摘要
文章采用水热法两步制备了Cu_2O/Eu_2O_3-TiO_2复合光催化剂,利用X射线衍射仪(XRD)、透射电镜(TEM)、紫外可见漫反射仪(UV-vis DRS)和X射线光电子能谱仪(XPS)对所制得的光催化剂进行了分析和表征。表征结果表明:在复合光催化剂中TiO_2呈不规划的薄片状,Cu_2O和Eu_2O_3不均匀分散在薄片上;以乙酸为牺牲剂,考察不同Cu_2O/Eu_2O_3-TiO_2复合光催化剂的光催化产生氢气和烷烃的性能,实验结果表明:光催化的气体产物中氢气和烷烃比例随催化剂种类的改变而改变;20.7%Cu_2O/6%Eu_2O_3-TiO_2复合光催化剂产氢气和烷烃的性能最佳;20.7%Cu_2O/6%Eu_2O_3-TiO_2光催化乙酸的特征气体产物是氢气、甲烷、乙烷。
Cu_2O/Eu_2O_3-TiO_2 composites are synthesized through a two-steps hydrothermal method. The crystal structure and morphology of the as-prepared product were characterized using X-ray diffraction(XRD), UV-vis diffuse reflectance spectroscopy(UV-vis DRS) and transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). In Cu_2O/Eu_2O_3-TiO_2 composite, TiO_2 is of lamellar structure, unevenly dispersed by Cu_2O and Eu_2O_3 nanoparticles. Using acetic acid as sacrificial agent, the photocatalytic activity for production of hydrogen and alkanes over different Cu_2O/Eu_2O_3-TiO_2 composites have been investigated. The experimental results show that the distributions of hydrogen and alkanes in gaseous products depend on kinds of photocatalysts. 20.7% Cu_2O/6% Eu_2O_3-TiO_2 photocatalyst exhibits the best performance for photocatalytic production of hydrogen and alkanes. The characteristic gaseous products of photocatalytic degradation of acetic acid over 20.7% Cu_2O/6% Eu_2O_3-TiO_2 composites are hydrogen gas, methane and ethane.
引文
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