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  本文選題：光催化　切入點：可見光　出處：《華東理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：半導體光催化技術能夠利用太陽光將水中有機污染物完全降解,具有操作簡單、成本低、無二次污染等優(yōu)點,是一種"綠色"的環(huán)境凈化技術。鉍基半導體材料具有良好的光催化性能,但較窄的可見光吸收范圍和較低的量子利用率極大地限制了其實際應用。本論文通過半導體復合的手段對鉍基材料進行改性,以增強對染料污染物的吸附能力、拓寬光響應范圍及加快光生電子-空穴對的分離速率,從而提高其可見光降解有機污染物的活性和穩(wěn)定性。本論文主要研究內容如下:在不加入有機表面配體的條件下,采用溶劑熱和沉積-原位光還原法合成納米片狀結構Ag/AgCl/Bi2OCO3等離子體光催化劑。相比于Ag/AgCl和Bi2O2CO3,Ag/AgCl/Bi2O2CO3對羅丹明B(RhB)和亞甲基藍(MB)的吸附能力和可見光催化效率明顯提高。當Ag/AgCl負載量為20 wt%時,此催化劑對RhB展現(xiàn)出較高的可見光催化活性和穩(wěn)定性,同時也表現(xiàn)出良好的可見光降解苯酚性能。Ag納米粒子表面等離子體共振效應及Ag/AgCl和Bi2O2CO3的協(xié)同作用使20 wt%Ag/AgCl/Bi2O2CO3擁有優(yōu)異的光催化性能。通過溫和的溶劑熱法制備分層微球結構的Bi2Mo06,并在此基礎上合成了 Z型Ag/AgBr/Bi2MoO6光催化劑。在可見光照射下Ag/AgBr/Bi2MoO6對RhB呈現(xiàn)出較優(yōu)的光催化效率(0.180min-1),明顯高于 Ag/AgBr(0.071 min-1)和 Bi2MoO6(0.008 min-1),且具有良好的穩(wěn)定性。同時,Ag/AgBr/Bi2MoO6對MB和苯酚都表現(xiàn)出高的可見光降解活性,說明該材料是一種廣普高效的可見光光催化劑。該催化劑光催化活性的增強歸因于AgBr和Bi2MoO6合適的能帶位置以及體系中的Ag納米粒子作為電子傳輸介質而構建的Z型光催化反應體系。
[Abstract]:Semiconductor photocatalytic technology can completely degrade organic pollutants in water by using solar light, which has the advantages of simple operation, low cost, no secondary pollution and so on. Bismuth based semiconductor materials have good photocatalytic properties. However, narrow visible light absorption range and low quantum utilization rate greatly limit its practical application. In this paper, bismuth based materials are modified by semiconductor recombination to enhance the adsorption capacity of dye pollutants. In order to improve the activity and stability of photodegradation of organic pollutants by broadening the photoresponse range and accelerating the separation rate of photogenerated electron-hole pairs, the main contents of this thesis are as follows: without the addition of organic surface ligands, Nano-flake Ag/AgCl/Bi2OCO3 plasma photocatalysts were synthesized by solvothermal and in situ photoreduction. Compared with Ag/AgCl and Bi2O2CO3 AgClP / Bi2O2CO3, the adsorption capacity and visible photocatalytic efficiency of Rhodamine Bhl / Bi2O2CO3 for Rhodamine (RhB) and methylene blue (MBB) were significantly improved when Ag/AgCl was used. When the load is 20 wt%, The catalyst exhibited high visible light activity and stability for RhB. The surface plasmon resonance (SPR) effect of Ag nanoparticles and the synergistic effect of Ag/AgCl and Bi2O2CO3 made 20 wt%Ag/AgCl/Bi2O2CO3 have excellent photocatalytic performance. The layered microparticles were prepared by mild solvothermal method. Bi2Mo06. on the basis of this, Z type Ag/AgBr/Bi2MoO6 photocatalyst was synthesized. The photocatalytic efficiency of Ag/AgBr/Bi2MoO6 to RhB under visible light irradiation is 0.180min-1, which is obviously higher than that of Ag/AgBr(0.071 min-1) and Bi2MoO6(0.008 min-1n, and it has good stability. At the same time, Ag/AgBr/Bi2MoO6 / AgBr-Bi2MoO6 pairs have good stability. MB and phenol both showed high visible light degradation activity. The results show that this material is a widely used and efficient visible photocatalyst. The enhancement of photocatalytic activity of the catalyst is attributed to the appropriate band positions of AgBr and Bi2MoO6 and the Z formed by Ag nanoparticles in the system as electron transport media. Type A photocatalytic reaction system.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36

【參考文獻】

相關期刊論文 前1條

1 許嘉寧;陳燕;;我國水污染現(xiàn)狀[J];廣東化工;2014年03期

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本文編號：1640343