METİLEN MAVİSİ BOYAR MADDESİNİN SENTETİK ATIKSULARDAN Cu-Alg HİDROJEL BONCUKLAR KULLANILARAK UZAKLAŞTIRILMASI

Öz

Son zamanlarda su kirliliğinde meydana gelen artış, artan çevresel endişeleri de beraberinde getirmektedir. Bu nedenle kirleticilerin sulardan uzaklaştırılması hem çevresel hem de insan sağlığı açısından gün geçtikçe önem kazanmaktadır. Kirleticilerin sulardan uzaklaştırılması için uygulaması kolay ve düşük maliyetli bir yöntem olan adsorpsiyon prosesi yoğun olarak kullanılmaktadır. Adsorpsiyon prosesinde kullanılacak adsorbanların tasarımı ve geliştirilmesi ise araştırmacılar arasında büyük ilgi görmektedir. Bu adsorbanlardan biri de aljinat bazlı hidrojel boncuklardır. Bu çalışmada bakır (II) iyonları ile çapraz bağlanarak elde edilen aljinat hidrojel boncuklar metilen mavisinin sudan uzaklaştırılması için kullanılmıştır. Sodyum aljinat ile bakır (II) iyonları çapraz bağlanarak Cu-Alg adı verilen aljinat hidrojel boncuklar sentezlenmiş ve FTIR ile karakterize edilmiştir. Cu-Alg adsorban olarak kullanılarak kesikli adsorpsiyon prosesi ile metilen mavisinin sudan uzaklaştırılmasına adsorban dozu, pH, sıcaklık, temas süresi ve boya konsantrasyonunun etkisi araştırılmıştır. Denemeler sonucunda 0,1 g/50 mL adsorban dozu, 12 pH seviyesi, 30°C sıcaklık, 120 dakika temas süresi ve 10 mg/L metilen mavisi konsantrasyonu optimum koşullar olarak belirlenmiştir. Bu koşullarda, maksimum metilen mavisi giderimi %90,07 olmuştur. Ek olarak, çeşitli kinetik izoterm modelleri kullanılarak Cu-Alg hidrojel boncuklar üzerine metilen mavisi adsorpsiyonunun kemisorpsiyon ve fizisorpsiyon yoluyla gerçekleştiği gösterilmiştir. Termodinamik analiz ile adsorpsiyon sürecinin ekzotermik ve spontan bir yapı sergilediği ortaya konulmuştur.

Anahtar Kelimeler

• Adsorpsiyon İzotermi
• Adsorpsiyon Kinetiği
• Hidrojel Boncuk
• Metilen Mavisi
• Sodyum Aljinat

REMOVAL OF METHYLENE BLUE DYESTUFF FROM SYNTHETIC WASTEWATER USING Cu-Alg HYDROGEL BEADS

Öz

The recent increase in water pollution brings with it increasing environmental concerns. For this reason, the removal of pollutants from water is becoming increasingly important in terms of both environmental and human health. Adsorption process, which is an easy and low-cost method for the removal of pollutants from water, is used extensively. The design and development of adsorbents to be used in the adsorption process is of great interest among researchers. One of these adsorbents is alginate-based hydrogel beads. In this study, alginate hydrogel beads obtained by crosslinking with copper (II) ions were used for the removal of methylene blue from water. Alginate hydrogel beads called Cu-Alg were synthesized by crosslinking sodium alginate with copper (II) ions and characterized by FTIR. The effect of adsorbent dose, pH, temperature, contact time and dye concentration on the removal of methylene blue from water by batch adsorption process using Cu-Alg as adsorbent was investigated. As a result of the experiments, 0.1 g/50mL adsorbent dose, 12 pH level, 30°C temperature, 120 minutes contact time and 10 mg/L methylene blue concentration were determined as optimum conditions. Under these conditions, the maximum methylene blue removal was 90.07 %. In addition, it was shown that methylene blue adsorption on Cu-Alg hydrogel beads occurs via chemisorption and physisorption using various kinetic isotherm models. Thermodynamic analysis revealed that the adsorption process was exothermic and spontaneous.

Anahtar Kelimeler

• Adsorption Isotherm
• Adsorption Kinetics
• Hydrogel Beads
• Methylene Blue
• Sodium Alginate

Kaynakça

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