Akademik Veri Yönetim Sistemi
International Journal of Environmental Analytical Chemistry, 2025 (SCI-Expanded)
This study explores the development and application of a novel magnetic anion exchange resin (DowFeO) for the effective removal of three textile anionic dyes: Remazol Turquoise Blue G-133 (RTB), Remazol Navy RGB 150% (RN), and Remazol Ultra Yellow RGBN (RUY). DowFeO was synthesised by modifying Dowex 1x16, a strong base anion exchange polymeric resin, with nano-Fe₃O₄ particles using the co-precipitation method, enhancing its magnetic properties for easy separation after dye adsorption. The characterisation of DowFeO was performed using FT-IR, SEM-EDX, XRD, and BET analyses, confirming successful Fe₃O₄ loading and the existence of functional groups contributing to dye adsorption. The specific surface area was found to be 25.05 m2 g−1, BJH adsorption average pore width was 8.46 nm, and the single point desorption total pore volume of pores was 0.0592 cm3 g−1. Batch adsorption experiments were conducted to optimise analytical parameters, including pH, temperature, adsorbent amount, extraction time, and ionic strength. The adsorption capacities (qm) were determined as 35.71 mg g−1 for RTB, 38.76 mg g−1 for RN, and 34.01 mg g−1 for RUY under optimal conditions. The limits of detection (LOD) and quantification (LOQ) were found to be 0.32 mg L−1 and 0.99 mg L−1 for RTB, 0.10 mg L−1 and 0.30 mg L−1 for RN, and 0.16 mg L−1 and 0.48 mg L−1 for RUY, respectively. DowFeO demonstrated high removal efficiencies (>99%) across various real water samples, including tap, urban, and geothermal wastewater. Adsorption isotherms and kinetic models were applied, with the Langmuir model best describing the adsorption behaviour, indicating monolayer adsorption. The correlation values in pseudo-second order (PSO) for the three different dyes are bigger than 0.99, which makes it the best kinetic model. The resin exhibited excellent reusability for multiple cycles, particularly for RTB and RN dyes. The results suggest that DowFeO is a promising adsorbent for anionic dye removal in wastewater treatment, offering efficient dye retention and reusability.