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  • Title: Alkali assisted hydrophobic reinforcement of coconut fiber for enhanced removal of cationic dyes: equilibrium, kinetics, and thermodynamic insight.
    Author: Mohanta J, Kumari R, Qaiyum MA, Dey B, Dey S.
    Journal: Int J Phytoremediation; 2021; 23(13):1423-1431. PubMed ID: 33813963.
    Abstract:
    The present study illustrates enhanced removal of methylene blue (MB) and malachite green (MG) from water using alkali-activated coconut fiber (ACF) as adsorbent. Alkali activation effectively reduces the lignocellulosic components present within coco-fiber which in turn reinforces the coco-fiber to become more water-stable. The material was characterized by FTIR, SEM-EDS, BET, XRD, and pHZPC. BET surface area was found to be 10.901 m2 g-1, whereas pHZPC of the material is 6.05. FESEM images reveal rod-like morphology. Batch experiments were optimized with respect to contact time (0-120 min), temperature (288-308 K), pH (3-10), dose (1-5 g) and input dye concentration (10-50 mg L-1). The maximum adsorption coefficient was found to be 133.11 and 110.74 mg g-1 for MB and MG respectively. Adsorptions are best described by pseudo-second-order kinetics (kMB = 1.712, R2 = 0.999; kMG = 1.399, R2 = 0.999) and Langmuir isotherm model (R2 = 0.999). Thermodynamic data suggests a spontaneous (ΔG, -14 kJ mol-1) and feasible process. Spent material could be regenerated by using 0.5 M HCl. Up to 50% retention of activities was seen after five cycles. It can be concluded that alkali-activated coconut fiber is an economic and sustainable choice for dye removal. Novelty statement: Spent coconut was converted into an effective biosorbent by simple alkali activation under ambient conditions to increase the hydrophobicity of the fibers by reducing the lignocellulosic components. Two cationic dyes; methylene blue and malachite green have been efficiently removed with adsorption capacities of 133.11 and 110.74 mg g-1. The operation is simple, economically viable, and partially fulfills the principles of green engineering. Comparing with contemporary adsorbents, this material offers higher adsorption capacities with multi-cycle reusability and enhanced water stability.
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