溶液化学特性对果聚糖在聚偏氟乙烯膜上吸附的影响  

Effect of Solution Chemistry Conditions on Levan Adsorption onto Polyvinylidene Fluoride Membrane

作　　者：徐绘霞[1] 李秀芬[1] 陈坚[2] 堵国成[3] 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]江南大学食品科学与技术国家重点实验室,江苏无锡214122 [3]江南大学生物工程学院,江苏无锡214122

出　　处：《食品与生物技术学报》2009年第3期305-309,共5页Journal of Food Science and Biotechnology

基　　金：国家973计划项目(2007CB714036);国家自然科学基金项目(50678073);江苏省太湖水专项项目(BS2007125)

摘　　要：活性污泥体系中存在产生果聚糖的诸多微生物,研究其在膜表面的吸附行为有利于控制膜生物反应器中的膜污染。结果表明,果聚糖在聚偏氟乙烯膜上的吸附可在60 min内达平衡。随溶液pH值的增大,果聚糖吸附量先降低后增加,在pH=7.0处取得最小值,为20 mg/m2。而吸附量随离子强度的变化趋势则是先增加后降低,在离子强度为0.004处取得最大值,为39 mg/m2。果聚糖在聚偏氟乙烯膜表面的吸附等温线遵循兰格缪尔方程,并给出了不同溶液化学条件的吸附自由能。果聚糖与聚偏氟乙烯膜之间的吸附可能受静电力和范德华力的共同作用,且吸附是可逆的。The aim of this study was to control membrane fouling through elucidating the behaviors of levan adsorption onto Polyvinylidene Fluoride （PVDF） membrane in membrane bioreactor. It was found that： （1） the Levan adsorption on PVDF membrane reached a balance at 60 min; （2） At the range of pH 7.0, the adsorbed amount was decreased with increasing of pH （20 mg/m^2 at pH 7.0） then continuous increased; （3） the adsorbed amount was increased to 39 mg/m^2 when the ionic strength increased to 0. 004, then reversed; （4） the adsorption isotherms followed Langmuir laws; （5） The equation parameters and adsorption free energy were obtained at different solution chemistry. According to the adsorption free energy, the results presented here demonstrated that the interaction between levan and membrane surface was manipulating by electrostatic（EL） and van der Waals（LW） interaction, and adsorption was reversible.

关 键 词：吸附 果聚糖 聚偏氟乙烯膜 

分 类 号：X703[环境科学与工程—环境工程]