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Analysis of equilibrium, kinetic, and thermodynamic parameters for biosorption of fluoride from water onto coconut(Cocos nucifera Linn.)root developed adsorbent

引用

Chinese Journal of Chemical Engineering 2019年第1期27卷 92-99页

作者： aju mathew george Ajay R.Tembhurkar Civil Engineering Department Visvesvaraya National Institute of Technology

Drinking water with higher fluoride levels results in serious irremediable health problems that have attained a startle all over the *** focused towards deflouridation through the application of biosorbents prepared from various plants are finding greater scope and *** research is done on Cocos nucifera Linn.(coconut tree) one of the very commonly available plants throughout Kerala and around the *** adsorbent developed from the root portion of *** *** used in the present *** study revealed that the fluoride uptake capacity is quite significant and linearly increases with initial adsorbate *** adsorption data is analyzed for Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models at varying initial adsorbate concentrations(2–25 mg·L^(-1)).It is found that the adsorption of fluoride onto *** *** adsorbent follows Langmuir *** isotherm constants "a" and "b" obtained are 2.037 mg·g^(-1) and 0.823 L·mg^(-1) at an adsorbent dose of 8 g·L^(-1) and temperature(26 ± 1) ℃.The mean free sorption energy, E obtained, is 9.13 kJ ·mol^(-1) which points out that the adsorption of fluoride onto *** *** adsorbent is by chemisorption *** kinetic study also supports chemisorption with adsorption data fitting well with a pseudo-second-order kinetic model with an estimated rate constant K_2 of 0.2935 g·mg^(-1) min at an equilibrium contact time of 90 *** thermodynamic study indicated the spontaneous and endothermic nature(ΔH =12.728 kJ·mol^(-1)) of fluoride adsorption onto the *** *** *** Electron Microscopy(SEM), BET, FTIR, and EDX methods were used to analyze the surface morphology of adsorbent before and after fluoride adsorption *** on deflouridation using *** *** adsorbent application on fluoride contaminated ground water samples from fields showed encouraging results.

关键词： Fluoride Biosorption Equilibrium Kinetics Thermodynamics Application

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