【摘要】 以热灭活的植物乳杆菌为生物吸附剂,探讨了吸附U(VI)的影响,并采用扫描电镜-能谱、红外光谱等手段研究了U(VI)的吸附机理。结果表明,植物乳杆菌对U(VI)具有良好的吸附效果。在pH为6.0,温度30℃,灭活乳杆菌投加量为120 mg/L,初始U(VI)的质量浓度为10 mg/L时,植物乳杆菌对U(VI)的去除率可达94.28%,吸附平衡时间为4 h。吸附过程较好符合准2级动力学吸附模型和Freundlich模型。经过灭活的植物乳杆菌的菌体比表面积增加,能更好的吸附U(VI),配位络合是菌体吸附U(VI)的主要机理,参与吸附的官能团有细胞表面多糖与蛋白质羟基、蛋白质酰胺基、羧基与磷酸酯基等。此外菌体表面的静电作用也是吸附的方式之一。更多还原

【Abstract】 The heat-killed Lactobacillus plantarum was used as biosorbent to investigate the effects on U(VI) adsorption. The adsorption mechanism was investigated by SEM-EDS, FTIR and other methods. The results showed that Lactobacillus plantarum had a good adsorption effect on U(VI). When the pH was 6, the temperature was 30 ℃, the inactivated Lactobacillus dosage was 120 mg/L, and the initial mass concentration of U(VI) was 10 mg/L,the U(VI) adsorption efficiency of heat-killed Lactobacillus plantarum was up to 94.28% and balanced at 240 minutes. The adsorption process fit well with the pseudo-second-order kinetics adsorption model and the Freundlich model. The specific surface area of the inactivated Lactobacillus plantarum was increased and U(VI) could be adsorbed better. Coordination was the main mechanism of uranium adsorption by bacteria. The functional groups involved in adsorption include cell surface polysaccharides and protein hydroxyl groups, protein amide groups, carboxyl groups, and phosphate ester groups. In addition, the electrostatic effect on the surface of bacteria was one of the adsorption methods.更多还原