本文選題：鈦酸鹽納米管 + 助催化劑��； 參考：《南昌大學(xué)》2015年碩士論文

【摘要】：本文主要研究了以水熱法合成的鈦酸鹽納米管為半導(dǎo)體,進(jìn)行染料敏化使其在可見光下分解水制氫。研究內(nèi)容主要分為以下兩部分:第一部分:不同鎳鹽修飾的鈦酸鹽納米管通過簡單的浸漬—煅燒法制備,以氮?dú)浠旌蠚庾鳛檫�原劑,研究了不同前驅(qū)體對光催化制氫的影響。不同鎳鹽前驅(qū)體通過離子交換,鎳離子可以吸附在鈦酸鹽納米管的內(nèi)層和外表面,且大部分鎳離子主要吸附在外表面。相對于硝酸鎳和醋酸鎳作為前驅(qū)體,氯化鎳作為前軀體進(jìn)入鈦酸鹽納米管夾層的鎳離子較多。在400 oC還原煅燒過程中,鈦酸鹽納米管轉(zhuǎn)化成二氧化鈦,鎳離子被還原成納米顆粒的金屬鎳,以及部分鎳對TiO2和鈦酸鹽納米管中進(jìn)行了摻雜。在以氯化鎳作為前驅(qū)體的情況下,相的轉(zhuǎn)變以及鎳離子的摻雜比以硝酸鎳和醋酸鎳作為前軀體更有效。內(nèi)層的Ni2+促進(jìn)了相的轉(zhuǎn)變、金屬鎳顆粒的增長和Ni2+摻雜。形成的納米顆粒的金屬鎳在空氣中被氧化形成Ni@NiO核殼結(jié)構(gòu)。鎳離子的摻雜促使了氧空位的形成以及增加了鈦酸鹽納米管的導(dǎo)電性。在可見光(λ≥420 nm)照射下,用三乙醇胺(TEOA)作為電子犧牲劑,以曙紅敏化鎳修飾的鈦酸鹽納米管為催化劑進(jìn)行了光催化制氫研究。與硝酸鹽和醋酸鹽的鎳修飾鈦酸鹽納米管相比,用氯化鎳修飾的鈦酸鹽納米管展現(xiàn)了更高的活性。這可以歸因于用氯化鎳修飾的鈦酸鹽納米管具有更高的導(dǎo)電率和更有效地形成Ni@NiO核殼結(jié)構(gòu)。第二部分:以氯化鎳作為前驅(qū)體修飾鈦酸鹽納米管,進(jìn)一步研究了還原溫度對催化劑制氫活性的影響。在可見光照射下,以三乙醇胺為電子給體,考察了曙紅敏化鎳修飾的鈦酸鹽納米管制氫活性。結(jié)果表明,當(dāng)還原溫度為400 oC時(shí),催化劑顯示出最好的活性。
[Abstract]:In this paper, the dyestuff sensitization of titanate nanotubes synthesized by hydrothermal method to produce hydrogen from water under visible light was studied. The main contents of the study are as follows: in the first part, the effects of different precursors on photocatalytic hydrogen production were studied by simple impregnation and calcination of titanate nanotubes modified with different nickel salts, using nitrogen-hydrogen mixture as reducing agent. Nickel ions can be adsorbed on the inner and outer surfaces of titanate nanotubes by ion exchange, and most of the nickel ions are mainly adsorbed on the outer surface. Compared with nickel nitrate and nickel acetate as precursors, nickel chloride as precursor enters the interlayer of titanate nanotubes with more nickel ions. During the reduction and calcination of 400oC, titanate nanotubes were converted into titanium dioxide, nickel ions were reduced to metal nickel nanoparticles, and some nickel was doped into TiO2 and titanate nanotubes. In the case of nickel chloride as precursor, the phase transition and doping of nickel ion are more effective than nickel nitrate and nickel acetate as precursors. The Ni2 in the inner layer promotes the phase transition, the growth of nickel particles and the doping of Ni2. The formed nickel nanoparticles were oxidized in air to form Ni@NiO core-shell structure. The doping of nickel ions promotes the formation of oxygen vacancies and increases the conductivity of titanate nanotubes. Under visible light (位 鈮，

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