摘要
以26nm单分散的SiO2球为模板,苯乙烯为碳源,Ni为催化剂,在950℃合成了比表面积为298.2m2/g的中孔石墨碳材料.采用粉末X射线衍射、低温N2吸附、热重分析和透射电镜等对碳材料进行了结构表征.结果发现,通过Ni的催化作用,可在较低温度下得到高度石墨化的中孔碳材料.采用溶胶-凝胶法将TiO2负载在中孔石墨碳材料上,形成TiO2/石墨碳复合材料.以罗丹明B和苯酚的光催化降解为探针反应,考察了TiO2/石墨碳复合材料的光催化降解活性.结果表明,在紫外光照射下,罗丹明B和苯酚在该复合材料上的光催化降解反应遵循一级反应动力学,复合材料对罗丹明B和苯酚的光催化降解活性明显高于相同条件下制备的纯锐钛矿型TiO2.
Mesoporous graphitic carbon with high surface area （298.2 m^2/g） was fabricated at 950℃ using monodisperse colloid SiO2 with diameter of 26 nm as the template, styrene as the carbon precursor, and Ni as the catalyst. The obtained carbon material was characterized by powder X-ray diffraction, N2 adsorption, thermogravimetric analysis, and transmission electron microscopy. The presence of Ni was crucial to the formation of graphitized mesoporous carbon. The TiO2/graphitic carbon composite was prepared by loading TiO2 in the mesopores of the graphitic carbon via the sol-gel method. Both the surface area and pore volume of the composite were significantly reduced in contrast to the mesoporous graphitic carbon. The photoactivity of TiO2/graphitic carbon was investigated by photocatalytic degradation aqueous solutions of rhodamine B and phenol. The degradation of both rhodamine B and phenol followed first-order reaction kinetics, and the composite showed higher photoactivity than the pure anatase TiO2.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期31-36,共6页
基金
辽宁省自然科学基金(2050798)
大连市自然科学基金(2006J23JH019)
关键词
中孔碳
催化石墨化
二氧化钛
罗丹明B
苯酚
光降解
mesoporous carbon
catalytic graphitization
titania
rhodamine B
phenol
photodegradation
