Ti_(0.9925)Co_(0.0075)O_2粉末的制备及退火处理后的光催化性能研究

Photocatalytic Properties of the as-prepared and Annealed Ti_(0.9925)Co_(0.0075)O_2 Powders

以钛酸正丁酯、六水硝酸钴等为原料制备了溶液前驱体,将前驱体置于高压反应釜中170℃反应7 h,得到Ti0.9925Co0.0075O2粉末样品.然后将样品在空气氛围下550℃进行退火处理,得到退火处理的Ti0.9925Co0.0075O2粉末样品.利用X射线衍射仪(XRD)和拉曼光谱(Raman)对样品的结构进行表征.利用紫外—可见光谱(UV-Vis)以罗丹明B溶液为目标降解物,考察了样品的光催化性能.研究发现,未退火处理和退火处理的Ti0.9925Co0.0075O2粉末样品均为锐钛矿结构.退火处理的Ti0.9925Co0.0075O2粉末样品结晶更完善,晶粒尺寸长大.光催化研究结果表明,未退火处理的样品光催化活性较好,退火处理的样品光催化活性稍差.

The solution precursors were synthesized from Tetra-n-butyl Titanate and cobaltous nitrate,etc. The Ti0. 9925Co0. 0075O2 powders were prepared by treating the precursors at 170 ℃ in a Teflon-lined stainless steel autoclave for 7 h. The as-prepared Ti0. 9925Co0. 0075O2 powders were annealed in air under 550 ℃. The crystal structures of the samples were analyzed by X-ray diffraction（ XRD） and Raman spectroscopy. We studied the photocatalytic properties of the Ti0. 9925Co0. 0075O2 powders in a Rhodamine B aqua by UV-Vis spectrum（ UV-Vis）. The results indicated that the crystal structures of the as-prepared and the annealed Ti0. 9925Co0. 0075O2 powders were anatase phase. The annealed powders crystallized more perfectly and the grain size of the annealed powders was increased. The photocatalytic property of the as-prepared powders was better and that of the annealed powders was a little bad.