Investigation Effects of Activating Agent Types on Methylene Blue Adsorption with Using Isotherm and Kinetic Models

Öz

Three different activated carbons were obtained from waste olive stones through activation with KOH (basic), ZnCl₂ (neutral), and H₃PO₄ (acidic), respectively. This study aimed to specify the effects of various activating agent types on the methylene blue dye adsorption mechanism. Adsorption experiments of methylene blue were conducted using these activated carbons to investigate their effects on removal mechanisms and adsorption chemistry. The kinetic and isotherm data obtained were used to determine the removal mechanisms of methylene blue and the pollutant–adsorbent interactions. It was found that KOH activation led to the formation of a high number of active sites on the activated carbon surface, whereas ZnCl₂ and H₃PO₄ activation resulted in the presence of an adsorption-resistant layer on the surface. This resistance layer was observed to be thicker in H₃PO₄ activation, leading to greater resistance to methylene blue adsorption. Additionally, it was concluded that the activated carbons obtained with all three activation chemicals exhibited both chemical and reversible adsorption.

Anahtar Kelimeler

• Activated carbon
• Pyrolysis
• Adsorption

Aktivasyon Kimyasalı Türlerinin Metilen Mavisi Adsorpsiyonuna Etkilerinin İzoterm ve Kinetik Modelleri Kullanılarak İncelenmesi

Öz

Bu çalışmada, bazik, nötr ve asidik olmak üzere sırasıyla KOH, ZnCl2, H3PO4 aktivasyon kimyasalları ile aktivasyon işlemine tabi tutulan atık zeytin çekirdeklerinden 3 farklı aktif karbon eldesi gerçekleştirilmiştir. Mevcut çalışma ile aktif karbon eldesinde kullanılan aktivasyon kimyasallarının türü ve tipinin metilen mavisi adsorpsiyon mekanizmasına etkilerinin belirlenmesi amaçlanmıştır. Sentezlenen aktif karbonlarla metilen mavisinin adsorpsiyon çalışmaları gerçekleştirilerek giderim mekanizmalarına ve kimyasına etkileri incelenmiştir. Elde edilen kinetik ve izoterm verileri ile de metilen mavisi giderimindeki mekanizmalar ve kirletici-adsorban ilişkileri belirlenmiştir. KOH aktivasyonunun aktif karbon yüzeyinde yüksek miktarda aktif bölge oluşumu sağladığı, ZnCl2 ve H3PO4 aktivasyonlarında ise aktif karbon yüzeyinde adsorpsiyona direnç gösteren bir tabaka varlığı olduğu tespit edilmiştir. Direnç tabakasının H3PO4 aktivasyonunda ise daha kalın olduğu ve metilen mavisi adsorpsiyonuna daha yüksek direnç gösterdiği belirlenmiştir. Ayrıca, üç aktivasyon kimyasalıyla da elde edilen aktif karbonlar ile kimyasal ve tersinir adsorpsiyon gerçekleştirildiği sonucuna ulaşılmıştır.

Anahtar Kelimeler

• Aktif karbon
• Piroliz
• Adsorpsiyon

Kaynakça

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