本文選題：選擇性氧化 + 芳香醇��； 參考：《淮北師范大學(xué)》2017年碩士論文

【摘要】：通過不同方法制備了一系列不同形貌的In_2S_3光催化劑,考察了不同合成方法對In_2S_3形貌的影響,并研究其在可見光下選擇性氧化有機(jī)物的光催化活性。通過簡單的氨基酸分子輔助合成的方法合成了系列花狀I(lǐng)n_2S_3,比較分析了催化劑本體形貌以及氨基酸做為輔助試劑對其光催化活性的影響。分別采用XRD、UV-vis DRS、SEM、TEM、BET、XPS、ESR等表征技術(shù)對上述樣品進(jìn)行表征分析。結(jié)果表明,不同氨基酸為結(jié)晶助劑得到了不同形貌In_2S_3。在可見光下選擇性氧化芳香醇到芳香醛的光催化活性結(jié)果表明,甘氨酸做為修飾劑合成的In_2S_3相較于不加氨基酸合成的樣品具有較大的比較面積和較高的光生電子-空穴對的分離效率,In_2S_3選擇性氧化醇到醛在加入氨基酸做結(jié)晶助劑后較不加時(shí)轉(zhuǎn)化率有所提高,且具有較高的選擇性。這種通過加入具有合適功能基團(tuán)(如-NH2和-COOH)的氨基酸來改變材料性能的方法為實(shí)現(xiàn)合成有序納米材料提供了一種廉價(jià),綠色,有拓展性的方法。在對In_2S_3的其他合成條件的探索中發(fā)現(xiàn),不同硫源對In_2S_3的生長有不同的影響,加入L-Cysteine后得到的樣品結(jié)晶性較差,TU和TAA條件下合成的樣品活性稍有提升。增加硫離子濃度對于In_2S_3的合成也有非常大的影響,探究合適的In/S比對于硫化銦的合成有至關(guān)重要的作用。我們采用化學(xué)還原法制備了Pt/RGO催化劑,采用乙二醇做溶劑和還原劑,通過溶劑熱的方法在還原GO的同時(shí)也還原了Pt粒子,使其均勻地分散在RGO表面,且這種合成方法得到的Pt粒子粒徑相對均勻。在將其用于肉桂醛選擇加氫反應(yīng)中發(fā)現(xiàn),通過金屬Pt修飾劑修飾后的催化劑的具有較高的轉(zhuǎn)化率,這可能是由于Pt粒子的加入后使C=O鍵得到了弱化。這一反應(yīng)在光催化領(lǐng)域中還鮮有報(bào)道,更多的實(shí)驗(yàn)條件和反應(yīng)機(jī)理還有待于進(jìn)一步的研究。
[Abstract]:A series of In_2S_3 photocatalysts with different morphologies were prepared by different methods. The effects of different synthesis methods on the morphology of In_2S_3 were investigated, and the photocatalytic activity of In_2S_3 photocatalysts for selective oxidation of organic compounds under visible light was studied.A series of flower Ins _ 2s _ 3 were synthesized by a simple method of amino acid molecular assisted synthesis. The effects of catalyst bulk morphology and amino acid as auxiliary reagent on its photocatalytic activity were compared and analyzed.The samples were characterized by means of XRDX UV-vis UV-vis DRSX SEMSTM Tem BETX XPS ESR and so on.The results showed that different morphologies of in _ 2s _ s _ s _ s _ 3s _ 3 were obtained by using different amino acids as crystal auxiliaries.The photocatalytic activity of selective oxidation of aromatic alcohols to aromatic aldehydes under visible light shows that,The In_2S_3 synthesized by glycine as modifier has a larger comparative area and higher separation efficiency of photogenerated electron-hole pairs than the sample synthesized without amino acids. In _ 2S _ 3 selective oxidation of alcohols to aldehydes helps to crystallize in addition of amino acids.The conversion rate was increased after the addition of the agent.And it has high selectivity.This method by adding amino acids with suitable functional groups (such as -NH _ 2 and -COOH) to change the properties of the materials provides a cheap, green and extensible method for the synthesis of ordered nanomaterials.In the exploration of other synthetic conditions of In_2S_3, it was found that different sulfur sources had different effects on the growth of In_2S_3, and the activity of the samples synthesized under the conditions of TU and TAA was slightly improved after the addition of L-Cysteine.Increasing the concentration of sulfur ion also has a great influence on the synthesis of In_2S_3. It is very important to explore the appropriate In/S ratio for the synthesis of indium sulfide.The Pt/RGO catalyst was prepared by chemical reduction method. Ethylene glycol was used as solvent and reductant. The Pt particles were reduced by solvothermal method, and the Pt particles were dispersed uniformly on the surface of RGO.The particle size of Pt particles obtained by this synthesis method is relatively uniform.In the selective hydrogenation of cinnamaldehyde, it was found that the catalyst modified by Pt had a higher conversion, which may be due to the weakening of the C-O bond after the addition of Pt particles.This reaction is rarely reported in the field of photocatalysis, and more experimental conditions and reaction mechanisms need to be further studied.
【學(xué)位授予單位】：淮北師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O621.251

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本文編號：1733406