TiO_2纳米复合抗菌剂粉体的制备及耐热性

PREPARATION AND HEAT-RESISTANT PROPERTIES OF TiO_2 NANO-COMPOSITE ANTIMICROBIAL POWDER

以TiCl4,Al2(SO4)3为原料,采用液相共沉淀法制备了TiO2纳米复合抗菌剂,并对其耐热性能及抗菌性能进行了研究,同时对其复合结构进行了初步分析。结果表明:复合Al2O3后的TiO2纳米抗菌剂在900℃煅烧后完全为锐钛矿;950℃煅烧后为锐钛矿(相对质量含量为77%)占主要含量的混晶结构,平均粒径为20～30nm。在950℃时,其紫外-可见光吸收特性较纯纳米TiO2在700℃有较大提高,且抗菌效果优于纯TiO2纳米抗菌剂的。Al2O3在TiO2表面形成的均匀包覆和键合约束机制是抑制纳米TiO2晶型转化和晶粒生长原因。

TiO2 nano-composite antimicrobial powder was prepared by the co-precipitation method using TiCl4 and Al2（SO4）3 as raw materials. The heat-resistance and antimicrobial properties of the TiO2 nano-composite antimicrobial powder were studied, and the basic of the composite was analyzed. The results show that the crystalline structure of TiO2 nano-eomposite antimicrobial powder is only anatase after gale＇marion at 900 ℃. A mixed crystalline structure with 77% in mass anatase is formed at 950 ℃, with an average particle size of about 20-30nm. The nano-composite anfimicrobial powder after calcination at 950 ℃ has superior absorbance in the ultra-visible region than that in the. pure TiO2 nano-antimicrobial film after calcination at 700 ℃. The uniform surface absorption and bond restriction mechanism of the Al2O3 composite agent are reasons to delay the phase transition process and particle growth of TiO2 nanocrystals.