Removal of Manganese (II) Ions from Aqueous Solutions with Raw Orange Peel: Equilibrium, Kinetic and Thermodynamic Studies

Year 2022, Volume: 22 Issue: 1, 45 - 56, 28.02.2022

Yalçın Altunkaynak , Mutlu Canpolat

https://doi.org/10.35414/akufemubid.1032148

Cited By: 4

Abstract

This study describes the evaluation of raw orange peel (HPK) for removal of Mn2+ ions from aqueous solutions. The effects of different variables such as pH, initial metal ion concentration, contact time and temperature were investigated for adsorption efficiency. It was determined that the best starting concentration was 100 mg/L, the adsorption contact time was 100 minutes, and the solution pH was 5.37 as the most suitable working conditions. The surface properties of the orange peel waste were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy and Fourier transform infrared spectroscopy (FT-IR). The results showed that the isotherm data fit the Langmuir isotherm model (compared to the Freundlich, Dubinin-Radushkevich, and Temkin models) corresponding to chemical adsorption and possible irreversibility of the process. The adsorption capacity for Mn2+ was calculated to be 7.6923, 7.3964 and 8.1632 mg/g at 298, 308 and 318 K, respectively. As a result of the adsorption kinetic data, when the kinetics of the Mn2+ metal ion were examined (Pseudo-first-order, False-second-order, Weber-Morris and Elovich kinetic models), it was determined that its adsorption conformed to the pseudo-second-order kinetic model. Thermodynamic studies showed that the adsorption of Mn2+ ion on orange peel is spontaneous and endothermic. HPK has been found to be an effective and alternative material for the uptake of Mn2+ ions from the aqueous medium due to its high removal capacity, availability and low cost.

Keywords

Adsorption, Orange Peel, Manganese, Kinetic, Isoterm

Ham Portakal Kabuğu ile Sulu Çözeltilerden Mangan (II) İyonlarının Uzaklaştırılması: Denge, Kinetik ve Termodinamik Çalışmalar

Abstract

Bu çalışma, sulu çözeltilerden Mn2+ iyonlarının uzaklaştırılması için ham portakal kabuğunun (HPK) değerlendirilmesini anlatmaktadır. Adsorpsiyon verimi için pH, başlangıç metal iyonu derişimi, temas süresi ve sıcaklık gibi farklı değişkenlerin etkileri araştırıldı. Mn2+ iyonu için, en iyi başlangıç konsantrasyonunun 100 mg/L, adsorpsiyon temas süresinin 100 dakika ve çözelti pH'ının 5.37 olduğu şartların en uygun çalışma koşulları olduğu belirlendi. Portakal kabuğu atığının yüzey özellikleri, taramalı elektron mikroskobu (SEM), enerji dağılımlı spektroskopi ve Fourier dönüşümü kızılötesi spektroskopisi (FT-IR) kullanılarak araştırıldı. Sonuçlar, izoterm verilerinin, kimyasal adsorpsiyona ve işlemin olası tersinmezliğine karşılık gelen Langmuir izoterm modeline (Freundlich, Dubinin- Radushkevich ve Temkin modelleriyle karşılaştırıldığında) uyduğunu gösterdi. Adsorpsiyon kapasitesinin Mn2+ için 298, 308 ve 318 K’de sırasıyla 7.6923, 7.3964 ve 8.1632 mg/g olduğu hesaplanmıştır Adsorpsiyon kinetik verileri sonucunda Mn2+ metal iyonunun kinetiği incelendiğinde, (Yalancı birinci derece, Yalancı ikinci derece, Weber- Morris ve Elovich kinetik modelleri) adsorpsiyonunun Yalanci ikinci derece kinetik modele (pseudo-second-order) uyduğu belirlendi. Termodinamik çalışmalar Mn2+ iyonunun portakal kabuğu üzerine adsorpsiyonunun kendiliğinden ve endotermik olduğunu gösterdi. Atık portakal kabuklarının, yüksek uzaklaştırma kapasitesi, kolay bulunabilirliği, düşük maliyeti, kullanılabilir bir tarımsal atık olması, geri dönüşümü ve çevreye zarar vermemesi gibi nedenlerle sulu ortamdan Mn2+ iyonlarının alınmasında farklı adsorbanlarla karşılaştırıldığında, etkili ve alternatif bir malzeme olduğu görülmüştür.

Keywords

Adsorpsiyon, Portakal Kabuğu, Mangan, Kinetik, İzoterm

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