發(fā)布時間：2018-01-22 06:24

  本文關鍵詞： Zn基 納米復合物 固相法 水熱法 溶劑熱法 光催化性能　出處：《淮北師范大學》2016年碩士論文　論文類型：學位論文

【摘要】：光催化技術是一種新型的廢水處理和空氣凈化技術,其具備綠色環(huán)保、穩(wěn)定、高效等優(yōu)點,在環(huán)境污染治理方面有良好的應用前景。鋅基半導體是一種重要的光催化材料,然而有關鋅基光催化劑的制備方法及其在實際應用方面還存在許多問題,例如制備過程繁瑣復雜,實際應用中存在光催化效率低,光催化劑分離回收困難,其循環(huán)利用效率和光催化效率低等問題,有待于進一步改進和優(yōu)化。本論文是在前人研究的基礎上,對現有的部分鋅基光催化劑的制備方面進行了優(yōu)化和改進,同時,通過負載等方法對其改性,方便了光催化劑的分離回收及其循環(huán)利用。主要研究內容和結果如下:1、以Na2WO4·2H2O和Zn(NO3)2·6H2O為原料,利用機械球磨固相法,制備納米Zn WO4光催化劑。通過X-射線衍射儀(XRD)、透射電子顯微鏡(TEM)對所制得樣品的物相和形貌進行表征,研究制備條件對產物組成和結構的影響,并對其光催化性能進行了初步探討。結果表明,在室溫條件下,不需要添加任何輔助試劑,采用機械球磨固相法成功地制備出Zn WO4納米片。同時,光催化實驗也表明,Zn WO4納米片在紫外光照射下具有較好的光催化性能,3小時后甲基橙的降解率達到91%。2、以Na2WO4·2H2O,Bi(NO3)3·5H2O和Zn(NO3)2·6H2O為原料,采用機械球磨固相法制備出Zn WO4/Bi2WO6復合物。利用XRD、TEM、TEM-mapping對產物的物相組成、形貌進行了表征。探討了球磨反應條件對產物的影響,并選取甲基橙作為目標降解物研究所得產物在可見光下的的光催化性能。結果表明,Zn WO4/Bi2WO6復合物光催化活性明顯優(yōu)于單一的Zn WO4或Bi2WO6。在球磨反應2小時并在350℃煅燒4h所得Zn WO4/Bi2WO6復合物表現出最高的光催化活性,在可見光下光催化反應1.5小時后,甲基橙的降解率達到96%。3、以SnCl4.4H2O、ZnSO4.7H2O和硫脲為原料,采用水熱一鍋法制備了ZnS-SnS2復合光催化劑。利用XRD、TEM對產物的物相組成和形貌進行了表征,并探討了水熱條件對產物的影響。選取甲基橙作為目標降解物研究合成產品的光催化性能。結果表明,合成的Zn S-Sn S2復合物光催化降解效率明顯優(yōu)于單一的Zn S和SnS2,在160℃下反應8 h合成的ZnS-SnS2表現出最高的光催化活性,光照3小時后,甲基橙的降解率達到89%。4、以葡萄糖和Fe3O4為原料制備出Fe3O4@C復合物并以此為載體,采用溶劑熱法,以乙二醇為溶劑,加入Cu Cl2·2H2O,Sn Cl4·4H2O,Zn SO4·7H2O,硫脲,制備出具有磁性的Fe3O4@C@Cu2Zn Sn S4納米光催化劑復合物。利用XRD、TEM對產物的物相組成和形貌進行了表征,探究了不同溶劑用量、反應時間、反應溫度對Fe3O4@C@Cu2Zn Sn S4結構和性能的影響。
[Abstract]:Photocatalytic technology is a new type of wastewater treatment and air purification technology, which has the advantages of green environmental protection, stability, high efficiency and so on. Zinc based semiconductor is an important photocatalytic material. However, there are still many problems in the preparation of zinc-based photocatalyst and its practical application. For example, the preparation process is complicated, the photocatalytic efficiency is low, the separation and recovery of photocatalyst is difficult, the recycling efficiency and photocatalytic efficiency are low. On the basis of previous studies, the preparation of some zinc-based photocatalysts has been optimized and improved. At the same time, it has been modified by loading and other methods. The separation and recovery of photocatalyst and its recycling were facilitated. The main research contents and results were as follows: 1. Na2WO4 路2H2O and Zn(NO3)2 路6H2O were used as raw materials. Nanocrystalline Zn WO4 photocatalysts were prepared by mechanical ball milling solid state method. The phase and morphology of the samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The effect of preparation conditions on the composition and structure of the product was studied and the photocatalytic properties of the product were preliminarily discussed. The results showed that no auxiliary reagent was needed at room temperature. Zn WO4 nanocrystals were successfully prepared by mechanical ball milling solid state method. Meanwhile, the photocatalytic experiments showed that Zn WO4 nanoparticles had better photocatalytic properties under UV irradiation. After 3 hours, the degradation rate of methyl orange reached 91%. The raw materials were Na2WO4 路2H _ 2O, Bigno _ 3H _ 3O _ 3 路5H _ 2O and Zn(NO3)2 路6H _ 2O. Zn WO4/Bi2WO6 complex was prepared by mechanical ball milling solid phase method. The morphology was characterized and the effect of milling reaction conditions on the product was discussed. Methyl orange was selected as the target degradation material to study the photocatalytic properties of the product under visible light. The photocatalytic activity of Zn WO4/Bi2WO6 complex was obviously superior to that of Zn WO4 or Bi 2WO6.The Zn was prepared by ball-milling reaction for 2 hours and calcined at 350 鈩，

本文編號：1453942