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Title

THE EFFECT OF CU/TIO2 MOLAR RATIO ON THE PHOTO CATALYTIC ACTIVITY UNDER VISIBLE-LIGHT IRRADIATION

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Abstract

 DYE SOLUTIONS DUMP LARGE AMOUNT OF POLLUTED WATER IN THE ENVIRONMENT. TIO2 WITH AN ENERGY BAND GAP OF ABOUT 3.2 EV, WHICH ABSORBS MOSTLY THE ULTRAVIOLET PORTION OF THE SOLAR SPECTRUM AND ONLY A SMALL AMOUNT OF VISIBLE LIGHT, STILL IS THE MOST EXTENSIVELY STUDIED SEMICONDUCTOR FOR THE PHOTO CATALYTIC APPLICATIONS [1]. IN THIS WORK CU DOPED TIO2 PHOTO CATALYSTS WITH DIFFERENT MOLAR RATIOS OF CU/TIO2 (0.25, 0.5, 0.75 AND 1.0%) WERE SYNTHESIZED USING HYDROTHERMAL AND SOL-GEL METHODS. THE DOPED TIO2 PHOTO CATALYSTS DISPLAYED NARROWER BAND GAP COMPARED TO THE PURE TIO2 CATALYST. THE MOLAR RATIO OF CU/TIO2 WAS VARIED AND OPTIMIZED TO ENHANCE PHOTO-CATALYTIC ACTIVITY. THE PHOTO CATALYTIC ACTIVITY OF THE PREPARED PHOTO CATALYSTS WAS EVALUATED BY DECOLORIZATION OF METHYLENE BLUE (MB) AS A COMMON TEXTILE DYE EXISTING IN WASTEWATERS [2]. THE EFFECT OF THE MOLAR RATIO OF CU/TIO2 ON THE EFFICIENCY OF THE PHOTO CATALYTIC DEGRADATION OF MB UNDER VISIBLE-LIGHT IRRADIATION WAS INVESTIGATED (FIG. 1). THE RESULTS SHOW AN ENHANCED IN THE PHOTO CATALYTIC PERFORMANCE AT THE LOWER MOLAR RATIOS BECAUSE OF THE INCREASED LIFETIME OF PHOTO GENERATED CHARGES AND THE EXTENSION OF THE ABSORPTION RANGE.

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