(南京工業(yè)大學(xué) 材料化學(xué)工程國家重點實驗室，南京 210009)
摘 要: 以介孔氧化鈦MTiO2為鈦源，葡萄糖為碳源，在500 ℃的N2保護(hù)下合成新型介孔碳−氧化鈦納米復(fù)合材料(CMT)。采用X射線衍射、熱重和低溫N2物理吸附方法對CMT的結(jié)構(gòu)進(jìn)行表征，同時以甲基橙為目標(biāo)污染物評價CMT的吸附性能和光催化降解性能。結(jié)果表明：隨著碳含量的增加，CMT的吸附性增強(qiáng)，但過量的碳會使CMT的光催化性能下降。當(dāng)碳含量為2%時，納米復(fù)合材料(003CMT)呈現(xiàn)高結(jié)晶度的銳鈦晶型，生成的碳分散在MTiO2內(nèi)、外壁面，比表面積為69.8 m2/g，孔容為0.22 cm3/g，孔徑為9.69 nm；紫外光催化降解能力超過原有的MTiO2的，說明通過調(diào)整碳含量可以讓CMT發(fā)揮碳的吸附和介孔TiO2光催化的協(xié)同效應(yīng)，提高其光催化性能。
關(guān)鍵字: 碳；介孔氧化鈦；吸附；光催化
novel mesoporous carbon-titania nanocomposites
（State Key Laboratory of Materials-oriented Chemical Engineering,
Nanjing University of Technology, Nanjing 210009, China）
Abstract:Using mesoporous titania (MTiO2) as titanium source and glucose as carbon precursor, the novel mesoporous carbon-titania nanocomposite (CMT) was synthesized at 500 ℃ under N2 atmosphere. The structure properties of nanocomposites were characterized by X-ray diffracometry, thermogravimetry and low temperature N2 physical adsorption experiment. The adsorptive and UV photocatalytic properties of CMT were evaluated by decolorization of methyl orange. The results show that, with increasing the carbon content, the adsorptive performance of the nanocomposite increases while the UV photocatalytic performance decreases. When the carbon content is 2%, the nanocomposite (003CMT) presents high crystalline anatase phase and the carbon obtained by the pyrolysis of glucose is well dispersed on the wall of MTiO2 with specific surface area of 69.8 m2/g, pore volume of 0.22 cm3/g and pore size of 9.69 nm. The photocatalytic performance of 003CMT is higher than that of MTiO2, indicating that 003CMT can exert the synergy effect of the absorption of carbon and photocatalytic degradation of MTiO2.
Key words: carbon; mesoporous TiO2; absorption; photocatalysis
