(云南大學(xué) 云南省高校納米材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室，昆明 650091)
摘 要: 采用溶膠−凝膠法結(jié)合微波化學(xué)法制備高活性可見(jiàn)光響應(yīng)型鐠(Pr)和氮(N)共摻雜納米TiO2光催化劑(Pr-N-TiO2)。通過(guò)XRD、FT-IR、UV-Vis和TEM等手段對(duì)Pr-N-TiO2光催化劑樣品進(jìn)行表征和分析，并以亞甲基藍(lán)(MB)作為目標(biāo)降解物，考察Pr-N-TiO2光催化劑對(duì)MB的光催化降解效果。結(jié)果表明：Pr和N共摻雜TiO2能有效地抑制TiO2的晶粒生長(zhǎng)，共摻雜離子之間的協(xié)同作用使得Pr-N-TiO2光催化劑的光譜吸收閾值波長(zhǎng)發(fā)生紅移，熒光光譜強(qiáng)度明顯降低，光催化活性顯著提高；在日光燈下，6 h內(nèi)，Pr-N-TiO2光催化劑對(duì)MB的光催化降解率達(dá)92.81%，明顯優(yōu)于Degussa P25的(45.01%)。
關(guān)鍵字: 納米TiO2；光催化劑；共摻雜；光催化活性；微波化學(xué)法
nitrogen co-doped nano-titanium dioxide photocatalyst
（Yunnan Key Laboratory of Nanomaterials and Technology, Yunnan University, Kunming 650091, China）
Abstract:The powders of high efficient visible-light-induced nano-TiO2 co-doped with praseodymium and nitrogen (Pr-N-TiO2) were prepared by sol-gel and microwave chemical methods. The samples were characterized by X-ray diffractometry (XRD), FT-IR, UV-Vis and TEM, respectively. The photocatalytic activity of samples was investigated by measuring the degradation rate of methyl blue (MB) under the irradiation of fluorescent lamp. The results indicate that Pr and N co-doping efficiently restrains the growth of TiO2 crystalline size. The adsorption edge of visible light is red shifted, the phosphorescence fluorescence (PL) spectra intensity of sample is evidently depressed, and the photocatalytic activity of the sample greatly increases, because of the synergic effect of the co-doping ions. The degradation rate of MB by Pr-N-TiO2 photocalatyst in 6 h is 92.81%, which is much higher than that of Degussa P25 (45.01%).
Key words: nano-TiO2; photocatalyst; co-doping; photocatalytic activity; microwave chemical method
