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Template-free preparation of TiO2 microspheres for the photocatalytic degradation of organic dyes
Mouza Al Ruqaishy,Faisal Al Marzouqi,Kezhen Qi,Shu-yuan Liu,Sreejith Karthikeyan,김영훈,Salma Mohamed Zahran Al-Kindy,Alex Tawanda Kuvarega,Rengaraj Selvaraj 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.11
TiO2 microspheres were successfully synthesised by simple solution phase method by using various amount of titanium butoxide as precursor. The prepared TiO2 were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance absorption spectra (UV-DRS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XRD analysis revealed that the as-synthesized TiO2 microsphere poses an anatase phase. The photocatalytic degradation experiments were carried out with three different dyes, such as methylene blue, brilliant black, reactive red-120 for four hours under UV light irradiation. The results show that TiO2 morphology had great influence on photocatalytic degradation of organic dyes. The experimental results of dye mineralization indicated the concentration was reduced by a high portion of up to 99% within 4hours. On the basis of various characterization of the photocatalysts, the reactions involved to explain the photocatalytic activity enhancement due to the concentration of titanium butoxide and morphology include a better separation of photogenerated charge carriers and improved oxygen reduction inducing a higher extent of degradation of aromatics.
Fabrication of g-C3N4 nanosheets on stainless steel mesh for effective separation of oil from water
Al-Kindi Nada Saeed,Marzouqi Faisal Al,Khraisheh Majeda,Kim Younghun,Selvaraj Rengaraj 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
Most industries depend mainly on oil and oil-based processes, which resulted in producing large volumes of oily wastewater. One of the most common methods used for the treatment of oily contaminated water is filtration by modified surfaces. In this research g-C3N4 nanostructured material was prepared via thermal condensation method. The samples were characterized by advanced techniques such as XRD, XPS, FTIR scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrophotometry (EDX). The result showed that g-C3N4 were crystallized in tri-s-triazine phases and their mean crystalline sizes of these nanostructures were 12.17 nm. The high-magnification microscopy images show that the morphology of g-C3N4 was nanosheet. A stainless-steel mesh was modified and coated with the prepared g-C3N4 nanostructured materials to be used for the separation of oil and water mixture. Due to the hydro-phobic nature of the modified meshes, oil drops spread over the mesh surface and the water drops form spherical shapes. The most efficient coating among all the modified meshes was g-C3N4, which was functionalized using silane moiety. The separation efficiency of this coated mesh reached 74.87% and it resulted in fast separation. This mesh can separate different types of oil from the oil/water mixture, such as toluene, mineral oil, 2-ethyl-1-hexanol, and n-pentane with good efficiency. Separation was repeated up to 40 times using the same mesh, and the separation efficiency was measured each time.