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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Volume 26, No. 03, Month DECEMBER, Year 2019, Pages 236 - 255


Adsorption and photocatalysis process of titanium dioxide immobilized montmorillonite for malachite green decolorization

Jureeporn Wongjunda and Chakkrit Umpuch


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Titanium dioxide immobilized on montmorillonite (TiO2-MMt) was prepared and used for removal of malachite green dye (MG) from aqueous solution. The TiO2-MMt was characterized by various techniques such as specific surface area and average pore size by BET method and BJH method, respectively, morphology by SEM images, active functional groups by FTIR, and crystalline structure by XRD. The experiment was divided into 2 parts. First, the adsorption of MG was studied. It was found that the highest MG removal of 97.0% was obtained under a certain condition, pH of 5.0, contact time of 240 min, initial dye concentration of 300 mg/L and temperature of 55°C. Adsorption isotherm was better fitted by Langmuir’s equation. Kinetic data followed the pseudo-second order equation. The thermodynamic study noticed that the adsorption is endothermic process. Second, the photocatalysis of MG was carried out. The saturated MG loaded TiO2-MMt was radiated by a UVC light with intensity of 2.752 mW/cm2 at 254 nm for 24 hours. It was found that the percent MG removal was 16 % higher than that of the adsorption only. From the above results, TiO2-MMt was used effectively as adsorbent and photo-catalyst for MG removal from wastewater.


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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Published by : Faculty of Engineering Chiang Mai University
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