Zhang Hongxia, Azimi Hassanali, Mahmoudian M R, Ebadi Mehdi, Moradi Razieh, Shirmardi Abbas, Yousefi Ramin
State Key Laboratory of Biobased Material and Green Papermaking, College of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Science, PO Box 250353, Jinan, Shandong, China.
Department of Physics, Masjed-Soleiman Branch, Islamic Azad University, Masjed-Soleiman, Iran; Nano Research Group, Masjed-Soleiman Branch, Islamic Azad University, Masjed-Soleiman, Iran.
J Environ Manage. 2024 Nov;370:122734. doi: 10.1016/j.jenvman.2024.122734. Epub 2024 Oct 8.
This study focuses on the development of an efficient photocatalyst for degrading hospital wastewater, specifically targeting the degradation of the antibiotic tetracycline (TC). We introduce a novel 2D/2D heterostructure photocatalyst composed of graphitic carbon nitride (g-CN), functionalized with silver nanoparticles (Ag NPs) and reduced graphene oxide (rGO). The primary aim is to enhance the photocatalytic performance of g-CN through the synergistic effects of Ag NPs and rGO. The rGO/Ag/g-CN nanocomposites demonstrated remarkable photocatalytic activity, achieving over 97% TC degradation within 60 min under commercial LED light irradiation. Additionally, these photocatalysts were used to remove other antibiotics, such as doxycycline hydrochloride and ofloxacin, and it was observed that the nanocomposite effectively removed these antibiotics as well. This enhanced performance is attributed to the surface plasmon resonance (SPR) effects of Ag NPs and the electron sink properties of rGO, which were confirmed through comprehensive physicochemical characterization. Various concentrations of Ag NPs and rGO were tested to optimize the nanocomposite synthesis, with optical and electrical characterizations, including photoluminescence (PL), electrochemical impedance spectroscopy (EIS), and Mott-Schottky (M-S) measurements, revealing higher electron-hole pair generation rates and carrier concentrations in the rGO/Ag/g-CN nanocomposites compared to pristine g-CN, Ag/g-CN, and rGO/g-CN. The results demonstrate the potential of the rGO/Ag/g-CN photocatalyst as a cost-effective and scalable solution for the treatment of medical pollutants in wastewater.
本研究聚焦于开发一种高效的光催化剂用于降解医院废水，特别针对抗生素四环素（TC）的降解。我们引入了一种新型的二维/二维异质结构光催化剂，它由石墨相氮化碳（g-CN）组成，并通过银纳米颗粒（Ag NPs）和还原氧化石墨烯（rGO）进行功能化。主要目的是通过Ag NPs和rGO的协同效应来提高g-CN的光催化性能。rGO/Ag/g-CN纳米复合材料表现出显著的光催化活性，在商用LED光照射下60分钟内实现了超过97%的TC降解。此外，这些光催化剂还用于去除其他抗生素，如盐酸多西环素和氧氟沙星，并且观察到该纳米复合材料也能有效去除这些抗生素。这种增强的性能归因于Ag NPs的表面等离子体共振（SPR）效应和rGO的电子阱特性，这通过全面的物理化学表征得到了证实。测试了不同浓度的Ag NPs和rGO以优化纳米复合材料的合成，光学和电学表征，包括光致发光（PL）、电化学阻抗谱（EIS）和莫特-肖特基（M-S）测量，表明与原始的g-CN、Ag/g-CN和rGO/g-CN相比，rGO/Ag/g-CN纳米复合材料中具有更高的电子-空穴对产生率和载流子浓度。结果表明，rGO/Ag/g-CN光催化剂具有作为一种经济高效且可扩展的废水医疗污染物处理解决方案的潜力。
