论文部分内容阅读
用FTIR、XPS、TEM等表征方法对溶液中大肠杆菌吸附钯(Ⅱ)的机理行了研究。结果表明,该吸附过程与大肠杆菌和钯(Ⅱ)间静电作用有关,在pH为2.0时吸附量最大,可达120.08 mg/g;对大肠杆菌进行化学修饰,FTIR结果表明细胞表面的氨基、羧基可能为吸附钯(Ⅱ)的主要基团,涉及到表面络合机制;TEM及XPS结果显示吸附6 h后菌体内有尺寸为5~15 nm的钯纳米颗粒生成,说明该吸附过程还存在还原反应。大肠杆菌对钯(Ⅱ)的吸附过程是静电作用、表面络合、氧化还原等机制共同作用的结果。
The mechanism of adsorption of palladium (Ⅱ) on Escherichia coli in solution was studied by FTIR, XPS and TEM. The results showed that the adsorption process was related to the electrostatic interaction between E. coli and palladium (Ⅱ), and the maximum adsorption was 120.08 mg / g at pH 2.0. The chemical modification of E. coli showed that the amino groups, The carboxyl group may be the main group for the adsorption of palladium (II), which involved the surface complexation mechanism. The TEM and XPS results showed that the adsorption of Pd (II) Reduction reaction. Escherichia coli palladium (Ⅱ) adsorption process is electrostatic interaction, surface complexation, redox mechanism of the combined effect of the results.