Modifiye Edilmiş Pomza Kullanılarak Sulu Ortamlardan Adsorpsiyon Prosesi ile Arsenat (V) Giderimi

Year 2019, Volume: 23 Issue: 2, 356 - 366, 25.08.2019

Bülent Kırkan , Mustafa Bekaroğlu

https://doi.org/10.19113/sdufenbed.467165

Cited By: 4

Abstract

Bu çalışmada, adsorpsiyon yöntemi ile sulu ortamdan As(V) giderimi için
ham ve yüzeyi modifiye edilmiş pomzanın etkinliği incelenmiştir. Granüler
destek malzemesi olarak Isparta pomzası kullanılmış ve demir oksit ile
kaplanmıştır. Katı
sorbentlerinin yapı karakterizasyonunun belirlenmesi için FTIR, XRD ve BET
yüzey alanı analizi yapılmış ve yüzey morfolojisinin gözlenmesi için SEM
görüntüleri kullanılmıştır. HIP ve DOKIPkatı sorbentleri kullanılarak sulu çözeltiden
As(V) giderimini etkileyen çözelti pH’ı, başlangıç As(V) konsantrasyonu, temas
süresi, adsorbent dozu ve sıcaklık parametreleri incelenmiş ve optimum giderim
koşulları tespit edilmiştir. DOKIPiçin maksimum As(V) giderimi ve adsorpsiyon kapasitesi
sırasıyla % 95,99±1,43 ve 1,92±0,03 mg/g olarak elde edilmiştir. DOKIP ile
As(V) adsorpsiyonu için ΔH, ΔS ve ΔG termodinamik parametreleri hesaplanmış,
adsorpsiyon prosesinin ekzotermik karakterli olduğu belirlenmiştir. Deneysel
adsorpsiyon verilerinin Langmuir, Freundlich ve Dubinin-Radushkevich (D-R)
izotermlerine uygunluğu incelenmiş ve adsorpsiyon
verilerinin Langmuir modeline uyduğu belirlenmiştir. Yüksek
adsorpsiyon kapasitelerine dayanarak, sulu çözeltilerden As (V)'in
önderiştirilmesi ve gideriminde DOKIPsorbenti umut verici
alternatif bir adsorban olarak önerilmiştir.

Keywords

Arsenat (V), Katı faz ektraksiyonu, Pomza, Adsorpsiyon, Demir oksit

Removal of Arsenate (V) by Adsorptıon Process from Aqueous Media Using Modified Pumice

Abstract

In this study, the efficiency of row and surface
modified pumice was investigated for As (V) removal from aqueous media by
adsorption method. Isparta pumice is used as granular support material and
coated with iron oxides. FTIR, XRD and BET
surface area analysis were performed for determination of solid sorbents
structure characterization and SEM images were used for observation of surface
morphology. The
impacts of pH, initial As(V) concentration, contact time, adsorbent dose and
temperature  on As(V) removal were
studied with using HIP and DOKIP as adsorbent and optimum removal conditions
have been determined.  The maximum As(V)
removal and adsorption capacity of DOKIP-1 were 95.99±1.43 % and 1.92±0.03
mg/g, respectively. The
ΔH, ΔG and ΔS thermodynamic parameters for As(V) adsorption of  DOKIP are calculated and results showed that
the adsorption process has exothermic character.
The Langmuir, Freundlich and Dubinin–Radushkevich (D-R)
isotherms were used to fit the equilibrium data. Langmuir model
resulted in the best fit of the adsorption data. Based on high adsorption capacities, DOKIP sorbent has
been proposed as a promising alternative adsorbent in the preconcentration and
removal of As (V) from aqueous solutions.

Keywords

Arsenate (V), Solid phase extraction, Pumice, Adsorption, Iron oxide

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