【摘要】：在進入21世紀后,人類可開發(fā)的能源資源已經(jīng)嚴重不足,并且大量的環(huán)境污染問題都是來自于能源的利用,這些都嚴重影響了人類的生存。相對其它化石能源而言,太陽能是大自然給予人類的巨大財富,它儲量豐富,清潔安全,廉價易得。現(xiàn)在國內(nèi)外的研究者們越來越重視太陽能激發(fā)的半導體光催化技術(shù),該技術(shù)不但可以解決能源問題,在太陽能驅(qū)動下裂解水,從而得到清潔能源氫氣;也可以解決環(huán)境問題,將水體中的有機污染物降解,轉(zhuǎn)化為二氧化碳和水。因此,半導體光催化技術(shù)被看作是最有應用潛力的太陽能技術(shù)之一。本論文中,我們以g-C_3N_4,草酸亞鐵,BiOI作為催化劑,在可見光下降解羅丹明B和甲基橙,通過我們的研究和創(chuàng)新,他們都有較好的可見光催化性能。g-C_3N_4在可見光下很難降解甲基橙,當在g-C_3N_4體系中加入少量草酸,甲基橙可以在很短時間內(nèi)被徹底降解。將草酸與塊狀g-C_3N_4體系結(jié)合可以很大的提高g-C_3N_4光催化降解甲基橙的性能。這可能是因為有草酸參與的g-C_3N_4體系會使分子氧產(chǎn)生過氧化氫。在草酸輔助下用草酸亞鐵作為催化劑降解羅丹明B和甲基橙時,我們發(fā)現(xiàn)在草酸存在的情況下,光降解速率.以被很大的提高。因此,我們對它的光催化機理也進行了分析,認為在可見光驅(qū)動催化體系中草酸是一種獨特且高效的犧牲因子。我們采用一種新穎的研磨方法制備β-草酸亞鐵,該方法是將硫酸亞鐵和草酸混合后用簡單的研磨法研磨,得到新穎的納米片狀β-草酸亞鐵,然后在100℃條件下沉化10小時,使得β-草酸亞鐵轉(zhuǎn)化為α-草酸亞鐵。通過它們在可見光下對羅丹明B的降解能力來估算它們的光催化活性。實驗證明,它們都具有良好的光催化活性。在乙酸鈉輔助下,在不同溶劑體系中制備的所有BiOI都是小且薄的納米片,在XRD圖中(110)/(102)的強度比率比標準值(JCPDS card no.10-0445)大很多,表明了其優(yōu)先生長方向是(110)方向。它們在可見光照射下的光催化降解甲基橙的能力比沒有乙酸鈉輔助的時候高。因此,這為制備具有高光催化活性的暴露面為{001}的BiOI納米片提供了新的途徑。
[Abstract]:After entering the 21st century, the energy resources that can be exploited by human beings have been seriously insufficient, and a large number of environmental pollution problems come from the use of energy, which have seriously affected the survival of human beings. Compared with other fossil energy, solar energy is a great wealth given by nature. It is abundant, clean, safe and cheap. Now researchers at home and abroad are paying more and more attention to the semiconductor photocatalysis technology, which can not only solve the energy problem, but also can solve the environmental problems. The organic pollutants in the water are degraded and converted into carbon dioxide and water. Therefore, semiconductor photocatalytic technology is regarded as one of the most promising solar energy technologies. In this paper, we use g-C3N4, ferrous oxalate, BiOI as catalyst, and decompose Rhodamine B and methyl orange in visible light. Through our research and innovation, they all have better catalytic performance in visible light. It is very difficult for g-C_3N_4 to degrade methyl orange under visible light. When a small amount of oxalic acid is added to g-C_3N_4 system, methyl orange can be completely degraded in a very short time. The combination of oxalic acid and bulk g-C_3N_4 system can greatly improve the photocatalytic degradation of methyl orange by g-C_3N_4. This may be due to the presence of oxalic acid in the g-C_3N_4 system, which causes molecular oxygen to produce hydrogen peroxide. In the presence of oxalic acid, the photodegradation rate of Rhodamine B and methyl orange was found when ferrous oxalate was used as catalyst. To be greatly improved. Therefore, the photocatalytic mechanism of oxalic acid is also analyzed. It is considered that oxalic acid is a unique and efficient sacrificial factor in visible light driven catalytic system. A novel grinding method was used to prepare ferrous 尾 -oxalate. The method was to grind ferrous sulfate and oxalic acid with a simple grinding method to obtain novel nano-flake 尾 -oxalate, and then sink at 100 鈩，

本文編號：2281154