Abstract
Low molecular weight fractions of polydisperse polyelectrolytes can penetrate the porous structure of cellulose fibers, whereas the high molecular weight fraction cannot. The effects of polydispersity on polyelectrolyte adsorption, especially for polyelectrolytes with a very broad size distribution, often encountered in industry, can be very pronounced. Previously we showed that the adsorption rate constant for polyethylene imine (PEI) adsorbing on pulp fibers, as well as the maximum adsorption capacity, roughly increased by a factor of 4, when the pH was increased from 6 to 10. The increase in adsorption capacity was explained by the decrease in the size of a PEI molecule, by almost a factor of two. The increase in rate was explained by the increase in the low molecular weight fraction of PEI which could penetrate the fibers. To explain the results, this low molecular weight fraction should be four times as large at pH 10, compared to pH 6. Here, we discuss the results of experiments on PEI adsorption in packed beds of cellulose fibers, which confirm this hypothesis.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.