花球状Ti_(3)C_(2)/TiO_(2)复合材料的制备及其光催化性能

Preparation and photocatalytic properties of flower-like sphere Ti_(3)C_(2)/TiO_(2) composites

利用二维(2D)层状Ti_(3)C_(2)衍生出三维(3D)花球状Ti_(3)C_(2)/TiO_(2)复合材料。通过XRD、SEM、TEM、UV-Vis DRS和PL对材料进行了表征,并比较不同温度下合成的Ti_(3)C_(2)/TiO_(2)的光催化活性。结果表明,500℃下合成的Ti_(3)C_(2)/TiO_(2)对酸性品红(AF)表现出更好的光催化降解效率,光催化反应90 min,AF降解率达到97.57%。Ti_(3)C_(2)凭借其高导电性以及与TiO_(2)界面形成的肖特基势垒有效地提高了电荷分离率,抑制了电子-空穴对的复合,从而提高了材料的光催化活性。此外,光催化剂稳定性较好,循环5次后,AF降解率仍能达到86.39%。活性物种捕获实验表明,空穴(h^(+))和超氧自由基(·O_(2)^(–))是降解AF的主要活性物质。

Three-dimensional(3D)flower-like sphere Ti_(3)C_(2)/TiO_(2) composite materials were derived from two-dimensional(2D)layered Ti_(3)C_(2).The materials were characterized by XRD,SEM,TEM,UV-Vis DRS and PL.The photocatalytic activity of Ti_(3)C_(2)/TiO_(2) samples synthesized at different temperatures was compared.The results showed that Ti_(3)C_(2)/TiO_(2) synthesized at 500℃exhibited better photocatalytic degradation efficiency for acid fuchsin(AF).After 90 min of photocatalytic reaction,the degradation rate reached 97.57%.By virtue of its high conductivity and Schottky barrier formed at the interface with TiO_(2),Ti_(3)C_(2) effectively improved the charge separation rate and inhibited the recombination of electron hole pairs,thus improving the photocatalytic activity of the material.In addition,the photocatalyst had good stability.After five cycles of use,the AF degradation rate could still reach 86.39%.Active species capture experiments indicated that holes(h^(+))and superoxide radicals(·O_(2)^(–))were the main active substances for AF degradation.