本文關鍵詞：鐵酸鋅基復合光催化劑的制備及其在凈化抗生素廢水中的應用研究　出處：《江蘇大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 抗生素光降解 可見光催化 異質結 鐵酸鹽 反應歷程

【摘要】：近年來,隨著抗生素使用量的迅速增加,造成了大量的抗生素污染的現象,在水污染中表現的尤為突出。在環(huán)境治理技術中,光催化技術由于其高效率,低成本及無污染等特點,具有廣泛的應用前景。目前,研究熱點聚焦在具有可見光響應和磁性可回收性質的光催化劑的制備;而晶石型鐵酸鹽半導體光催化材料以其特有的光、磁、電等性質成為目前最熱門的研究材料之一。本文以磁性尖晶石型鐵酸鹽光催化劑為研究對象,采用水熱法制備磁性鐵酸鋅、鐵酸鈷和鐵酸鋅鈷光催化劑、磁性氯氧鉍/鐵酸鋅復合光催化劑及鈷離子摻雜的鐵酸鋅/石墨相氮化碳復合光催化劑,并對其結構、形貌、磁性劑光催化性能等進行了表征和測試,研究不同復合比例對其結構、形貌及光催化活性的影響;通過其在可見光照射下對不同抗生素的光催化降解能力來說明不同鐵酸鹽含量的光催化劑對光催化性能的影響。主要結論如下:1.采用水熱合成法,在加入不同的酸和不同反應時間的條件下制備了尖晶石型鐵酸鋅、鐵酸鋅鈷、鐵酸鈷可見光響應的光催化劑。研究表明,在不同多元酸種類中和反應陳化時間中最佳優(yōu)化條件是加入酒石酸并且反應時間為48 h時,制備的鐵酸鹽光催化劑純度高、結晶度好、分布均勻。同時,對Zn_xCo_(1-x)Fe_2O_4(x=0-1)復合光催化劑進行了光催化實驗,結果表明,Zn_(0.5)Co_(0.5)Fe_2O_4(x=0.5)的光催化降解螺旋霉素活性最高。2.采用水熱法制備了BiOCl/ZnFe_2O_4復合光催化劑。研究表明,ZnFe_2O_4納米粒子均勻地負載在BiOCl納米圓盤表面,構成了異質結構,有效的抑制了光生電子和空穴的復合,延長載流子壽命,從而提升了光催化活性。光催化降解實驗結果表明,在可見光照射下,10%BiOCl/ZnFe_2O_4復合光催化劑在180 min內對青霉素的降解率高達99%。3.采用沸騰回流的方法制備了g-C_3N_4/Zn_(0.5)Co_(0.5)Fe_2O_4復合光催化劑。研究表明,Zn_(0.5)Co_(0.5)Fe_2O_4納米粒子成功負載在g-C_3N_4二維納米片上,并且在其界面上形成了異質結結構,能有效地抑制復合光催化劑內部光生載流子的復合,從而提高了光催化活性。光催化實驗結果表明,在可見光照射下,g-C_3N_4/Zn_(0.5)Co_(0.5)Fe_2O_4復合光催化劑的光催化性能明顯于高單一的g-C_3N_4和Zn_(0.5)Co_(0.5)Fe_2O_4,在180 min內對氯霉素的降解率達到98.8%。
[Abstract]:In recent years, with the rapid increase in the use of antibiotics, a large amount of antibiotic pollution has been caused, especially in water pollution. In the environment control technology, photocatalytic technology has a wide application prospect because of its high efficiency, low cost and no pollution. At present, the research focus is focused on the preparation of photocatalyst with visible light response and magnetic recoverability, and the crystalline ferrite type semiconductor photocatalytic material has become one of the hottest research materials due to its unique properties of light, magnetism and electricity. In this paper, the magnetic spinel ferrite photocatalyst as the research object, the preparation of magnetic iron zinc, cobalt ferrite and zinc cobalt ferrite magnetic photocatalyst, bismuth oxychloride / zinc ferrite / composite photocatalyst and cobalt doped zinc ferrite graphite carbon nitride composite photocatalyst by hydrothermal method, and the the structure, morphology, magnetic agent photocatalytic properties were characterized and tested, effects of different composite ratio on the structure, morphology and photocatalytic activity; through the under visible light irradiation on the photocatalytic degradation ability of different antibiotics to illustrate the impact of photocatalysts with different ferrite content on Photocatalytic performance. The main conclusions are as follows: 1. by using the method of hydrothermal synthesis, in different acid and different reaction time under the conditions of the preparation of photocatalyst with visible light response of zinc ferrite spinel ferrite, zinc cobalt, cobalt ferrite. Research shows that in different types of acid neutralization reaction aging time is the optimal condition of tartaric acid is added and the reaction time is 48 h, ferrite catalyst for preparation of high purity, good crystallinity, uniform distribution. Meanwhile, photocatalytic activity of Zn_xCo_ (1-x) Fe_2O_4 (x=0-1) composite photocatalyst was investigated. The results showed that the activity of Zn_ (0.5) Co_ (0.5) Fe_2O_4 (x=0.5) photocatalytic degradation spiramycin was the highest. 2. the BiOCl/ZnFe_2O_4 composite photocatalyst was prepared by hydrothermal method. The research shows that ZnFe_2O_4 nanoparticles uniformly load on the surface of BiOCl nano discs, forming heterostructures, effectively suppressing the recombination of photo generated electrons and holes, prolonging carrier life and enhancing photocatalytic activity. The results of photocatalytic degradation show that the degradation rate of 10%BiOCl/ZnFe_2O_4 composite photocatalyst to penicillin in 180 min is up to 99% under visible light irradiation. 3. g-C_3N_4/Zn_ (0.5) Co_ (0.5) Fe_2O_4 composite photocatalyst was prepared by the method of boiling reflux. The results show that Zn_ (0.5) Co_ (0.5) Fe_2O_4 nanoparticles are successfully loaded on g-C_3N_4 two-dimensional nanosheets, and a heterojunction structure is formed at the interface. It can effectively inhibit the recombination of photo generated carriers in the composite photocatalyst, thereby improving the photocatalytic activity. The photocatalytic results showed that under visible light irradiation, the photocatalytic performance of g-C_3N_4/Zn_ (0.5) Co_ (0.5) Fe_2O_4 composite photocatalyst was obviously higher than that of high single g-C_3N_4 and Zn_ (0.5) Co_ (0.5) Fe_2O_4, and the degradation rate of chloramphenicol was 98.8% within 180 min.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703;O643.36

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