本文選題：鉭酸鹽 + 不同形貌�。� 參考：《南昌航空大學(xué)》2015年碩士論文

【摘要】：化石燃料仍是目前人類的主要能源,近幾個(gè)世紀(jì)以來,蓬勃發(fā)展的工業(yè)帶來了大量的污染物。CO2作為溫室氣體之一,是全球變暖的主要原因。直接將太陽能轉(zhuǎn)化為化學(xué)能而無CO2的排放,仍是目前研究學(xué)者們一個(gè)美好的愿望。自1972年Fujishima和Honda首次報(bào)道半導(dǎo)體在紫外光下可以分解水以來,光催化劑的研究吸引了廣泛的注意,將太陽能轉(zhuǎn)化為干凈的氫能被大量的研究。然而,在眾多光催化分解水系統(tǒng)中,提高太陽能的轉(zhuǎn)化率和產(chǎn)氫效率仍是一項(xiàng)巨大的挑戰(zhàn)。本論文研究了不同形貌的InTaO4和CdS/Bi1-xInx TaO4異質(zhì)結(jié)光催化劑及其光催化分解水的性能。我們首次通過一種多功能的溶膠前驅(qū)體成功制備了InTaO4納米粒、SiO2@InTaO4核殼納米球和InTaO4納米線光催化劑,鉭酸銦不同的形貌展現(xiàn)出了不同的物理化學(xué)性質(zhì)。其中,InTaO4納米線光催化劑表現(xiàn)出了更高的光吸收、更大比表面積以及更好的光催化產(chǎn)氫活性,其在模擬太陽光照射下的光催化產(chǎn)氫速率為29.92μmol·g-1·h-1。并提出了不同形貌InTaO4光催化劑的一個(gè)可能的形成機(jī)制和可能的光催化反應(yīng)機(jī)理。本研究對不同形貌的光催化劑在環(huán)境和能源方面的應(yīng)用提供了一項(xiàng)新進(jìn)展。我們采用更便宜的Ta2O5原材料,通過溶膠-凝膠法合成了一系列的Bi1-xInxTaO4(x=0、0.1、0.3、0.5、0.7、0.9和1.0)光催化劑,并且采用簡單的CdS作為助催化劑合成了不同含量的CdS負(fù)載的CdS/Bi0.5In0.5TaO4異質(zhì)結(jié)復(fù)合光催化劑。實(shí)驗(yàn)結(jié)果表明,Bi0.5In0.5TaO4光催化劑比其它的Bi1-xInxTaO4光催化劑有著更好的光催化活性,并且,30%CdS/Bi0.5In0.5TaO4(30CBITO)異質(zhì)結(jié)光催化劑展示出了最好的光催化產(chǎn)氫活性,在模擬太陽光下的產(chǎn)氫速率達(dá)到了808.01μmol·h-1·g-1,而且,30%CdS/Bi0.5In0.5TaO4光催化劑在經(jīng)歷了60個(gè)小時(shí)的光催化周期反應(yīng)后,產(chǎn)氫速率仍然沒有明顯的衰減。我們還通過紫外可見漫反射(DRS)、X射線衍射(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)以及高分辨率透射電子顯微鏡(HRTEM)對光催化劑的物理化學(xué)性質(zhì)進(jìn)行了表征研究。一個(gè)可能的增強(qiáng)光催化反應(yīng)活性的機(jī)理被提出,并闡明了異質(zhì)結(jié)結(jié)構(gòu)的CdS/Bi0.5In0.5TaO4光催化劑優(yōu)越的光催化產(chǎn)氫活性和長效的穩(wěn)定性。本研究工作為提高沒有貴金屬助催化劑的鉭酸鹽光催化劑的產(chǎn)氫性能開辟了一條新的道路。
[Abstract]:Fossil fuels are still the main energy of human beings. In recent centuries, the booming industry has brought a large number of pollutants. CO2 as one of the greenhouse gases, is the main cause of global warming.Direct conversion of solar energy to chemical energy without CO2 emissions is still a good wish of researchers.Since 1972, when Fujishima and Honda first reported that semiconductors can decompose water under ultraviolet light, the study of photocatalysts has attracted extensive attention. The conversion of solar energy to clean hydrogen energy has been studied extensively.However, in many photocatalytic water decomposition systems, increasing the conversion of solar energy and the efficiency of hydrogen production is still a great challenge.In this paper, the hetero-junction photocatalysts of InTaO4 and CdS/Bi1-xInx TaO4 with different morphologies and their photocatalytic properties for water decomposition have been studied.For the first time, we successfully prepared InTaO4 nanocrystalline SiO2 @ InTaO4 core-shell nanospheres and InTaO4 nanowire photocatalysts through a multifunctional sol precursor. Different morphologies of indium tantalate show different physical and chemical properties.InTaO4 nanowire photocatalyst exhibits higher photoabsorption, larger specific surface area and better photocatalytic hydrogen production activity. The photocatalytic hydrogen production rate under simulated solar irradiation is 29.92 渭 mol g-1 h-1.A possible formation mechanism and a possible photocatalytic reaction mechanism of InTaO4 photocatalysts with different morphologies were also proposed.This study provides a new development in environmental and energy applications of photocatalysts with different morphologies.We have synthesized a series of Bi1-xInxTaO4xO4xO4xO0O0O0OO0O0O01O1O3O5O0.70.9-and 1.0) photocatalysts using cheaper Ta2O5 raw materials, and used simple CdS as co-catalyst to synthesize CdS/Bi0.5In0.5TaO4 heterojunction photocatalysts supported on different contents of CdS.The experimental results show that Bi0.5In0.5TaO4 photocatalyst has better photocatalytic activity than other Bi1-xInxTaO4 photocatalysts, and the 30s / Bi0.5In0.5TaO4 / 30CBITO heterojunction photocatalyst exhibits the best photocatalytic activity for hydrogen production.The hydrogen production rate reached 808.01 渭 mol h-1 g-1 under simulated solar light, and the hydrogen production rate of 30s / Bi0.5In0.5TaO4 photocatalyst did not decrease significantly after 60 hours of photocatalytic periodic reaction.The physical and chemical properties of the photocatalysts were also characterized by UV-Vis diffuse reflectance (DRS) X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM).A possible mechanism for enhancing photocatalytic activity has been proposed, and the excellent photocatalytic activity and long-term stability of heterojunction CdS/Bi0.5In0.5TaO4 photocatalysts have been elucidated.This work opens a new way to improve the hydrogen production performance of tantalate photocatalyst without noble metal catalyst.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ116.2;O643.36

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 李智璐;賀愛華;;靜電紡絲法制備聚合物功能纖維的研究進(jìn)展[J];合成纖維;2015年02期

2 方舒玫;歐延;林敬東;廖代偉;;Cu/Sr_3Ti_2O_7的制備及其光催化分解水制氫活性[J];物理化學(xué)學(xué)報(bào);2007年04期

，

本文編號：1765365