摘要
用乙酸钠培养驯化了取自污水处理厂的活性污泥,采用NaOH提取法从活性污泥中提取了胞外聚合物(EPS)。用静态法研究了EPS对铀酰离子的吸附行为,探讨了温度、pH、反应时间、EPS投加量和离子强度等因素对铀酰离子吸附效果的影响,进行了吸附热力学、吸附动力学研究,对比了EPS吸附铀酰离子前后的红外谱图。结果表明:最佳吸附温度为25℃,最佳吸附时间为120min,EPS最佳投加量为300mg/L,离子强度对吸附影响较大;吸附热力学和动力学研究表明,吸附过程更符合Freundlich吸附模型和假二级反应动力学模型。
The activated sludge got from sewage treatment plant was cultivated by sodium acetate. Extracellular polymeric substances（EPS） were extracted through NaOH extraction method. The adsorption behavior of EPS on uranyl was studied by static method. The influences of temperature, pH, adsorption time, the dosage of the EPS and ionic strength on the effect of adsorption of uranyl were discussed. Thermodynamic and kinetic of adsorption were discussed, too. The infrared spectra of EPS before and after adsorbing uranyl were compared. The experimental results indicate that the best adsorption temperature is 25 ℃, the best adsorption time is 120 min, and the best dosage of EPS is 300 mg/L. The ionic concentration has a strongly impact on adsorption. The study of adsorption thermodynamics indicates that the adsorption process conforms to the Freundlieh adsorption model. The study of adsorption kinetics indicates that the adsorption process conforms to second order reaction kinetics model.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2014年第1期47-52,共6页
Journal of Nuclear and Radiochemistry
基金
国家自然科学基金资助项目(11375043)
江西省自然科学基金资助项目(20114BAB203020)
关键词
活性污泥
胞外聚合物
铀酰离子
吸附
activated sludge
extracellular polymeric substances
uranyl ion
adsorption
