Adsorption of Dyes, Chromate, and Metallic Ions by Poly(ethyleneimine)

Abstract

Ion exchange and chelate properties of poly(ethyleneimine) resin (PEI) were studied. Adsorption of neucoccin anions (NC−) (maximum 1.7×10−4 mol/g) was greater than that of Crystal Violet cations (CV+) (maximum 0.17×10−4 mol/g), indicating that PEI is an anion exchanger. CV+ adsorption increased with the addition of sodium polyacrylate due to its bridging action between CV+ ions and PEI. Adsorption of CrO42− was confirmed to be much greater than that of NC− ions amounting to 4×10−3 mol/g at a sufficiently concentrated solution of CrO42−. The acid exchange capacity of PEI was found to be about the same as the maximum amount of adsorption of CrO42−. Kinetics of adsorption of CrO42− by PEI was studied at various temperatures. Adsorption followed a bimolecular reaction. Activation energy of 28.03×103 J/mol obtained is a right order of magnitude as an ion exchange adsorption. Chelating adsorption of Fe3+ and Cu2+ ions by PEI studied, the maximum amounts of adsorption being 3.1×10−3 mol/g and 3.3×10−3 mol/g, respectively. The values are greater than those for other synthetic polyethylene polyamine. PEI can be used as an anion and metallic cation adsorbent.

Functional Magnetic Nanoparticles for Biodefense and Biological Threat Monitoring and Surveillance

“…Prior to the precipitation by ammonia, the Fe ions in the aqueous mixture were complexed with PEI under slightly acidic conditions (pH 6). Complexation of PEI with Fe ions is well-known …”

“…Complexation of PEI with Fe ions is well-known. 16 The PEI-M particles were further conjugated with PHMBG via linking of the amino groups of PEI with the amino/imino groups of PHMBG by glutaraldehyde, resulting in the PHMBG chains being exposed to the exterior of the nanoparticle clusters (see Figure 2). Such a Schiff-base conjugation is analogous to enzyme immobilization onto PEI-coated magnetite particles using glutaraldehyde.…”

Uptake Capacity of Pb2+ by Sulphonated Biomass of Cicer arietinum: Batch Studies

“…Farooqui et al reported the use of leaves of cauliflower [5] for removal of iron from wasterwater. Removal of Fe 2+ , Zn 2+ , and Mg 2+ from polluted water using thioglycolic modified oil-palm fibre [6] was done by Akaniwor et al who worked on adsorption of dyes, chromate, and metallic ions by poly(ethyleneimine) [7]. Adsorption behavior of Cd 2+ , Pb 2+ , Ni 2+ , Cd 2+ , and Zn 2+ from aqueous solutions by Mangifera indica [8] seed shell was reported by Ajmal et al Choy and Mckay studied the rate of adsorption of cadmium [9], copper, and zinc ions onto bone char in three single component systems using an agitated batch adsorbent rice straw, soybean hull, sugar bagasse.…”

Selective ion exchange polymers

“…A similar condensate between polyethylenimine and methylolthiourea was patented(67). insoluble by product during the synthesis of polyethylenepolyamine oligomers, was studied a s a chelating anion exchanger f o r adso t i o n of c r y s t a l v i o l e t and neuococcin dyes and Cu(II), Fe(II1) and C r O r ions(68). Ethylenediamine chelates with mixed secondary -terUary, aromatic amine ---16,17,18 have been studied by Melby (691, b n e s and Grinstead(70a,b), and Warshawsky (6Cb), N-(P-pyridylmethyl) -2,2'-diaminobiphenyl polymer -16, or N,N'-bis (2+yridylmethyl)-2,2'diamino biphenyl polymer 17, contain a r i g i d t r i d e n t a t e or tetradentate chelating structure G9).…”