ZnCo_2O_4纳米粒子的可见光催化性能(英文)

Visible Light Induced Photocatalytic Activity of ZnCo_2O_4 Nanoparticles

研究了共沉淀分解法制备的ZnCo_2O_4纳米粒子的光学和可见光催化性能,并对其晶体结构和微观结构用X射线衍射、热重/差热分析、透射电镜和高分辨透射电镜等手段进行了表征.结果表明,制备的纳米粒子为纯相的ZnCO_2O_4,平均粒径约为10-20 nm.紫外-可见吸收光谱估计出ZnCo_2O_4纳米粒子的能带隙为3.39和2.09 eV.可见光(λ>420 nm)照射下,纳米粒子表现出降解亚甲基蓝溶液的光催化活性.ZnCo_2O_4纳米粒子的光催化活性可以归结为紫外和可见光下纳米粒子吸收光子(能量大于能带隙)的能力,以及它们的纳米尺寸,基于实验结果,本文提出了ZnCO_2O_4可能的能带结构.

ZnCo204 nanoparticles were synthesized by a co-precipitation decomposition method and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction （XRD）, thermogravimetry （TG）/differential scanning calorimetry （DSC）, transmission electron microscopy （TEM）, and high-resolution transmission electron microscopy （HRTEM）. The ZnC02O4, nanocrystallites obtained were single-phase with an average size of 10-20 nm. The optical bandgap energies of the nanoparticles were estimated to be 3.39 and 2.09 eV from the UV-Vis absorption spectrum. The ZnC02O4 nanoparticles exhibited high photocatalytic activity for the degradation of methylene blue dye solution under visible light irradiation （A〉420 nm）. The photocatalytic activity of the ZnC02O4 nanoparticles is attributed to their ability to absorb bandgap photons under UV and visible light as well as their nanoscale particle size. Based on these experimental results, a possible band structure of ZnC02O4 is proposed.