State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Chemosphere. 2020 Mar;242:125201. doi: 10.1016/j.chemosphere.2019.125201. Epub 2019 Oct 24.
Photocatalytic disinfection with high performance is thought to be a promising way for water purification. Herein, plasmonic Ag doped urea-derived graphitic carbon nitride (g-CN) composites were fabricated via in-situ photo-deposition at room temperature as the visible-light photocatalyst. Scan electron microscopy and transmission electron microscopy images showed the uniform dispersion of Ag nanoparticles on the surface of g-CN sheet, which facilitated the synergistic effect of antibacterial performance from Ag and photocatalytic property from Ag/g-CN composites. Photocatalytic water disinfection against Escherichia coli with visible light was performed to demonstrate the improved photocatalytic property with assistance of Ag. The 3-Ag/g-CN exhibited the best bactericidal performance by inactivating all bacteria within 120 min with damaged cell membranes of Escherichia coli observed by scan electron microscopy and transmission electron microscopy images. Photoluminescence spectra, steady-state surface photovoltage spectra, photocurrent response, and electrochemical impedance spectra results revealed that Ag nanoparticles inhibited the recombination of photo-generated e and h pairs and further reinforced the photocatalytic performance of g-CN. Scavenger experiments indicated that h produced on valence band of g-CN dominated the photocatalytic disinfection process against Escherichia coli. This work further proved Ag/g-CN showed great potential in photocatalytic water disinfection under visible-light irradiation.
光催化消毒被认为是一种很有前途的水净化方法。本文通过室温下的原位光沉积法制备了等离子体 Ag 掺杂尿素衍生的石墨相氮化碳（g-CN）复合材料，作为可见光光催化剂。扫描电子显微镜和透射电子显微镜图像显示，Ag 纳米粒子均匀分散在 g-CN 片的表面上，这促进了 Ag 的抗菌性能和 Ag/g-CN 复合材料的光催化性能的协同效应。通过可见光对大肠杆菌进行光催化水消毒实验，证明了 Ag 的存在提高了光催化性能。3-Ag/g-CN 在 120 min 内就能完全灭活大肠杆菌，扫描电子显微镜和透射电子显微镜图像显示，大肠杆菌的细胞膜受到了破坏，表现出了最好的杀菌性能。光致发光光谱、稳态表面光电压谱、光电流响应和电化学阻抗谱结果表明，Ag 纳米粒子抑制了光生电子和空穴对的复合，进一步增强了 g-CN 的光催化性能。猝灭实验表明，g-CN 价带上产生的 h 对大肠杆菌的光催化消毒过程起主导作用。这项工作进一步证明了 Ag/g-CN 在可见光照射下的光催化水消毒方面具有很大的潜力。
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