本文選題：Bi2WO6 + 納米復(fù)合材料��； 參考：《南京郵電大學(xué)》2015年碩士論文

【摘要】：WO3和Bi2WO6都是n型半導(dǎo)體材料,其中WO3的禁帶寬度為2.4-2.9 eV,Bi2WO6為2.8eV。其中Bi2WO6是由[Bi2O2]2+層和WO6八面體層交替排列構(gòu)成的晶體結(jié)構(gòu),這種層狀結(jié)構(gòu)有利于電荷轉(zhuǎn)移,因此,Bi2WO6能夠顯示出優(yōu)良的光催化降解活性。WO3納米線的比表面積較大,在氣敏傳感、電致和光致發(fā)光、電導(dǎo)電極及光催化等各個方面均具有良好的應(yīng)用前景,這些都是傳統(tǒng)WO3材料無法比擬的。本文所述實驗方法打破了常規(guī)水熱法中對反應(yīng)容器和反應(yīng)條件的嚴(yán)苛要求,具有簡單易操作,能耗低等優(yōu)點。對低溫制備的各種形貌的樣品進(jìn)行表征、光催化實驗及生物應(yīng)用實驗,得到優(yōu)異效果,并對其相關(guān)機(jī)理進(jìn)行了初步探究。具體內(nèi)容如下:(1)采用低溫水熱方法制備Bi2WO6過程中,表面活性劑對Bi2WO6形貌有重要影響。原因是表面活性劑提供的模板導(dǎo)向作用不同,溶劑影響奧斯瓦爾德熟化過程中的傳質(zhì)速率,進(jìn)而影響樣品的晶體結(jié)構(gòu)和最終形貌。與傳統(tǒng)制備方法相比,本文所采用的低溫水熱法制備出的Bi2WO6仍擁有非常優(yōu)異的光催化效果。(2)在95℃低溫條件下,Bi(NO3)3?5H2O與預(yù)先合成的WO3?nH2O經(jīng)水熱處理可生成Bi2WO6。形成的Bi2WO6/WO3異質(zhì)結(jié)在紫外-可見光區(qū)存在強(qiáng)吸收特性,并能顯著提高對甲基橙的光催化降解活性。Bi2WO6/WO3異質(zhì)結(jié)為光催化劑對甲基橙的光降解降效果優(yōu)于單一組分納米材料。這種增強(qiáng)產(chǎn)生的原因是異質(zhì)結(jié)的緊密接觸有利于光生電子傳輸,并促進(jìn)電子-空穴對的分離。(3)采用化學(xué)沉淀和水熱法制備WO3,通過改變各種實驗參數(shù),在低于95℃條件下合成出不同形貌的WO3納米材料。以(NH4)2SO4為表面活性劑可制備出針狀的WO3納米微球。采用一步退火法可以在鎢絲襯底上生長出長徑比高達(dá)400的WO3納米線,WO3納米線在電化學(xué)及生物檢測方面都用重要應(yīng)用。(4)實驗證明不同濃度的納米Ag和同濃度不同形貌的納米WO3都具有一定的抑菌殺菌效果。濃度為0.067 M粒徑約50 nm的納米Ag具有明顯抑菌殺菌效果。不同形貌的WO3抑菌殺菌效果不同,針狀的WO3納米材料具有較明顯的抑菌殺菌效果,推測是WO3納米線在光照射下作為一種半導(dǎo)體材料具有催化性質(zhì),產(chǎn)生了強(qiáng)氧化性的物質(zhì)。
[Abstract]:Both WO3 and Bi2WO6 are type N semiconductor materials, in which the band gap of WO3 is 2.4-2.9 eV, Bi2WO6 is 2.8eV. and Bi2WO6 is a crystal structure composed of [Bi2O2]2+ layer and WO6 eight surface layer, which is beneficial to the charge transfer. Therefore, Bi2WO6 can show the specific surface area of the excellent photocatalytic degradation activity nanowires. It has a good application prospect in various aspects such as gas sensing, electroluminescence, photoluminescence, conductance electrode and photocatalysis, which are all unparalleled by traditional WO3 materials. The experimental method described in this paper has broken the strict requirements for the reaction vessel and reaction conditions in the conventional hydrothermal method, and has the advantages of simple and easy operation and low energy consumption. The samples of various morphologies prepared at low temperature have been characterized, photocatalytic experiments and biological application experiments have obtained excellent results, and their related mechanisms are preliminarily explored. The specific contents are as follows: (1) the surface active agent has an important influence on the morphology of Bi2WO6 during the preparation of Bi2WO6 by the low temperature hydrothermal method. The reason is the mold provided by the surfactant. The effect of plate guidance on the mass transfer rate in the process of Oswald ripening affects the crystal structure and final morphology of the sample. Compared with the traditional preparation method, the low temperature hydrothermal method used in this paper still has excellent photocatalytic effect. (2) Bi (NO3) 3? 5H2O and advance at low temperature at 95. The synthesized WO3? NH2O can produce the Bi2WO6/WO3 heterojunction formed by Bi2WO6. in the ultraviolet visible light region, and it can significantly improve the photocatalytic degradation of the methyl orange activity.Bi2WO6/WO3 heterojunction, which is better than the single component nanomaterial. The close contact of the heterojunction is beneficial to the photoinduced electron transport and the separation of the electron hole pair. (3) WO3 was prepared by chemical precipitation and hydrothermal method. By changing various experimental parameters, WO3 nanomaterials with different morphologies were synthesized under the conditions of lower than 95 degrees. The needle like WO3 nanospheres could be prepared by (NH4) 2SO4 as a surface active agent. The WO3 nanowires with a length to diameter ratio of 400 can be grown on the tungsten wire substrate by one step annealing. The WO3 nanowires have important applications in electrochemical and biological detection. (4) the experiments show that the nano Ag with different concentrations and the nano WO3 with different morphologies with the same concentration have a certain bactericidal effect. The concentration of 0.067 M particle size is about 50 nm. Ag has obvious bacteriostasis and bactericidal effect. Different morphologies of WO3 have different bacteriostasis and bactericidal effect. The needle like WO3 nanomaterials have obvious bacteriostasis effect. It is speculated that WO3 nanowires have catalytic properties as a kind of semiconductor materials under light irradiation, and produce strong oxidation properties.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN304;TB383.1

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