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Abbad B.,Solar Equipment Development Unit | Abbad B.,University of Science and Technology Houari Boumediene | Lounis A.,University of Science and Technology Houari Boumediene
Desalination and Water Treatment | Year: 2014

Abstract: The effects of equilibrium time, solution pH, and sorption temperature of cationic methylene blue (MB) adsorption on nanoporous metallosilicoaluminophosphate ZnAPSO-34 were studied using a batch equilibration method. UV–Vis spectroscopy was used to obtain the adsorption isotherms at 20°C. The optimum period for adsorption was 300 min. In fact, MB removal increased from 82 to 95% when we double the amount of adsorbent from 0.05 to 0.1 g l−1. The equilibrium adsorption data were analyzed using Langmuir, Freundlich, and Temkin isotherm models. Langmuir isotherm was found to be the best-fitting model and the process followed pseudo-second-order kinetics. The results showed that ZnAPSO-34 could be employed as an alternative for the removal of dyes and colorants from aqueous solutions. © 2013, Balaban Desalination Publications. All rights reserved. Source


Tassalit D.,Sudan University of Science and Technology | Tassalit D.,Solar Equipment Development Unit | Laoufi A.N.,Sudan University of Science and Technology | Bentahar F.,Sudan University of Science and Technology
Science of Advanced Materials | Year: 2011

This study was conducted to investigate the efficiency of a photocatalysis oxidation system for pharmaceutical pollutants treatment. Oxidative degradation of tylosin by hydroxyl radicals (OH) was studied in aqueous medium using suspended forms of TiO 2 (Degussa P-25) under UVA (365 nm) irradiation light. The results showed that the degradation of tylosin was affected by many factors. The optimum rate of photodegradation was obtained with a flow rate and a catalyst coating equal to 3.78 mL/s and 0.05 g/L respectively. And the rate of photodegradation was found to increase when the tylosin concentration decreases from 30 to 5 mg/L. In addition, it was shown that the tylosin degradation followed the first-order kinetics and the reaction rate was well fitted with Langmuir-Hinshelwood model. The removal ratio of tylosin was 97% in less than 60 minutes. Thus, the UV/TiO 2 photocatalysis process is very efficient and can be suggested for the degradation of tylosin in aqueous solution. © 2011 American Scientific Publishers. Source


Chekir N.,Solar Equipment Development Unit | Chekir N.,Sudan University of Science and Technology | Benhabiles O.,Solar Equipment Development Unit | Laoufi N.,Sudan University of Science and Technology | Bentahar F.,Sudan University of Science and Technology
6th International Conference on Thermal Engineering Theory and Applications | Year: 2012

The degradation of linuron (LN) was investigated in an aqueous suspension of TiO 2 using solar energy in tubular reactor. This study was conducted to evaluate the performance of a low-cost tubular photoreactor prototype built along this work and explore the feasibility of this concept as the basis for the solar photocatalytic oxidation. The objective of the study was to assess the influence of various parameters such as initial pesticide concentration, catalyst concentration and pH on the photocatalytic degradation rate of linuron (LN) under UV sunlight. The optimum rate of photodegradation (82.7%) was obtained with a flow rate and a catalyst coating equal to 17 L/mn and 0.5 g/L respectively. And the rate of photodegradation was found to increase when the linuron concentration decreases from 15 to 3mg/L. Adjusting the pH favors the photocatalytic reaction and the best performance (92%) was obtained for pH 5 adjusted. Thus, the UV (sun)/TiO2 photocatalysis process is very efficient and can be suggested for the degradation of linuron in aqueous solution. Source


Abderrezek M.,Solar Equipment Development Unit | Abderrezek M.,Ferhat Abbas University Setif | Fathi M.,Solar Equipment Development Unit | Djahli F.,Ferhat Abbas University Setif | Ayad M.,Solar Equipment Development Unit
International Journal of Photoenergy | Year: 2013

The increase in the conversion efficiency of monolithic tandem solar cells is limited by the short-circuit current density matching between the top and the bottom cells. Generally, the top cell presents the lowest current in the two subcells. In this paper, in order to increase the short-circuit current density in the top cell, we present a theoretical survey of the luminescence downshifting (LDS) approach for the design of monolithic tandem solar cells. The photovoltaic (PV) glass encapsulation material is replaced with a polymer material of polymethyl methacrylate (PMMA) type which is doped with diverse kinds of organic dyes. The performance of the n-p-p+ GaInP structure has been simulated as a function of the organic dyes. Gains achieved for the short-circuit current density and conversion efficiency are, respectively, 13.13% and 13.38%, under AM1.5G illumination spectra. © 2013 Mahfoud Abderrezek et al. Source


Benhabiles O.,Solar Equipment Development Unit | Chekir N.,Solar Equipment Development Unit | Taane W.,Solar Equipment Development Unit
Energy Procedia | Year: 2012

The objective of this study is to characterize a tubular reactor. The experimental set-up consists of a collector with a capacity of 20L consisting 05 glass tubes connected in series. The characterization of the reactor is made using determination of residence time distribution RTD, knowledge of the various parameters of the RTD is an invaluable diagnostic tool that allows realizing the overall operation of the reactor hydrodynamic and detecting anomalies flow. The experimental results show the photéréacteur dysfunctions. From the results of the RTD we can determine the Peclet number Pe and dispersion coefficient Da.Peclet number values are measuring range from 20 to 60, and those of the dispersion coefficient Da are very low between 2 and 8.10-3 m2/s. Knowledge of these values directs us to given an appropriate flow model. © 2012 Published by Elsevier Ltd. Source

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