摘要
研究啤酒酵母对溶液中铬(Ⅵ)的吸附效果和机理,通过红外对吸附前后菌体表面特征分析,表明Cr(Ⅵ)与菌体表面基团发生配位络合反应。结果表明,在温度为35℃,pH=2,Cr(Ⅵ)初始浓度为20 mg/L时达到最大吸附量,最大吸附量为4.19 mg/g。酵母菌对Cr(Ⅵ)的吸附行为基本符合Langmuir方程,并且在25,30和35℃条件下的理论最大吸附量qmax分别为4.472,4.533,4.702 mg/g。动力学研究表明,反应在240 min吸附基本达到平衡状态,准二级动力学模型能够更好的描述吸附过程。不同温度下的吸附热力学显示,该吸附过程为自发的吸热反应。
Biosorption of chromium ion [ Cr （VI） ] by using dead biomass of saccharomyces cerevisiae （S. cerevisiate） was investigated in this article. Fourier transform infrared （FTIR） spectroscopy indicated that Cr （VI） and the function groups on S. cerevisiae have the coordinate complex reaction. The experi- mental results showed that： the optimum biosorption can be reached under the conditions of T = 35 ℃, pH = 2,Cr =20 mg/L and the maximum adsorption capacity was 4.19 mg/g. The experimental data were based on Langmuir biosorption isotherm model basically and the maximum biosorption capacities were 4.472,4. 533 and 4. 702 mg/g at 25,30 and 35 ~C ,respectively. The kinetic investigation indicated that the reaction basically reached equilibrium in the 240 min and found that pseudo-second-order rate kinetic model showed the better correlation. The thermodynamic constants at different temperature showed that the biosorption process is spontaneous and endothermic.
出处
《应用化工》
CAS
CSCD
2010年第4期532-537,共6页
Applied Chemical Industry
基金
河海大学校级自然科学基金(2009425711)
