CO_2在铜掺杂的TiO_2纳米管中的光催化还原研究  

Copper-doped TiO_2 nanotube:characterization and photocatalytic reduction activity for CO_2

作　　者：张宏忠[1,2,3] 张钰 叶长明[1,2,3] 王明花 秦小青[1,2,3] 李华中 

机构地区：[1]郑州轻工业学院材料与化学工程学院,郑州450001 [2]中国轻工业污染治理与资源化重点实验室,郑州450001 [3]环境污染治理与生态修复河南省协同创新中心,郑州450001

出　　处：《化工新型材料》2017年第11期124-127,共4页New Chemical Materials

基　　金：河南省高校科技创新人才支持计划(2013HASTIT031);污染治理与生态修复河南省协同创新中心开放基金(XTCX-005)

摘　　要：分别通过阳极氧化法和电沉积法制备了TiO_2纳米管及铜掺杂的TiO_2纳米管(CuxOy/TiO_2纳米管)复合材料。利用X射线粉末衍射仪、扫描电子显微镜和X射线能谱分析等手段对材料进行表征。结果表明:用阳极氧化法制备的TiO_2纳米管为锐钛矿型,平均管直径为90~110nm,平均管长为300nm左右;采用电沉积法制备的CuxOy/TiO_2纳米管中铜以CuO的形式存在。在密封悬挂式光催化系统中,研究不同浓度CuSO_4电镀液制备的CuO/TiO_2纳米管对CO_2的光催化还原行为。在500W氙灯光照的条件下,TiO_2纳米管和CuO/TiO_2纳米管还原CO_2的产物是CO和CH_4;TiO_2纳米管在光照6h时,CH_4的产率达到1.3×10^(-6)/(cm^2·h),而0.04mol/L CuSO4电镀液制备的CuO/TiO_2纳米管在同样条件下,CH_4的产量达到3.7×10^(-6)/(cm^2·h)。这说明CuO/TiO_2纳米管显著提高了CO_2的光催化还原效率。By using the methods of anodic oxidation and electrodeposition,TiO2 NTs and copper-doped TiO2 NTs（CuxOy/TiO2 NTs） were prepared,respectively.The obtained TiO2 NTs and CuxOy/TiO2 NTs were characterized by X-ray diffraction,scanning electron microscopy and X-ray photoelectron spectroscopy.The results showed that TiO2 NTs prepared by anodic oxidation were in anatase type with average tube diameter of 90 nm to 110 nm and average length of about 300 nm.As well as the copper in CuxOy/TiO2 NTs prepared by electrodeposition was in the form of CuO.In a sealed photocatalytic system,the photocatalytic reduction activity of CuO/TiO2 NTs for CO2 was investigated.Under the condition of UV light,both TiO2 NTs and CuO/TiO2 NTs can reduce CO2 into CO and CH4.The production rate of CH4 with TiO2 NTs and CuO/TiO2 NTs（prepared in the plating solution of 0.04 mol/L CuSO4）was 1.3×10^-6/（cm^2·h）and 3.7×10^-6/（cm^2·h）during 6 h UV light,respectively.Therefore,CuO/TiO2 NTs can significantly improve the efficiency of photocatalytic reduction for CO2.

关 键 词：铜掺杂 TIO2纳米管 光催化 还原 CO2 CO 甲烷 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TB383.1[一般工业技术—材料科学与工程]