Removal of Rhodamine 6G from Aqueous Solutions by Adsorption Method with Elm (Ulmus glabra) and Mulberry (Morus alba) Sawdust

Öz

In the present study, the utilization of natural elm (Ulmus glabra) (UGT) and mulberry sawdust (Morus alba) (MAT) as low cost and effective adsorbents in the removal of Rhodamine 6G (R6G), a cationic dye that has a toxic effect on living metabolism, from water and wastewater has been investigated. UGT and MAT, which were used for the first time in the literature as adsorbent in the removal of R6G, have been characterized by various methods. Adsorption experiments have been carried out by batch system and the effects of experimental parameters such as initial aqueous solution pH, equilibrium time, and initial R6G concentration on the adsorption efficiency of R6G have been evaluated. It was observed that the optimum aqueous solution pH was 7.0 and the equilibrium time was 180 minutes for the adsorption of R6G on both adsorbents. Several kinetics (pseudo first and second order kinetic models and intraparticle diffusion model) and isotherm models (Langmuir, Freundlich, Temkin and Dubinin-Radushkevich) have been applied to the experimental data obtained in order to elucidate the adsorption mechanism. It was found that the adsorption kinetics followed the pseudo second order kinetic model and the experimental data showed good agreement with both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of UGT and MAT has been calculated as 50.5 and 31.8 mg g-1, respectively, using the Langmuir isotherm model. As a result of the study, it has been seen that elm and mulberry sawdust can be an effective and low cost alternative to be used in dyestuff removal.

Anahtar Kelimeler

• Adsorption
• mulberry sawdust
• isotherm
• elm sawdust
• kinetic
• Rhodamine 6G

Karaağaç (Ulmus glabra) ve Dut (Morus alba) Talaşı ile Sulu Çözeltilerden Adsorpsiyon Yöntemiyle Rodamin 6G Giderimi

Öz

Bu çalışmada, canlı metabolizmasında toksik etki gösteren katyonik yapıda boyarmadde olan Rodamin 6G’nin (R6G) sulardan ve atık sulardan uzaklaştırılmasında doğal karaağaç (Ulmus glabra) (UGT) ve dut (Morus alba) (MAT) talaşlarının ucuz ve etkili adsorbanlar olarak kullanılabilirliği araştırılmıştır. R6G’nin gideriminde adsorban olarak literatürde ilk defa bu çalışmada kullanılan UGT ve MAT çeşitli yöntemlerle karakterize edilmiştir. Adsorpsiyon deneyleri kesikli sistemle yürütülmüş olup, R6G’nin adsorpsiyon verimi üzerine başlangıç sulu çözelti pH’ı, denge süresi ve başlangıç R6G konsantrasyonu gibi deneysel parametrelerin etkileri incelenmiştir. R6G’nin her iki adsorban üzerine adsorpsiyonu için optimum sulu çözelti pH’ının 7.0 ve denge süresinin 180 dakika olduğu görülmüştür. Adsorpsiyon mekanizmasının aydınlatılabilmesi için elde edilen deneysel verilere çeşitli kinetik (yalancı birinci ve ikinci mertebeden kinetik model ile parçacık içi difüzyon modeli) ve izoterm modelleri (Langmuir, Freundlich, Temkin ve Dubinin-Radushkevich) uygulanmıştır. Adsorpsiyon kinetiğinin, ikinci mertebeden kinetik modeli takip ettiği ve deneysel verilerin hem Langmuir hem de Freundlich izoterm modellerine iyi bir uyum gösterdiği tespit edilmiştir. UGT ve MAT’in maksimum adsorpsiyon kapasitesi Langmuir izoterm modeli kullanılarak sırasıyla 50.5 ve 31.8 mg g-1 olarak hesaplanmıştır. Yapılan çalışma sonucunda karaağaç ve dut talaşının boyarmadde gideriminde kullanılacak etkili ve düşük maliyetli alternatifler olabileceği görülmüştür.

Anahtar Kelimeler

• Adsorpsiyon
• dut talaşı
• izoterm
• karaağaç talaşı
• kinetik
• Rodamin 6G

Kaynakça

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