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    COMPARATIVE INVESTIGATION OF Fe3O4, Fe3O4@HA AND Fe3O4@AC NANOPARTICLES ON DYES ADSORPTION
    (Gh Asachi Technical Univ Iasi, 2022) Kaykioglu, Gul; Yildiz, Aylin; Bayramol, Derman Vatansever; Dalmis, Ibrahim Savas; Miral, Iskender Tamer
    In this study, the removal of Methylene Blue (MB) and Methyl Orange (MO) dyestuffs from aqueous solutions via adsorption by using magnetic nanoparticles of Fe3O4, Fe3O4@HA and Fe3O4@AC synthesized under laboratory conditions was investigated. The synthesized magnetic nanoparticles were characterized by SEM, EDX, XRD, BET surface area, FTIR, average pore diameter and particle size distribution analysis. When Fe3O4, Fe3O4@HA and Fe3O4@AC were used as adsorbents, the optimum pH values for MB were determined as pH 11, pH 9 and pH 7, respectively, and pH 6, pH 4 and pH 4 for MO, respectively. At the determined optimum pH values, Fe3O4, Fe3O4@HA and Fe3O4@AC were determined to be 4.2 mg/g, 4.8 mg/g and 8 mg/g for MB at an initial dye concentration of 10 mg/L, while Fe3O4, Fe3O4@HA and Fe3O4@AC were determined to be 3 mg/g, 1.6 mg/g and 4.5 mg/g for MO, respectively. It was found to be compatible with the Freundlich isotherm and pseudo second-order model of all adsorption experiments. This study showed that Fe3O4@HA, synthesized by binding HA to Fe3O4, and Fe3O4@AC, synthesized, and carbonized by pyrolysis, magnetic nanoparticles can be used as a good alternative adsorbent for removing hazardous dyes from wastewater due to their good cleaning efficiency as well as easy synthesis and regeneration.
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    Öğe
    From industrial waste to carbon-containing nanocomposites to obtain multifunctional properties for industrial applications
    (Elsevier, 2022) Yildiz, Aylin; Acikbas, Burcu; Atav, Riza; Dalmis, Ibrahim Savas; Bayramol, Derman Vatansever; Bugdayci, Burhan
    Helianthus annuus (sunflower) and Brassica napus (canola) are two important crops for vegetable oil industry, but their residues after harvesting cause agricultural waste. In this study, agricultural wastes of sunflower and canola were utilized as activated carbon (AC) after pyrolysing the wastes at 450 degrees C and activating with HNO3 at 90 degrees C. Obtained AC was then used to produce Fe3O4@AC nanocomposites and beta-cyclodextrin(CD):Fe3O4@AC complex structures. Structural, morphological, spectroscopic, and thermal characteristic properties of the obtained nanocomposites and complex structures were examined by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared (FTIR) and Thermogravimetric Analysis (TGA), respectively. Produced nanocomposites and complex structures were coated onto cotton woven fabrics which were then tested for their UV protection, flame retardant and antibacterial activity. The test results of the coated fabrics and the control (uncoated cotton fabric) samples showed that Fe3O4@AC and CD:Fe3O4@AC coated fabrics showed significant UV protection, flame retardancy and antibacterial properties. Thus, the effects which would normally be obtained with 3 different finishing chemicals, each of which causes individual waste load, were achieved with a single chemical recycled from a waste. This work is critical in terms of waste management and providing a cleaner production alternative in the field of textile finishing.