ADSORPTION OF Ni(II) IONS FROM AQUEOUS SOLUTIONS ONTO MAGNETIC POLY( DIVINYLBENZENE-CO-VINYLIMIDAZOLE) MICROBEADS: PHYSICOCHEMICAL STUDIES

Year 2012, Volume: 13 Issue: 1, 31 - 49, 12.03.2012

Ali Kara , Emel Demirbel

Abstract

A modified suspension polymerization was used for the preparation of the mesoporous magnetic-poly(divinylbenzene-co-vinylimidazole) (m-poly(DVB-VIM)) microbeads in size 53-212 μm of average diameter. The specific surface area and the DVB/VIM mol ratio of the microspheres were determined as 29.47 m²/g and 1:4 mol/mol with Fe₃O₄, respectively. The physicochemical studies of adsorption of Ni(II) ions from aqueous solutions such as pH, initial concentration, amount of mesoporous m-poly(DVB-VIM) microbeads, contact time, and temperature onto the m-poly(DVBVIM) microspheres were carried out. The maximum adsorption capacities of the m-poly(DVB-VIM) microspheres towards Ni(II) ions were determined as 13.51, 20.14, 21.00 and 23.62 mg/g at 277 K, 298 K, 318 K, and 338 K, respectively. The dynamic and equilibrium adsorption behaviours of the system were adequately described by the pseudo-second-order kinetic and the Langmuir isotherm models, respectively. Various thermodynamic parameters, such as the Gibbs' free energy change ( Δ G^o), the standard enthalpy change (Δ H^o) and the standard entropy change (Δ S^o) were also determined. Morever, after use in the adsorption, the m-poly(DVB-VIM) microbeads with paramagnetic property was separated from the via the applied magnetic force. These results indicate that the material studied could be used as a purifier for the removal of Ni(II) ions from water and wastewater under magnetic field.

 

 

Keywords

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MANYETİK-POLİ (DİVİNİLBENZEN-KO-VİNİLİMİDAZOL) MİKROKÜRELER İLE SULU ÇÖZELTİLERDEN Ni(II) İYONLARININ ADSORPSİYONU: FİZİKOKİMYASAL ÇALIŞMALARI

Abstract

Ortalama çapı 53-212 μm olan mezogözenekli manyetik-poli(divinilbenzen-ko-vinilimidazol) (mpoli(DVB-VIM)) mikrokürelerinin hazırlanması için modifiye süspansiyon polimerizasyonu kullanıldı. Mikrokürelerin spesifik yüzey alanı 29.47 m2g-1 ve Fe3O4 ilavesiyle birlikte, DVB/VIM mol oranı 4:1 mol/mol olarak belirlendi. Fizikokimyasal çalışmalar m-poli (DVB-VIM) mikroküreleri üzerine pH, başlangıç konsantrasyonu, mikroküre miktarı, temas süresi ve sıcaklık gibi parametrelerle incelendi. m-poli(DVB-VIM) mikrokürelerinin Ni(II) iyonlarına karşı maksimum adsorpsiyon kapasitesi 277 K, 298 K, 318 K ve 338 K’de sırasıyla 13.51, 20.14, 21.00 ve 23.62 mg.g-1 olarak belirlendi. Sistemin dinamik ve denge adsorpsiyon davranışları sırasıyla yalancı ikinci derece model ve Langmuir izoterm modeliyle açıklandı. Gibbs serbest enerji değişimi (ΔG0), standart entalpi değişimi (ΔH0) ve standart entropi değişimi (ΔS0) gibi termodinamik parametreler belirlendi. Ayrıca adsorpsiyonda kullanımdan sonra, paramanyetik özellikli m-poli (DVB-VIM) mikroküreleri uygulanan manyetik kuvvet yardımıyla ayrıldı. Bu sonuçlar, çalışılan malzemenin manyetik alan altında su ve atık sulardan Ni(II) iyonlarının uzaklaştırılması için kullanılabilir olduğunu gösterdi.

Keywords

Manyetik polimerler, Adsorpsiyon izotermi, Adsorpsiyon kinetiği, Adsorpsiyon termodinamiği, Ni (II) iyonları

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