Removal of Cr(III) from Synthetic Wastewater by using a Strong Cation Exchange Resin

Abstract

Cr(III), is toxic heavy metal present in wastewaters from a variety of industries. In this study,
chromium removal was investigated using ion exchange method from aqueous solutions. For this purpose, strong
cation exchanger resin Dowex 88 was used as sorbent. During the experimental studies, the effect of parameters
such as pH, temperature, resin dosage and sorption time on chromium removal was observed. Thermodynamic,
isotherm and kinetic studies were also performed. In the isotherm studies, Langmuir and Freundlich isotherm
models were applied and it was occured that the experimental data ft to both isotherm models. Thermodynamic
results showed that the chromium sorption onto Dowex 88 resin had exothermic and spontaneous. As a result of the
kinetic studies observed that the sorption data follows frst-order reversible kinetics.

Keywords

• Cr(III),Dowex 88,ion exchange,isotherm,thermodynamics

Güçlü Bir Katyon Değişim Reçinesi Kullanarak Sentetik Atıksudan Cr(III)’ün Giderimi

Abstract

Cr(III), çeşitli endüstriyel atıksularda var olan toksik ağır metallerden biridir. Bu çalışmada sulu
çözeltilerden krom giderimi iyon değişimi yöntemiyle araştırılmıştır. Bu amaçla sorbent olarak güçlü bir katyon
değiştirici reçine olan Dowex 88 kullanılmıştır. Deneysel çalışmalarda pH, sıcaklık, reçine miktarı ve sorpsiyon
süresi gibi parametrelerin krom giderimine etkisi incelenmiştir. Ayrıca, termodinamik, izoterm ve kinetik çalışmalar
yapılmıştır. İzoterm çalışmalarında Langmuir ve Freundlich izoterm modelleri denenmiş ve deneysel verilerin her
iki izoterm modeline de uyduğu görülmüştür. Termodinamik sonuçlar, Dowex 88 reçinesine krom sorpsiyonunun
ekzotermik ve kendiliğinden gerçekleştiğini göstermiştir. Kinetik çalışmalar sonucunda ise sorpsiyon verilerinin
tersinir birinci mertebe kinetik modele uyduğu gözlenmiştir.

Keywords

• Cr(III),Dowex 88,iyon değişimi,izoterm,termodinamik

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