本文選題：粉煤灰 + 沸石分子篩　； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：粉煤灰作為眾多發(fā)電廠的燃煤鍋爐所排放出的廢渣,也是非常寶貴的可利用資源,而使用粉煤灰作為主要原料,合成沸石分子篩,就成為了粉煤灰應(yīng)用的一個(gè)很重要的方面。粉煤灰沸石分子篩以它所具有的良好的吸附性、分離作用以及在離子交換、催化等方面的重要應(yīng)用而廣泛受人們所青睞。以二氧化鈦為主的光催化處理技術(shù)是一種具有高處理率、低能消耗、無(wú)二次污染、工藝設(shè)備簡(jiǎn)單的新型廢水處理技術(shù),但由于二氧化鈦的顆粒較小,難回收,容易形成二次污染,用沸石分子篩做載體就可以很好的將其固定起來(lái)。本論文重點(diǎn)研究?jī)蓚�(gè)方面的內(nèi)容,一是如何以粉煤灰作為主要原材料制備沸石分子篩,二是如何將制備好的沸石分子篩與二氧化鈦有效負(fù)載。 首先所采用的制備沸石分子篩的方法是堿熔融水熱法,以預(yù)處理過(guò)的粉煤灰作為主要原材料,加堿熔融粉煤灰合成沸石分子篩。通過(guò)實(shí)驗(yàn)來(lái)研究不同灰堿比、不同焙燒溫度及時(shí)間、不同水熱晶化溫度及時(shí)間等因素對(duì)合成沸石分子篩影響。利用X射線衍射(XRD)、掃描電鏡(SEM)、比表面積測(cè)試(BET)等方法表征產(chǎn)物的形貌、物相、比表面積等并計(jì)算產(chǎn)率。測(cè)試結(jié)果表明,當(dāng)NaOH:粉煤灰：Na2CO3為1.2：1：0.3,煅燒溫度是550℃,煅燒時(shí)間是70min,晶化溫度是90℃,晶化時(shí)間是24小時(shí),所制得沸石分子篩主要是Na-X型,BET測(cè)定比表面積是90.123m2/g,產(chǎn)率為56.9%。 以沸石分子篩作為載體來(lái)負(fù)載二氧化鈦,根據(jù)所使用的原料不同總體采用了三種實(shí)驗(yàn)方案。以乙醇和鈦酸四丁酯為主要原料制備負(fù)載型TiO2/沸石分子篩并討論分子篩加入的先后順序?qū)?shí)驗(yàn)結(jié)果的影響,結(jié)果表明用原位溶膠凝膠法負(fù)載二氧化鈦所得產(chǎn)品形貌最佳,比表面積可達(dá)145.782m2/g,降解甲基橙的光催化率可高達(dá)50.2%；以鈦酸四丁酯和異丙醇為主要原料制備負(fù)載型TiO2/沸石分子篩并討論負(fù)載量的多少對(duì)實(shí)驗(yàn)結(jié)果的影響,結(jié)果表明40%TiO2/沸石分子篩比表面積最大,可達(dá)151.452m2/g,降解甲基橙的光催化率可高達(dá)59.8%；以異丙醇鈦和異丙醇作為主要原料制備負(fù)載型TiO2/沸石分子篩并討論焙燒溫度對(duì)產(chǎn)品的影響,結(jié)果表明500℃的焙燒溫度最佳,產(chǎn)品比表面積可達(dá)149.3m2/g,降解甲基橙的光催化率可達(dá)51.2%。對(duì)比這三種方案,本論文里所采用鈦酸四丁酯與異丙醇制得的產(chǎn)品比表面積最大,光催化性能最好。
[Abstract]:Fly ash, as a waste residue discharged from coal-fired boilers in many power plants, is also a valuable available resource, and the use of fly ash as the main raw material to synthesize zeolite molecular sieve has become a very important aspect of the application of fly ash.Fly ash zeolites have been widely used in many fields such as adsorption, separation, ion exchange, catalysis and so on.The photocatalytic treatment technology based on titanium dioxide is a new type of wastewater treatment technology with high treatment rate, low energy consumption, no secondary pollution and simple process equipment. However, it is difficult to recover titanium dioxide because of its small particle size.It is easy to form secondary pollution and can be well immobilized with zeolite molecular sieve as carrier.This thesis focuses on two aspects: one is how to use fly ash as the main raw material to prepare zeolite molecular sieve, the other is how to load the prepared zeolite molecular sieve with titanium dioxide.Firstly, the method of preparing zeolite molecular sieve is alkaline melt hydrothermal method, the pretreated fly ash is used as the main raw material, and alkali melt fly ash is added to synthesize zeolite molecular sieve.The effects of different lime-base ratio, calcination temperature and time, hydrothermal crystallization temperature and time on the synthesis of zeolites were studied.The morphology, phase and specific surface area of the product were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and specific surface area test (BET), and the yield was calculated.The test results show that when NaOH: fly ash: Na2CO3 is 1.2: 1: 0.3, calcination temperature is 550 鈩，

本文編號(hào)：1754953