多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用（英文）

Porous Bamboo Charcoal/TiO_2 Nanocomposites: Preparation and Photocatalytic Property

本工作合成了一种具有高吸附性能和光催化性能的表面改性竹炭/二氧化钛(SMBC/TiO_2)纳米复合材料。通过湿法氧化处理廉价、天然绿色的竹炭(BC),制备了具有良好吸附性、化学稳定性的表面改性竹炭(SMBC)。经过改性, BC表面生成大量含氧官能团,因此SMBC粒子易分散于水中,并且与TiO_2有较强的相互作用,确保TiO_2均匀地负载在SMBC表面。SMBC/TiO_2比BC/TiO_2有更大的比表面积,能提供更强的吸附性能。SMBC/TiO_2的饱和吸附容量大约是BC/TiO_2的1.6倍,是TiO_2的12.1倍。吸附和催化的协同作用使SMBC/TiO_2复合材料降解MB具有更高的光催化活性, SMBC/TiO_2光催化降解MB的速率常数分别是BC/TiO_2和TiO_2的7倍和6倍。

Here we report a novel surface modified bamboo charcoal/TiO2(SMBC/TiO2)nanocomposites with high adsorption and photocatalytic property.SMBC were prepared by a wet oxidization method of cheap natural bamboo charcoal(BC)with good absorbent and chemical stabilities.After modification,high density of carboxyl groups were generated on the surface of BC,thus SMBC particles can be easily dispersed in water and have stronger interactions with TiO2 nanoparticles,which ensure SMBC uniformly coated on TiO2.And SMBC/TiO2 nanocomposties have much higher specific surface area than BC/TiO2,which could offer higher adsorption capacity.The saturated adsorption capacity of SMBC/TiO2 is approximately 1.6 times,12.1 times as great as BC/TiO2 and pure TiO2,respectively.The synergetic effect of adsorption and catalysis endow SMBC/TiO2 composites much higher photocatalytic activity than BC/TiO2 and pure TiO2 for MB degradation,and the rate constant for MB photocatalytic degradation of SMBC/TiO2 was almost 7 times and 6 times as large as BC/TiO2 and pure TiO2,respectively.