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。
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.
作者
刘金香
蒲亚帅
谢水波
刘迎九
陈子庚
李仕友
LIU Jinxiang;PU Yashuai;XIE Shuibo;LIU Yingjiu;Chen Zigeng;LI Shiyou(School of Civil Engineering,University of South China,Hengyang 421001,China;Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology,University of South China,Hengyang 421001,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2019年第2期61-66,共6页
Technology of Water Treatment
基金
国家自然科学基金(11475080)
南华大学博士科研启动基金项目(2016XQD06)
关键词
植物乳杆菌
U(VI)吸附
机理
Lactobacillus plantarum
U(VI)
adsorption
mechanism
