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

Yıl 2018, Cilt: 20 Sayı: 60, 776 - 796, 15.09.2018

Demet Baybaş

Öz

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.

Anahtar Kelimeler

Adsorption, Lead, Semi-IPN, Amidoximized

Amidoksimleştirilmiş Yarı-IPN ile Sulu Çözeltiden Pb2+ Giderimi

Öz

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.

Anahtar Kelimeler

Adsorpsiyon, Kurşun, Yarı-IPN, Amidoksimleşme

Kaynakça

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