本文選題：熒光碳點(diǎn) + 制備��； 參考：《遼寧大學(xué)》2015年碩士論文

【摘要】：目前,有關(guān)熒光碳點(diǎn)(C-dots)制備和應(yīng)用研究受到越來越多科學(xué)人員的關(guān)注。主要原因是:1)分子量、粒徑尺寸都很小,毒性也較低,具有較強(qiáng)的穿透能力,易于實(shí)現(xiàn)細(xì)胞內(nèi)標(biāo)記和成像。2)熒光性能穩(wěn)定,經(jīng)過紫外燈多次激發(fā)數(shù)小時(shí),其光致發(fā)光強(qiáng)度幾乎不變。3)在光源激發(fā)下是優(yōu)良的電子供體和受體,表現(xiàn)出光誘導(dǎo)電子轉(zhuǎn)移的性質(zhì)。本研究采用簡(jiǎn)單方便的一步水熱法,成功地制備出發(fā)藍(lán)、綠兩種顏色的熒光碳點(diǎn),同時(shí)又分別探究了它們?cè)诠獯呋到庥袡C(jī)染料方面的特性,為光催化劑的設(shè)計(jì)與催化機(jī)理研究提供了新的選擇和思路。主要研究內(nèi)容、結(jié)果和結(jié)論如下:1、以葡萄糖為碳源和L-半胱氨酸作為修飾劑,采用水熱法一步合成出發(fā)射藍(lán)色熒光的C-dots。利用XRD、TEM、熒光光譜、紫外吸收光譜和紅外光譜等技術(shù)對(duì)所得到的C-dots的形貌結(jié)構(gòu)、光學(xué)性質(zhì)和表面基團(tuán)等進(jìn)行了表征。研究中,優(yōu)化了反應(yīng)時(shí)間、反應(yīng)溫度和L-半胱氨酸用量等實(shí)驗(yàn)條件,并探討了p H值、鈉離子、Cu2+對(duì)C-dots的光致發(fā)光性能影響。結(jié)果表明:該方法合成的C-dots含有碳的無定形態(tài)結(jié)構(gòu)的特征峰;其粒徑在12.5nm左右;羥基和羧基等含氧基團(tuán)被引入到C-dots表面,增強(qiáng)了其水溶性;該納米粒子表現(xiàn)出激發(fā)波長依賴的發(fā)光性能,其量子產(chǎn)率為5.2%;另外其有較好的光穩(wěn)定性。在較高濃度的Na Cl存在下,其熒光強(qiáng)度變動(dòng)不大,即具有較強(qiáng)的耐鹽性,但在一定的Cu2+共存下,C-dots的熒光強(qiáng)度明顯降低。以C-dots作為光催化劑,研究其在模擬可見光照下對(duì)甲基綠的光催化降解性能�？疾炝斯庹諘r(shí)間、甲基綠初始濃度、催化劑用量等因素對(duì)光催化降解的影響。實(shí)驗(yàn)表明:在過氧化氫存在下,C-dots對(duì)甲基綠具有良好的光催化降解性能。當(dāng)甲基綠初始濃度為40mg/L,碳納米粒子用量為2ml時(shí),3小時(shí)內(nèi)甲基綠的降解率達(dá)到90%以上。2、采用溶劑熱法,以抗壞血酸和甘氨酸為碳源,在無水乙醇和磷酸介質(zhì)中,一步合成發(fā)射綠色熒光的C-dots。利用XRD、TEM、熒光光譜、紫外吸收光譜和紅外光譜技術(shù)等對(duì)所得到的C-dots的形貌結(jié)構(gòu)、光學(xué)性質(zhì)和表面基團(tuán)等進(jìn)行了表征。研究中,對(duì)反應(yīng)溫度、實(shí)驗(yàn)時(shí)間、甘氨酸用量等實(shí)驗(yàn)條件進(jìn)行了優(yōu)化,并探討了p H值、無機(jī)鹽離子、Cu2+對(duì)C-dots光致發(fā)光性能的影響。結(jié)果表明:該方法所制備的C-dots具有碳的無定形態(tài)的特征峰;其粒徑在9.8nm左右;含氧的羥基和羧基等被引入到C-dots表面,增強(qiáng)了其水溶性;該納米粒子也表現(xiàn)出在不同激發(fā)光條件下,其發(fā)射峰位不變,熒光強(qiáng)度有所改變的性質(zhì),其量子產(chǎn)率為8.3%,并表現(xiàn)較好的光穩(wěn)定性;在較高濃度的Na Cl存在下,其熒光強(qiáng)度變化不大,即具有較強(qiáng)的耐鹽性,但在一定的Cu2+共存下,其熒光強(qiáng)度明顯降低。以C-dots作為光催化劑,研究其在模擬太陽光照下對(duì)酸性品紅的光催化降解性能。實(shí)驗(yàn)探討了光照、降解物初始濃度、催化劑用量等因素對(duì)光催化降解酸性品紅的影響。實(shí)驗(yàn)結(jié)果表明:在過氧化氫存在下,C-dots對(duì)酸性品紅具有良好的光催化降解性能。對(duì)于初始濃度為20mg/L的酸性品紅溶液,1小時(shí)內(nèi)的降解率可達(dá)98%以上。
[Abstract]:At present, more and more scientists have attracted more and more attention on the preparation and application of fluorescent carbon dots (C-dots). The main reasons are: 1) molecular weight, small size of particle size, low toxicity, strong penetration ability, easy realization of intracellular labeling and imaging.2) with stable fluorescence performance, photoluminescence after several hours of ultraviolet lamp excitation. Under the excitation of light source, it is an excellent electron donor and receptor, showing the properties of light induced electron transfer. In this study, a simple and convenient one step hydrothermal method was used to successfully prepare two colors of blue and green fluorescent carbon points. At the same time, the characteristics of their photocatalytic degradation of organic dyes were investigated. The main research content, results and conclusions are as follows: 1, using glucose as the carbon source and L- cysteine as a modifier, the blue fluorescent C-dots. is synthesized by hydrothermal method, and the technology of XRD, TEM, fluorescein, UV absorption and infrared spectroscopy is used. The morphology, optical properties and surface groups of the C-dots were characterized. In the study, the reaction time, reaction temperature and L- cysteine dosage were optimized, and the effects of P H value, sodium ion and Cu2+ on the photoluminescence properties of C-dots were investigated. The results showed that the synthesized C-dots contains amorphous form of carbon. The particle size of the structure is about 12.5nm, and the hydroxyl and carboxyl groups are introduced to the surface of C-dots to enhance their water solubility; the nanoparticles exhibit a luminescent property of excitation wavelength dependence, with a quantum yield of 5.2%, and a better light stability. The fluorescence intensity changes little in the presence of a high concentration of Na Cl, that is, It has strong salt tolerance, but under certain Cu2+ coexistence, the fluorescence intensity of C-dots is obviously reduced. The photocatalytic degradation performance of methyl green under the simulated visible light is studied with C-dots as a photocatalyst. The effects of light time, initial concentration of methyl green and the amount of catalyst on the photocatalytic degradation are investigated. In the presence of hydrogen peroxide, C-dots has a good photocatalytic degradation performance for methyl green. When the initial concentration of methyl green is 40mg/L and the amount of carbon nanoparticles is 2ml, the degradation rate of methyl green within 3 hours is over 90%.2, and a solvent thermal method is used to synthesize ascorbic acid and glycine as carbon source and one step is synthesized in anhydrous ethanol and phosphoric acid medium. The green fluorescence C-dots. uses XRD, TEM, fluorescence spectrum, UV absorption spectrum and infrared spectroscopy to characterize the morphology, optical properties and surface groups of the obtained C-dots. In the study, the reaction temperature, the time of experiment, the dosage of glycine and so on were optimized, and the P H value, the inorganic salt ion, and the Cu2+ were discussed. The effect on the photoluminescence properties of C-dots shows that the C-dots prepared by this method has the characteristic peak of amorphous carbon, and its particle size is about 9.8nm, and the hydroxyl and carboxyl group containing oxygen are introduced to the surface of C-dots, and the water solubility is enhanced, and the nanoparticles also show that the emission peak is constant and the fluorescence intensity is strong under the unexcited luminescence condition. The quantum yield is 8.3%, and the light stability is better. In the presence of high concentration of Na Cl, the fluorescence intensity changes little, that is, it has strong salt tolerance, but the fluorescence intensity is obviously reduced under the coexistence of a certain Cu2+. C-dots is used as a photocatalyst to study the acid products under the simulated sunlight. The effects of light, initial concentration of degrading substances and amount of catalyst on the degradation of acid fuchsin were investigated. The experimental results showed that C-dots had good photocatalytic degradation performance for acid fuchsin in the presence of hydrogen peroxide. For 1 hours, an acid fuchsin solution with initial concentration of 20mg/L was in the presence of hydrogen peroxide. The degradation rate can reach more than 98%.

【學(xué)位授予單位】：遼寧大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ422;TQ127.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 關(guān)柏鷗,張桂蘭,湯國慶,韓關(guān)云;半導(dǎo)體納米材料的光學(xué)性能及研究進(jìn)展[J];光電子·激光;1998年03期

2 王敏;王里奧;張文杰;包亮;楊麗麗;;FeVO_4光催化劑降解甲基橙研究[J];功能材料;2009年02期

3 孔祥蕾;;Application of nanodiamonds in human body fluid analysis by matrix-assisted laser desorption/ionization mass spectrometry[J];Chinese Optics Letters;2008年06期

4 Chengtao Yang;Jinliang Wang;Lirun Mei;Xiaoyu Wang;;Enhanced Photocatalytic Degradation of Rhodamine B by Cu_2O Coated Silicon Nanowire Arrays in Presence of H_2O_2[J];Journal of Materials Science & Technology;2014年11期

5 陳彰旭;鄭炳云;李先學(xué);傅明連;謝署光;鄧超;胡衍華;;模板法制備納米材料研究進(jìn)展[J];化工進(jìn)展;2010年01期

6 李新勇,李樹本;納米半導(dǎo)體研究進(jìn)展[J];化學(xué)進(jìn)展;1996年03期

7 ;One-step synthesis of fluorescent hydroxyls-coated carbon dots with hydrothermal reaction and its application to optical sensing of metal ions[J];Science China(Chemistry);2011年08期

8 容紅賓;;納米科技的應(yīng)用[J];科技信息;2012年11期

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