Ti/IrO2/RuO2 Anot ve Paslanmaz Çelik Katot Kullanılarak Elektrooksidasyon Prosesi ile Metilen Mavisi Boyası Giderimi: İşletme Parametrelerin Rolü

Öz

Bu çalışma, sentetik olarak hazırlanmış atık sudan Metilen Mavisi boyasının anot malzemesi olarak Ti/IrO2/RuO2 ve katot malzemesi olarak paslanmaz çelik kullanılarak laboratuvar ölçekli bir elektrooksidasyon prosesi (EOP) ile giderimini araştırmak için yapılmıştır. Atıksuyun başlangıç pH değeri (3.0, doğal pH (≈ 5.0), 7.0, 9.0 ve 11.0), akım yoğunluğu (1.0 mA cm-2, 1.5 mA cm-2, 2.0 mA cm-2 ve 2.5 mA cm-2), destek elektrolit türü (NaCI, KCI, Na2SO4 ve NaNO3) ve destek elektrolit konsantrasyonu (1.0 mM, 1.5 mM, 2.0 mM ve 2.5 mM) dahil olmak üzere proses değişkenlerinin Metilen Mavisi boya giderme verimliliği üzerindeki etkisi incelenmiştir. 30 dakikalık elektrokimyasal işlemde, Metilen Mavisi boyasının gideriminde en yüksek giderim (%78.31) doğal pH değerinde (≈5) elde edilmiştir. Destek elektrolit türü olarak %78.31’lik giderim verimi ile NaCI en iyi destek elektrolit olarak belirlendikten sonra, NaCI’nın konsantrasyonunun 1.0 mM’den 2.5 mM’ye çıkarılmasıyla giderim verimi %78.31’den %88.25’e kadar yükselmiştir. Giderimde etkisi incelenen son parametre olarak akım yoğunluğunun 1 mA cm-2’den 2.5 mA cm-2’ye artırılmasıyla Metilen Mavisi boya giderim verimi %78.31’den %88.98’e kadar artış görülmüştür. Deneysel sonuçlar Ti/IrO2/RuO2 anot kullanarak Metilen Mavisi boyasının etkin bir şekilde giderilmesinde elektrooksidasyon prosesinin uygunluğunu ortaya koymuştur. Özellikle dolaylı oksidasyonda Metilen Mavisi boyasının sadece redoks aracıları olarak görev yapan klorür iyonlarının varlığında elektroliz edildiği ve reaksiyonun klorür konsantrasyonundan ve uygulanan akım yoğunluğundan etkilendiği belirlenmiştir.

Anahtar Kelimeler

• Metil mavisi
• elektrooksidasyon
• akım yoğunluğu
• destek elektrolit türü
• destek elektrolit konsantrasyonu

Methylene Blue Removal by Electrooxidation Process Using Ti/IrO2/RuO2 Anode and Stainless Steel Cathode: The Role of Operating Parameters

Öz

This study was carried out to investigate the removal of Methyl Blue dye from synthetically prepared wastewater by a lab-scale electrooxidation process using Ti/IrO2/RuO2 as the anode material and stainless steel as the cathode material. The effect of operating variables, including wastewater initial pH (3.0, natural pH (≈ 5.0), 7.0, 9.0, and 11.0), current density (1.0 mA cm-2, 1.5 mA cm-2, 2.0 mA cm-2, and 2.5 mA cm-2), type of support electrolyte (NaCI, KCI, Na2SO4, and NaNO3), and concentration of support electrolyte (1.0 mM, 1.5 mM, 2.0 mM, and 2.5 mM) on Methyl Blue dye removal efficiency was investigated. In the 30-minute electrochemical treatment, the highest removal (78.31%) of the Methyl Blue dye was obtained at the natural pH (≈5). After determining NaCl as the best-supporting electrolyte with 78.31% removal efficiency as the supporting electrolyte type, the removal efficiency increased from 78.31% to 88.25% by increasing the concentration of NaCl from 1.0 mM to 2.5 mM. As the last parameter whose effect was examined, Methyl Blue dye removal efficiency increased from 78.31% to 88.98% by increasing from 1.0 mA cm-2 to 2.5 mA cm-2 the current density which is one of the operating parameters. Experimental results demonstrated the suitability of the electrooxidation process for the effective removal of Methyl Blue dye using Ti/IrO2/RuO2 anode. Especially in indirect oxidation, it was determined that Methyl Blue dye electrolyzes only in the presence of chloride ions, which act as a redox mediator. Also, it was confirmed that the reaction was affected by pH, chloride concentration and applied current density.

Anahtar Kelimeler

• Methylene blue
• electrooxidation
• pH
• current density
• type of supporting electrolyte
• concentration of supporting electrolyte

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