Asit turuncu II boyasının kitosan ve zirkonyum(IV)-kitosan üzerine adsorpsiyonunun karşılaştırılması

Year 2018, Volume: 24 Issue: 7, 1298 - 1303, 28.12.2018

Pelin Demirçivi

Abstract

Yaygın
olarak kullanılan bir biyopolimer olan kitosanın (Cht)   adsorpsiyon kapasitesini arttırmak amacıyla
zirkonyum (IV)-kitosan (Zr(IV)-Cht) kompoziti sentezlenmiş ve asit turuncu II
(T-II) sentetik boyası kullanılarak Cht ile adsorpsiyon kapasiteleri
karşılaştırılmıştır. Kesikli sistemde yapılan denemelerde Zr(IV) miktarı,
çözelti pH’ı, adsorban miktarı, temas süresi ve sıcaklıklığın T-II
adsorpsiyonuna olan etkileri incelenmiştir. Langmuir, Freundlich ve Temkin
izoterm modelleri denenerek elde edilen deneysel verilere en uygun cevap veren
izoterm modelinin Langmuir izoterm modeli olduğu bulunmuştur. Maksimum
adsorpsiyon kapasiteleri sırasıyla Cht için 256.41 mg/g ve Zr(IV)/Cht için
666.67 mg/g olarak bulunmuştur. Kinetik veriler yalancı-birinci dereceden ve
yalancı-ikinci dereceden kinetik modellerine uygulandığında yalancı-ikinci
dereceden kinetik modelinin en uygun olduğu sonucuna varılmıştır. Termodinamik
veriler ışığında, T-II adsorpsiyonunun hem Cht, hem de Zr(IV)/Cht için
endotermik olarak kendiliğinden gerçekleşen bir işlem olduğu belirlenmiştir.
Adsorpsiyon/desorpsiyon denemelerinde yedinci döngü sonunda  Cht’ın adsorpsiyon kapasitesi %65,
Zr(IV)-Cht’ın adsorpsiyon kapasitesinin %95 olduğu bulunmuştur. T-II
adsorpsiyonu için sentezlenen Zr(IV)-Cht kompoziti yüksek adsorpsiyon
kapasitesine sahip, ucuz ve toksik olmayan bir adsorban olarak boya gideriminde
kullanılabileceği sonucuna varılmıştır.

Keywords

Zirkonyum, Kitosan, Asit turuncu II, Adsorpsiyon

Comparison of adsorption of acid orange II dye on chitosan and zirconium(IV)-chitosan

Abstract

To
increase the adsorption capacity of chitosan (Cht), which is an abundant
biopolymer, zirconium (IV)-chitosan (Zr(IV)-Cht) composite was synthesized and
adsorption capacity was compared with Cht using acid orange II (T-II). Batch studies were conducted to analyze the effect of
Zr (IV) loading amount, solution pH, adsorbent dosage, contact time and
temperature on T-II adsorption. The best responding isotherm model to the
experimental data was found Langmuir
adsorption isotherm model by analyzing Langmuir, Freundlich and
Temkin isotherm models. The
maximum adsorption capacities were found as 256.41 mg/g and 666.67 mg/g for Cht and Zr(IV)-Cht, respectively. Application of kinetic data
to the pseudo-first order and pseudo-second order kinetic models, pseudo-second
order model was the best-fitted model for the kinetic data. The adsorption
process was found endothermic and spontaneously occurred for both Cht and
Zr(IV)-Cht. According to adsorption/desorption experiments, after seventh cycle
adsorption capacities were found 65% for Cht and 95% for Zr(IV)-Cht. The
synthesized Zr(IV)-Cht composite was found as the high adsorption capacity,
low-cost and non-toxic material for T-II adsorption and can be used for dye
adsorption.

Keywords

Zirconium, Chitosan, Acid orange II, Adsorption

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