Removal of Crystal Violet Dye from Aqueous Solution Using Biochar Obtained from Oleaster Seeds

Öz

In this study, the removal of biochar (EAL) obtained from oleaster seeds (elaeagnus angustifolia L.) and crystal violet (CRV) dye, which is a cationic dye, widely used in the industry, was carried out with different parameters. Adsorption values and thermodynamic parameters accordance with the isotherms and kinetics were evaluated with the help of temperature, concentration change, amount of adsorbent, pH and time changes. Temperature, pH, time, amount of adsorbent and concentration parameters on EAL-KRV adsorption were .investigated according to the shake/batch adsorption method. Obtained results indicated that the maximum adsorption capacity qmax of EAL-CRV was 10.537 mg/g. It was found that the process proceeds over the pseudo-second order, is endothermic, and conforms to the Langmuir adsorption isotherm. Obtained negative ΔG° values led to the conclusion that EAL is suitable for CRV removal. When EAL was evaluated together with similar adsorbents used for CRV removal in the literature, the maximum adsorption capacity value of EAL was found close to some studies. When all the results were evaluated, it was concluded that EAL can be used in the removal of CRV dye from aqueous solutions.

Anahtar Kelimeler

• Adsorption
• elaeagnus angustifolia L.
• crystal violet
• Langmuir
• isotherms

İğde Çekirdeklerinden Elde Edilen Biyokömür Kullanılarak Sulu Çözeltiden Kristal Viyole Boyarmaddesinin Uzaklaştırılması

Öz

Bu çalışmada iğde çekirdeklerinden (elaeagnus angustifolia L.) elde edilen biyökömür (EAL) ile katyonik bir boya olan ve endüstride yaygın olarak kullanılan kristal viyole (KRV) boyarmaddesinin sulu çözeltiden giderimi farklı parametreler ile yapılmıştır. Sıcaklık, konsantrasyon, adsorban miktarı, pH ve zaman değişimleri sonucu elde edilen adsorpsiyon değerleri, denge izotermleri, termodinamik ve kinetik açıdan değerlendirilmiştir. Çalkalamalı/kesikli adsorpsiyon metoduna göre sıcaklık, pH, zaman, adsorban miktarı ve konsantrasyon parametrelerinin EAL-KRV adsorpsiyonu üzerindeki etkileri incelenmiştir. Elde edilen sonuçlardan EAL-KRV için maksimum adsorpsiyon kapasitesi qmaks=10.537 mg/g bulunmuştur. Prosesin yalancı-ikinci-derece üzerinden ilerlediği, endotermik olduğu ve prosesin Langmuir adsorpsiyon izotermine uyduğu bulunmuştur. Elde edilen negatif ΔG° değerleri, prosesin kendiliğinden, istemli olarak gerçekleştiğini göstermiştir. EAL, literatürde KRV giderimi için kullanılan benzer adsorbanlarla birlikte değerlendirildiğinde EAL’nin maksimum adsorpsiyon kapasitesi değeri bazı çalışmalara yakın bulunmuştur. Tüm sonuçlar değerlendirildiğinde EAL'nin sulu çözeltilerden KRV boyarmaddesinin gideriminde kullanılabileceği sonucuna ulaşılmıştır.

Anahtar Kelimeler

• Adsorpsiyon
• elaeagnus angustifolia L.
• kristal viyole
• langmuir
• izotermler

Kaynakça

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