可见光响应杀菌功能活性炭的制备及表征

Preparation and Characterization of Visible-Light Response Activated Carbon with Antibacterial Behavior

以TiCl4为钛源,采用酸催化水解法在椰壳炭表面合成TiO2前驱体,在NH3/N2气氛中程序升温处理制得可见光响应杀菌功能活性炭(TiN/GAC).以大肠杆菌(E.coli)为实验菌种,考察了功能活性炭在可见光下的杀菌活性.采用X射线衍射(XRD)、扫描电镜(SEM)、傅立叶变换红外光谱(FTIR)及低温液氮物理吸附对杀菌功能活性炭进行晶相结构、表面形貌、光谱特征和孔结构进行表征.结果表明,负载活性炭对TiO2的晶相结构没有影响,负载TiO2的晶粒尺寸为9.8 nm.载体的非晶相层和强吸附力能够抑制TiO2晶粒增长,二者以Ti—O—C键牢固结合,使TiO2在活性炭表面形成致密的膜层.经500℃煅烧5h的样品对E.coli的杀菌率最高,4 h后杀菌率可达67%,效果优于相同条件下自然光杀菌率(39%).

A visible-light response activated carbon with antibacterial activity was prepared by calcinations of the mixture of TiO2 precursor obtained by acid catalyzed hydrolysis method and commercial granular activated carbon（GAC） in NH3/N2 atmosphere. The antibacterial activity of the prepared activated carbon towards E. coil was investigated under the visible-light irradiation. X-ray diffraction （XRD）, Scanning electron spectroscopy（SEM） , Fourier transform infrared spectroscopy（FTIR） and N2 adsorption analyser were used to characterize the crystal phase structure, surface morphology, spectral characteristics and pore properties. The results show there is no influence for crystal phase structure of TiO2 supported AC. The crystal size of TiO2 is 9.8 nm. Non-crystal phase layer and strong adsorption force of carrier can inhibit the grain growth of TiO2 , and AC combines with TiO2 in Ti--O--C so that TiOzformestight film on AC. The sample calcinated at 500℃ for 5 h exhibites the highest bactericidal performance, and the bactericidal rate reached up to 67% after 4 h irradiation, which was better than that of nature light（39% ） in the same condition.