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Esra Bilgin Simsek,Bayram Kilic,Mansur Asgin,Ayse Akan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Reduced graphene oxide based TiO2–ZnO nanostructures (RGO/TiO2/ZnO) are growth by hydrothermal method and characterized by SEM, XPS, XRD, and UV–vis analyses. XRD analysis confirmed the formation of wurtzite ZnO and anatase TiO2 over the tandem nanostructure. The UV–vis spectrum indicated that the hybrid catalyst has the lowest band gap energy (Eg = 2.5 eV). Photocatalytic degradation of the catalysts towards estrogen (bisphenol-A) and pharmaceuticals (ibuprofen, flurbiprofen) was investigated under UV and visible light irradiation. The heterojunction RGO/TiO2/ZnO catalyst exhibited greater photocatalytic activity than bifunctional RGO/TiO2 and TiO2/ZnO.
Esra Bilgin Simsek,Ulker Beker 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Arsenic adsorption properties of mono- (Fe or Al) and binary (Fe-Al) metal oxides supported on natural ze-olite were investigated at three levels of temperature (298, 318 and 338 K). All data obtained from equilibrium experimentswere analyzed by Freundlich, Langmuir, Dubinin-Radushkevich, Sips, Toth and Redlich-Peterson isotherms, and errorfunctions were used to predict the best fitting model. The error analysis demonstrated that the As(V) adsorption pro-cesses were best described by the Dubinin-Raduskevich model with the lowest sum of normalized error values. Ac-cording to results, the presence of iron and aluminum oxides in the zeolite network improved the As(V) adsorptioncapacity of the raw zeolite (ZNa). The X-ray photoelectron spectroscopy (XPS) analyses of ZNa-Fe and ZNa-AlFesamples suggested that the redox reactions are the postulated mechanisms for the adsorption onto them while the ad-sorption process is followed by surface complexation reactions for ZNa-Al.