【摘要】 采用深海中温菌Wangia profunda(SM-A87)的胞外多糖对对硝基苯胺进行吸附试验。分别用热分析仪、FTIR和Zeta电位仪对胞外多糖进行表征分析,并研究了吸附时间、胞外多糖用量、pH和温度等方面对其吸附规律的影响。结果表明:胞外多糖可有效去除水中的对硝基苯胺。20℃时,0.1 g/L的SM-A87胞外多糖吸附处理50 mL初始浓度为15 mg/L的对硝基苯胺水样120 min后,对硝基苯胺的最大吸附率可达91%;Langmuir、Freundlich、Redlich-Peterson等温方程和准二级动力学方程均能较好地描述SM-A87胞外多糖吸附对硝基苯胺的热力学及动力学过程,由Langmuir方程得到SM-A87胞外多糖对对硝基苯胺的最大吸附量为769.2 mg/g(30℃)。更多还原

【Abstract】 Biosorption of p-nitroaniline by exopolysaccharide(EPS) from the deep-sea mesophilic bacterium Wangia profunda(SM-A87) was studied.The SM-A87 EPS was characterized by DSC/TGA,FTIR and Zeta potential.The influence of contact time,SM-A87 EPS dosage,pH and temperature were investigated by batch adsorption experiments.The results showed that SM-A87 EPS was particularly effective at removal of p-nitroaniline from aqueous solution.The adsorption ratio of p-nitroaniline could reach 91%,under the condition of 20 ℃,p-nitroaniline concentration of 15 mg/L,EPS dosage of 0.1 g/L and equilibrium time of 120 min. The equilibrium data at different temperatures fitted all the Langmuir,Freundlich and Redlich-Peterson models well.The maximum adsorption capacity of p-nitroaniline was calculated to be 769.2 mg/g(30 ℃) according to the Langmuir model.Compared with the pseudo-first-order kinetic model,the biosorption kinetics for p-nitroaniline can be well described by the pseudo-second-order kinetic model.更多还原