>4</sub>-MOF within TiO<sub>2</sub> crystalline. The TEM showed that un-sintered CuWO<sub>4</sub>.MOF mimicked a pyramidal shape and converted to nanoflakes upon sintering, while TiO<sub>2</sub> and CuWO<sub>4</sub>-TiO<sub>2</sub> retained a tetragonal shape. The photocatalytic activity of CuWO<sub>4</sub>-TiO<sub>2</sub> cocatalyst was studied using CIP, as a model pollutant. 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Sunlight-driven charge separation for a heterojunction of nano-pyramidal CuWO4-MOF modified TiO2 nanoflakes for photocatalytic degradation of ciprofloxacin
The study presents a breakthrough of a balanced charge separation for heterojunction CuWO4-TiO2 cocatalyst to efficiently enhance visible light photocatalytic degradation of ciprofloxacin (CIP). A solvothermal-synthesized nanopyramid-like CuWO4 semiconductor was assembled before sol–gel treatment with TiO2 precursors to generate CuWO4-TiO2 nanocomposites. The optical, structural, and morphological properties of CuWO4-TiO2 were elucidated using UV–Vis DRS, XRD, FTIR, Raman spectroscopy, and TEM/SEM techniques. The UV–Vis DRS spectroscopy of as-synthesized CuWO4-TiO2 cocatalyst demonstrated enhanced visible light absorbance. The XRD patterns of CuWO4-TiO2 revealed a triclinic phase nanocrystal. The O-Ti–O functionality was confirmed by FTIR spectroscopy. The photoactive bands corresponding to anatase redshift were observed from Raman spectroscopy of CuWO4-TiO2 nanocomposite. The PL studies attributed this redshift to the elevated extra energy bands that aid electron/hole pair charge separation in a co-catalyst heterojunction CuWO4-TiO2 nanocomposite afforded by embedding CuWO4-MOF within TiO2 crystalline. The TEM showed that un-sintered CuWO4.MOF mimicked a pyramidal shape and converted to nanoflakes upon sintering, while TiO2 and CuWO4-TiO2 retained a tetragonal shape. The photocatalytic activity of CuWO4-TiO2 cocatalyst was studied using CIP, as a model pollutant. The innovative design of 5CuWO4-TiO2 charge separation nanocomposite completely degraded 10 mg L−1 CIP solution at pH = 6.31 (natural pH) and 9 under 120 min of sunlight irradiation.
Chemical PapersChemical Engineering-General Chemical Engineering
CiteScore
3.30
自引率
4.50%
发文量
590
期刊介绍:
Chemical Papers is a peer-reviewed, international journal devoted to basic and applied chemical research. It has a broad scope covering the chemical sciences, but favors interdisciplinary research and studies that bring chemistry together with other disciplines.