Facile preparation of EDTA‐functionalized chitosan magnetic adsorbent for removal of Pb(II)

Abstract

A novel magnetic adsorbent (EDTA/chitosan/PMMS) was facilely prepared by reacting chitosan with EDTA anhydride in presence of PEI-coated magnetic microspheres. The as-synthesized EDTA/chitosan/PMMS was characterized by XRD, SEM, TGA, FT-IR, and VSM, and then employed in removal of heavy metals of Pb(II) from aqueous solution. The results of the batch adsorption experiments revealed that the adsorbents had extremely high uptake capacities for Pb(II) in the pH range of 2 to 5.5, and the adsorption kinetics for EDTA/chitosan/PMMS was consistent with the pseudo-second-order kinetic model. Moreover, its equilibrium data were fitted with the Langmuir isothermal model well, which indicated that the adsorption mechanism was a homogeneous monolayer chemisorptions process. The maximum adsorption capacity of EDTA/chitosan/PMMS for Pb(II) was found to be 210 mg g 21 at pH 4 (308C), and further reuse experiments results suggested that EDTA/chitosan/PMMS could be a potential recyclable magnetic adsorbent in the practical wastewater treatment.

Heavy metal removal using hydroxypropyl cellulose and polyacrylamide gels, kinetical study

“…In all experiments, the highest metal removal was at pH 4, suggesting that osmotic pressure and ionic strength plays a role in the adsorption process. The point of zero charge was determined to be 9.54 (see Figure S2 in the Supporting Information); however, the highest sorption values were found at 4, this is attributed to the chelating properties of the polymer, as it has OH, COOH and NH groups; other works have observed this effect on EDTA–chitosan magnetic adsorbents composites for lead removal, where the acidic pH favored the formation of EDTA–lead complexes. At alkaline pH the metals formed hydroxides and precipitated, this contributed to the observed lower adsorption of Pb at alkaline pH and prevented the experiment with the other metals at higher pH.…”

“…Due to the importance of water, the limited amount of freshwater, and the growing world population, the treatment of wastewater is of great importance, as it can be recycled or safely disposed to the environment. Heavy metals are among the pollutants of freshwater, as they are dangerous to health, this problem has become a priority in water treatment . Lead is one of the heavy metals found in water, it is a dangerous element as it is neurotoxic and harmful to health .…”

“…Heavy metals are among the pollutants of freshwater, as they are dangerous to health, this problem has become a priority in water treatment . Lead is one of the heavy metals found in water, it is a dangerous element as it is neurotoxic and harmful to health . Other elements often found in water are nickel and copper …”

Bio-inspired perylene diimide coated super paramagnetic nanoparticles for the effective and efficient removal of lead(ii) from aqueous medium

“…7, shows the reduction from 100 to 3.675 ppm, which sets a new benchmark in the series of previously reported adsorbents, indicating its high surface area for adsorption. The unit measure of the affinity of a sorbent for a specific metal ion is the distribution coefficient (K d ) measurement: 42,43,[75][76][77][78][79][80][81]…”

Metal Recovery and Preconcentration by Aminopolycarboxylic Acid modified Silica Surfaces

“…In our earlier studies silica gel was functionalized with Ethylenediaminetetraacetic Acid (EDTA) and Diethylenetriamine--Pentaacetic (DTPA) and produced adsorbents used for the removal of cobalt and nickel from aqueous solutions [12,13]. More recently, EDTA has been used to modify graphene in order to remove nickel from the wastewater [14] and EDTA-modified magnetic chitosan used for the lead adsorption [15]. However, graphene is quite expensive material and chitosan not appropriate for the column experiments due to its swelling.…”