本文選題：貴金屬　切入點：納米復合材料　出處：《浙江理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著納米技術的不斷發(fā)展,結構單一性質單一的納米材料已經不能滿足科學進步的發(fā)展,所以發(fā)展更加優(yōu)異性能的納米復合材料顯得尤為重要。納米復合材料不僅保持了原有納米材料的良好性能,而且還具有了一些新的物理和化學性質。貴金屬,其本身作為一種催化劑,改變化學的反應速率但本身不參加最終產物的一種物質。在化工、生物催化以及環(huán)境治理方面都有著潛在的應用價值.同時近年來一種新型的可見光光催化劑Ag@AgX表面等離子體新型光催化劑由于貴金屬的吸收可見光這一特性得到了廣泛的研究。然而由于其回收率低下等原因嚴重影響了對貴金屬以及衍生物的進一步研究和探索。由于石墨烯獨特的結構(比表面積高達2675m2/g)和其優(yōu)異導電機械性能,有望成為理想的載體材料其能夠很好的均勻分散各種催化劑活性組分,對貴金屬的改性具有重要的實際價值。因此本論文的主要內容歸納如下:1、Ag@rGO層狀結構納米復合材料由AgNO_3/GO通過簡單的綠色工藝制備,其中葡萄糖用作還原劑,將AgNO_3還原為Ag,GO轉化為rGO。還原氧化石墨烯作為良好的導體可以抑制電荷復合。作為非碳顆粒進入層中,石墨烯的層間距離將增加,導致層間范德華力減弱,從而降低團聚的可能性。同時,由于復合材料的層狀結構以及rGO高比面積大大提高對硝基苯酚的還原活性,其中銀作為還原劑。2、Ag@AgCl/rGO納米復合材料由AgCl@GO通過光還原法合成,其中使用乙二醇作為還原劑,將AgCl部分還原為Ag形成異質結構Ag@AgCl同時將GO還原為rGO。Ag@AgCl與等離子體效應的界面提供了快速轉移光激發(fā)電子的平臺。此外,rGO的成功加載增加電荷傳輸速率并阻止其空穴-電子復合。所得Ag@AgCl/rGO納米復合材料具有增強的光吸收能力和優(yōu)良的光激發(fā)電子-空穴對的分離。Ag@AgCl形貌對光催化活性的影響很少研究,因此本文改變了PVP的濃度和酸堿度以改變形貌,通過降解亞甲基橙(MO)研究了復合材料的光催化性能。結果表明Ag@AgCl/rGO的形態(tài)影響復合材料的光催化性能。
[Abstract]:With the continuous development of nanotechnology, nanomaterials with single structure and single property can not meet the development of scientific progress. So it is particularly important to develop nanocomposites with better properties. Nanocomposites not only maintain the good properties of the original nanomaterials, but also have some new physical and chemical properties. A substance that itself acts as a catalyst to change the reaction rate of a chemical but does not itself participate in the final product. Biocatalysis and environmental treatment have potential applications. In recent years, a new type of visible light catalyst, Ag@AgX surface plasma, has been obtained because of the absorption of visible light from precious metals. However, due to its low recovery rate, the further research and exploration of precious metals and derivatives have been seriously affected. Due to the unique structure of graphene (specific surface area as high as 2675m2 / g) and its excellent electrical and mechanical properties, It is expected to be an ideal carrier material which can distribute the active components of various catalysts well and evenly. Therefore, the main contents of this paper are summarized as follows: 1: 1 Agr go layered nanocomposites prepared by AgNO_3/GO through a simple green process, in which glucose is used as reducing agent. The reduction of AgNO_3 to Aggo into rGO. The reduction of graphene oxide as a good conductor can inhibit the charge recombination. As a non-carbon particle entering the layer, the interlaminar distance of graphene will increase, resulting in the reduction of the interlaminar van der Waals force. At the same time, the reduction activity of p-nitrophenol was greatly improved because of the laminated structure of the composite and the high specific area of rGO, in which silver was used as reductant, and silver was used as reductant to synthesize AgCl / rGO nanocomposites from AgCl@GO by photoreduction. In which ethylene glycol is used as reducing agent, The partial reduction of AgCl to Ag to form a heterostructure Ag@AgCl and the reduction of go to the interface of rGO.Ag@AgCl and plasma effect provide a platform for the rapid transfer photoexcitation of electrons. In addition, the successful loading of AgCl increases the charge transfer rate and prevents its empty. The effect of the morphology of Ag@AgCl/rGO nanocomposites on the photocatalytic activity was seldom studied, and the excellent separation of photoexcited electron-hole pairs and the morphology of Ag@ AgCl nanocomposites had little effect on the photocatalytic activity. Therefore, the concentration and pH of PVP were changed to change the morphology of the composite. The photocatalytic properties of the composites were studied by degradation of methylene orange. The results showed that the morphology of Ag@AgCl/rGO affected the photocatalytic properties of the composites.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36

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本文編號：1638365