Investigation of the removal of tetracycline, a widely used antibiotic, from wastewater by using ulexite-based boron

Abstract

In this study, antibiotic removal mechanism was investigated by using ulexite-derived boron as an alternative to conventional adsorbents. Tetracycline was chosen as the antibiotic, considering its widespread use and the development of antibiotic-resistant microorganisms it causes. Removal mechanisms of tetracyclines were investigated by analyzing reaction isotherms under optimized experimental conditions using boron at different pH, temperature and dosages. Maximum adsorption values for adsorbents were observed in the pH range of 6-7, in the medium containing 0.5 g adsorbent, at 25 oC and in the medium where the initial tetracycline concentration was 50 mg/L. The highest adsorption efficiency of tetracycline for boron was found to be 90.11%. It was observed that the adsorption efficiency decreased with increasing temperature. Thermodynamic parameters, Gibbs free energy (ΔG), entropy (ΔS) and enthalpy (ΔH) values were found. For boron, the negative ΔG values presented at four temperatures showed that the adsorption event occurred spontaneously. The positive value of ΔS indicates that the disorder increases at the solid/liquid interface during the adsorption process, while the negative value indicates that the disorder decreases. The adsorption negative ΔH of the TC processes also showed that the adsorption is exothermic and can be applied spontaneously to the adsorption processes.

Keywords

• Üleksit
• Bor
• Tetrasiklin
• Atıksu kirliliği
• Adsorbsiyon

Üleksit esaslı bor kullanarak atıksulardan yaygın kullanım alanlı bir antibiyotik olan tetrasiklininin giderimininin incelenmesi

Abstract

Bu çalışmanın birinci kısmında, farklı pH, sıcaklık ve dozajlarda tetrasiklin antibiyotiği ile geleneksel adsorbanlara alternatif olarak bor, alümina ve polipropilen giderim mekanizması araştırılmıştır. Optimum deney koşullarında bor, ile reaksiyon kinetiği, reaksiyon izotermleri analiz edilerek tetrasiklinlerin giderim mekanizmaları araştırılmıştır. Adsorbentler için maksimum adsorpsiyon değerleri gözlendiği pH 6-7 aralığında, 0.5 g adsorbent içeren ortamda, 25 oC’ de ve başlangıç tetrasiklin derişimi 50 mg/L’de olduğu ortamda görülmüştür. Bor, alümina için tetrasiklinin en yüksek adsorpsiyon verimi sırayla % 90,11 olarak bulunmuştur. Artan sıcaklıkla adsorpsiyon verimin azaldığı görülmüştür. Termodinamik parametreler, Gibbs serbest enerjisi (ΔG), entropi (ΔS) ve entalpi (ΔH) değerleri bulunmuştur. Bor, için dört sıcaklıkta sunulan negatif ΔG değerleri, adsorpsiyon olayının kendiliğinden gerçekleştiğini göstermiştir. ΔS’nin pozitif değeri adsorpsiyon işlemi sırasında katı/sıvı ara yüzeyinde düzensizliğin arttığını, negatif olması düzensizliğin azaldığını gösterir. TC işlemlerinin adsorpsiyonu negatif ΔH olması da adsorpsiyon ekzotermik olduğunu ve adsorpsiyon proseslerine spontan uygulanabilir olduğunu göstermiştir

Keywords

• Üleksit
• Bor
• Tetrasiklin
• Atıksu kirliliği

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