本文選題：氫氣泡模板法 + 濕化學(xué)法　； 參考：《東南大學(xué)》2017年碩士論文

【摘要】：多孔材料的顯著優(yōu)點(diǎn)是具有大的比表面積,可為吸附和催化提供大量位點(diǎn),因而在清潔和催化等領(lǐng)域具有廣泛的應(yīng)用前景。氫氣泡模板法是一種用于制備微納米多孔金屬的電化學(xué)方法,該法具有簡單易行的特點(diǎn)。本研究以氫氣泡模板法為基礎(chǔ)制備新型微納米多孔金屬催化劑。本文首先研究了氫氣泡模板法中添加劑、沉積時(shí)間和沉積電流密度對(duì)多孔銅形貌和結(jié)構(gòu)的影響,通過向沉積液(0.2MCuSO4+1MH2SO4)中添加不同的離子,制備出了玉米芯狀(無添加劑)、苞狀(添加BTA)和雪松狀(添加KCl+K2S04+NH4Cl)多孔銅簇。隨著沉積時(shí)間的延長,沉積電流密度的增大,玉米芯狀和雪松狀三維多孔結(jié)構(gòu)層數(shù)增加,韌帶逐漸致密,枝晶稍有粗化,苞狀銅簇苞枝晶有所增大。沉積出的多.孔銅對(duì)于偶氮染料直接藍(lán)15具有明顯的催化降解能力,且銅簇形貌、降解溫度、PH值、雙氧水濃度、銅簇質(zhì)量和直接藍(lán)15濃度對(duì)降解效率均有顯著影響。其次,本文通過氫氣泡模板法制備了微納米多孔金簇,研究了沉積溫度和沉積時(shí)間對(duì)多孔金簇形貌、結(jié)構(gòu)和電化學(xué)性能的影響。隨著沉積時(shí)間的延長和沉積溫度的提高,樣品的三維多孔結(jié)構(gòu)層數(shù)增加,韌帶逐漸致密,枝晶密度增大。在堿性和中性條件下,所有樣品均有明顯的葡萄糖催化效果,在25℃下沉積300s的樣品,其催化效果最佳,堿性條件下正向掃描時(shí)的葡萄糖的氧化峰位于0.492V(vsHg/HgO)處,中性條件下正向掃描時(shí)的氧化峰位于0.405V(vs Ag/AgCl)。最后,本文結(jié)合氫氣泡模板法和濕化學(xué)方法,制備了以多孔銅簇為模板的Au-Cu雙金屬復(fù)合材料,用于葡萄糖的催化氧化。研究了置換時(shí)間、置換反應(yīng)溶劑和模板形貌對(duì)雙金屬催化劑的形貌、成分以及催化性能的影響。研究表明,置換后樣品的多孔結(jié)構(gòu)均在一定程度上發(fā)生坍塌,枝晶逐漸退化。多孔結(jié)構(gòu)和枝晶結(jié)構(gòu)的劣化隨置換時(shí)間的延長而加深,金含量隨置換時(shí)間的增加而增加。而置換后所得樣品對(duì)堿性溶液中葡萄糖氧化的催化效果則在置換時(shí)間為5分鐘時(shí)達(dá)到最佳。置換溶劑中乙二醇的加入可以降低置換速度,在一定程度上延緩結(jié)構(gòu)劣化。純乙二醇溶液中的置換反應(yīng)則非常緩慢,金含量很低,因此在乙二醇和水的混合溶液中置換后所得的樣品對(duì)葡萄糖氧化的催化效果最佳。玉米芯狀、苞狀和雪松狀多孔銅簇置換后的樣品均發(fā)生了明顯的結(jié)構(gòu)劣化,其中玉米芯狀和苞狀銅簇的劣化現(xiàn)象尤為顯著,雪松狀多孔銅簇置換后的樣品對(duì)葡萄糖氧化的催化效果最佳。
[Abstract]:The advantages of porous materials are that they have a large specific surface area and can provide a large number of sites for adsorption and catalysis, so they have a wide application prospect in the fields of cleaning and catalysis.Hydrogen bubble template method is an electrochemical method for the preparation of micro-and nano-porous metals.In this study, a novel porous metal catalyst was prepared by hydrogen bubble template method.In this paper, the effects of additives, deposition time and deposition current density on the morphology and structure of porous copper in hydrogen bubble template were studied. Different ions were added to the deposit solution of 0.2MCuSO4 1MH2SO4).The corncob (without additive), bract (BTAs) and cedar (KCl K2S04 NH4Cl) clusters were prepared.With the prolongation of deposition time, the deposition current density increased, the number of corncob and cedar three-dimensional porous layers increased, the ligaments became denser, the dendrite became slightly coarse, and the bract copper cluster bract dendrite increased.There is much deposition.Pore copper has obvious catalytic degradation ability to azo dye direct blue 15, and the morphology of copper cluster, degradation temperature and PH value, hydrogen peroxide concentration, copper cluster mass and direct blue 15 concentration have significant effects on degradation efficiency.Secondly, microporous gold clusters were prepared by hydrogen bubble template method. The effects of deposition temperature and deposition time on the morphology, structure and electrochemical properties of porous gold clusters were studied.With the prolongation of deposition time and the increase of deposition temperature, the number of three-dimensional porous structure layers increased, the ligaments became denser and the dendritic density increased.Under alkaline and neutral conditions, all the samples had obvious catalytic effect on glucose. The best catalytic effect was obtained when the samples were deposited at 25 鈩，

本文編號(hào)：1752972