本文選題：耦合反應(yīng)裝置 + 光催化��； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：基于TiO2納米管的獨(dú)特結(jié)構(gòu)和優(yōu)異性能,本文采用水熱法制備了不同形貌的TiO2納米管催化劑,并通過酸性紅B廢水的光催化降解實(shí)驗(yàn)考察了 TiO2納米管在光催化氧化-膜分離耦合反應(yīng)裝置(簡(jiǎn)稱耦合反應(yīng)裝置)中的應(yīng)用性能。該耦合反應(yīng)裝置包括光催化反應(yīng)區(qū)和膜分離區(qū),且廢水在光催化反應(yīng)區(qū)底部曝氣裝置的曝氣氣流作用下通過連通管和循環(huán)管實(shí)現(xiàn)內(nèi)循環(huán)流動(dòng)。實(shí)驗(yàn)結(jié)果表明:酸性紅B廢水降解率隨著其濃度和光催化反應(yīng)區(qū)曝氣量的增加均先增加后降低,且酸性條件更利于酸性紅B的降解,適宜的廢水濃度、光催化反應(yīng)區(qū)曝氣量和pH值分別為12mg/L、0.10m3/h和3。TiO2納米管水熱反應(yīng)時(shí)間和鍛燒溫度分別從6 h增加到12 h、300℃增加到400℃時(shí),廢水的降解率增加;而分別從12h增加到24h、400℃增加到500℃時(shí)則呈現(xiàn)相反的變化規(guī)律。增大TiO2納米管投加量有利于提高其懸浮濃度,但同時(shí)會(huì)導(dǎo)致TiO2納米管的沉積現(xiàn)象,且適宜的投加量為0.8 g/L。氣沖洗對(duì)TiO2納米管懸浮濃度的影響主要發(fā)生在氣沖洗結(jié)束后的2 min內(nèi),且膜分離區(qū)中TiO2納米管懸浮濃度達(dá)到最高值所需時(shí)間比光催化反應(yīng)區(qū)的短。膜底曝氣量和氣沖洗時(shí)間間隔的增加有利于減輕膜污染;膜污染隨著水熱反應(yīng)時(shí)間的增加而增加,而隨煅燒溫度的增加先降低后增加。從保證較高光催化降解性能和最大程度減緩膜污染的原則出發(fā),適宜的膜底曝氣量、氣沖洗時(shí)間間隔、T iO2納米管催化劑制備的水熱反應(yīng)時(shí)間和煅燒溫度分別為0.035 m3/h、30 min、12 h和400℃。耦合反應(yīng)裝置間歇式運(yùn)行時(shí)的膜污染較連續(xù)式運(yùn)行時(shí)的低,且長(zhǎng)期運(yùn)行時(shí)在線反沖洗可有效減緩膜污染,從而延長(zhǎng)了膜的使用壽命。與負(fù)載型TiO2/MCM-41和商業(yè)TiO2催化劑相比,自制的TiO2納米管具有更好的光催化降解性能,且對(duì)膜的污染程度與負(fù)載型TiO2/MCM-41的相近,而明顯比商業(yè)TiO2的低。
[Abstract]:Based on the unique structure and excellent performance of TiO2 nanotubes, different morphologies of TiO2 nanotubes catalysts were prepared by hydrothermal method. The photocatalytic degradation of acid red B wastewater was studied. The application of TiO2 nanotubes in the photocatalytic oxidation-membrane separation coupling reactor was investigated. The coupling reactor includes photocatalytic reaction zone and membrane separation zone, and the wastewater flows through the connected tube and the circulation tube under the action of aeration flow at the bottom of the photocatalytic reaction zone. The results showed that the degradation rate of acid red B wastewater increased first and then decreased with the increase of its concentration and the aeration rate of photocatalytic reaction zone, and the acid condition was more favorable to the degradation of acid red B, and the appropriate wastewater concentration was obtained. When the aeration rate and pH value of photocatalytic reaction zone were 12mg / L 0.10m3 / h and 3.TiO _ 2 nanotube hydrothermal reaction time and calcination temperature increased from 6 h to 12 h ~ 300 鈩，

本文編號(hào)：2086443