Immobilized chitosan-montmorillonite composite adsorbent and its photocatalytic regeneration for the removal of methyl orange
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In this study, chitosan and clay-montmorillonite (CS-MT) composite was prepared and immobilized on glass plates for the removal of methyl orange (MO) dye from aqueous solution. The immobilized CS-MT was characterized using scanning electron microscopy-energy dispersive X-ray (SEM–EDX), Fourier transform infrared (FTIR), pore structural analysis and UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS). The addition of MT into the CS matrix produced a heterogeneous surface and slightly increased the surface area of the composite film. The adsorption study revealed that the pseudo-second-order kinetic and Langmuir isotherm models could well describe the adsorption of MO dye onto the immobilized CS-MT. After saturation, the spent CS-MT was regenerated via the TiO2 photocatalytic oxidation under UV–Vis irradiation. During the regeneration, the spent CS-MT underwent two concurrent processes: desorption of MO dye and photocatalytic oxidation of desorbed dye by the TiO2 photocatalyst. The photocatalytic regeneration of the spent immobilized CS-MT was highly effective in ultra-pure water at pH 11, as it mineralized up to 86% of the desorbed MO within 20 h of regeneration time.
KeywordsAdsorption Chitosan Immobilization Montmorillonite Photocatalytic regeneration Titanium dioxide
The authors would like to thank Universiti Sains Malaysia (USM) for the research facilities and financial support under the USM Short Term Grant (304/PJJAUH/6313104). We also would like to acknowledge the Ministry of Education (MOE) Malaysia for the financial assistance under the Fundamental Research Grant Scheme (FRGS, 203/PKIMIA/6711228) and scholarship under My Brain 15 to N.N. Bahrudin.
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