(1. 中南大學 材料科學與工程學院，長沙 410083；2. 中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 以鈦酸丁酯為原料，乙酸為有機配體，甲酰胺為干燥控制化學添加劑(DCCA)，采用溶膠−凝膠法制備碳納米管(CNTs)摻雜TiO2復合醇凝膠，并結合常壓干燥等后續(xù)工藝，制備了CNTs摻雜TiO2塊體氣凝膠。采用XRD、BET、TEM、SEM、EDS、DSC及FT-IR等對樣品進行表征。結果表明：制備態(tài)CNTs摻雜TiO2氣凝膠晶型為無定型，比表面積為601.7 m2/g；在氮氣保護下，經(jīng)950 ℃熱處理后，比表面積為136.8 m2/g，TiO2以銳鈦礦相存在，且均勻密集包覆在CNTs表面，對甲基橙光降解具有較高光催化活性。
關鍵字: CNTs-TiO2氣凝膠；溶膠−凝膠法；常壓干燥法
（1. School of Material Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Monolithic TiO2 aerogels doped with CNTs were prepared by sol-gel method and subsequent process with ambient pressure drying using titanate tetrabutoxide, acetic acid and formamide as raw material. The XRD, BET, TEM, SEM, EDS, DSC and FT-IR were used to characterize the samples. The results indicate that the as-prepared CNTs-TiO2 aerogel is in amorphous state with the specific surface area of 601.7 m2/g. After calcined at 950 ℃ in nitrogen, the anatase is the main crystalline phase and the surface area is 136.8 m2/g. TiO2 particulates absorb uniformly and densely on the surface of CNTs. The synthetic aerogels present excellent photocatalytic activity in the photodegradation of methyl orange.
Key words: CNTs-TiO2 aerogel; sol-gel; ambient pressure drying
