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以钛酸丁酯、硝酸镧和氟化钠为原料,采用溶胶-凝胶法对TiO2进行La及F共掺杂改性,以光催化降解亚甲基蓝为探针,考察掺杂组分对催化剂紫外光活性的影响。采用X射线衍射(XRD)、低温氮气吸附(BET)、紫外-可见漫反射(UV-Vis)和荧光光谱分析(PL)等手段对催化剂的晶体结构、比表面积、带隙能及催化剂中电子-空穴对的复合性能等进行表征,尝试揭示掺杂组分对光催化活性影响的机制。结果表明,掺杂改性催化剂中,适量La和F组分的作用在于通过抑制催化剂的晶粒长大、减少团聚,同时降低带隙能且降低光生电子和空穴的复合几率,来提高催化剂的光催化活性。
Titanium tetrabutyl titanate, lanthanum nitrate and sodium fluoride were used as raw materials. The TiO2 films were modified by La and F co-doping by sol-gel method. The photocatalytic degradation of methylene blue Effect of light activity. The crystal structure, specific surface area, bandgap energy and electron-endurance of the catalyst in the catalyst were characterized by X-ray diffraction (XRD), low temperature nitrogen adsorption (BET), UV-Vis and fluorescence spectroscopy (PL) - hole pairs of the composite properties were characterized in an attempt to reveal the mechanism of doping components on the photocatalytic activity. The results show that the proper amount of La and F components in the doping modified catalyst is to increase the catalyst by inhibiting the grain growth of the catalyst, reducing agglomeration, reducing the bandgap energy and reducing recombination probability of photogenerated electron and hole Photocatalytic activity.