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In the present study, FeNPs were mycosynthesized by extract of fungus Aspergillus terreus GS28. The mycosynthesized FeNPs were characterized by transmission and scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction analysis, and particle size analyzer. The biofabricated FeNPs were positively charged and their size varied from 20 to 60 nm as found in different investigations. The biological originated materials (phenolic component, protein, and amino acids) are associated with FeNPs for capping the nanoparticles. The mycosynthesized FeNPs showed excellent adsorption capacity for CR (48.7 mg/g) and DB-1 (38.0 mg/g) with a removal efficiency of 97.5 and 77.1%, respectively, at 100 mg/L of CR/DB-1, pH 7.0, 30 °C, 2 g/L concentration of FeNPs, 240 min, and shaking condition of 120 rpm. FeNPs also exhibited high dye removal performance under the presence of …