摘要
研究抗铅产絮菌株B-07胞外聚合物EPS-07作为吸附剂处理含Pb(Ⅱ)的废水的吸附性能。结果表明:当吸附时间为80 min,pH为5.5,吸附剂用量为0.8 g/L,溶液中Pb(Ⅱ)初始浓度为50 mg/L时,EPS-07对铅离子的吸附平衡容量为61.5 mg/g。吸附等温式能较好地用Langmuir模型表达,吸附动力学很好地符合准二级动力学模型。FT-IR结果表明,EPS-07与Pb(Ⅱ)的作用过程中,主要是羟基、羧基等基团参与了吸附作用。SEM观察显示EPS-07表面结构比较松散,EPS-07与Pb(Ⅱ)作用后,其表面变得致密并有结晶沉淀物出现。EDS图出现了Pb元素峰,表明Pb(Ⅱ)被吸附到EPS-07上面。
The biosorption characteristics of extracellular polymeric substance （EPS-07） of producing flocculant strain B-07 as lead-resistant for the removal of Pb（Ⅱ） from aqueous solution were studied. The results show that the extent of adsorption capacity is 61.5 mg/g when the dosage of EPS-07 is 0.8 g/L, pH=5.5, adsorption contact time is 80 rain, initial Pb（Ⅱ） concentration of aqueous solution is 50 mg/L, respectively. The biosorption equilibrium data are better described by Langmuir isotherm model, and the adsorption reaction of Pb（Ⅱ） by EPS-07 follows the second-order kinetic model. The carboxy, hydroxyl groups of EPS-07 are involved in chemical interaction with the Pb（Ⅱ） ions depicted by Fourier transform infrared spectroscopic （FT-IR） results. Moreover, SEM observation indicates that the EPS-07 surface is loose, and then obviously changes to campact after the EPS-07 surface loaded with with Pb（Ⅱ）, where cry stalline deposits are deposited on the EPS-07 surface. Also, biosorption of Pb（ Ⅱ） is confirmed by EDS analysis, which reveales the presence of Pb（Ⅱ） signals on the EPS-07 surface.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第9期2667-2675,共9页
The Chinese Journal of Nonferrous Metals
基金
生物地质与环境地质国家重点实验室(BGEG1009)
四川省教育厅青年基金资助项目(08zb057)
