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

IF 2.2 4区 化学 Q2 Engineering Chemical Papers Pub Date : 2024-09-16 DOI:10.1007/s11696-024-03686-x
Kgaugelo S. Mabape, Shivani B. Mishra, Ajay K. Mishra, Makwena J. Moloto
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引用次数: 0

摘要

该研究突破性地提出了异质结 CuWO4-TiO2 催化剂的平衡电荷分离技术,可有效提高环丙沙星(CIP)的可见光光催化降解能力。在溶胶-凝胶处理 TiO2 前体之前,先将溶胶热合成的纳米金字塔状 CuWO4 半导体组装在一起,生成 CuWO4-TiO2 纳米复合材料。利用紫外可见 DRS、XRD、傅里叶变换红外光谱、拉曼光谱和 TEM/SEM 技术阐明了 CuWO4-TiO2 的光学、结构和形貌特性。合成的 CuWO4-TiO2 催化剂的紫外可见 DRS 光谱显示出更强的可见光吸收率。CuWO4-TiO2 的 XRD 图谱显示其为三菱相纳米晶体。傅立叶变换红外光谱证实了 O-Ti-O 的功能性。从 CuWO4-TiO2 纳米复合材料的拉曼光谱中观察到与锐钛矿红移相对应的光活性带。聚光研究将这种红移归因于共催化剂异质结 CuWO4-TiO2 纳米复合材料中有助于电子/空穴对电荷分离的额外能带的升高。TEM显示,未烧结的CuWO4.MOF呈金字塔形,烧结后转变为纳米片状,而TiO2和CuWO4-TiO2则保持四方形状。以 CIP 为模型污染物,研究了 CuWO4-TiO2 催化剂的光催化活性。创新设计的 5CuWO4-TiO2 电荷分离纳米复合材料可在 pH = 6.31(自然 pH 值)和 9 的条件下,在 120 分钟的阳光照射下完全降解 10 mg L-1 的 CIP 溶液。
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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.

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来源期刊
Chemical Papers
Chemical Papers Chemical 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.
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