本文關鍵詞：聲化學及非金屬改性BiOCl光催化劑的制備及其光催化性能研究　出處：《江西理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 聲化學 非金屬 BiOCl 光催化 有機污染物

【摘要】：半導體光催化技術作為一種高效、綠色去除有機污染物的方法,其在環(huán)境保護領域有著廣闊的應用前景。BiOCl是一種高效穩(wěn)定的新型光催化劑,具有材料易得、制備方法簡單、對環(huán)境無污染等諸多優(yōu)點。目前大多數的BiOCl改性集中在貴金屬沉積和構筑金屬半導體異質結等方法上,相對來說,聲化學及非金屬改性BiOCl光催化劑的研究鮮有報道。本文以提高BiOCl光催化活性為目標,首先系統(tǒng)研究了不同乙二醇濃度和不同超聲時間對BiOCl結構和光催化性能的影響。然后在最佳乙二醇濃度的基礎上,進一步研究了非金屬單質摻雜及非金屬化合物復合對BiOCl的結構和光催化性能的影響。主要研究內容如下:1.采用聲化學輔助溶劑熱法合成了系列BiOCl納米片光催化劑。考察了不同乙二醇(EG)濃度和超聲時間對BiOCl光催化性能的影響。研究結果表明,適當的超聲時間和EG/H_2O體積比有利于催化劑比表面積的提高,同時可以豐富催化劑表面羥基(-OH)的數量和提高光生電子和空穴的分離效率。當超聲時間為60 min,乙二醇和水(EG/H_2O)體積比為1/4時,合成的BiOCl表現出最佳的光催化活性。2.采用簡單的溶劑熱法制備了非金屬元素(F/B)摻雜BiOCl納米片光催化劑。表征分析結果表明,非金屬元素(F/B)摻雜能增大催化劑的比表面積、細化顆粒尺寸、減少光生電子和空穴的復合和提高載流子的利用率�？疾炝私到舛喾N有機污染物的光催化性能測試。實驗結果表明,非金屬元素(F/B)摻雜能有效提高BiOCl的光催化性能。3.采用簡單的溶劑法制備了SiO_2/BiOCl納米片光催化劑,實驗結果表明,當SiO_2的復合量為1.88%時,SiO_2/BiOCl表現出最佳的光催化降解活性。SiO_2的存在不僅能改善催化劑的表面性能和增大催化劑的比表面積,而且SiO_2表面的缺陷位點是很好的電子陷阱,能加快電子和空穴的分離效率,提高催化劑的光催化活性。循環(huán)降解實驗表明,SiO_2/BiOCl復合光催化劑具有很好的穩(wěn)定性。4.在SiO_2改性BiOCl光催化劑的基礎上,進一步探究了C@SiO_2復合對BiOCl形貌和光催化性能的影響。結果表明,C@SiO_2復合能進一步提高BiOCl的光催化活性。以上研究表明,聲化學及非金屬修飾BiOCl可以改善催化劑表面性能、調控晶面結構和加快光生電子和空穴分離效率,從而有效提高了BiOCl光催化劑對有機污染物的光催化降解性能。
[Abstract]:Semiconductor photocatalytic technology is a highly efficient and green method to remove organic pollutants. BiOCl is a new photocatalyst with high efficiency and stability in the field of environmental protection. At present, most of the modification of BiOCl is focused on the methods of precious metal deposition and the construction of metal semiconductor heterojunction, relatively speaking. There are few reports on sonochemistry and nonmetallic modified BiOCl photocatalysts. The aim of this paper is to improve the photocatalytic activity of BiOCl. The effects of different concentration of ethylene glycol and different ultrasonic time on the structure and photocatalytic performance of BiOCl were studied systematically, and then on the basis of the optimal concentration of ethylene glycol. The effects of nonmetallic doping and nonmetallic compound on the structure and photocatalytic properties of BiOCl were further investigated. The main contents are as follows:. 1. A series of BiOCl nanocrystalline photocatalysts were synthesized by sonochemical assisted solvothermal method. The effects of EGG concentration and ultrasonic time on the photocatalytic performance of BiOCl were studied. Proper ultrasonic time and EG/H_2O volume ratio can improve the specific surface area of the catalyst. At the same time, it can enrich the amount of hydroxyl group on the catalyst surface and improve the separation efficiency of photogenerated electrons and holes, when the ultrasonic time is 60 min. When the volume ratio of ethylene glycol to water EGP / H _ 2O is 1/4. The synthesized BiOCl showed the best photocatalytic activity. 2. The nonmetallic element F / B doped BiOCl photocatalyst was prepared by a simple solvothermal method. The doping of nonmetallic elements F / B can increase the specific surface area of the catalyst and refine the particle size. The photocatalytic properties of photocatalytic degradation of various organic pollutants were investigated by reducing the combination of photogenerated electrons and holes and increasing the efficiency of carriers. The photocatalytic activity of BiOCl can be improved effectively by doping the nonmetallic element (F / B). 3. The photocatalyst of SiO_2/BiOCl nanocrystalline was prepared by simple solvent method. The experimental results show that the photocatalytic activity of SiO_2/BiOCl nanoparticles can be improved by F- / B doping. 3. When the compound of SiO_2 is 1.88. SiO_2/BiOCl showed that the existence of the best photocatalytic degradation activity. SiO2 can not only improve the surface performance of the catalyst and increase the specific surface area of the catalyst. Moreover, the defect sites on the surface of SiO_2 are good electron traps, which can accelerate the separation efficiency of electron and hole and improve the photocatalytic activity of the catalyst. SiO_2/BiOCl composite photocatalyst has good stability. 4. On the basis of SiO_2 modified BiOCl photocatalyst. The effects of C@ SiO-2 composite on the morphology and photocatalytic properties of BiOCl were further investigated. The photocatalytic activity of BiOCl can be further improved by CSOO _ 2 / C _ 2O _ 2 compounding. The results show that sonochemistry and nonmetallic modification of BiOCl can improve the surface performance of the catalyst. The photocatalytic degradation of organic pollutants by BiOCl photocatalyst was improved by regulating the crystal structure and accelerating the efficiency of photoelectron and hole separation.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X505;O643.36

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