本文選題：電催化氧化 + 石墨烯　； 參考：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文

【摘要】：生育酚是維生素E的重要部分。維生素E,是一種常見的脂溶性維生素,包括生育酚和生育三烯酚。常見的有α-,β-,γ-,δ-生育酚,α-,β-,γ-,δ-生育三烯酚這八種形式,由于維生素E結(jié)構(gòu)復(fù)雜,異構(gòu)體種類繁多,在檢測(cè)上人們一直在尋找更準(zhǔn)確便捷的方式。αα-生育酚是維生素E中含量最高活性最強(qiáng)的部分,通常通過檢測(cè)α-生育酚來測(cè)定維生素E。作為人類文明重要的推動(dòng)者,材料是永恒的瑰寶,在研究者的眼中,輝煌如初。時(shí)至今日,常規(guī)的材料已然難以滿足人們?nèi)找嬖鲩L的需求,常規(guī)材料是豐富的無處不在又價(jià)格低廉,然而功能的單一決定了它們無法提供多元化的應(yīng)用。智能和信息應(yīng)用的發(fā)展決定了材料也要逐步向新方向轉(zhuǎn)化,各種先進(jìn)的材料不斷的被發(fā)現(xiàn),材料的多元化亦是一個(gè)新的時(shí)代。石墨烯是一種僅具有原子厚度的二維材料,它展現(xiàn)了很好的導(dǎo)電性,導(dǎo)熱性,柔韌性。在多個(gè)領(lǐng)域,都展現(xiàn)出很大的潛力,近年的研究中凸顯出各種優(yōu)異的特性,而其表面官能化的潛力又帶來了一個(gè)龐大的石墨烯家族,這些石墨烯的衍生物,也被發(fā)現(xiàn)了更進(jìn)一步的優(yōu)越性。本文的工作主要包括兩個(gè)部分:1.通過在裸玻碳電極表面電鍍摻雜的羧基化石墨烯制備得到石墨烯/玻碳電極用以檢測(cè)αα-生育酚。相比于現(xiàn)有報(bào)道方法的繁復(fù),我們的修飾電極無疑是一支造價(jià)低廉且制備簡便的電極,檢測(cè)方式也簡單地采用了差分脈沖伏安法(DPV),首先進(jìn)行富集,之后采用DPV進(jìn)行檢測(cè),得到的響應(yīng)電流與待測(cè)物有線性關(guān)系。采用的反應(yīng)底液是一定比例的乙醇和水混合溶液,因?yàn)樯邮且环N脂溶性物質(zhì),對(duì)于這樣的物質(zhì)在有機(jī)相中有更好的溶解性,然而電化學(xué)方法對(duì)于水相中的反應(yīng)有更佳的響應(yīng),因此選用有機(jī)相和水相的混合液可以同時(shí)達(dá)到增加溶解性和響應(yīng)信號(hào)的目的。2.我們還采用了另一種基底電極電鍍碳納米管。在第二個(gè)工作中,基底電極選擇為銀電極,首先將銀電極在氫氧化鈉溶液中極化,使其露出表面新鮮的金屬銀,并且產(chǎn)生納米氧化銀顆粒,之后再電鍍石墨烯。這一方面是利用了金屬銀的催化性,另一方面石墨烯本身也具有催化性,而且電鍍至電極表面的石墨烯根據(jù)電鏡圖像也能明顯發(fā)現(xiàn)增大了電極表面積,這些都有利于響應(yīng)電流的增加。檢測(cè)方法采用了我們組在2014年提出的陽極掃描極化反向催化伏安法(PSPRCV),這種方法是采用循環(huán)掃描方式,在陽極掃描過程中使電極極化,反向掃描時(shí)記錄電極上的還原電流。分析物不存在時(shí)的電流作為無催化反應(yīng)的背景電流,然后用分析物存在時(shí)記錄的電流減去背景電流,得到差值伏安圖,即純凈的催化電流-電位曲線。差值電流峰為正負(fù)峰形,差值峰電流與分析物濃度具有線性關(guān)系,據(jù)此進(jìn)行定量分析。這種方法可以很好的避免背景電流的干擾。
[Abstract]:Tocopherol is an important part of vitamin E. Vitamin E, a common fat-soluble vitamin, includes tocopherol and fertility trienol. There are eight common forms of 偽 -, 尾 -, 緯 -, 未 -tocopherol, 偽 -, 尾 -, 緯 -, 未 -fertility trienol. People have been looking for a more accurate and convenient way of testing. 偽-偽-tocopherol is the most active part of vitamin E. it is usually determined by detecting 偽-tocopherol. As an important promoter of human civilization, material is eternal treasure, in the eyes of researchers, brilliant as ever. Nowadays, it is difficult to meet the increasing demand of conventional materials. Conventional materials are abundant, ubiquitous and cheap. However, because of the single function, they can not provide a variety of applications. The development of intelligence and information applications determines that materials should be gradually transformed to a new direction. All kinds of advanced materials are constantly found, and the diversity of materials is also a new era. Graphene is a two-dimensional material with only atomic thickness. It shows good conductivity, thermal conductivity and flexibility. In many fields, there is great potential. In recent years, various excellent properties have been highlighted, and the potential of surface functionalization has brought about a large family of graphene, derivatives of graphene. Further advantages have also been found. The work of this paper mainly includes two parts: 1. Graphene / glassy carbon electrode was prepared by electroplating carboxylated graphene on the surface of bare glassy carbon electrode to detect 偽 -tocopherol. Compared with the present reported methods, our modified electrode is undoubtedly a cheap and simple electrode. The method of detection is also simple, which is enriched by differential pulse voltammetry, then detected by DPV. The response current obtained is linearly related to the object to be tested. The reaction substrate is a mixture of ethanol and water, because tocopherol is a lipophilic substance that is more soluble in organic phase. However, the electrochemical method has a better response to the reaction in water phase, so the mixture of organic phase and water phase can achieve the purpose of increasing solubility and response signal at the same time. We also used another substrate electrode to electroplate carbon nanotubes. In the second work, the substrate electrode was selected as the silver electrode. Firstly, the silver electrode was polarized in sodium hydroxide solution to expose the fresh metal silver on the surface, and the nano-silver oxide particles were produced, and then graphene was electroplated. On the one hand, it makes use of the catalysis of metallic silver, on the other hand, graphene itself is also catalytic, and the graphene electroplated to the electrode surface can obviously increase the surface area of the electrode according to the electron microscope image. These are beneficial to increase the response current. In this method, the anodic scanning polarization reverse catalytic voltammetry (PSPRCVN) proposed by our group in 2014 is used. This method uses the cyclic scanning method to polarization the electrode during the anodic scanning and records the reduction current on the electrode during reverse scanning. When the analyte does not exist, the current is used as the background current without catalytic reaction, then the background current is subtracted from the current recorded in the presence of the analyte, and the difference voltammogram is obtained, that is, the pure catalytic current-potential curve. The peak of differential current is positive and negative, and the peak current of difference has a linear relationship with the concentration of analyte, according to which the quantitative analysis is carried out. This method can avoid the interference of background current.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ466.5;O657.1

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