影响纳米锌铝复合氧化物紫外吸收性能的因素

在自制全返混液膜反应器中,采用共沉淀法,制备了粒径为30～90 nm的纳米锌铝复合氧化物.研究了Zn/Al摩尔比、锌铝复合氧化物前体的晶体结构完整性、煅烧温度及升温速率对锌铝复合氧化物紫外吸收性能的影响.结果表明,锌铝复合氧化物紫外吸收性能与其晶体结构密切相关.Zn/Al摩尔比提高、锌铝复合氧化物前体的晶体结构完整有利于增强紫外吸收性能;煅烧温度在400～600 ℃范围时,随着煅烧温度的升高锌铝复合氧化物紫外吸收性能增强,而在700～900 ℃范围时,煅烧温度升高紫外吸收性能降低;升温速率变化对锌铝复合氧化物紫外吸收性能影响不明显.

Factors effecting UV absorbing property of nano-sized Zn-Al composite oxides

Nano-sized Zn－Al composite oxides were synthesized by a coprecipitation method in a special device.The particle size of products was between 30 and 90 nm. The effects of Zn/ Al mole ratio ,the structure of Zn－Al composite oxides before calcination , calcination temperature and the heating rates on UV absorbing properties were investigated. It is found that Zn－Al composite oxides are very effective in absorbing ult raviolet radiation and this property is closely connected with the crystal structure of Zn－Al composite oxides. The result s show that higher Zn/ Al mole ratio and higher crystallinity of Zn－Al composite oxides before calcination are advantageous to UV absorbing characteristics. From 400 ℃to 600 ℃, Zn－Al composite oxides become more and more effective in absorbing ult raviolet with the increasing calcination temperature. However , it get s worse with the increasing calcination temperature between 700 ℃and 900 ℃. It seems that the heating rates during calcination is a less important factor to influence it s absorbing ult raviolet .