【摘要】：為了研究非貴金屬Cu及Cu20在可見光光催化中的應(yīng)用,解決其性能和穩(wěn)定性不高的問題,本論文采用Ti02納米管、類石墨碳氮化碳(g-C3N4)進(jìn)行復(fù)合,制備了Cu2O/TiO2納米管陣列、Cu/TiO2納米管陣列以及g-C3N4/Cu20復(fù)合可見光光催化劑,系列表征了其結(jié)構(gòu)與光電性能,研究了光催化水解產(chǎn)氫、光催化降解有機(jī)物的性能。主要工作內(nèi)容和結(jié)論如下：(1)用電化學(xué)的方法在Ti02納米管陣列上沉積負(fù)載Cu20,發(fā)現(xiàn)沉積偏壓對(duì)Cu20的形貌影響很大。并首次考察了不同形貌的Cu2O/TiO2內(nèi)米管陣列在可見光下的光催化產(chǎn)氫性能。結(jié)果發(fā)現(xiàn),當(dāng)沉積偏壓為-0.8 V時(shí),其可見光光催化產(chǎn)氫性能是純Ti02納米管陣列的42.4倍。本工作展示了一種既方便又簡(jiǎn)單的電化學(xué)沉積方法,制備出一種高效、可循環(huán)使用的可見光光催化產(chǎn)氫催化劑。(2)采用脈沖電化學(xué)方法在Ti02納米管陣列上沉積納米Cu,通過改變沉積的循環(huán)次數(shù)控制納米Cu的含量。對(duì)比純的Ti02納米管陣列,Cu/TiO2內(nèi)米管陣列復(fù)合物在可見光區(qū)域560 nm處有一個(gè)很強(qiáng)的吸收峰,此峰證明復(fù)合物中的納米Cu具有很強(qiáng)的等離子共振效應(yīng)。通過在可見光照射下的光電化學(xué)和光催化產(chǎn)氫性能考察,發(fā)現(xiàn)這種新型的Cu/TiO2納米管陣列光催化劑在沒有Pt作為助催化劑的條件下也具有很好的產(chǎn)氫性能,相同條件下,最佳Cu/TiO2納米管陣列復(fù)合物的產(chǎn)氫速率(3.0μmol/(h·cm2))是純Ti02納米管陣列(0.28μmol/(h·cm2))的10.7倍。(3)利用溶膠-凝膠法制備出g-C3N4,用化學(xué)沉淀法制備Cu20的同時(shí)與g-C3N4復(fù)合形成g-C3N4/Cu20復(fù)合納米材料,通過控制加入g-C3N4的量來獲得不同g-C3N4含量的g-C3N4/Cu2O。在可見光照下,對(duì)比g-C3N4/Cu2O、純g-C3N4和純Cu20降解AO-Ⅱ的催化性能,發(fā)現(xiàn)g-C3N4/Cu2O具有最好的電子空穴分離能力,g-C3N4質(zhì)量含量在10%時(shí),光催化性能最優(yōu)。
[Abstract]:In order to study the application of non-precious metal Cu and Cu20 in visible light catalysis and to solve the problem that their properties and stability are not high, Cu2O/TiO2 nanotube arrays were prepared by using Ti02 nanotubes and graphite-like carbon nitride (g-C3N4) composites. The structure and photoelectric properties of Cu/TiO2 nanotube arrays and g-C3N4/Cu20 composite visible photocatalysts were characterized. The photocatalytic hydrolysis of hydrogen and the photocatalytic degradation of organic compounds were studied. The main work and conclusions are as follows: (1) Electrochemical deposition of loaded Cu20, on Ti02 nanotube arrays shows that the deposition bias has a great influence on the morphology of Cu20. The photocatalytic hydrogen production of Cu2O/TiO2 inner rice tube arrays with different morphologies under visible light was investigated for the first time. The results show that when the deposition bias is -0.8 V, the visible photocatalytic hydrogen production is 42.4 times higher than that of pure Ti02 nanotube arrays. This work shows a convenient and simple electrochemical deposition method to prepare a highly efficient and recyclable visible photocatalytic catalyst for hydrogen production. (2) Cu, nanocrystals were deposited on Ti02 nanotube arrays by pulsed electrochemical method. The content of nanometer Cu was controlled by changing the number of cycles of deposition. Compared with pure Ti02 nanotube arrays, Cu/TiO2 nanotube arrays have a strong absorption peak at the visible region of 560 nm, which proves that the nanocomposites have a strong plasmon resonance effect. The photochemical and photocatalytic hydrogen production properties of this novel Cu/TiO2 nanotube array photocatalyst were investigated under visible light irradiation. It was found that the novel Cu/TiO2 nanotube array photocatalyst also had good hydrogen production performance without Pt as a co-catalyst. The optimal hydrogen production rate of Cu/TiO2 nanotube array composites (3.0 渭 mol/ (h cm2) was 10.7 times higher than that of pure Ti02 nanotube arrays (0.28 渭 mol/ (h cm2). (3) g-C _ 3N _ 4 was prepared by sol-gel method. Cu20 and g-C3N4 were prepared by chemical precipitation method to form g-C3N4/Cu20 composite nanomaterials. G-C _ 3N _ 4 / Cu _ 2O with different g-C3N4 content was obtained by controlling the amount of g-C3N4. Compared with g-C _ 3N _ 4 / Cu _ 2O, pure g-C3N4 and pure Cu20 in the degradation of AO- 鈪，

本文編號(hào)：2305827