Synthesis, characterization of photocatalytic, magnetic poly (EGDMA-VPA)-TİO2 polymer microspheres for the investigation of adsorption-desorption and photocatalytic decolorization of reactive blue dye

Magnetic photocatalytic poly (ethyleneglycoldimethacrylate-vinyl phosphonic acid) [m-poly (EGDMA-VPA)]-TiO2 crosslinked microspheres were synthesized by suspension polymerization in the presence of Fe3O4 / TiO2 nanoparticles to remove reactive blue 221 dye from aqueous solution. [m-poly (EGDMA-VPA)] - Characterization of TiO2 the microspheres scanning electron microscopy (SEM), differential thermal analysis (TG-DTA), Fourier Transform Infrared spectroscopy (FT-IR), surface area and porosity measurement Brunauer, Emmet and Teller (BET), phase information X-Ray Diffraction (XRD), elemental analysis X-ray photoelectron spectroscopy (XPS), magnetic property Electron Spin Resonance (ESR) and surface charge determination were characterized by Zeta potential measurement methods. [m-poly (EGDMA-VPA)] - Specific surface area of TiO2 microspheres 195.0 m2/g, swelling rate, 40.19%. m-poly (EGDMA-VPA)] - For TiO2 microspheres, the g factor is 1.94, indicating that the synthesized polymer composite gains magnetic property. The usability of synthesized microspheres for the removal of Reactive blue 221 (RB 221) from aqueous medium was examined. PH, initial dye concentration, temperature, adsorbent amount, time, daylight, UV light parameters on adsorption, desorption and photocatalytic effect of polymer microspheres were examined. Maximum adsorption at pH 3.0; maximum desorption was observed in 0.01M NaOH solution. The maximum removal for photocatalytic decolorization was determined at pH 3. It was determined that 96% removal was achieved at 298 K for photocatalytic decolorization. The applicability of adsorption process to Langmuir and Freundlich models was investigated and determined to be suitable for Langmuir isotherm. Adsorption and photocatalytic decolorization kinetics of the system were investigated. For this purpose, Pseudo first degree, false second degree and intraparticle diffusion models were used. Reaction rate constant was calculated for adsorption and photocatalytic decolorization.