金属铜及其氧化物复合光催化剂的制备及性能研究
发布时间：2018-11-02 11:02
【摘要】：为了研究非贵金属Cu及Cu20在可见光光催化中的应用,解决其性能和稳定性不高的问题,本论文采用Ti02纳米管、类石墨碳氮化碳(g-C3N4)进行复合,制备了Cu2O/TiO2纳米管阵列、Cu/TiO2纳米管阵列以及g-C3N4/Cu20复合可见光光催化剂,系列表征了其结构与光电性能,研究了光催化水解产氢、光催化降解有机物的性能。主要工作内容和结论如下：(1)用电化学的方法在Ti02纳米管阵列上沉积负载Cu20,发现沉积偏压对Cu20的形貌影响很大。并首次考察了不同形貌的Cu2O/TiO2内米管阵列在可见光下的光催化产氢性能。结果发现,当沉积偏压为-0.8 V时,其可见光光催化产氢性能是纯Ti02纳米管阵列的42.4倍。本工作展示了一种既方便又简单的电化学沉积方法,制备出一种高效、可循环使用的可见光光催化产氢催化剂。(2)采用脉冲电化学方法在Ti02纳米管阵列上沉积纳米Cu,通过改变沉积的循环次数控制纳米Cu的含量。对比纯的Ti02纳米管阵列,Cu/TiO2内米管阵列复合物在可见光区域560 nm处有一个很强的吸收峰,此峰证明复合物中的纳米Cu具有很强的等离子共振效应。通过在可见光照射下的光电化学和光催化产氢性能考察,发现这种新型的Cu/TiO2纳米管阵列光催化剂在没有Pt作为助催化剂的条件下也具有很好的产氢性能,相同条件下,最佳Cu/TiO2纳米管阵列复合物的产氢速率(3.0μmol/(h·cm2))是纯Ti02纳米管阵列(0.28μmol/(h·cm2))的10.7倍。(3)利用溶胶-凝胶法制备出g-C3N4,用化学沉淀法制备Cu20的同时与g-C3N4复合形成g-C3N4/Cu20复合纳米材料,通过控制加入g-C3N4的量来获得不同g-C3N4含量的g-C3N4/Cu2O。在可见光照下,对比g-C3N4/Cu2O、纯g-C3N4和纯Cu20降解AO-Ⅱ的催化性能,发现g-C3N4/Cu2O具有最好的电子空穴分离能力,g-C3N4质量含量在10%时,光催化性能最优。
[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，
本文编号：2305827
[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，
本文编号：2305827
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