Kader TERZİOĞLU, HASAN TÜRE, EVREN TUNCA

Manyetik aljinat/perlit kompozit mikrokürelerin karakterizasyonu ve sulu çözeltiden Pb (II) ve Ni (II) iyonlarının uzaklaştırılmasında optimum şartların belirlenmesi

Sunulan çalışmanın amacı manyetik aljinat/perlit kompozit mikrokürelerin hazırlanması, karakterizasyonu ve sentezlenen mikrokürelerin sulu çözeltiden kurşun ve nikel ağır metal iyonlarının uzaklaştırılmasında kullanılabilirliğinin araştırılmasıdır. Mikrokürelerin ağır metal adsorpsiyon kapasitesi üzerine perlit konsantrasyonunun, başlangıç metal iyon derişiminin ve çözeltinin pH’nın etkileri araştırılmıştır. Demir oksit partikülleri basit çöktürme yöntemiyle, mikrokürelerin sentezinde iyonik jelasyon yöntemi kullanılmıştır. Demir oksit içeren mikrokürelere perlit eklenmesi ile mikrokürelerin su tutma kapasiteleri azalmıştır. SEM analizi mikrokürelerin küremsi yapıda ve yüzeyinin pürüzlü olduğunu göstermiştir. SEMEDX analizi manyetik aljinat/perlit mikrokürelerin C, O, Na, Al, Si, K, Cl ve Fe içerdiğini ortaya koymuştur. XRD analizi sentezlenen demir oksit tozunun Fe3O4 olduğunu belirtmiştir. TGA analizi perlit ilavesi ile mikrokürelerin termal dayanıklılıklarının arttığını ortaya koymuştur. Perlit/aljinat oranı=2 (a/a) olduğunda mikrokürelerin adsorpsiyon kapasitesi maksimuma ulaşmış fakat bu orandan fazla perlit ilavesi mikrokürelerin adsorpsiyon kapasitesinde azalmaya neden olmuştur.

Characterization of magnetic alginate/perlite composite microspheres and determination of optimum conditions for the removal of Pb (II) and Ni (II) ions from aqueous solution

The goal of present study is preparation, characterization of magnetic alginate/perlite composite microspheres and to investigate the usability of produced microspheres for the removal of lead and nickel ions from aqueous solution. The effect of perlite concentration, initial metal ion level and the pH of the solution on the heavy metal adsorption capacity of microspheres were investigated. Iron oxide particles were prepared by simple precipitation method. Ionic gelation method was utilized to synthesize the microspheres. Swelling studies showed that addition of perlite to iron oxide-containing micropsheres decreased the swelling degree of the microspheres. SEM analysis indicated that microspheres were almost spherical with rough surface. SEM-EDX showed that alginate/perlite microspheres composed of C, O, Na, Al, Si, K, Cl and Fe. TGA analysis indicated that incorporation of perlite improved the thermal properties of microspheres. Adsorption capacity of microspheres reached the maximum value when the perlite/alginate ratio=2 (wt./wt.), but then adding more than this value significantly decreased the adsorption capacity of microspheres.

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