基于吸附原理的皮革等电点测定新方法  

SDBS Adsorption Method: A New Method for Determination of Isoelectric Point of Skin and Leather

作　　者：孙青永[1] 王亚楠[2] 廖学品[2] 石碧[1] 

机构地区：[1]四川大学皮革化学与工程教育部重点实验室,四川成都610065 [2]四川大学制革清洁技术国家工程实验室,四川成都610065

出　　处：《中国皮革》2013年第1期9-13,18,共6页China Leather

基　　金：国家科技支撑计划(2011BAC06B11);国家自然科学基金(20976111)

摘　　要：试验表明,十二烷基苯磺酸钠(SDBS)在皮革上的吸附主要为静电吸附。根据这一原理,以皮革样品为吸附剂,以十二烷基苯磺酸钠(SDBS)为吸附质,建立了一种测定皮革等电点的新方法—SDBS吸附法。该方法的优化试验条件是:用0.2g皮革样品对100mL浓度为0.5mg/mL的SDBS溶液进行吸附(30℃,4h),获得平衡吸附量qe-pH曲线,进而得到皮革样品的等电点值。用该方法测得的皮革的等电点分别为:生皮8.4～8.5,脱灰皮7.1～7.2,浸酸皮5.8～5.9,铬鞣革7.7～7.9,铝鞣革8.5～8.6,锆鞣革7.3～7.4,戊二醛鞣革5.1～5.2,TWT鞣革5.8～5.9。这些等电点数据基本符合实际情况,表明该方法具有良好的普遍适用性。Experiments indicated that the predominant adsorption mechanism of sodium dodecyl benzene sulfonate （SDBS） on leathers is electrostatic interaction. On the basis of this principle, a novel method was proposed to determine the isoelectric point of pelts and leathers by using pelt or leather as absorbent and SDBS as absorbate. The optimal determination conditions for this method were established as follows ： 100mL of 0. 5mg/mL SDBS solution is absorbed by 0. 2g pelt or leather powder for 4h at 30℃, so that the equilibrium adsorption amounts of SDBS （qe） at different pH values are determined. The curve of qe - pH is plotted and then the isoelectric point of pelt or leather is obtained. By this method, the isoelectric points of a series of pelts and leathers were determined. They are 8.4 ~ 8.5 for soaked skin, 7. 1 ~ 7.2 for delimed pelt, 5.8 ~ 5.9 for pickled pelt, 7.7 - 7.9 for chrome tanned leather, 8.5 ~ 8. 6 for aluminum tanned leather, 7.3 ~ 7.4 for zirconium tanned leather, 5. 1 ~ 5.2 for glutaral- dehyde tanned leather and 5.8 - 5.9 for TWT tanned leather. In general, these isoelectric point values are reasonable for practical features of the pelis and leathers, which shows that this method could be widely applied in leather field.

关 键 词：皮革 等电点 SDBS 吸附 

分 类 号：TS57[轻工技术与工程—皮革化学与工程]