Synthesis of Magnetic Activated Carbon / ZnO Composite and Equilibrium and Kinetics Application on the Removal of Dyestuff

Abstract

In this study, activated carbon was prepared by chemical activation from waste rubber, and then magnetic activated carbon/ZnO nanocomposites were synthesized by single step thermal method. The equilibrium and kinetic study of dye adsorption in aqueous solution of synthesized composites was investigated. Physicochemical properties and characterization of nanocomposites were determined by nitrogen adsorption, SEM-EDAX and XRD. Adsorption capacities of five different magnetic activated carbon / ZnO nanocomposites were calculated by applying Langmuir and Freundlich isotherm models for Malachite green (MY) in aqueous solution. According to the results, the highest adsorption capacity was found to be 502.5 mg/g in the magnetic nanocomposite produced by hexamethylene tetraamine (HMTA) and ZnCl2. First and second order kinetic models were used for adsorption kinetics. Accordingly, five nanocomposites were found to match the pseudo-first-order kinetics.

Keywords

• Activated carbon,Magnetic composite,ZnO,Dye removal,, Kinetic

Manyetik Aktif Karbon/ZnO kompozitinin Sentezlenmesi ve Boyar Madde Giderimi Üzerine Denge ve Kinetik Uygulaması

Öz

Bu çalışmamızda, atık kauçuktan kimyasal aktivasyonu ile aktif karbon, ardından da tek basamakta termal yöntem ile manyetik aktif karbon/ZnO nanokompozitleri sentezlenmiştir. Sentezlenen kompozitlerin sulu çözeltide boyar madde adsorpsiyon denge ve kinetik çalışmaları incelenmiştir. Nanokompozitlerin fizikokimyasal özellikleri ve karakterizasyonu azot adsorpsiyonu, SEM-EDAX ve XRD ile belirlenmiştir. Beş farklı manyetik aktif karbon/ZnO nanokompozitlerinin sulu çözeltide Malahit yeşili (MY) için Langmuir ve Freunlich izoterm modelinde uygulanarak adsorpsiyon kapasiteleri belirlenmiştir. Elde edilen sonuçlara göre en yüksek adsorpsiyon kapasitesi hekza metilen tetra amin (HMTA) ve ZnCl2 ile üretilen manyetik nanokompozitte 502.5 mg/g olarak bulunmuştur. Adsorpsiyon kinetiği için birinci ve ikinci mertebe kinetik modeller kullanılmıştır. Yapılan kinetik çalışmalarda beş nanokompozitinde birinci dereceden hız sabitine uyduğu bulunmuştur.

Anahtar Kelimeler

• Aktif Karbon,ZnO,Manyetik kompozit,Boya giderimi, Kinetik

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