Effect of thermal treating temperature on characteristics of silver-doped titania

• Published in: Transactions of Nonferrous Metals Society of China Vol. 18; no. 4; pp. 980 - 985
• Main Author: 柴立元 韦顺文 彭兵 李竹英
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2008; School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China%Yiwu Bureau of Quality and Technical Supervision, Yiwu 322000, China
• Subjects: antibacterial material; silver ion; titanium dioxide; 二氧化钛; 抗菌材料; 热处理温度; 银离子掺杂; antibacterial material; silver ion; titanium dioxide
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60169-7

The silver-doped titania antibacterial agent was synthesized by mixing silver nitrate and the precursor of titania. Effects of thermal treatment on the properties of the silver-doped titania powders were investigated by thermal gravimeter/differential thermal analyzer（TG/DTA）, scanning electron microscope（SEM）, and X-ray diffractometer（XRD）, respectively. The results show that the anatase phase forms in titania when the powder is calcined at 400℃. With the increase of the calcination temperature from 400 to 700℃ , the grains of titania agglomerate and the particle size increases from 14 to 23 nm, and the specific surface area decreases from 63 to 38m^2g. As the powder is calcined at 700℃, titania starts to transform from anatase to futile phase. The release rate of silver ion of powder treated at the relatively low temperature is larger than that of powder treated at the relatively high temperature. The antibacterial tests show that the antibacterial activity of silver-doped titania powders is excellent against E.coli and S. aureus, and the antibacterial activity of powders weakens with the increase of the calcination temperature.