Synthesis and characterization of a new iminodiacetate chelating resin for removal of toxic heavy metal ions from aqueous solution by batch and fixed bed column methods

Abstract

New porous chelating resin beads CPN-IDA were prepared by the reaction of poly (acrylonitrile-co-N,N'-methylenebisacrylamide) with etheylenediamine and sodium chloroacetate, respectively. The composition and morphology of the chelating resin was characterized by Fourier transform infrared spectroscopy (FTIR), thermal analysis (TGA and DrTGA), scanning electron microscopy (SEM),surface area measurements by N 2 adsorption (S BET ) and water regain (w%). Batch adsorption experiments were employed to study the impact of some factors that control the adsorption of metal ions including solution pH, concentration of metal ions, contact time and the temperature of the solution. Batch sorption results showed that the chelating resin had high affinity towards Cu(II), Cd(II) and Pb(II). The saturated adsorption capacity at 25 o C was 2.43, 1.93 and 1.45 mmolg −1 resin for Cu(II), Cd(II) and Pb(II), respectively. Among the empirical isotherm models, the equilibrium adsorption results were obviously fitted with Langmuir model. The kinetics was analyzed using pseudo-first-order, pseudo-second-order, and intra-particle diffusion equations. The adsorption kinetic data were well elucidated with pseudo-second-order kinetic model. Thermodynamic parameters were calculated for the uptake of the metal ions under study and it was found to be a spontaneous process. Moreover, the adsorption of metal ions has been studied using column technique. The regeneration of CPN-IDA was experimentally performed by using nitric acid. The chelating resin was used repeatedly for five times with a little decrease in sorption of metal ions.

Highly porous, water‐swellable, and reusable chelating polymeric gels for heavy metal ion removal from aqueous waste

“…Also, some IDA functionalized resins are commercially available such as Amberlite IRC‐748, Chelax 100, Lewatit TP207, and so forth, used for water purification 22–25 . These are synthesized either by the chemical modification of crosslinked resins or by polymerization of IDA functionalized vinyl monomers 26–29 . The major drawbacks of chemical modification are the multistep synthetic steps with incomplete conversion at the reactive ends in each step.…”

Estudo da biossorção de cianeto de mercúrio gerado na mineração artesanal do ouro visando a descontaminação de águas residuais.

“…A Figura 11 mostra os três estágios para um sistema de adsorção de cobre em resina quelante. BAHY, 2016;MOHAN et al, 2001;OFOMAJA, 2010).…”

Recuperação de cobre de uma solução sintática baseada no licor de lixiviação atmosférica do minério limoní­tico de níquel por troca iônica utilizando a resina quelante Dowex.

“…Redlich-Peterson[89,95,96]. No presente estudo, os modelos escolhidos foram de Langmuir, Freundlich e Temkin, por corresponderem a modelos que expressam diferentes mecanismos de adsorção entre trocadores iônicos e íons metálicos[97,98]. Eq.…”

“…Assim, o mecanismo de troca iônica é controlado por etapas, as quais ocorrem entre a solução de um sistema heterogêneo, a camada limite de Nernst e o trocador iônico. Entre os modelos cinéticos disponíveis na literatura, podem ser citados:pseudoprimeira-ordem, pseudosegunda-ordem e difusão intrapartícula[97,112].A equação cinética pseudoprimeira-ordem, apresentada por Lagergren, é um dos modelos mais utilizados na literatura para descrever o mecanismo de…”

“…0,5 é possível identificar as três etapas propostas por Weber e Morris. Os autores El-Bahy eEl-Bahy[97] identificaram três etapas para a adsorção do cobre(Cu 2+ ), cádmio (Cd 2+ ) e chumbo (Pb 2+ ) utilizando iminodiacético, como grupo funcional de uma resina quelante (Figura 20)[97]. Com a variação da temperatura, os parâmetros termodinâmicos podem ser obtidos, tais como, a energia livre de Gibbs (∆G°), a entalpia (∆H°) e a entropia (∆S°).A variação da energia livre de Gibbs pode ser calculada conforme a Eq.…”