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采用无皂乳液聚合合成的聚苯乙烯(PS)微球为模板、氨水/三乙醇胺为催化体系,通过溶胶-凝胶方法合成了PS/TiO2(核/壳)复合微球,然后通过煅烧制备了N掺杂、锐钛型空心TiO2微球.在反应体系中三乙醇胺扮演双重角色,既是TiO2生成及包覆过程的抑制剂又是空心TiO2微球的N掺杂剂.改变氨水、三乙醇胺和钛酸正丁酯用量可控制TiO2壳的形态和尺寸.氨水用量增加,PS/TiO2复合微球的壳表面变得粗糙;三乙醇胺用量增加,壳表面变得光滑;钛酸正丁酯用量提高导致壳层变厚.改变三乙醇胺用量可调节空心TiO2微球中的N掺杂量;N掺杂空心TiO2微球具有可见光响应和光催化作用.
PS / TiO2 (core / shell) composite microspheres were synthesized by sol-gel method using polystyrene (PS) microspheres synthesized by soap-free emulsion polymerization as template and ammonia / triethanolamine as catalyst system N-doped, anatase hollow TiO2 microspheres in the reaction system triethanolamine play a dual role, both as a catalyst for the formation and coating of TiO2 hollow Nano-TiO2 microspheres N dopant to change the ammonia, triethanolamine And the amount of n-butyl titanate can control the morphology and size of the TiO2 shell.The amount of ammonia water increases, the shell surface of the PS / TiO2 composite microspheres becomes rough, the amount of triethanolamine increases, the surface of the shell becomes smooth, the amount of n-butyl titanate The thickness of the shell increases due to the increase of triethanolamine dosage.N-doped hollow TiO2 microspheres have visible light response and photocatalytic activity.