Tarım Topraklarında Tetrasiklin ve Diklofenak Adsorpsiyonu/Desorpsiyonu için Deneysel Veriler ve Modelleme

Tetrasiklin ve diklofenakın iki farklı tarım toprağına (S1 ve S2) adsorpsiyon-desorpsiyon özellikleri kesikli denge yöntemi kullanılarak araştırılmıştır. Adsorpsiyon deneyleri, tetrasiklin ve diklofenak adsorpsiyonunda iki değişken parametreyi (temas süresi (5-120 dakika), başlangıç kirletici konsantrasyonu (5-300 mg/L)) optimize etmek için kullanılmıştır. Tetrasiklin ve diklofenak için toprak adsorpsiyon kinetiği, hızlı ve yavaş adsorpsiyon oranları ile karakterize edilen iki üslü bir adsorpsiyon modeli ile tanımlanmıştır. Non-linear adsorpsiyon izoterm eğrileri, Langmuir, Freundlich ve Temkin modellerine iyi uyum sağlamıştır. S1 ve S2 topraklarına tetrasiklin ve diklofenakın maksimum adsorpsiyon kapasitesi (qm) sırasıyla 55.90 mg/g, 41.92 mg/g, 26 mg/g ve 6.42 mg/g olarak hesaplanmıştır. Kd, Koc, foc ve qa değerleri hesaplanmıştır. Tetrasiklin ve diklofenakın S1 ve S2 toprakları tarafından adsorpsiyon etkinliği %97'nin üzerindedir. S1 ve S2 topraklarına tetrasiklin ve diklofenak adsorpsiyonu için Kd parametreleri sırasıyla 3537 L/kg, 654 L/kg, 1669 L/kg ve 3105 L/kg olarak bulunmuştur. Adsorpsiyon işleminin tersinebilirliği, farklı konsantrasyonlarda HDTMA ve Triton-x yüzey aktif maddeler kullanılarak desorpsiyon deneyleriyle değerlendirilmiştir. Desorpsiyon oranları diklofenak için tetrasikline göre daha yüksek bulunmuştur.

Anahtar Kelimeler:

Adsorpsiyon, desorpsiyon, diklofenak, tetrasiklin, toprak, Adsorpsiyon, desorpsiyon, diklofenak, tetrasiklin, toprak

Experimental Data and Modeling for the Adsorption/Desorption of Tetracycline and Diclofenac on the Agricultural Soils

The adsorption-desorption characteristics of tetracycline and diclofenac onto two different agricultural soils (S1 and S2) were investigated using the batch equilibrium method. The adsorption experiments were used to optimize the two variable parameters (contact time (5-120 min), initial pollutant concentration (5-300 mg/L)) on the adsorption of tetracycline and diclofenac. The adsorption kinetics for tetracycline and diclofenac onto soil are well described by a bi-exponential adsorption model characterized by fast and slow adsorption rates. Non-linear adsorption curves fitted well to the Langmuir, Freundlich and Temkin equations. The maximum adsorption capacity (qm) of tetracycline and diclofenac onto the soils S1 and S2 were calculated to be 55.90 mg/g, 41.92 mg/g, 26 mg/g and 6.42 mg/g, respectively. Kd, Koc, foc and qa values were calculated. The adsorption efficiency of tetracycline and diclofenac by the soils S1 and S2 was over 97%. The Kd parameters for the adsorption of tetracycline and diclofenac onto the soils S1 and S2 were found to be 3537 L/kg, 654 L/kg, 1669 L/kg and 3105 L/kg, respectively. The reversibility of the adsorption process was evaluated by desorption experiments using different concentrations of HDTMA and Triton-x surfactants. The desorption rates were higher for diclofenac than for tetracycline.

Keywords:

Adsorption, desorption, diclofenac, soil, tetracycline,

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