新型介孔碳-氧化钛纳米复合材料的制备及协同效应

Preparation and synergy effect of novel mesoporous carbon-titania nanocomposites

以介孔氧化钛MTiO2为钛源,葡萄糖为碳源,在500℃的N2保护下合成新型介孔碳-氧化钛纳米复合材料(CMT)。采用X射线衍射、热重和低温N2物理吸附方法对CMT的结构进行表征,同时以甲基橙为目标污染物评价CMT的吸附性能和光催化降解性能。结果表明:随着碳含量的增加,CMT的吸附性增强,但过量的碳会使CMT的光催化性能下降。当碳含量为2%时,纳米复合材料(003CMT)呈现高结晶度的锐钛晶型,生成的碳分散在MTiO2内、外壁面,比表面积为69.8m2/g,孔容为0.22cm3/g,孔径为9.69nm;紫外光催化降解能力超过原有的MTiO2的,说明通过调整碳含量可以让CMT发挥碳的吸附和介孔TiO2光催化的协同效应,提高其光催化性能。

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 m^2/g,pore volume of 0.22 cm^3/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.