本文選題：溶劑熱 + 二硫化鉬　； 參考：《鄭州大學(xué)》2015年碩士論文

【摘要】：近年來,太陽能光催化分解水制氫憑借其低成本、高活性以及清潔無污染等優(yōu)點(diǎn),倍受人們的關(guān)注。然而,要實(shí)現(xiàn)太陽能光解水制氫的實(shí)用化,首先需要解決兩大重要問題:一是制備高效、穩(wěn)定、低成本的可見光活性催化劑,二是構(gòu)建高效、穩(wěn)定的光催化產(chǎn)氫體系。具有二維層狀結(jié)構(gòu)的二硫化鉬為人們提高光催化產(chǎn)氫性能提供了新途徑。為此,本論文制備了具有高活性的二硫化鉬及其納米復(fù)合材料,并對其光催化分解水產(chǎn)氫性能進(jìn)行了研究。(1)以Na2Mo O4·2H2O為鉬源,KSCN為硫源和還原劑,DMF為反應(yīng)溶劑,通過調(diào)節(jié)反應(yīng)溫度、時間等實(shí)驗條件,采用溶劑熱法成功制備了具有高產(chǎn)氫活性的二硫化鉬,并對其微觀結(jié)構(gòu)、形貌、組成進(jìn)行了表征;在此基礎(chǔ)上,考察和優(yōu)化了催化劑在可見光下(λ420nm)的光催化產(chǎn)氫性能。以曙紅Y(EY2-)作為光敏劑,三乙醇胺(TEOA)為犧牲劑,在最佳產(chǎn)氫條件下,其析氫速率達(dá)到了876μmol·h-1,且經(jīng)過四次循環(huán)后,產(chǎn)氫活性基本穩(wěn)定。(2)采用回流法合成了4-MBA@Mo S2復(fù)合物,并對該復(fù)合物進(jìn)行了表征。結(jié)果表明:該復(fù)合物不僅增強(qiáng)了Mo S2在可見區(qū)的吸收能力,且當(dāng)4-MBA的包覆量為1.5wt%時,最高析氫速率達(dá)到1849.6μmol·h-1,約是相同條件下未被修飾的Mo S2活性的2.1倍(876μmol·h-1)。(3)采用溶劑熱法一步合成了MoS2/Ti O2納米復(fù)合物并對其形貌、組成、結(jié)構(gòu)及性質(zhì)進(jìn)行了一系列的表征;并以EY2-作為光敏劑,TEOA為犧牲劑,構(gòu)建了光催化產(chǎn)氫體系。在最優(yōu)產(chǎn)氫條件下,其析氫速率達(dá)到141.1μmol·h-1,是相同條件下純Ti O2活性的21倍。此外,通過循環(huán)測試研究了產(chǎn)氫體系和復(fù)合催化劑的穩(wěn)定性,并對失活的原因進(jìn)行了初步的探究。
[Abstract]:In recent years, solar photocatalytic decomposition of water for hydrogen production has attracted much attention due to its advantages of low cost, high activity and clean and pollution-free. However, in order to realize the practical application of solar photodissociation, two important problems need to be solved: one is to prepare efficient, stable and low-cost visible light active catalyst, the other is to construct efficient and stable photocatalytic hydrogen production system. Molybdenum disulfide with two dimensional layered structure provides a new way to improve photocatalytic hydrogen production. In this paper, molybdenum disulfide and its nanocomposites with high activity were prepared, and the photocatalytic decomposition of aquatic hydrogen was studied. The reaction temperature was adjusted by using Na2Mo O 4 2H2O as molybdenum source, KSCN as sulfur source and reductant as solvent. The molybdenum disulfide with high hydrogen activity was prepared by solvothermal method under different experimental conditions, and the microstructure, morphology and composition of molybdenum disulfide were characterized. The photocatalytic activity of the catalyst for hydrogen production under visible light (位 420 nm) was investigated and optimized. The 4-MBA@Mo S2 complex was synthesized by reflux method with eosin YEY2 as Guang Min agent and triethanolamine TeOAA as sacrificial agent. The hydrogen evolution rate reached 876 渭 mol h-1 under the optimum hydrogen production conditions, and after four cycles, the hydrogen production activity was basically stable. The complex was characterized. The results show that the composite not only enhances the absorption ability of Mo S2 in visible region, but also increases the absorption of Mo S2 when the coating amount of 4-MBA is 1.5 wt%. The highest hydrogen evolution rate was 1849.6 渭 mol h-1, about 2.1-fold of the unmodified MoS2 activity under the same conditions. The MoS2/Ti O2 nanocomposites were synthesized by solvothermal method and their morphology, composition, structure and properties were characterized. The photocatalytic hydrogen production system was constructed with EY _ 2-as Guang Min agent and TEOA as sacrificial agent. The hydrogen evolution rate reached 141.1 渭 mol h-1 under the optimum condition of hydrogen production, which is 21 times of that of pure TIO 2 under the same conditions. In addition, the stability of hydrogen production system and composite catalyst was studied by cyclic test, and the reason of deactivation was preliminarily investigated.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33;TQ116.2

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