(成都信息工程學(xué)院 資源環(huán)境學(xué)院，成都 610225)
摘 要: 研究抗鉛產(chǎn)絮菌株B-07胞外聚合物EPS-07作為吸附劑處理含Pb(Ⅱ)的廢水的吸附性能。結(jié)果表明：當(dāng)吸附時間為80 min，pH為5.5，吸附劑用量為0.8 g/L，溶液中Pb(Ⅱ)初始濃度為50 mg/L時，EPS-07對鉛離子的吸附平衡容量為61.5 mg/g。吸附等溫式能較好地用Langmuir模型表達(dá)，吸附動力學(xué)很好地符合準(zhǔn)二級動力學(xué)模型。FT-IR結(jié)果表明，EPS-07與Pb(Ⅱ)的作用過程中，主要是羥基、羧基等基團(tuán)參與了吸附作用。SEM觀察顯示EPS-07表面結(jié)構(gòu)比較松散，EPS-07與Pb(Ⅱ)作用后, 其表面變得致密并有結(jié)晶沉淀物出現(xiàn)。EDS圖出現(xiàn)了Pb元素峰，表明 Pb(Ⅱ)被吸附到EPS-07上面。
關(guān)鍵字: 生物吸附；克雷伯氏菌；胞外聚合物；Pb(Ⅱ)
（College of Resource and Environment, Chengdu University of Information Technology, Chengdu 610225, China）
Abstract: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 min, 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.
Key words: biosorption; Klebsiella pneumonia; extracellular polymeric substance; Pb(Ⅱ)
