Abstract
A novel cellulose-based amphoteric adsorbent (MCC/DTPA-PEIA) with a high density of amino and carboxyl groups for the simultaneous complete removal of anionic and cationic heavy metal ions was designed and prepared by using cross-linking with microcrystalline cellulose (MCC) and DTPA-PEI, which was synthesized by the modification of diethylenetriaminepentaacetic acid (DTPA) with polyethylenimine (PEI). The MCC/DTPA-PEIA could completely remove Cr(VI), Cd(II), Cu(II), Zn(II) and Pb(II), and the remaining concentrations of low-level heavy metal ions after adsorption (2000 ppb) could reach the safe drinking level standards (US EPA). In addition, the cellulose-based amphoteric adsorbent exhibited good regeneration. It is interesting to note that the MCC provided by the MCC/DTPA-PEIA skeleton improved the adsorption rate of heavy metal ions. The competitive adsorption behaviors for anionic and cationic heavy metal ions on cellulose-based amphoteric adsorbents depend on the affinities of heavy metal ions for the amino and carboxyl groups of the adsorbents, and the simultaneous complete removal of MCC/DTPA-PEIA for low-level Cr(VI), Cd(II), Cu(II), Zn(II) and Pb(II) was attributed to the specialization and cooperation mechanism between amino and carboxyl groups of MCC/DTPA-PEIA.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
