Amidoksimleştirilmiş Yarı-IPN ile Sulu Çözeltiden Pb2+ Giderimi

Bu araştırmanın konusu amidoksimleştirilmiş yarı-içiçe geçmiş ağ yapılı polimerik adsorbanın (y-IPNa) sulu çözeltiden Pb2+ uzaklaştırmada kullanımıdır. Y-IPNa, 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-IPNa yapıları, FT-IR, TGA ve SEM analizleri ile karakterize edilmiştir. y-IPNa’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 XL=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-IPNa’nın 2+ değerlikli metallere karşı seçici olduğu ile ilgili bir kanıt olabilir.

Anahtar Kelimeler:

Adsorpsiyon, Kurşun, Yarı-IPN, Amidoksimleşme

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

The subject of this investigation is the use of amidoximized semi-interpenetrating polymer network polymeric adsorbent (s-IPNa) for removal of Pb2+ from aqueous medium. S-IPNa 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-IPNa structures were characterized by FT-IR, TGA and SEM analysis. The adsorbent properties of s-IPNa 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 XL = 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-IPNa for divalent cations.

Keywords:

Adsorption, Lead, Semi-IPN, Amidoximized,

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