Synthesis, characterization, morphology and adsorption performance towards Cu+2 ions of nano-sized copolymers of anthranilic acid and o-phenylenediamine poly(AA-co-o-PD)

Abstract

N ANORODES, nanosheets, nanospheres and nano-amorphous shape with different particles size of copolymer of anthranilic acid with o-phenylenediamine poly(AA-co-o-PD) were synthesized by redox polymerization initiated by FeSO 4 .7H 2 O as redox initiator and ammonium peroxydisulfate (APS) as oxidant in different concentrations of aqueous solutions of hydrochloric acid. The influence of synthetic parameters such as acid concentration and the presence of redox initiator were investigated. The morphology and particles size were studied by transmission electron microscope (TEM) and scanning electron microscope (SEM). The results showed that the morphology and average particle size of polymeric nano particles according to SEM and TEM analyses were different based upon the conditions of the copolymerization. The physico-chemical characterization of the prepared nanoparticles was carried out by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD). Which FT-IR confirmed the structure of poly(AA-co-o-PD) nanoparticles in emeraldine form. The molecular weight was determined by gel permeation chromatography (GPC). The surface area of nanocopolymer particles was determined also by Brunauer-Emmett-Teller (BET). The competition of the prepared nano-sized copolymers particles towards the adsorption of copper ions from aqueous solutions was investigated. The results showed that the adsorption capacity was based on particle size of nanocopolymers and their surface area. The adsorption capacity increased with decreasing the particle size. On the other hand the adsorption capacity increased with increasing the surface area of the prepared nano-sized copolymers of poly(AA-co-o-PD).

Copolymerization of anthranilic acid and o-phenylenediamine by a free radical in the presence of nanoparticles of copper hexacyanoferrates for the removal of cesium ions in aqueous solutions

“…5a, the spectrum of CHCF exhibits sharp peak at 2095 cm −1 due to the stretching vibration of cyanide group (C≡N) and the bands in the 480-592 cm −1 region are due to the (Fe-C) stretching. Figure 5b shows the spectrum of CSNC, which exhibits (-NH 2 ) primary amino groups in the FT-IR spectrum which indicates that the composite was formed through the head-to-tail coupling of the two monomers via -NH-groups [31,46]. The peak that observed at 3410 cm −1 is due to primary amine (-NH 2 ) group [47].…”

“…The synthesized CSNC is used for the removal of Cs + ions found in wastewater by ion exchange process, in which the potassium ions in CSNC were replaced by cesium ions as shown in Scheme 2. [31,33].…”

“…Ortho phenylenediamine (OPD) has a structure consisting of 1,4-substituted benzenoid and quinoid moieties and was proposed for the polymer obtained electrochemically and it exhibits high thermostability [31]. OPD is soluble electroactive in the polymer due to its dissolution in organic solvents.…”