Preparation of Cationic Starch-Montmorillonite Nanocomposites for Methylene Blue Adsorption
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Abstract
This research aims to study the preparation of nanocomposites from montmorillonite (MMT) and cationic starch (CST) for dyes adsorption applications. CSTs were synthesized by the reaction of low molecular weight starch (LMW-ST) with 3-chloro-2-hydroxypropyl-N-N-N-trimethyl ammonium chloride (CHPTAC) as cationizing agent. The synthesized CSTs were used to determine the nitrogen content by CHN analysis. CST (molar ratio of anhydroglucose unit (AGU):CHPTAC is 1:3) was applied to prepare the CST-MMT nanocomposites, at difference mass ratio, and characterized by XRD. The dye adsorption ability of nanocomposites (methylene blue) was investigated by using UV-VIS spectrophotometry. From XRD result, it could be said that the CST-MMT composites had the intercalated nanostructure. The dye adsorption of MMT and CST-MMT nanocomposites was measured at initial concentration of 500 mg/L adsorbent for 24 hrs. The CST-MMT nanocomposites showed better adsorption efficiency than the neat MMT. The percentage of dye removal of methylene blue (CST:MMT 0.5:1 was representative for the CST-MMT nanocomposites) was 99.99 %. The maximum value for adsorption capacity of methylene blue on the CST-MMT nanocomposite was 93.61 mg.g-1 adsorbent. The adsorption ability of CST-MMT nanocomposites at the different times and concentrations was also studied. The result of the adsorption behavior of methylene blue on CST-MMT nanocomposite indicated that the adsorption capacity process followed the Langmuir isotherm model with the maximum adsorption capacity of 93.45 mg.g-1. The adsorption kinetics behavior was fit to the pseudo-second-order model.
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References
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