王朋 朱学旺 闫学松 王德松

摘 要：为了提高材料的比表面积和光生电子-空穴的分离效率，以具有高比表面积的多孔SiO2为载体，以价带相匹配的Cu2O和CPAN（环化聚丙烯腈）为催化剂，通过溶液浸渍和原位热处理法制备了Cu2O/CPAN/SiO2复合光催化材料。利用TEM，SEM，XRD，FTIR，BET和EDS等方法对复合物的形貌、组成和结构进行了表征，通过UV-vis，DRS，PL，EIS和光电流等方法分析了复合微粒的光电性能，并以对硝基苯酚还原反应为模型，考察了Cu2O/CPAN/SiO2复合微粒的可见光催化性能。结果表明，多孔SiO2载体大大提高了Cu2O/CPAN的比表面积;Cu2O为八面体晶型，与CPAN构筑的异质结均匀分布于SiO2表面，显著提高了对可见光的吸收及光生电子-空穴对的分离效率。当Cu2O的质量分数为2%、热处理温度为260 ℃、热处理时间为3 h时，制备得到的Cu2O/CPAN/SiO2复合微粒表现出最佳的光催化活性。研究结果为制备高效复合催化剂提供了方法依据。

关键词：催化化学;二氧化硅;氧化亚铜;聚丙烯腈;对硝基苯酚;光催化还原

中图分类号：O643.3 文献标识码：A

doi：10.7535/hbkd.2021yx02008

Study of the preparation of Cu2O/CPAN/SiO2composite material

and its photocatalytic reduction performance

WANG Peng1，ZHU Xuewang2，YAN Xuesong1，WANG Desong2

（1.School of Material Science and Engineering，Hebei University of Science and Technology，Shijiazhuang，Hebei 050018，China; 2.School of Science，Hebei University of Science and Technology，Shijiazhuang，Hebei 050018，China）

Abstract：

With porous SiO2 withhigh specific surface area as the carrier，Cu2O and CPAN with matching valence band as the catalysts，Cu2O/CPAN/SiO2（cuprous oxide/cyclized polyacrylonitrile/silicon dioxide） composite photocatalyst was prepared by solution impregnation and in situ thermal decompositionin order to improve the specific surface area and electron-hole separation efficiency of the material.The morphology，composition and structure of the composite were characterized by TEM，SEM，XRD，FTIR，BET and EDS，and the photoelectric properties of the composite particles were analyzed by UV-VIS，DRS，PL，EIS and photocurrent methods.The visible light photocatalytic properties of Cu2O/CPAN/SiO2composite particles were investigated in the model of the p-nitrophenol reduction.The results show that porous SiO2 carrier greatly increased the specific surface area of Cu2O/CPAN.The Cu2O in octahedral crystal and the heterojunctions of CPAN are evenly distributed on the surface of SiO2 and significantly improve the absorption of visible light and the separation efficiency of photogenerated electron-hole pairs.When the content of Cu2O is 2%，the heat treatment temperature is 260 ℃，and the heat treatment time is 3 h，the prepared Cu2O/CPAN/SiO2composite particles exhibit the best photocatalytic activity.The results provide a method basis for preparing a high-efficiency composite catalyst.

Keywords：

catalytic chemistry; silica; cuprous oxide; polyacrylonitrile; p-nitrophenol; photocatalytic reduction

隨着现代工业的快速发展，大量污染物被排放到环境中，威胁着人类健康，环境污染问题已经受到人们的广泛关注[1]。在过去的几十年里，人们用不同的物理或化学方法致力于处理环境污染问题。其中，绿色光催化技术备受关注[2]，其在解决环境污染和能源危机等方面有着巨大的潜力。

氧化亚铜（Cu2O）是一种重要的金属氧化物半导体，具有无毒、成本低、尺寸可调、响应/恢复速度快、特殊的光学和电学特性等优点，在传感器、超导体、太阳能电池等领域得到了广泛应用[3-11]。……