甲基红在壳聚糖上吸附富集的研究  

Research on adsorption enrichment of methyl red on chitosan

作　　者：贾海红[1] 徐祥华[1] 马龙生[1] 王学松[1] 韩宝平[2] 

机构地区：[1]淮海工学院化学工程学院,连云港222005 [2]徐州工程学院,徐州221008

出　　处：《环境工程学报》2011年第12期2768-2772,共5页Chinese Journal of Environmental Engineering

基　　金：江苏省高校自然科学基础研究基金(07KJB610005);淮海工学院自然科学基金(Z2009020);江苏省高等学校大学生实践创新训练计划项目

摘　　要：研究了pH、初始浓度、时间及温度对甲基红在壳聚糖上吸附富集的影响。结果表明,pH是影响甲基红吸附富集的重要因素,最佳pH 3.4。其动力学行为更好地符合Lagergren准二级反应动力学模型,随着温度增加,平衡吸附量减少。吸附过程的表观活化能(Ea)为7.518 kJ/mol。壳聚糖对甲基红的吸附过程较好地符合Freundlich吸附等温方程。计算得到吸附过程的热力学参数ΔGo、ΔHo和ΔSo分别为-24.88 kJ/mol(303 K)、-22.15 kJ/mol和8.783 J/(mol.K),表明壳聚糖对甲基红的吸附是一个自发的放热过程。红外光谱分析得到,壳聚糖吸附甲基红的过程中,壳聚糖分子中存在的大量羟基和氨基发挥了主要作用。The effects of pH, initial concentration, contact time and temperature on the adsorption enrichment of methyl red on chitosan were studied. The results showed that the pH of the medium was the major factor, and the optimal pH was 3.4. The behavior kinetics of the adsorption was well agreement with the Lagergren quasi-second order kinetics model, and the equilibrium absorption capacities decreased with increasing temperature. The activation energy （Ea） of biosorption was determined to be 7. 518 kJ/mol. The adsorption data showed a good fit with Fredulich isothermal equation. Thermodynamic parameters, △G0、△H0 and △S0 were calculated as -24.88 kJ/mol（303 K） , -22.15 kJ/mol and 8. 783 J/（mol· K）, respectively. The results indicated that the adsorption enrichment of methyl red in ehitosan was a spontaneous and exothermic process. The FTIR data showed that some functional groups mainly including --OH and --NH2 in chitosan were responsible for the ad- sorption enrichment of methyl red.

关 键 词：甲基红 壳聚糖 吸附富集 动力学 热力学 

分 类 号：X703[环境科学与工程—环境工程]