Akademik Veri Yönetim Sistemi
8th International Eurasian Conference on Biological and Chemical Sciences , Ankara, Türkiye, 17 - 19 Aralık 2025, ss.910-917, (Tam Metin Bildiri)
Dyes discharged from industrial activities pose a major threat to the environment due to their high solubility, chemical stability, and resistance to biodegradation. Commonly used in textile, paper, leather, food, and cosmetic industries, these pollutants accumulate in aquatic ecosystems, causing toxicity, bioaccumulation, and risks to human health. Conventional treatment methods such as filtration, sedimentation, and biological processes are often ineffective for dye removal because they cannot break down recalcitrant dye structures. Advanced oxidation processes (AOPs) have therefore emerged as effective technologies capable of degrading and mineralizing persistent organic contaminants. These processes rely on the in-situ generation of highly reactive hydroxyl radicals (•OH), typically produced through iron-catalyzed decomposition of hydrogen peroxide (H₂O₂). In the electroFenton (EF) process, hydrogen peroxide (H₂O₂) is electrogenerated at the cathode while Fe²⁺ is continuously regenerated, sustaining radical formation. Photoelectro-Fenton (PEF) further improves EF performance by applying UV irradiation, which accelerates Fe³⁺→Fe²⁺ cycling and enhances •OH production. The heterogeneous electro-Fenton (HEF) approach uses solid iron-based catalysts instead of soluble iron, enabling operation over a wider pH range and facilitating catalyst recovery. The heterogeneous photoelectro-Fenton (HPEF) process combines solid catalysts with electrochemical and photonic activation, providing higher stability and increased degradation efficiency. In this study, the effects of current intensity on the degradation and mineralization of Acid Fuchsin dye in aqueous media were examined using EF, PEF, HEF, and HPEF processes with a boron-doped diamond (BDD) anode and carbon felt (CF) cathode at pH 3. Under 100 mA and 0.1 mM Fe²⁺, EF achieved complete color removal in 18 min and full COD removal in 36 min. PEF achieved complete color removal in 18 min and full COD removal in 60 min under 100 mA and 0.1 mM Fe²⁺. HEF, using 0.1 g·L⁻¹ Fe₃O₄, provided complete color removal in 24 min and total COD removal in 90 min. The HPEF process, performed with 0.1 g·L⁻¹ Fe₃O₄ and 100 mA, achieved identical color removal (18 min) and COD removal (60 min). These findings demonstrate the high efficiency of electrochemical and photoelectrochemical AOPs for rapid and complete dye degradation.