本文關(guān)鍵詞： 復(fù)合材料 硫化鎘 碲化鎘 水相合成 多空材料 光催化降解　出處：《廣西大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：論文首先簡要的論證了光催化降解染料廢水的優(yōu)異性,總結(jié)了水處理的一些傳統(tǒng)方法,通過比較,討論了TiO2、CdS、CdTe等半導(dǎo)體光催化劑的優(yōu)缺點(diǎn)。概括論述了光催化降解染料廢水的研究進(jìn)展和現(xiàn)狀,系統(tǒng)的總結(jié)了光催化劑的光催化機(jī)理,導(dǎo)體光催化材料的結(jié)構(gòu),并且進(jìn)一步論述了影響光催化降解過程的因素。總結(jié)了在各個(gè)領(lǐng)域應(yīng)用范圍很廣的CdS和CdTe量子點(diǎn)的制備方法,并且水相合成了CdS和CdTe與沸石(或膨潤土)的復(fù)合物,初步探究了其光催化應(yīng)用條件,初步建立論文研究方案。具體實(shí)驗(yàn)如下：第一、以CdCl2·2.5H2O, SeO2和NaBH4為反應(yīng)物,制備巰基丁二酸穩(wěn)定的CdSe量子點(diǎn)。然后將有機(jī)膨潤土與CdSe量子點(diǎn)溶液混合并充分?jǐn)嚢?制備負(fù)載CdSe量子點(diǎn)的膨潤土發(fā)光材料,用熒光光譜、掃描電鏡和X射線粉末衍射等分析測試手段對所得材料的光譜性能與微觀結(jié)構(gòu)進(jìn)行表征。光譜分析表明,量子點(diǎn)膨潤土復(fù)合材料的發(fā)光顏色與量子點(diǎn)溶液非常一致；X射線光電子能譜分析表明,復(fù)合后的材料中含有Cd和Se兩種元素；此外,量子點(diǎn)膨潤土復(fù)合材料X射線粉末衍射譜中可見CdSe量子點(diǎn)(111), (220)及(331)三個(gè)晶面的衍射峰, 在20=4.3°處出現(xiàn)膨潤土(001)衍射峰。數(shù)據(jù)表明,制備CdSe量子點(diǎn)膨潤土復(fù)合材料,沒有改變量子點(diǎn)和膨潤土的結(jié)構(gòu)；第二,以CdCl2和硫代乙酰胺為反應(yīng)物,通過濕化學(xué)法合成CdS/膨潤土復(fù)合材料,采用X射線衍射(XRD)、紅外光譜(FTIR)以及紫外可見光譜(UV-Vis)等分析技術(shù)對其結(jié)構(gòu)及光學(xué)性能進(jìn)行表征。以羅丹明B和亞甲基藍(lán)為目標(biāo)污染物,考察了CdS/膨潤土復(fù)合材料對有機(jī)染料的降解性能。結(jié)果表明：在羅丹明B和亞甲基藍(lán)的初始濃度為20mg/L時(shí),光照3h后,CdS/膨潤土對它們的降解率分別為80.6%和88.3%,優(yōu)于CdS及膨潤土原土催化劑；第三、以巰基乙酸為穩(wěn)定劑、硫代乙酰胺為硫源合成CdS量子點(diǎn)并將其負(fù)載與沸石中。研究了復(fù)合材料的光學(xué)特性,通過XRD. UV-Vis.分子熒光對其進(jìn)行了表征。以氙燈為光源,降解甲基橙、結(jié)晶紫和茜素紅三種染料以探究復(fù)合材料的光催化性能。結(jié)果表明,經(jīng)過一定時(shí)間的光照反映后,復(fù)合材料對三種染料的降解率為結(jié)晶紫93.62%、茜素紅80.95%、甲基橙86.36%；第四、以CdCl2和Na2TeO3為反應(yīng)物,抗壞血酸為還原劑,通過濕化學(xué)法合成CdTe量子點(diǎn)/膨潤土復(fù)合材料。采用X射線衍射、熒光光譜及紫外可見光譜等分析技術(shù)對其結(jié)構(gòu)及光學(xué)性能進(jìn)行表征。以汞燈為光源,甲基橙為目標(biāo)污染物,研究了CdTe/膨潤土復(fù)合材料的光催化活性。實(shí)驗(yàn)表明：在甲基橙溶液初始濃度為1 Omg/L時(shí),經(jīng)汞燈光照反應(yīng)60min后,CdTe/膨潤土因光催化反應(yīng)對甲基橙的降解率為66.23%,優(yōu)于CdTe量子點(diǎn)光催化劑。
[Abstract]:Firstly, the paper briefly demonstrates the excellence of photocatalytic degradation of dye wastewater, summarizes some traditional methods of water treatment, and compares them with each other. The advantages and disadvantages of semiconductor photocatalysts such as TIO _ 2O _ 2 ~ (2 +) CdS- CdTe are discussed. The research progress and present situation of photocatalytic degradation of dye wastewater are summarized. The photocatalytic mechanism of photocatalyst and the structure of conducting photocatalytic materials are systematically summarized. The preparation methods of CdS and CdTe quantum dots, which are widely used in various fields, were summarized, and the complexes of CdS and CdTe with zeolite (or bentonite) were synthesized in aqueous phase. The application conditions of photocatalysis were preliminarily explored, and the research scheme was established. The experiments were as follows: firstly, CdCl2 路2.5H _ 2O, SeO2 and NaBH4 were used as reactants. The stable CdSe quantum dots with mercaptosuccinic acid were prepared, and then the organic bentonite and CdSe quantum dots were mixed and stirred sufficiently to prepare the bentonite luminescent materials loaded with CdSe quantum dots. The spectroscopic properties and microstructure of the obtained materials were characterized by SEM and X-ray powder diffraction. The luminescence color of the bentonite composite is very consistent with that of quantum dot solution. The X-ray photoelectron spectroscopy analysis shows that the composite material contains two elements, CD and se. In the X-ray powder diffraction spectrum of quantum dot bentonite composites, the diffraction peaks of CdSe quantum dots 111U, 220and 331are observed, and the diffraction peaks of bentonite are observed at 204.3 擄. The data show that the CdSe quantum dot bentonite composites have been prepared. The structure of quantum dots and bentonite was not changed. Secondly, CDs / bentonite composites were synthesized by wet chemical method using CdCl2 and thioacetamide as reactants. The structure and optical properties of Rhodamine B and methylene blue were characterized by X-ray diffraction, FTIR and UV-Vis. etc. The degradation of organic dyes by CDs / bentonite composites was investigated. The results showed that the initial concentration of Rhodamine B and methylene blue was 20 mg / L, The degradation rates of CDS / bentonite were 80.6% and 88.3 respectively after 3 h irradiation, which were superior to those of CdS and bentonite catalysts. Third, thioglycolic acid was used as stabilizer, and thioglycolic acid was used as stabilizer. CdS quantum dots were synthesized by thioacetamide as sulfur source and loaded into zeolites. The optical properties of the composites were studied and characterized by XRD. UV-Vis.Molecular fluorescence. Using xenon lamp as light source, methyl orange was degraded. Crystal violet and alizarin red dyes were used to study the photocatalytic properties of the composite. The results showed that the degradation rates of the composite were 93.622% crystal violet, 80.95% alizarin red, 86.36 methyl orange, 4th, 4th, respectively, after a certain period of light reaction, the degradation rates of the three dyes were as follows: Crystal violet 93.62 2, alizarin red 80.95, methyl orange 86.36; CdTe quantum dots / bentonite composites were synthesized by wet chemical method using CdCl2 and Na2TeO3 as reactants and ascorbic acid as reducing agent. The structure and optical properties were characterized by fluorescence spectra and UV-Vis spectra. The mercury lamp was used as the light source and methyl orange as the target pollutant. The photocatalytic activity of CdTe / bentonite composite was studied. The experimental results show that when the initial concentration of methyl orange solution is 1 Omg/L, The degradation rate of methyl orange by photocatalytic reaction of CdTe / bentonite was 66.23%, which was superior to that of CdTe quantum dot photocatalyst.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703;O643.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙慧凱;楊昆;秦澤華;王益林;;CdS/膨潤土復(fù)合材料的制備及其光催化性能[J];發(fā)光學(xué)報(bào);2015年01期

2 楊悅;趙翠真;于晨光;黃梟;呂威;;Pt/TiO_2復(fù)合納米結(jié)構(gòu)形貌控制及光催化動力學(xué)[J];發(fā)光學(xué)報(bào);2014年12期

3 曹萍;白越;;N摻雜納米ZnO的制備及光催化性能[J];發(fā)光學(xué)報(bào);2013年10期

4 李冬冬;佘江波;王麗莉;彭波;;二氧化鈦負(fù)載光纖型光催化反應(yīng)器的研究進(jìn)展[J];中國光學(xué);2013年04期

5 周華健;曹立新;高榮杰;蘇革;柳偉;趙艷玲;王磊;;水溶性CdTe量子點(diǎn)熒光探針的制備表征及應(yīng)用[J];發(fā)光學(xué)報(bào);2013年07期

6 莫冰;黃榮海;趙峰;凌朝東;;微生物燃料電池的電能采集系統(tǒng)[J];光學(xué)精密工程;2013年07期

7 卿勝蘭;辜敏;甘平;;三階光學(xué)非線性CdS-SiO_2復(fù)合薄膜的電化學(xué)溶膠-凝膠制備及表征[J];硅酸鹽學(xué)報(bào);2013年03期

8 王益林;楊昆;潘華橋;劉聲燕;許獻(xiàn)美;周立亞;;高質(zhì)量CdSe量子點(diǎn)的水相制備與表征[J];高等學(xué)�；瘜W(xué)學(xué)報(bào);2012年12期

9 段淑娥;翟云會;屈穎娟;馬明陽;;銀-組氨酸配合物-蒙脫石抗菌劑的制備及抗菌活性[J];高等學(xué)校化學(xué)學(xué)報(bào);2012年12期

10 張德龍;李萬萬;王解兵;孫康;;液體石蠟體系中CdSeS三元量子點(diǎn)的制備及性能[J];高等學(xué)�；瘜W(xué)學(xué)報(bào);2012年07期

，

本文編號：1555197