本文選題：二氧化鈦 + 二硫化鉬��； 參考：《浙江理工大學(xué)》2017年碩士論文

【摘要】：中國經(jīng)濟(jì)在高速發(fā)展的同時(shí)也對(duì)中國的環(huán)境產(chǎn)生了極大的壓力,環(huán)境的污染問題也逐漸凸顯。工業(yè)廢水的大量排放對(duì)于稀缺的淡水資源也造成了強(qiáng)烈的沖擊。因此,在治理環(huán)境問題方面,尤其是紡織和生活廢水方面,光催化反應(yīng)得到了人們的重視,其中二氧化鈦更是已經(jīng)在光催化治理廢水中得到了實(shí)際的運(yùn)用。但是由于二氧化鈦本身的缺陷,降低了其催化效果。為了改善二氧化鈦催化性能的缺陷,本論文通過改性的棉纖維與二氧化鈦納米粒子復(fù)合,在氮?dú)夥諊羞M(jìn)行高溫煅燒,產(chǎn)生中空結(jié)構(gòu),制備中空超細(xì)纖維素基纖維光催化劑。通過SEM、TEM、EDS、XRD、FT-IR、XPS、EPR、BET和TG對(duì)制備的催化劑進(jìn)行了表征。隨著煅燒溫度增加,在較低的溫度范圍(600~800℃)二氧化鈦/纖維素基的空心結(jié)構(gòu)越來越明顯的。但當(dāng)溫度繼續(xù)增加從800℃到900℃,管殼變薄,直到崩塌。二氧化鈦/纖維素基復(fù)合光催化劑的光催化活性是通過評(píng)價(jià)其在可見光下降解甲基橙來測(cè)定,催化結(jié)果表明超過90%的甲基橙模擬污染源被催化降解,并證實(shí)制備二氧化鈦/纖維素基復(fù)合光催化劑具有優(yōu)良的吸收能力和協(xié)同作用。因?yàn)?催化劑的中空管狀結(jié)構(gòu)有利于增加對(duì)有機(jī)污染物的吸附能力,并加速分解有機(jī)污染物。這種協(xié)同光催化效果將具有處理廢水和治理空氣污染的效果。為了將二氧化鈦的催化活性在可見光區(qū)域的效果提升,本論文通過加入二硫化鉬進(jìn)行敏化。制備二硫化鉬/二氧化鈦負(fù)載中空超細(xì)纖維催化劑。通過FT-IR、SEM、TEM、EPS、XRD、XPS、BET和TG對(duì)制備的催化劑進(jìn)行了表征。二硫化鉬/二氧化鈦負(fù)載中空超細(xì)纖維催化劑的催化活性在可見光下降解模擬污染源亞甲基藍(lán)(MB)評(píng)價(jià),光催化結(jié)果顯示超過98%的MB被降解,并證實(shí)二硫化鉬/二氧化鈦負(fù)載中空超細(xì)纖維催化劑具有優(yōu)越的催化活性,三元復(fù)合催化劑具有較好的協(xié)同吸附和催化作用。因?yàn)槎蚧f能拓展催化劑的波長(zhǎng)響應(yīng)范圍,纖維催化劑的中空結(jié)構(gòu)增加了對(duì)有機(jī)污染物的吸附能力,加快分解有機(jī)污染物。因此,二硫化鉬的可見光敏化作用,纖維素基活性炭纖維的協(xié)同光催化效果,將有助于對(duì)廢水處理或空氣污染凈化提供較好的應(yīng)用的基礎(chǔ)。為了提升二硫化鉬/二氧化鈦負(fù)載中空超細(xì)纖維催化劑的實(shí)用效果,通過對(duì)其進(jìn)行高溫煅燒,壓片成膜,使薄膜擁有三維網(wǎng)絡(luò)結(jié)構(gòu),提升其功能性。光催化實(shí)驗(yàn)結(jié)果表明,纖維催化劑成膜后,光催化活性提高,重復(fù)使用率提高,回收更容易。說明多孔的薄膜結(jié)構(gòu)是更有利于光催化過程進(jìn)行。
[Abstract]:With the rapid development of Chinese economy, great pressure has been exerted on China's environment, and environmental pollution is becoming more and more serious. A large amount of industrial wastewater discharge to the scarcity of fresh water resources also caused a strong impact. Therefore, in the treatment of environmental problems, especially in textile and domestic wastewater, photocatalytic reaction has been paid attention to, among which titanium dioxide has been used in photocatalytic treatment of wastewater. However, due to the defects of titanium dioxide itself, the catalytic effect is reduced. In order to improve the catalytic performance of titanium dioxide, the modified cotton fiber and TIO _ 2 nanoparticles were calcined in nitrogen atmosphere at high temperature to produce hollow structure and prepare hollow ultrafine cellulose based fiber photocatalyst. The prepared catalysts were characterized by SEMMA-TEMX EDSX XRDX FT-IRT XPSN EPRE BET and TG. With the increase of calcination temperature, the hollow structure of TiO2 / Cellulose matrix becomes more and more obvious in the lower temperature range of 600 鈩，

本文編號(hào)：1780740