【摘要】：盡管社會(huì)經(jīng)濟(jì)在不斷地發(fā)展,但在此過(guò)程中導(dǎo)致的環(huán)境污染的問(wèn)題也日益嚴(yán)重,其中水污染的治理尤其引人關(guān)注。近些年來(lái),半導(dǎo)體光催化技術(shù)在污水處理領(lǐng)域展現(xiàn)出極大的應(yīng)用前景,因而受到人們廣泛的關(guān)注。Bi2O3由于優(yōu)良的性質(zhì)及廣泛的應(yīng)用性使其成為半導(dǎo)體光催化劑領(lǐng)域優(yōu)先研究的材料之一。但是,Bi2O3在光催化過(guò)程中,其光生電子-空穴對(duì)的復(fù)合很快,這就嚴(yán)重影響了Bi2O3的光催化性能。鑒于此情況,降低Bi2O3的光生載流子復(fù)合幾率、提高其光催化性能成為研究的熱點(diǎn)。其中Bi2O3復(fù)合材料是一種行之有效的手段。本文通過(guò)共沉淀法制備了納米Bi2O3,同時(shí)通過(guò)復(fù)合F-TiO2以及Ag2O合成Bi2O3/F-TiO2和Bi2O3/Ag2O復(fù)合物,使Bi2O3的光生電子-空穴對(duì)的復(fù)合得以抑制,光催化性能得以提高。主要研究?jī)?nèi)容如下：1.采用共沉淀法,通過(guò)加入氨水到Bi2O3前驅(qū)體溶液形成沉淀,再經(jīng)過(guò)空氣中熱處理制得Bi2O3,同時(shí)研究了熱處理溫度對(duì)其光催化性能的影響。實(shí)驗(yàn)結(jié)果表明：(1)熱處理溫度對(duì)Bi2O3的形貌和光催化性能有著重要的影響；(2)當(dāng)熱處理溫度為400℃時(shí),合成的Bi2O3具有最佳的可見光催化性能,對(duì)甲基橙(Methyl Orange, MO)的降解率可達(dá)到86%(180 min)；(4)這種優(yōu)異的光催化性能應(yīng)該歸因于Bi2O3良好的可見光吸收以及相對(duì)較低的光生載流子的復(fù)合。2.通過(guò)溶膠凝膠法合成F-TiO2,再將F-TiO2加入到Bi2O3前驅(qū)體溶液中,得到沉淀物,熱處理后制得Bi2O3/F-TiO2復(fù)合物,并將其用于可見光催化領(lǐng)域。實(shí)驗(yàn)結(jié)果表明：(1)復(fù)合F-TiO2能夠增強(qiáng)Bi2O3的光催化性能；(2)Bi2O3/F-TiO2光催化性能與復(fù)合物中F-TiO2的摻雜量有關(guān)；(3)當(dāng)F-TiO2摻雜量為12wt.%時(shí),Bi2O3/F-TiO2復(fù)合物對(duì)MO的光催化降解率達(dá)到最大值為96%(180分鐘)；(4)光催化性能的增強(qiáng)主要?dú)w因于F-TiO2的引入增強(qiáng)了光吸收及降低了光生電子-空穴對(duì)的復(fù)合。3.采用共沉淀法合成Bi2O3,然后將Bi2O3加入到AgNO3溶液中,通過(guò)添加NaOH改變?nèi)芤旱膒H,從而合成Bi2O3/Ag2O復(fù)合物,并將其用于可見光催化領(lǐng)域。實(shí)驗(yàn)結(jié)果表明：(1)復(fù)合Ag2O能夠明顯增強(qiáng)Bi2O3的光催化性能；(2)Bi2O3/Ag2O光催化性能與復(fù)合物中Ag2O的摻雜量有關(guān)；(3)當(dāng)溶液中AgNO3量為0.03mol時(shí),Bi2O3/Ag2O復(fù)合物對(duì)MO的光催化降解率達(dá)到最大為91%(60min)；(4)光催化性能的增強(qiáng)主要?dú)w因于Ag2O的引入增強(qiáng)了光吸收及降低了光電子-空穴對(duì)的復(fù)合。
[Abstract]:In spite of the continuous development of social economy, the environmental pollution caused by this process is becoming more and more serious, especially the treatment of water pollution. In recent years, semiconductor photocatalytic technology has shown great application prospects in the field of wastewater treatment. Because of its excellent properties and wide application, Bi2O3 has become one of the priority materials in the field of semiconductor photocatalyst. However, in the process of photocatalysis, the photocatalytic properties of Bi2O3 are greatly affected by the combination of photogenerated electron-hole pairs. In view of this situation, reducing the recombination probability of photogenerated carriers and improving the photocatalytic performance of Bi2O3 has become a hot topic. Bi2O3 composite is an effective method. In this paper, nanometer Bi2O3, was prepared by coprecipitation and Bi2O3/F-TiO2 and Bi2O3/Ag2O complexes were synthesized by composite F-TiO2 and Ag2O. The photoelectron hole pair of Bi2O3 was inhibited and the photocatalytic performance was improved. The main contents are as follows: 1. The effect of heat treatment temperature on the photocatalytic properties of Bi2O3 precursor solution was studied by co-precipitation method by adding ammonia into the solution of Bi2O3, precursor and then heat treated in air. The experimental results show that: (1) the heat treatment temperature has an important effect on the morphology and photocatalytic performance of Bi2O3; (2) when the heat treatment temperature is 400 鈩，

本文編號(hào)：2320338