Adsorption characteristics of chitooligosaccharides onto activated charcoal in aqueous solutions  

作　　者：YU Yu LI Kecheng 

机构地区：[1]Marine Science and Engineering College,Qingdao Agricultural University,Qingdao 266109,China [2]Key Laboratory of Experimental Marine Biology,Center for Ocean Mega-Science,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [3]Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China

出　　处：《Journal of Oceanology and Limnology》2020年第2期342-350,共9页海洋湖沼学报（英文）

基　　金：Supported by the Talent Research Foundation of Qingdao Agricultural University(No.1114347)

摘　　要：To investigate the adsorption characteristics of chitooligosaccharides in solution onto activated charcoal,we studied the optimal adsorption conditions and the adsorption mechanisms of the chitooligosaccharides onto activated charcoal,which will greatly promote the application of activated charcoal in the chitooligosaccharides separation and purification.We studied the effects of particle size of activated charcoal,pH of solution,contact time,temperature,and initial concentration of chitooligosaccharides on the adsorption behavior in batch mode experiments.Activated charcoal in fine particle size showed a high uptake of chitooligosaccharides.Weak alkaline solution(pH 8–9)was the most favorable to the adsorption.The adsorption equilibrium after 60 min was established,which followed a pseudo-second-order kinetic model.The adsorption capacity(Q_(max))reached 0.195 g/g(chitooligosaccharides/activated charcoal)at 298 K.The adsorption was temperature-insensitive,and the adsorption isotherms could be best described by the Langmuir equation.Chitooligosaccharides adsorbed on activated charcoal could be desorbed in 50%ethanol solution in combination with an acidic condition(pH 2),reaching desorption efficiency of 96.0%.These findings are of great significance for the production and purification of amino oligosaccharides including chitooligosaccharides using activated charcoal.To investigate the adsorption characteristics of chitooligosaccharides in solution onto activated charcoal,we studied the optimal adsorption conditions and the adsorption mechanisms of the chitooligosaccharides onto activated charcoal,which will greatly promote the application of activated charcoal in the chitooligosaccharides separation and purification.We studied the effects of particle size of activated charcoal,pH of solution,contact time,temperature,and initial concentration of chitooligosaccharides on the adsorption behavior in batch mode experiments.Activated charcoal in fine particle size showed a high uptake of chitooligosaccharides.Weak alkaline solution（pH 8–9） was the most favorable to the adsorption.The adsorption equilibrium after 60 min was established,which followed a pseudo-second-order kinetic model.The adsorption capacity(Qmax) reached 0.195 g/g（chitooligosaccharides/activated charcoal） at 298 K.The adsorption was temperature-insensitive,and the adsorption isotherms could be best described by the Langmuir equation.Chitooligosaccharides adsorbed on activated charcoal could be desorbed in 50% ethanol solution in combination with an acidic condition（pH 2）,reaching desorption efficiency of 96.0%.These findings are of great significance for the production and purification of amino oligosaccharides including chitooligosaccharides using activated charcoal.

关 键 词：CHITOOLIGOSACCHARIDE ADSORPTION activated charcoal KINETICS ISOTHERM 

分 类 号：TQ424.1[化学工程] O629.12[理学—有机化学]