Using α-Fe2O3 Nanoparticles as an Adsorbent to Remove Orange G from Aqueous Solutions: Adsorption, Kinetic and Thermodynamic Properties

Abstract

One of the most important sources of environmental pollution is dyestuff waste released to the environment by industrial wastewater. Orange G (OG), one of the dyes frequently used in the industry, was adsorbed with α-Fe2O3 nanoparticles synthesized by the hydrothermal method. The characterization of synthesized α-Fe2O3 nanoparticles was determined by SEM-EDS and XRD analysis. For adsorption studies, the effects of contact time, pH, initial dye concentration, adsorbent amount, and temperature were investigated. As a result of the experiments, the optimum equilibration time was defined as 180 minutes and the optimum pH value was determined as 6.5. It was found that the most suitable isotherm model for the equilibrium data obtained from the adsorption of OG on α-Fe2O3 nanoparticles was the Freundlich model and the most suitable kinetic model was the pseudo-second-order model. With the result of the Langmuir model, it was determined that the maximum single layer adsorption capacity was 334 mg/g. With the thermodynamic studies It was evaluated that the adsorption of OG to α-Fe2O3 nanoparticles was endothermic, physical adsorption occurred and the adsorption event occurred by itself. As a result, it was demonstrated that α-Fe2O3 nanoparticles have great potential for the removal of dyestuffs from wastewater released as industrial waste.

Keywords

• α-Fe2O3
• Orange G
• Adsorption
• Isotherm
• Kinetics
• Thermodynamics

Orange G’nin Sulu Çözeltilerden Uzaklaştırılması için α-Fe2O3 Nanopartiküllerinin Adsorban Olarak Kullanılması; Adsorpsiyon, Kinetik ve Termodinamik Özellikleri

Öz

Çevre kirliliğinin en önemli kaynaklarından biri de endüstriyel atık sularıyla çevreye salınan boyarmadde atıklarıdır. Endüstride sıklıkla kullanılan boyalardan biri olan Orange G (OG), hidrotermal yöntemle sentezlenmiş α-Fe2O3 nanopartikülleri yardımıyla adsorpsiyon işlemine tabi tutulmuştur. Sentezlenen α-Fe2O3 nanopartiküllerinin karakterizasyonu SEM-EDS ve XRD analizleri ile belirlenmiştir. Adsorpsiyon çalışmaları için, temas süresinin, pH’ın, başlangıç boya konsantrasyonunun, adsorban miktarının ve sıcaklığın etkisi incelenmiştir. Yapılan denemeler sonucunda optimum dengelenme süresi 180 dakika ve optimum pH değeri 6,5 olarak belirlenmiştir. OG’nin α-Fe2O3 nanopartikülleri üzerinde adsorpsiyonundan elde edilen denge verilerine en uygun izoterm modelinin Freundlich modeli ve en uygun kinetik modelin yalancı ikinci mertebe modeli olduğu bulundu. Langmuir modeli yardımıyla maksimum tek tabakalı adsorpsiyon kapasitesinin 334 mg/g olduğu belirlendi. Termodinamik çalışmalarla, OG’nin α-Fe2O3 nanopartiküllerine adsorpsiyonunun endotermik olduğu, fiziksel adsorpsiyonun meydana geldiği ve adsorpsiyon olayının kendiliğinden gerçekleştiği sonucuna varıldı. Sonuç olarak, α-Fe2O3 nanopartiküllerinin endüstriyel atık olarak çevreye salınan atık sulardaki boyarmaddelerin uzaklaştırılması için büyük bir potansiyele sahip olduğu ortaya konuldu.

Anahtar Kelimeler

• α-Fe2O3
• Orange G
• İzoterm
• Kinetik
• Termodinamik

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