Unveiling the impact of nitrogen-doped graphene quantum dots on improving the photocatalytic performance of CuWO4 nanocomposite

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Parthivi Aloni, Prashanth Venkatesan, Arun Prakash Sundaresan, Deblina Roy, Rohit Kumar Ranjan, Ankit Sharma, Ruey-An Doong, N. Clament Sagaya Selvam
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Abstract

In this study, nitrogen-doped graphene quantum dots (NGQD) decorated CuWO4 nanocomposite (NGQD-CuWO4) were synthesized for enhanced photocatalytic tetracycline (TC) degradation under visible light irradiation. The incorporation of NGQDs significantly increased light absorption, narrowed the band gap, and improved charge transfer in CuWO4, leading to enhanced photocatalytic efficiency. TEM analysis confirmed the successful integration of NGQDs with CuWO4, showing uniform dispersion and lattice fringes, while Raman spectra revealed the characteristic D and G bands of NGQDs, indicating their graphene-like properties. The optimal NGQD loading (3NGQD-CuWO4) achieved a degradation efficiency of 99 % within 90 min, exhibiting a three-fold increase in performance compared to pure CuWO4. Photocurrent measurements indicated that incorporating NGQD enhanced the charge separation in CuWO4 displaying the highest photocurrent density. The lowest charge transfer resistance observed in the hybrid photocatalyst is confirmed by electrochemical impedance spectroscopy (EIS), indicating the significant role of NGQD in increasing the charge transfer kinetics. Optical studies further demonstrated a significant red shift in the absorption spectrum and a reduction in the band gap from 2.43 eV for pure CuWO4 to 2.29 eV for the 3NGQD-CuWO4 composite. Kinetic studies indicated a pseudo-first-order reaction with a rate constant three times higher for NGQD-CuWO4 compared to CuWO4 alone. Hydroxyl radicals (•OH) were identified as the main reactive species responsible for degradation. This work highlights that NGQD incorporation makes CuWO4 an efficient, stable, and promising photocatalyst for environmental applications, particularly in treating pharmaceutical-contaminated water.

Abstract Image

揭示掺氮石墨烯量子点对提高 CuWO4 纳米复合材料光催化性能的影响
本研究合成了氮掺杂石墨烯量子点(NGQD)装饰的 CuWO4 纳米复合材料(NGQD-CuWO4),用于在可见光照射下增强光催化降解四环素(TC)。NGQD 的加入显著增加了光吸收,缩小了带隙,并改善了 CuWO4 中的电荷转移,从而提高了光催化效率。TEM 分析证实了 NGQDs 与 CuWO4 的成功结合,显示出均匀的分散性和晶格边缘,而拉曼光谱则显示出 NGQDs 特有的 D 和 G 波段,表明其具有类似石墨烯的特性。最佳 NGQD 负载(3NGQD-CuWO4)在 90 分钟内的降解效率达到 99%,与纯 CuWO4 相比性能提高了三倍。光电流测量结果表明,加入 NGQD 增强了 CuWO4 中的电荷分离,显示出最高的光电流密度。电化学阻抗光谱(EIS)证实了在混合光催化剂中观察到的最低电荷转移电阻,这表明 NGQD 在提高电荷转移动力学方面发挥了重要作用。光学研究进一步表明,3NGQD-CuWO4 复合材料的吸收光谱发生了显著的红移,带隙从纯 CuWO4 的 2.43 eV 减小到 2.29 eV。动力学研究表明,与单独的 CuWO4 相比,NGQD-CuWO4 的假一阶反应速率常数高出三倍。羟基自由基 (-OH) 被确定为导致降解的主要反应物。这项工作突出表明,NGQD 的加入使 CuWO4 成为一种高效、稳定、有前途的光催化剂,可用于环境应用,特别是处理受药物污染的水。
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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