聚乙烯醇缩丁醛包膜球形活性炭对血液模拟体系的吸附

Adsorption performance of polyvinyl butyral encapsulated spherical activated carbon in blood simulation system

摘要:

利用聚乙烯醇缩丁醛（PVB）对球形活性炭进行包覆并分析PVB溶液质量分数及其分子量，对肌酐、VB12和溶菌酶所构成的血液模拟体系吸附性能的影响。利用吸附动力学与吸附等温线对单组分及相对差异性双组分吸附过程进行分析。采用SEM、BET、压汞法孔隙率测定及FTIR对包覆活性炭形貌、结构进行表征。结果表明：包膜前后活性炭的吸附机理均为化学吸附，PVB质量分数对吸附量及吸附速率的影响最大，且随质量分数的增大而下降显著；PVB分子量则影响较小，但对增强炭表面亲水作用意义重大。双组分体系下：溶菌酶对VB12的竞争吸附作用明显，VB12的竞争吸附强度高达30%以上；肌酐与溶菌酶体系中，两者竞争吸附强度均低于8%，竞争吸附现象不明显。

Abstract:

The encapsulated spherical activated carbon was prepared with polyvinyl butyral (PVB) under different PVB solution mass fraction and molecular weight. Then the adsorption performance of encapsulated spherical activated carbon was investigated in blood simulation system consisting of creatinine, VB12 and lysozyme. The single component and differential binary component adsorptions processes were analyzed by using adsorption kinetics and adsorption isotherms. The structure and morphology of encapsulated spherical activated carbon were characterized by SEM, BET, mercury intrusion porosimetry and FTIR. The results showed that the adsorption mechanism of activated carbon before and after encapsulating were chemical adsorption. PVB mass fraction was the factor which had the greatest influence on the adsorption amount and the adsorption rate. Adsorption decreased significantly with the increase of the mass fraction. The molecular weight of PVB had minor effect, but it was of great significance in enhancing the hydrophilic effect on the carbon surface. In the binary component system, lysozyme had a significant competitive adsorption effect on VB12, up to 30% adsorption strength of VB12. In another system consisting of creatinine and lysozyme, the adsorption strength of both components were below 8% and the competitive adsorption phenomenon was not obvious.