应用美兰吸附法测定纤维素表面积的讨论  

Study of Methylene Blue Sorption Method in the Determination of Specific Area of Cellulose

作　　者：武彬[1] 王禄山[1] 张为灿[1] 赵越[1] 高培基[1] 

机构地区：[1]山东大学微生物技术国家重点实验室,山东济南250100

出　　处：《纤维素科学与技术》2004年第4期23-30,共8页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金资助(No.30370013);国家"973"重点项目基金资助课题(No.2003CB716006)

摘　　要：以Prism4.0软件包将不同纤维材料吸附美兰的数据拟合Scatchard方程、Klotz-Hunston方程、Langmuir方程的一般形式和单点双曲线吸附方程,据此研究了由美兰等染料分子在纤维基质表面上的吸附从而推算基质的表面积的方法机理和局限性。分析表明Langmuir模型和单点双曲线模型的拟合得到的饱和吸附量为外推值,会导致测量结果失真;而用Sigmoidal dose-response(Variable slope)模型拟合时,则能给出真实吸附量。研究结果还显示,由纤维素分子链自由羟基所介导的美兰吸附不会发挥主导作用,而红外ATR结果和美兰的脱吸附试验表明美兰在纤维素表面上的吸附应为物理吸附,所以根据美兰分子平卧于纤维表面面积162 ?,计算纤维表面积,得到了四种纤维材料的比表面积。但由于真实界面浓度的确定方法仍存在矛盾,也缺少一个直观的检测标准,因此文章中给出的数值仍为一相对的比较值。Prism 4.0 software package was used to fit the adsorption data into Scatchard equation, Klotz-Hunston equation, Langmuir equation-general form and one-site hyperbola form. According to the results, mechanism and limit of the method that estimate the special area of fiber materials by the adsorption of dyes such as methylene blue one the surface. Analysis shows that Langmuir model and one-site hyperbola form will lead to inaccurate result in that Bmax is a extrapolative value; while fit for Sigmoidal dose-response(Variable slope) model, will give the real binding value. As the IR-ATR and methylene blue disadsorb experiment shows the adsorption should be physical adsorption. In addition since the special area of methylene blue is 162?, the special area of four fiber materials was estimated. However, as is difficult in calculating real interface concentration, and the racking of direct measure standard, the value presented is still a relative one.

关 键 词：美兰 附方 平卧 研究结果 介导 纤维素 ATR 界面浓度 表面积 分子链 

分 类 号：TQ021[化学工程]