摘要
利用TG—DTA、XRD和XPS等技术研究了Ag同步掺杂与沉积TiO2:纳米粉的相变。样品是在避光条件下采用溶胶-凝胶法制备的。分析结果表明,在较低掺杂浓度区(Ag/Ti atom<3％)以Ag+的迁移、扩散为主,存在-扩散阈值(Ag/Ti atom=3％～5％),在较高浓度掺杂区(Ag/Tiatom≥3％)Ag+的迁移、扩散和表面还原共存。高浓度Ag掺杂降低了TiO2的比表面,抑制了TiO2的晶化,促进了TiO2由锐钛矿相向金红石相的转变,使相变温度显著降低。
The anatase-rutile phase transformation of simultaneously doped and deposited Ag-TiO2 powder was studied by TG-DTA, XRD and XPS. Catalysts were prepared by the sol-gel method. Through characterizations, it was found that in rather low doping concentration areas(Ag/Ti atom<3%) there are mainly migration and diffusion of Ag+ ions, and the diffusion threshold value (Ag/Ti atom=3%-5%) exist, in rather high doping concentration areas(Ag/Ti atom≥3%) migration and diffusion of Ag+ ions coexist with surface reductions. The dopant of Ag decreases specific surface areas of TiO2 powder and promotes the phase transformation but has a depression effect on the anatase grain growth.
出处
《黑龙江大学自然科学学报》
CAS
2004年第1期100-103,共4页
Journal of Natural Science of Heilongjiang University
基金
国家自然科学基金资助项目(20171016.20301006)
教育部重点项目计划(02051)
黑龙江省自然科学基金资助项目(B0305)
黑龙江省青年科学基金资助项目(2002)
黑龙江省科学技术计划资助项目(WB02103)
黑龙江大学青年基金资助项目(Q200243)
关键词
TIO2
银
同步沉积与掺杂
相变
TiO2
Ag
simultaneously doped and deposited
phase transformation
