Surface Coating TiO 2 on Sepiolite Fibers and Application in Paper-making Waste Water Treatment
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Surface Coating TiO2 on Sepiolite Fibers and Application in Paper-making Waste Water Treatment Yajie Guo1, Yuran Wang2, Guangjian Wang1,*, Zhengwang Liu1, Zhengxing Yang1 and Fei Wang2 1 School of Chemistry and Materials Science, Huaibei Normal Univesity, Huaibei, Anhui, 235000, P.R. China; 2 School of Chemical Engineering, Shanghai Jiaotong University, Shanghai, 200030, P.R. China; *Corresponding author, Email: [email protected] ABSTRACT The purpose of this paper was to describe a method of preparing Fe-TiO2 supported on sepiolite fibers with sol-gel method and to discuss the feasibility of photocatalytic degradation of paper-making waste water with chemical oxygen depletion (CODcr) (Potassium dichromate method) as evaluation criterion of catalytic activity. As-fabricated catalysts consisted of TiO2 particles impregnated with iron and dispersed on the sepiolite fibers (S.F.s). The novel Fe-TiO2-sepiolite was characterized by specific surface area and pore size distribution measurements, scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD) and Fourier transform Infrared spectrometer (FT-IR) etc. The effects of parameters such as the amount of Ti/sepiolite fibers, initial pH, H2O2, Fe-doped, concentration of waste water, etc. were studied in detail. The results indicated that the presence of sepiolite in the support preparation and its role as a matrix over which TiO2 particles were dispersed seem to play an important effect in the migration process of oxygen species through the support vacancies. On the basis of these properties, the most promising carriers to be used in a waste water treatment process were selected. Keywords: sepiolite fibers, surface coating, photocatalyst, water treatment, CODcr 1. INTRODUCTION Photocatalysis with titanium dioxide has proved to be very promising ways for treatment of waste water containing organic contaminants due to a complete mineralization of the organic contaminants under the mild conditions such as ambient temperature and ambient pressure [1]. Among various photochemical reactors employed in the photocatalysis degradation studies, the titanium dioxide-suspended batch reactor has been widely utilized for laboratory experiments because of simplicity and no necessity of any special equipment. However, this reactor has a disadvantage for the industrial application; the separation of the titanium dioxide after the photocatalysis degradation is rather difficult because of fineness of the particles [2]. The reutilization of titanium dioxide has not been advanced for the treatment of waste water. The use of large-particle-size titanium dioxide has been recommended to attain its ready recovery, however, the photocatalysis degradation efficiency of water contaminants must be sacrificed. Various supports such as different classes of glass [3], quartz [4], silica [5], activated carbon [6], zeolites [7], commercial fiberglass [8], polymers [9], clays [10], surfactant vesicles [11], membranes [12], etc. were utilized as ca
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