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以硝酸镨为掺杂的前驱物,钛酸异丙酯为TiO2的前驱物,通过炭黑吸附高温水热法制得掺杂镨的量为0.07%的纳米Pr3+/TiO2粉体。分别采用热重/差热分析(TG-DTA)、X射线衍射(XRD)、扫描电镜(SEM)、紫外可见分析(UV-VIS)和比表面积吸附(BET)对不同焙烧温度下所得粉体的物相、颗粒度、分散性及光吸收性能进行表征和分析。实验结果表明:炭黑的吸附阻止了粉体在干燥和煅烧阶段的团聚和烧结,制得的Pr3+/TiO2纳米粉体团聚较少,呈现良好的分散性,颗粒均匀,经500℃焙烧,得到纳米粉体平均颗粒直径为18 nm,比表面积为78.08 g.m-2。光催化降解实验表明,炭黑吸附后TiO2的光催化活性在一定时间内比没有炭黑的提高了将近2倍,在紫外灯照射下Pr3+/TiO2能在60 min内对亚甲基蓝的降解率达到93%。
Praseodymium nitrate doped precursor and isopropyl titanate were precursors of TiO2. Pr3 + / TiO2 powder doped with 0.07% praseodymium was prepared by high temperature hydrothermal method. The powders obtained at different calcination temperatures were characterized by TG-DTA, XRD, SEM, UV-VIS and BET. The phase, particle size, dispersibility and light absorption properties were characterized and analyzed. The experimental results show that the adsorption of carbon black prevents the agglomeration and sintering of the powders during the drying and calcination stages. The prepared Pr3 + / TiO2 nano-powders have less agglomeration and exhibit good dispersibility. The particles are uniformly calcined at 500 ℃ The average particle diameter of nano-powder was 18 nm and the specific surface area was 78.08 gm-2. Photocatalytic degradation experiments showed that photocatalytic activity of TiO2 after TiO2 adsorption increased by nearly 2 times than that without carbon black in a certain period of time, and the degradation rate of methylene blue in Pr3 + / TiO2 can reach 93 %.