Abstract
A new spherical cellulose-based adsorbent and high phosphate removal rate microcrystalline cellulose-g-acrylamide/ethylenediamine/phthalic anhydride (MCC-g-AM/EDA/PA) loaded Fe(iii) adsorbent was prepared by a pre-radiation grafting and chemical modification method. Fe(iii) was successfully introduced into the modified grafted chains of the MCC-g-AM/EDA/PA resin, and characterized by FTIR, TG, XRD, SEM and XPS. The optimized conditions for the grafting reaction of acrylamide (AM) onto MCC were 20% AM emulsion at an absorbed dose of 30 kGy, and a grafting rate as high as 247%. In addition, the adsorption performance of the adsorbent was tested by static adsorption experiments with phosphate. The adsorbent resin showed excellent adsorption performance under alkaline conditions, contributions to the synergetic effect of precipitation, and inner-sphere surface complex reactions. The adsorption efficiency can reach 89.7% at low concentration. In summary, the neotype spherical cellulose-based adsorbent has the advantages of being separation-free in bulk materials, avoiding secondary pollution, and being easy to recycle, and it could be employed as an environmentally friendly adsorbent for phosphate removal in eutrophic water.
Highlights
The rapid pace of industrialization and tremendous increase of the human population in the last few decades have caused serious environmental pollution
We report a new spherical cellulose-based MCCg-AM/EDA/phthalic anhydride (PA) with Fe(III) chelation adsorbent prepared by a pre-radiation gra ing and chemical modi cation method for the removal of phosphate in aqueous solutions
Compared with the spectrum of Microcrystalline cellulose (MCC)-g-AM, a new characteristic peak for MCC-g-AM/EDA appeared at 1536 cmÀ1, which was attributed to N–H groups of EDA
Summary
The rapid pace of industrialization and tremendous increase of the human population in the last few decades have caused serious environmental pollution. We report a new spherical cellulose-based MCCg-AM/EDA/PA with Fe(III) chelation (denoted as: MAF) adsorbent prepared by a pre-radiation gra ing and chemical modi cation method for the removal of phosphate in aqueous solutions.
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