论文部分内容阅读
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%).
TiCl4 was used as titanium source to synthesize TiO2 precursors on coconut shell charcoal by acid catalyzed hydrolysis and the visible light-responsive bactericidal functional activated carbon (TiN / GAC) was prepared by heating in NH3 / N2 atmosphere.The E.coli ) As fungi, the bactericidal activity of functional activated carbon under visible light was investigated.The X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and low temperature liquid nitrogen physical adsorption Phase structure, surface morphology, spectral characteristics and pore structure were characterized.The results show that the activated carbon has no effect on the crystal structure of TiO2, and the grain size of TiO2 is 9.8 nm.The amorphous phase and strong adsorption capacity of the support can The inhibition of TiO2 grain growth, the two Ti-O-C bond firmly bonded to TiO2 in the activated carbon surface to form a dense film.The sample calcined at 500 ℃ 5h E. coli sterilization rate was highest after 4 h sterilization rate Up to 67%, the effect is better than the same conditions, the natural light sterilization rate (39%).