多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用

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/TiO₂)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TiO₂有较强的相互作用, 确保TiO₂均匀地负载在SMBC表面。SMBC/TiO₂比BC/TiO₂有更大的比表面积, 能提供更强的吸附性能。SMBC/TiO₂的饱和吸附容量大约是BC/TiO₂的1.6倍, 是TiO₂的12.1倍。吸附和催化的协同作用使SMBC/TiO₂复合材料降解MB具有更高的光催化活性, SMBC/TiO₂光催化降解MB的速率常数分别是BC/TiO₂ 和TiO₂的7倍和6倍。

Porous Bamboo Charcoal/TiO2 Nanocomposites: Preparation and Photocatalytic Property

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.