【摘要】：TiO2具有光催化活性高、氧化能力強(qiáng)、化學(xué)性質(zhì)穩(wěn)定、成本低、無毒等優(yōu)點,在抗菌、除臭以及環(huán)境凈化等方面應(yīng)用廣泛。但TiO2作為催化劑時,太陽能利用率低,光生載流子易復(fù)合,且回收使用困難,使其在工業(yè)化應(yīng)用方面受到較大限制。因此,需要對納米TiO2進(jìn)行摻雜改性和負(fù)載化。通過摻雜可以引起光催化劑對可見光的響應(yīng),并且能降低光生載流子的復(fù)合幾率；而負(fù)載能夠有效防止納米粒子產(chǎn)生團(tuán)聚,便于回收再利用。本論文將摻雜改性TiO2涂覆到ACF表面,重點研究了所制得的材料在模擬太陽光下的光催化活性和重復(fù)使用效果。主要研究內(nèi)容和結(jié)論如下：1、以粘膠基非織造布為原料,用磷酸活化法制備出了吸附性能較高的ACF,測試得到的ACF的吸附性能和得率。結(jié)果表明：磷酸質(zhì)量濃度40%,浸漬時間16h,活化溫度450℃,活化時間100min,所得ACF對亞甲基藍(lán)的吸附性能最好,亞甲基藍(lán)吸附量達(dá)到239.2mg/L,產(chǎn)品得率為39.4%。影響ACF對亞甲基藍(lán)吸附能力的因素權(quán)重大小為C(活化溫度)B(浸漬時間)D(活化時間)A(磷酸濃度)。2、將粘膠基非織造布分別浸入N、Ni單獨摻雜及N、Ni共摻雜Ti02溶膠中,然后通過磷酸浸漬、高溫煅燒制得了摻雜TiO2/ACF光催化材料,并對光催化材料進(jìn)行XRD、 SEM、FT-IR以及UV-Vis DRS表征。結(jié)果表明光催化材料成型良好,幾乎沒有纖維斷裂,且具有明顯的三維立體結(jié)構(gòu)。摻雜Ti02顆粒均勻分布在ACF表面。在制備的光催化材料中,TiO2均為銳鈦礦型和金紅石型混晶結(jié)構(gòu),并且粒徑較小。N和Ni共摻雜產(chǎn)生了協(xié)同效應(yīng),使試樣的光吸收曲線發(fā)生紅移,而且減少了光生載流子間的復(fù)合,提高了光量子利用效率。3、制備了N摻雜TiO2/ACF光催化材料,研究了N摻雜量、煅燒溫度和材料重復(fù)使用對N摻雜TiO2/ACF光催化活性的影響。結(jié)果表明,N摻雜量對材料的光催化性能有著較大的影響,當(dāng)N摻雜量為0.5光催化性能較好。在300℃～600℃范圍內(nèi),隨著煅燒溫度的升高,亞甲基藍(lán)溶液的脫色率呈現(xiàn)先上升后下降的趨勢。隨著浸漬次數(shù)的增加,亞甲基藍(lán)溶液的脫色率先增加后下降。在500℃煅燒100min, N摻雜量為0.5的光催化材料對亞甲基藍(lán)溶液的脫色率較高；連續(xù)使用3次,脫色率仍高于9O%。4、制備了N、Ni共摻雜TiO2/ACF光催化材料,研究了不同因素對N、Ni共摻雜TiO2/ACF光催化性能的影響。結(jié)果表明：粘膠基非織造布浸漬3次N摻雜量為0.5,Ni摻入量為0.01的溶膠,并在500℃條件下煅燒,獲得光催化材料N0.5Ni0.01TiO2/ACF-3,其光催化活性最好,光照60min時,亞甲基藍(lán)脫色率達(dá)到96.2%。并且重復(fù)使用N0.5Ni0.01TiO2/ACF-3試樣5次后,對亞甲基藍(lán)溶液的脫色率仍然在90%以上。
[Abstract]:TiO2 has the advantages of high photocatalytic activity, strong oxidation ability, stable chemical properties, low cost, non-toxic and so on. It is widely used in antibacterial, deodorization and environmental purification. However, when TiO2 is used as catalyst, solar energy utilization is low, photogenerated carriers are easy to be recombined, and recycling is difficult, which makes it limited in industrial application. Therefore, it is necessary to modify and support nanometer TiO2. Doping can cause the photocatalyst to respond to visible light and reduce the recombination probability of photogenerated carriers, while the loading can effectively prevent the aggregation of nanoparticles and facilitate the recovery and reuse. In this paper, the doped modified TiO2 was coated on the surface of ACF, and the photocatalytic activity and reusing effect of the prepared materials under simulated solar light were studied. The main contents and conclusions are as follows: 1. The adsorption properties and yield of ACF with high adsorption property were prepared by phosphoric acid activation method using viscose based nonwovens as raw material. The results showed that the methylene blue adsorbed by ACF was the best, the adsorption capacity of methylene blue was 239.2 mg / L, the yield of product was 39.4%, the mass concentration of phosphoric acid was 40%, the impregnation time was 16 h, the activation temperature was 450 鈩，

本文編號：2419936