壳聚糖吸附酸性品红的平衡及动力学研究  

Study on equilibrium and kinetics on adsorption of acid fuchsin onto chitosan

作　　者：贾海红[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8期1800-1804,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)

摘　　要：研究了pH值、时间及温度对壳聚糖吸附酸性品红的影响。结果表明,pH值是影响壳聚糖吸附酸性品红的重要因素;其动力学行为更好地符合Lagergren准二级反应动力学模型,随着温度的升高,平衡吸附量减少。吸附过程的表观活化能(Ea)为2.90 kJ/mol。壳聚糖对酸性品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-15.10 kJ/mol(303 K)、-11.12 kJ/mol和17.30 J/(mol.K),表明壳聚糖对酸性品红的吸附是一个自发的放热过程。红外光谱分析得到,壳聚糖吸附酸性品红的过程中,壳聚糖分子中存在的大量羟基和氨基发挥了主要作用。The adsorption of acid fuchsin onto chitosan was strongly dependent on pH of the medium.The kinetics of the interactions showed better agreement with the Lagergren second order kinetics,and indicated that the initial sorption rate and capacity decreased with increasing temperature.The activation energy of biosorption（Ea） was determined to be 2.90 kJ/mol using Arrhenius equation.The adsorption data showed a good fit with Freundlich isotherm.Thermodynamic parameters,such as ΔGo、ΔHo and ΔSo were found as-15.10 kJ/mol（303 K）、-11.12 kJ/mol and 17.30 J/（mol·K）,respectively.The results indicated that the adsorption of acid fuchsin onto chitosan was spontaneous and exothermic.The FTIR data showed that some functional groups mainly including —OH and —NH2 in chitosan were responsible for the adsorption of acid fuchsin.

关 键 词：酸性品红 壳聚糖 吸附 动力学 平衡 

分 类 号：X703[环境科学与工程—环境工程]