發(fā)布時間：2018-05-06 01:18

  本文選題：鎢酸鉍 + 石墨烯�。� 參考：《青島科技大學(xué)》2017年碩士論文

【摘要】：印染廢水化學(xué)需氧量(COD)高,水量大、色度高、成分復(fù)雜且難生化降解,對人類健康、安全危害極大,是最難處理的工業(yè)廢水之一,傳統(tǒng)的處理辦法很難使出水水質(zhì)達(dá)到標(biāo)準(zhǔn)。光催化技術(shù)不僅可以利用清潔無污染的太陽能,還可在溫和條件下將絕大部分有機物氧化降解且不會產(chǎn)生二次污染,極大降低了有機污染物對人體的危害,保障了人類的生命財產(chǎn)安全。鎢酸鉍(Bi_2WO_6)作為目前可見光催化活性最好的半導(dǎo)體材料,無論是材料本身還是原料均安全無毒,制備方法也安全有效。本文主要研究了可見光催化劑Bi_2WO_6及其復(fù)合物Bi_2WO_6/氧化石墨烯(GO)、Bi_2WO_6/氮摻雜石墨烯(NG)的制備及其在氙燈模擬日光條件下對四種模擬染料廢水的降解效果,并致力于保護(hù)人類健康及生態(tài)平衡。具體內(nèi)容如下:1.以Na_2WO_4·2H_2O和Bi(NO_3)_3·5H_2O為原料,采用水熱法制備了三維花瓣狀Bi_2WO_6光催化劑,優(yōu)化了最佳制備條件,并利用SEM、XRD等方法對產(chǎn)品的結(jié)構(gòu)和形貌進(jìn)行了表征,實驗結(jié)果表明:在前驅(qū)液pH=1,160℃下水熱反應(yīng)24h制備的Bi_2WO_6具有最佳光催化活性;同時研究了催化劑的用量、羅丹明B的初始濃度、光強以及反應(yīng)時間等條件對Bi_2WO_6可見光催化降解羅丹明B效果的影響,結(jié)果發(fā)現(xiàn)在氙燈功率為500W的光照下,向濃度為1.0×10-5 mol·L-1羅丹明B溶液中加入0.05 g Bi_2WO_6,反應(yīng)60 min時去除率達(dá)到最大,可達(dá)90.1%。2.采用Hummers法制備GO,以GO和Bi_2WO_6為原料采用一鍋法制備不同質(zhì)量分?jǐn)?shù)的Bi_2WO_6/GO復(fù)合光催化劑,利用TEM、XRD等表征手段對復(fù)合物的形貌和結(jié)構(gòu)進(jìn)行了分析,并在最佳光催化反應(yīng)條件下考察了復(fù)合物對四種模擬染料廢水的降解效果,實驗結(jié)果表明,160℃下水熱反應(yīng)12 h所得的GO質(zhì)量分?jǐn)?shù)為3%的Bi_2WO_6/GO復(fù)合光催化劑對濃度為1.0×10-5 mol·L-1的甲基橙溶液降解效果最好,達(dá)96.1%,對其余染料降解率也均在95%左右。3.以GO和Bi_2WO_6為原料,以尿素為氮源,采用一鍋法制備了不同質(zhì)量分?jǐn)?shù)的Bi_2WO_6/NG復(fù)合光催化劑,利用TEM、XRD等方法對復(fù)合物的形貌結(jié)構(gòu)進(jìn)行了分析,并在最佳光催化條件下考察了復(fù)合物對四種模擬染料廢水的降解效果,實驗結(jié)果表明,160℃下水熱反應(yīng)12 h所得NG質(zhì)量分?jǐn)?shù)為20%的Bi_2WO_6/NG復(fù)合物對濃度為1.0×10-5 mol·L-1的羅丹明B降解效果最好,達(dá)98.9%,對其余染料降解率也均在98%左右。4.Bi_2WO_6及其復(fù)合物對有機污染物極高的降解率,不僅保護(hù)了生態(tài)環(huán)境平衡,也降低了對人類健康安全的威脅,使得人類、健康、資源更加和諧可持續(xù)發(fā)展。在可見光照射下催化降解染料廢水,實際應(yīng)用時以太陽光為光源,可以避免電源的使用,更加安全環(huán)保。
[Abstract]:Printing and dyeing wastewater has high chemical oxygen demand (COD), large amount of water, high chroma, complex composition and difficult biodegradability. It is one of the most difficult industrial wastewater to treat because of its great harm to human health and safety. The traditional treatment method is difficult to make the effluent quality up to the standard. Photocatalytic technology can not only utilize clean and pollution-free solar energy, but also oxidize and degrade most organic matter under mild conditions without secondary pollution, which greatly reduces the harm of organic pollutants to human body. It ensures the safety of human life and property. Bismuth tungstate Bi2WO6) is the most active semiconductor material for visible light catalysis at present. Both the material itself and the raw material are safe and non-toxic, and the preparation method is safe and effective. In this paper, the preparation of visible light catalyst Bi_2WO_6 and its complex Bi_2WO_6/ graphene oxide, Bi2WO6 / nitrogen-doped graphene (NGN), and the degradation effect of four simulated dye wastewater under simulated sunlight with xenon lamp were studied. And dedicated to the protection of human health and ecological balance. The details are as follows: 1. Three-dimensional petal Bi_2WO_6 photocatalyst was prepared by hydrothermal method using Na_2WO_4 2H_2O and Bi(NO_3)_3 5H_2O as raw materials. The optimum preparation conditions were optimized. The structure and morphology of the product were characterized by means of Na_2WO_4 2H_2O and Bi(NO_3)_3 5H_2O. The experimental results show that the Bi_2WO_6 prepared at pH=1160 鈩，

本文編號：1850136