Adsorption of Malachite Green and Methyl Violet 2B with Phthalate-Functionalized Sugarcane Bagasse

Dwi Ariani(1*), Nurul Hidayat Aprilita(2), Agus Kuncaka(3)

(1) Departement of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada
(2) Departement of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada
(3) Departement of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada
(*) Corresponding Author


In this study, the adsorption of malachite green and methyl violet 2B by phthalate-functionalized sugarcane bagasse (SPA) was investigated. The chemical modification of sugarcane bagasse (SB) with PA using pyridine as a solvent and the SPA was optimized through the evaluation of the effects of mass ratio of SB-PA and reaction time of reflux on the value of carboxylic acid groups amount on SPA surface. The amount of carboxylic acid groups amount on SPA surface was determined by back titration. SPA was characterized by Fourier transform infrared (FTIR), and scanning electron microscope (SEM) was used to adsorption of malachite green (MG) and methyl violet (MV) 2B. The back titration result showed that mass ratio of SB-PA 0.5:5 and reaction time 6 hours as the optimum conditions with the number of carboxylic groups of 359.36 x 10-2 mmol g-1. The FTIR result showed that SPA has a characteristic peak of carboxylic groups and SPA has the bigger pore size than SB showed by SEM. The optimum adsorption condition of MG with the value 121.94 mg g-1 was achieved at 20 mg SPA, pH 4 for 11 hours. The optimum adsorption condition of MV 2B with the value 71.17 mg g-1 was achieved at 30 mg SPA, pH 5 for 7 hours. The adsorption kinetics followed a pseudo-second-order with the rate constants for MG and MV 2B 1.21 x 10-2 and 0.68 x 10-2 hour-1, respectively. The adsorption behavior fit quite well with Freundlich model with adsorptions energy for MG and MV 2B 32.18 and 32.39 kJ mol-1, respectively.

Keywords:   sugarcane bagasse, phthalate anhydride, adsorption, malachite green, methyl violet 2B 

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