Sulu Çözeltide Tetrasiklin Giderimi için Fındık ve Antep Fıstığı Kabuklarının Eş-karbonizasyonundan Elde Edilen Yeni Hidrokömürün Kullanımı

Öz

Bu çalışmada, fındık ve fıstık kabuklarının (HS ve PS) kombine hidrotermal karbonizasyonu (ko-HTK) ile üretilen yeni bir hidrokömürün (HSPSHC), tetrasiklin (TC) antibiyotiğinin sudan uzaklaştırılmasında sorbent malzeme olarak kullanımı araştırılmıştır. HSPSHC, fındık ve fıstık kabuklarının 220 oC'de 6 saat boyunca kütlece 1:1 oranında karıştırılmasıyla hidrotermal karbonizasyonundan elde edildi. HSPSHC için kütle verimi, enerji yoğunluğu ve üst ısıl değer parametreleri hesaplandı ve yüzey kimyası, Fourier dönüşümü kızılötesi spektroskopisi (FTIR) kullanılarak karakterize edildi. HSPSHC üzerinde TC adsorpsiyonu, kesikli yöntem kullanılarak kinetik ve izoterm çalışmaları ile gerçekleştirildi. Deneysel kinetik sonuçlar yalancı birinci dereceden (PFO) ve ikinci dereceden (PSO) kinetik denklemlerinde değerlendirildi ve adsorpsiyonun PSO kinetiğine uyduğu görüldü. Deneysel olarak elde edilen sonuçlar Langmuir ve Freundlich model denklemlerine uygulanarak izoterm modellemesi yapıldı. Hazırlanan hidrokömür üzerindeki TC'nin adsorpsiyon izotermi, HSPSHC hidrokömürü üzerinde 323 K'de ve pH 4,0'da qm: 137,06 mg/g'lik maksimum tek katmanlı TC adsorpsiyon kapasitesi sağlayan Langmuir denklemiyle iyi bir şekilde uymuştur. Ek olarak termodinamik çalışmalar, TC'nin HSPSHC tarafından adsorpsiyonunun kendiliğinden ve endotermik bir süreç olduğunu ortaya çıkardı.

Anahtar Kelimeler

• Hidrotermal ko-karbonizasyon
• Fındık ve fıstık kabukları
• Ürün karakterizasyonu
• Tetrasiklin
• Giderim

Use of Novel Hydrochar from Co‑carbonization of Hazelnut and Pistachio Shells for Tetracycline Removal from Aqueous Solution

Öz

In present work, the use of a new hydrochar (HSPSHC) produced by the combined hydrothermal carbonization (co-HTC) of hazelnut and pistachio shells (HS and PS) as a sorbent material in tetracycline (TC) antibiotic removal from water was investigated. It was obtained from hydrothermal carbonization of HSPSHC, hazelnut and pistachio shells by mixing 1:1 by mass at 220 oC for 6 h. Mass yield, energy density and higher heating value parameters were calculated for HSPSHC, and the surface chemistry was characterised using Fourier transform infrared spectroscopy (FTIR). TC adsorption on HSPSHC was carried out by kinetic and isotherm studies using batch method. The experimental kinetic results were qualified in pseudo first-order (PFO) and second-order (PSO) kinetic equations and it was observed that the adsorption complied with the PSO kinetics. The experimentally obtained results were applied to Langmuir and Freundlich model equations and isotherm modeling was performed. The adsorption isotherm of TC on the prepared hydrochar was well fitted by the Langmuir equation, which yielded a maximum monolayer adsorption capacity of TC of qm: 137.06 mg/g at 323 K and pH 4.0 on the HSPSHC hydrochar. In addition, thermodynamic studies revealed that the adsorption of TC by HSPSHC is spontaneous and is an endothermic process.

Anahtar Kelimeler

• Hydrothermal co-carbonization
• Hazelnut and pistachio shells
• Product characterization
• Tetracycline
• Removal

Kaynakça

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