Pb2+ Removal from Aqueous Solutions by Amidoximized-semi-IPN

Abstract

The subject of this investigation is the use of amidoximized semi-interpenetrating polymer network polymeric adsorbent (s-IPN_a) for removal of Pb²⁺ from aqueous medium. S-IPN_a was prepared from the amidoximation of –CN terminals of the s-IPN obtained by irradiation of Poly (ethylene glycol) in acrylonitrile solution under a dose of 14 kGy with a ⁶⁰Co gamma source. Semi-interpenetrating polymer networks (s-IPN) and modified s-IPN_a structures were characterized by FT-IR, TGA and SEM analysis. The adsorbent properties of s-IPN_a were evaluated by investigating the change of Pb²⁺ adsorption with pH, concentration, mass, time and temperature. Adsorption isotherms were obtained for 25-2000 ppm concentration range, the adsorption reached up to 60% in 500-2000 ppm interval. The maximum adsorption capacity obtained from the Langmuir adsorption isotherm is X_L = 678 mg g^-1. The adsorption obeyed to pseudo-second order reaction kinetics and half-life was calculated as 176 minutes. Thermodynamics data obtained from the change in adsorption by temperature (ΔH=59.3 kJ mol^-1, ΔS=246.1 J mol^-1 K^-1, ΔG=-14.0 kJ mol^-1) demonstrated that adsorption is endothermic and spontaneous. The adsorption of Pb²⁺ in presence of equimolar Al³⁺ was ≈%60.  This result might be considered as a proof for the selectivity of s-IPN_a for divalent cations.

Keywords

• Adsorption,Lead,Semi-IPN,Amidoximized

Amidoksimleştirilmiş Yarı-IPN ile Sulu Çözeltiden Pb2+ Giderimi

Abstract

Bu araştırmanın konusu amidoksimleştirilmiş yarı-içiçe geçmiş ağ yapılı polimerik adsorbanın (y-IPN_a) sulu çözeltiden Pb²⁺ uzaklaştırmada kullanımıdır. Y-IPN_a, Poli (etilen glikol)’ün akrilonitrildeki çözeltisinin ⁶⁰Co γ-kaynağıyla 14 kGy dozda ışınlanmasıyla hazırlanan yarı-iç içe geçmiş ağ yapıdaki (y-IPN)        –CN uçlarının amidoksimleştirilmesiyle hazırlanmıştır. y-IPN ve y-IPN_a yapıları, FT-IR, TGA ve SEM analizleri ile karakterize edilmiştir. y-IPN_a’nın adsorban özellikleri Pb²⁺ adsorpsiyonun pH, derişim, kütle, zaman ve sıcaklık ile değişimi araştırmalarıyla değerlendirilmiştir. 25-2000 ppm başlangıç derişimi aralığında adsorpsiyon izotermleri elde edilmiş, 500-2000 ppm aralığında %60’a ulaşan adsorpsiyon gözlenmiştir. Langmuir adsorpsiyon izoterminden elde edilen maksimum adsorpsiyon kapasitesi X_L=678 mg g^-1’dir. Adsorpsiyon kinetiğinin yalancı ikinci derece tepkime kinetiğine uyduğu gözlenmiş ve yarı ömür 176 dk olarak hesaplanmıştır. Adsorpsiyonun sıcaklıkla değişiminden elde edilen termodinamik veriler (ΔH=59.3 kJ mol^-1, ΔS=246.1 J mol^-1 K^-1,     ΔG=-14.0 kJ mol^-1) adsorpsiyonun endotermik ve kendiliğinden olduğunu göstermiştir. Eş molar Al³⁺ iyonu varlığında Pb²⁺ adsorpsiyonunun ≈%60 olduğu gözlendi. Bu sonuç y-IPN_a’nın 2+ değerlikli metallere karşı seçici olduğu ile ilgili bir kanıt olabilir.

Keywords

• Adsorpsiyon,Kurşun,Yarı-IPN,Amidoksimleşme

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