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DESIGN AND CONSTRUCTION OF A TUBULAR CONTINUOUS-FLOW PHOTOREACTOR WITH IMMOBILIZED TIO2 NANOPARTICLES ON GLASS SUPPORT AND KINETIC ANALYSIS OF THE REMOVAL OF 4-NITROPHENOL IN THIS PHOTOREACTOR
Abstract
Advanced oxidation processes (AOPs) with UV irradiation and titanium dioxide (TiO2) as a photocatalyst is a ’green’ process for the treatment and purification of water and wastewater. In this work, for further investigation of applicable AOPs for wastewater treatment, a novel tubular continuous-flow photoreactor was designed and constructed and then all experiments were carried out in this photoreactor. The photoreactor comprises six quartz tubes and a UV lamp, which was placed in the center of the quartz tubes. Glass plates loaded with TiO2-P25 with heat attachment method were inserted in the each quartz tubes. The photocatalytic degradation of 4-Nitrophenol (4-NP) as a model contaminant in aqueous solutions was investigated in the tubular continuous-flow photoreactor. Results of experiments indicate removal percent is a function of photoreactor length and volumetric flow rate. Kinetic analysis shows degradation of 4-NP in continuous-mode can be modeled with Langmuir-Hinshelwood (L-H) model. The values of kL-H (the reaction rate constant) and Kads (the adsorption coefficient of 4-NP on the TiO2) were obtained from L-H model. The design equation proposed for photoreactor and also experimental data show a linear relation exists between pseudo-first-order reaction rate constant and reciprocal of liquid volumetric flow rate.
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