Krom(VI) İyonlarının Adsorpsiyonunda Deniz Çayırlarından Üretilen Aktif Karbonun Kullanımı

Yıl 2024, , 2128 - 2142, 15.12.2024

Kadriye Esen Erden

https://doi.org/10.31466/kfbd.1526347

Öz

Bu araştırmada, deniz çayırı olarak da bilinen Posidonia oceanica'dan elde edilen aktif kömür (PO-AK) adsorban olarak kullanılarak ağır metal Cr (VI) iyonlarının adsorpsiyonu temas süresi, başlangıç konsantrasyonu, pH, sıcaklık, adsorban dozajı gibi değişen parametreler ışığında incelenmiştir. Cr (VI) iyonlarının adsorpsiyon mekanizmasında çözelti pH'sı önemli bir parametre olup; çalışmada Cr (VI) iyonlarının PO-AK ile adsorpsiyonunda en etkili pH değeri 2.0 olarak tespit edilmiştir. Çalışmada elde edilen verilerden standart Gibbs serbest enerjisi (∆G0), standart entalpi (∆H0) ve standart entropi (∆S0) değerleri hesaplanmış; sırasıyla -20.06 kJ mol-1, -32.40 kJ mol-1 ve -0.04 kJ mol-1 olarak bulunmuştur. Adsorpsiyon sürecinde sistem sıcaklığının yükselmesiyle adsorpsiyon veriminin düştüğü ve adsorpsion reaksiyon mekanizmasının ekzotermik olarak gerçekleştiği tespit edilmiştir. İncelenen konsantrasyon etkisinden elde edilen veriler Langmuir, Freundlich ve Temkin izotermlerine uygunluk göstermiştir. Bu çalışmadan elde edilen sonuçlara göre gerekli optimum koşullar sağlandığında, sulu çözeltilerden Cr (VI) iyonlarının gideriminde Posidonia oceanica’dan elde edilen aktif kömürün adsorplama kabiliyetinin oldukça yüksek (%98) olduğu bulunmuştur.

Anahtar Kelimeler

Krom, Adsorpsiyon, Deniz Çayırı, Posidonia oceanica, Aktif Karbon

Etik Beyan

Yapılan çalışmada araştırma ve yayın etiğine uyulmuştur.

Teşekkür

Deneysel çalışmaların gerçekleştirilmesinde kullanılan cihazlar için sağladıkları destek ve katkılarından dolayı Pamukkale Üniversitesi Fen Fakültesi Kimya Bölümü ve Doç. Dr. Ramazan Donat’a teşekkür ederim.

Use of Activated Carbon Produced from Seagrasses in the Adsorption of Chromium (VI) Ions

Öz

In this study, activated carbon (PO-AC) derived from Posidonia oceanica, also known as seagrass, was used as an adsorbent to investigate the adsorption of the heavy metal Cr (VI) ions under varying parameters such as contact time, initial concentration, pH, temperature, and adsorbent dosage. pH of the solution is a crucial parameter in the adsorption mechanism of Cr (VI) ions, and the most effective pH value for the adsorption of Cr (VI) ions with PO-AC was found to be 2.0. From the data obtained in the study, the standard Gibbs free energy (∆G°), standard enthalpy (∆H°), and standard entropy (∆S°) values were calculated as -20.06 kJ mol⁻¹, -32.40 kJ mol⁻¹, and -0.04 kJ mol⁻¹, respectively. It was determined that the adsorption efficiency decreased with an increase in system temperature and that the adsorption reaction mechanism occurred exothermically. The data obtained from the concentration effect showed compliance with both Langmuir, Freundlich and Temkin isotherms. According to the results obtained from this study, it was found that the adsorption ability of activated charcoal obtained from Posidonia oceanica in the removal of Cr (VI) ions from aqueous solutions is quite high (98%) when the necessary optimum conditions are provided.

Anahtar Kelimeler

Chromium, Adsorption, Seagrass, Posidonia oceanica, Activated Carbon

Kaynakça

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