酸处理青霉菌对活性艳红X-3B的吸附动力学和热力学研究  

Kinetic and thermodynamic study on the biosorption of Reactive Red X-3B from aqueous solution by acid-treated mycelia of Penicilium sp.

作　　者：张丽芳[1] 魏德洲[1] 

机构地区：[1]东北大学资源土木学院

出　　处：《安全与环境学报》2008年第1期21-25,共5页Journal of Safety and Environment

基　　金：国家自然科学基金资助项目(50174014);辽宁省自然科学基金资助项目(20042021)

摘　　要：采用青霉菌菌体作为吸附剂对染料活性艳红X-3B进行吸附研究,考察了染料的初始质量浓度、pH值和温度对菌体吸附能力的影响,并探讨了吸附动力学和热力学特性。结果表明,经硝酸处理后的菌体吸附能力明显增强,在pH值为3时,吸附量达到最大。吸附过程可用准二级动力学方程来表达,平衡时吸附量的计算值和实验值吻合很好,相关系数可达0.9998。硝酸处理的菌体对活性艳红的吸附等温线可用Langmuir方程表达。当温度为25℃、30℃、35℃、40℃时,饱和吸附量分别为250.0mg/g、322.6mg/g、400mg/g、416.7mg/g。温度升高,吸附量增大,表明该吸附反应是吸热反应。根据热力学函数关系计算出ΔH=35.13kJ/mol,ΔS=125.17J/(mol.K),ΔG为-2.13～-4.03kJ/mol,表明菌体对活性艳红的吸附是自发过程。The present paper is about the authors＇ investigation into the biosorption of the Reactive Red X-3B gained from an aqueous solution by Penicilium sp. in a batch system. In our work, we have investigated the effects of the initial concentration of the dye, pH value as well as the temperatures on biosorption of Reactive Red X-3B along with our definition of the adsorption isotherms and their dynamic features. As the result of our testing and investigation, we have found that the nitric-treated fungal biomass is beneficial for empowering dye＇s adsorption capacity as compared with the native mycelia. At different initial Reactive Red X-3B concentrations （50-500 mg/L）, the equilibrium uptake capacity of nitric-treated fungal mycelia has been found to increase significantly with the increase of the dye＇ s initial concentration. Moreover, the adsorbed Reactive Red X-3B amounts have also heen discovered to decrease with the increase of the initial pH value of the system. The maximum dye uptake capacity with the fungal biomass preparations was observed at pH 3.0, with the reactive red being easily eluted by 0.1 mol/L NaOH solution and its elution efficiency being able to rise high up to 95 % . What is more, we have also studied the three cycles of biosorption-elutionbiosorption for the biomass. The fast adsorption rate is expected to get to with its dye-adsorption efficiency up to 85 % during the first 10 rain at room temperature, which is generally considered practical for industrial use. Besides, the so-called pseudo second-order model is also regarded as the best description for the reaction rate, adsorption capacity as well as the correlation coefficient （known as 0.999 8） . In addition, the Langmuir and Freundlich models have also been used to describe the isotherm data. According to the Langmuir model, the maximum reactive Ied uptake at the temperature of 25 ℃ , 30 ℃ , 35℃ and 40 ℃ can be expected to reach 250.0 mg/g, 322.6 mg/g, 400 mg/g and 416.7 mg/g, respectively. Furthermore, we have also

关 键 词：环境生物学 青霉菌 生物吸附 活性艳红X-3B 吸附热力学 

分 类 号：X172[环境科学与工程—环境科学]