| 还原氧化石墨烯/介孔TiO2复合材料的合成及其光解水制氢性能 | |
| Synthesis and Photocatalytic Performance of Mesoporous rGO/m-TiO2 Composites for Hydrogen Production by Photocatalytic Water Splitting | |
| 摘要: 采用溶胶凝胶法，以钛酸四异丙酯（TTIP）为钛源，十六烷基三甲基溴化铵（CTAB）为模板剂合成了介孔二氧化钛样品m-TiO2，考察了合成温度、水量、模板剂用量和焙烧温度对其在紫外光条件下光催化产氢活性的影响。结果显示，在350℃下焙烧后，样品由无定形结构转变为锐钛矿相；随着焙烧温度的提高，锐钛矿相结构产物的结晶度提高，当焙烧温度超过550℃后，样品大部分转变为金红石相。以合成温度为30℃，模板剂用量（nCTAB/nTiO2）为0.2，水量（nH2O/nTiO2）为100，焙烧温度为450℃条件下合成的m-TiO2样品为催化剂，当催化剂用量为0.4 g·L-1，体系中甲醇浓度高于20%（V/V）时，其紫外光条件下的光催化产氢活性达170 mmol·g-1·h-1。采用水热法将氧化石墨烯（GO）与m-TiO2复合制备了一系列还原氧化石墨烯/介孔TiO2复合材料（rGO/m-TiO2），其晶相结构为锐钛矿相。当rGO复合量（wGO/wTiO2）为0.01时，样品在紫外光下的产氢活性为241 mmol·g-1·h-1，能量转化效率达7.4%，较未复合样品提高了42.3%；在可见光条件下，其产氢活性达9 mmol·g-1·h-1。 | |
| 关键词: 介孔材料 二氧化钛 光催化 制氢 水分解 | |
| 基金项目: | |
| Abstract: Mesoporous titanium dioxide (m-TiO2) was synthesized by using Titanium tetraisopropanolate (TTIP) as the raw material and cetyltrimethyl ammonium bromide (CTAB) as the template via sol-gel method. The effects of the synthesis temperature, the amount of H2O and template in the initial gel, as well as the calcination temperature on the photocatalytic hydrogen production activity of m-TiO2 were investigated. The results show that the structure of the m-TiO2 sample transferred from amorphous to anatase phase after calcined under 350℃ for 3 h. The crystallinity of the anatase phase increased with calcination temperature increasing and most of the anatase phase transferred to rutile phase after calcined above 550℃. The sample which synthesized at 30℃, with nCTAB/nTiO2=0.2 and nH2O/nTiO2=100, then calcined at 450℃ showed excellent photocatalytic activity of splitting water under UV irradiation. When the amount of catalyst was 0.4 g·L-1 and the methanol concentration was 20%(V/V), the hydrogen production rate of m-TiO2 reached as high as 170 mmol·g-1·h-1. A series of rGO/m-TiO2 samples with different amount of rGO were synthesized by using hydrothermal method. When wGO/wTiO2 was 0.01, the hydrogen production rate of the sample was 241 mmol·g-1·h-1 under UV light irradiation, and the energy conversion efficiency reached 7.4%, 42.3% higher than that of m-TiO2. Under visible light irradiation, its hydrogen production rate reached 9 mmmol·g-1·h-1. | |
| Keywords: mesoporous materials titanium dioxidetitanium photocatalysis hydrogen production water splitting | |
| 投稿时间：2018-05-16 修订日期：2018-09-25 | |
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| 谢怡婷,谭涓,王亚飞,于靖,刘靖.还原氧化石墨烯/介孔TiO2复合材料的合成及其光解水制氢性能[J].无机化学学报,2018,34(12):2153-2160. | |
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