Wang Zi-Qiang, Liu Shou-Xin
College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Huan Jing Ke Xue. 2010 Sep;31(9):2129-33.
Activated carbon-silver composite (Ag/AC) for antibacterial behavior with capability of controlling silver release was prepared by NaBH4 reduction method. The antibacterial activity towards E. coil and resistance of water erosion was investigated through a point of view of water purification. N2 adsorption isotherm, Scanning electron spectroscopy (SEM)-Energy dispersive X-ray spectrometer(EDS) and X-ray diffraction(XRD) was used to characterize the surface morphology and pore properties. As an experiment result, silver was deposited on AC in the state of Ag0. The content of silver supported, specific surface area, nucleus formation and growth mechanism, particle size and distribution of the generated silver particles were determined by the concentration of the aqueous solution of AgNO3. With the increasing of AgNO3 solution concentration, the activity of the obtained Ag/AC changed from non-active to inhibitory and then to high antibacterial. Ag/AC supported silver content of 2.70% killed all the concentration of 2 x 10(6) CFU/mL of E. coil. However, it showed high resistance to water erosion that silver loss was 21.1% in 600 h for surging. High antibacterial activity and control silver release can be simultaneously realized by the NaBH4 reduction method.
采用硼氢化钠还原法制备了具有控制银释放能力的活性炭-银复合材料（Ag/AC），从水净化的角度研究了其对大肠杆菌的抗菌活性和耐水蚀性。利用N2吸附等温线、扫描电子显微镜（SEM）-能谱仪（EDS）和X射线衍射（XRD）对其表面形貌和孔隙特性进行了表征。实验结果表明，银以Ag0的状态沉积在活性炭上。通过硝酸银水溶液的浓度确定了负载银的含量、比表面积、成核和生长机理、生成银颗粒的粒径及分布。随着硝酸银溶液浓度的增加，所得Ag/AC的活性从无活性变为抑制性，然后变为高抗菌性。负载银含量为2.70%的Ag/AC能杀灭所有浓度为2×10(6) CFU/mL的大肠杆菌。然而，它表现出很高的耐水蚀性，在600 h的浸泡中银损失率为21.1%。通过硼氢化钠还原法可以同时实现高抗菌活性和控制银释放。
