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Linda Hevira,Zilfac,Rahmayeni,Joshua O. Ighalo,Hermansyah Aziz,Rahmiana Zein 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Synthetic dyes from effluents and wastewaters can be harmful to the ecosystem even at lowconcentrations. This study evaluated the performance of biosorbent from Terminalia catappa (TC) shellsto remove methylene blue (MB) from aqueous solutions. The biosorbent was characterized using SEMEDX,FTIR, BET, XRF and TGA. The optimum condition for TC shell uptake of MB was at pH 5, 45 mincontact time, initial concentration of 800 mg L 1 and with a maximum biosorption capacity was88.62 mg g 1. The optimal conditions were achieved at the particle size ( 36 mm), 25 mL dye solutioncontaining 0.1 g biosorbent dosage and 100 rpm agitation speed. The adsorption isotherm and kineticsstudy revealed that MB uptake was best-fit to the Freundlich and pseudo-second-order modelsrespectively. The thermodynamic analysis determined over the temperature range of 298–318 K showedthat the process was endothermic and spontaneous. The mechanism of MB uptake onto TC shells was bypore diffusion, hydrogen bonds, cation exchange, electrostatic attraction and p-p stacking. MB waseffectively desorbed from TC shells using 30% acetic acid and usable for 3 cycles. The MB removal ofefficiency was 90.56% in real wastewater sample at pH 5.
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