Ti(IV)与铜离子共掺杂的羟基磷灰石薄膜弱紫外光杀菌研究

采用共沉淀水热合成和离子交换的方法,制备了钛与铜离子共掺杂的羟基磷灰石(Ca10(PO4)6(OH)2:HAP)(HAPTiCu),以大肠杆菌为目标物,研究了不同材料负载的多孔镍网薄膜在弱紫外光下的杀菌活性.结果表明,HAPTiCu在弱紫外光下具有高效杀菌效率,并远远高于HAPTi和P25 TiO2薄膜.这主要是铜离子的抗菌与光催化分解细菌的协同作用的结果.电子自旋共振(ESR)研究表明杀菌反应的主要活性物种是O2-.HAPTiCu薄膜释放的铜离子在光催化杀菌反应过程中,被光催化还原沉积在表面,导致了较低的铜离子溶出,从而保证了材料的稳定性.

Killing bacteria of titanium(IV) and copper co-doped hydroxyapatite film under weak UV light

Hydroxyapatite (Ca10(PO4) 6(OH) 2: HAP) particles co-doped with Ti(IV) and Cu2+(HAPTiCu), by a coprecipitation and ion-exchange methods. The Gram-negative Escherichia coli was selected the model to evaluate the bactericidal killing activity of different films on porous spumous nickel under weak UV light. The results indicated that HAPTiCu had very highly efficiency bactericidal activity and much higher than that of HAPTi and P25 TiO2 under weak UV light. This was contributed to the synergy of the Ti(IV) photocatalytic decomposition activity and the Cu2+ antibacterial activity in the structure of HAPTiCu. ESR studies indicated that O-2 reactive species were invoved in the reaction. Most of the released Cu2+ from HAPTiCu films were deposited on the surface of HAPTiCu during photocatalytic killing bacteria process, only fewer remained in the reaction solution, keeping the stability of the material.