(廊坊師范學(xué)院 化學(xué)與材料科學(xué)學(xué)院，廊坊 065000)
摘 要: 采用電化學(xué)共沉積法制備了Ag3PO4/CNTs/Ni復(fù)合薄膜，運(yùn)用掃描電子顯微鏡(SEM)、X射線衍射(XRD)、拉曼光譜、紫外-可見漫反射光譜(UV-Vis DRS)對(duì)其進(jìn)行了形貌和結(jié)構(gòu)特性的分析, 在可見光下分別考察了復(fù)合薄膜光催化降解羅丹明B和剛果紅的性能。結(jié)果表明，最佳工藝制備的Ag3PO4/CNTs/Ni復(fù)合薄膜最外層為大小均勻的Ag3PO4球形顆粒，平均粒徑為20~30 nm，而在其內(nèi)層則為Ag3PO4和CNTs交錯(cuò)的網(wǎng)狀結(jié)構(gòu)。 Ag3PO4/CNTs/Ni復(fù)合薄膜的光催化活性和穩(wěn)定性均明顯優(yōu)于純Ag3PO4/Ni薄膜，且光催化降解羅丹明B的速率常數(shù)是純Ag3PO4/Ni薄膜的2.14倍。這都?xì)w因于CNTs 的高導(dǎo)電性及其與Ag3PO4良好的協(xié)同效應(yīng)，有效地促進(jìn)了光生電子與空穴的分離。
關(guān)鍵字: Ag3PO4/CNTs/Ni復(fù)合薄膜；電化學(xué)共沉積；光催化；羅丹明B；反應(yīng)機(jī)理
（Faculty of Chemistry and Material Science, Langfang Normal University, Langfang 065000, China）
Abstract:Ag3PO4/CNTs/Ni composite thin film electrodes were prepared using electrochemical co-deposition. The surface morphology and structural properties of the electrodes were characterized using SEM, XRD, Raman and UV-Vis DRS. The photocatalytic properties of Ag3PO4/CNTs/Ni composite thin films were investigated by degrading of rhodamine B (RhB) and congo red (CR) under visible light irradiation, respectively. The results show that spherical Ag3PO4 nanoparticles (average diameter of 20-30 nm) are distributed uniformly on the outermost layer of the composite film when the fabrication process is optimized. The inner layer is network structure which is composed of interlaced Ag3PO4 and CNTs. The Ag3PO4/CNTs/Ni composite thin films exhibit excellent photocatalytic activity with enhanced photocatalytic efficiency and good photostability compared with pure Ag3PO4/Ni thin film. The rate constant of RhB degradation over Ag3PO4/CNTs/Ni composite thin films is 2.41 times that of pure Ag3PO4/Ni thin film. The improvement is attributed to the conductive structure supported by CNTs and its good synergistic effect with Ag3PO4, which favors electron-hole separation and the removal of photogenerated electrons from the decorated Ag3PO4.
Key words: Ag3PO4/CNTs/Ni composite thin film; electrochemical co-deposition; photocatalysis; rhodamine B; reaction mechanism
