Biosorption of Cr(Ⅲ)from aqueous solution by freeze-dried activated sludge:Equilibrium,kinetic and thermodynamic studies
Biosorption of Cr(Ⅲ) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and thermodynamic studies作者机构：State Key Laboratory of Pollution Control and Resources ReuseCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China
出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)
年 卷 期：2010年第4卷第3期
页 面：286-294页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学]
基 金：the National Natural Science Foundation of China(Grant No.20807031) the National High-Tech Research and Development Programs of China(Grant No.2007AA061300) the International Cooperation Project of Science and Technology Commission of Shanghai Municipality(No.08230707000)
主 题：activated sludge biosorption chromium film diffusion kinetics thermodynamics
摘 要：Batch biosorption experiments were conducted to remove Cr(Ⅲ)from aqueous solutions using activated sludge from a sewage treatment *** investigation was conducted on the effects of the initial pH,contact time,temperature,and initial Cr(Ⅲ)concentration in the biosorption *** results revealed that the activated sludge exhibited the highest Cr(Ⅲ)uptake capacity(120 mg·g^(–1))at 45℃,initial pH of 4,and initial Cr(Ⅲ)concentration of 100 mg·L^(–1).The biosorption results obtained at various temperatures showed that the biosorption pattern accurately followed the Langmuir *** calculated thermodynamic parameters,ΔGo(–0.8––4.58 kJ·mol^(–1)),ΔHo(15.6–44.4 kJ·mol^(–1)),andΔSo(0.06–0.15 kJ·mol^(–1)·K^(–1))clearly indicated that the biosorption process was feasible,spontaneous,endothermic,and *** pseudo first-order and second-order kinetic models were adopted to describe the experimental data,which revealed that the Cr(Ⅲ)biosorption process conformed to the second-order rate expression and the biosorption rate constants decreased with increasing Cr(Ⅲ)*** analysis of the values of biosorption activation energy(Ea=–7 kJ·mol^(–1))and the intraparticle diffusion model demonstrated that Cr(Ⅲ)biosorption was film-diffusion-controlled.
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