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Fluoride uptake by zeolite NaA synthesized from rice husk: Isotherm, kinetics, thermodynamics and cost estimation

2018; Elsevier BV; Volume: 7; Linguagem: Inglês

10.1016/j.gsd.2018.03.003

2352-801X

Shraboni Mukherjee, Sanghamitra Barman, Gopinath Halder,

Phosphorus and nutrient management

The present study explores the feasibility of using crystalline zeolite NaA derived from rice husk ash as a potential adsorbent in removing fluoride from aqueous solution. BET surface area analyzer, SEM and FTIR were used to characterize the synthesized zeolite. The influence of five parameters viz. pH (2−8), initial concentration (1–20 mg/L), adsorbent dosage (15–150 mg), contact time (0–6 h) and temperature (30–65 °C) on fluoride uptake were investigated. Proximate analysis of rice husk was also carried out. Maximum adsorption capacity of the adsorbent was 22.83 mg/g and the Freundlich isotherm model fitted well to the experimental data. The adsorption process obeyed pseudo-second order kinetics. Thermodynamic parameters (ΔG°), (ΔH°) and (ΔS°) predicted the endothermic nature, randomness, spontaneity and feasibility of the adsorption process. Cost analysis also suggested the cost-effectiveness of the adsorbent used. Results reveal that zeolite NaA can be considered a promising and cost-effective adsorbent in treatment of fluorinated wastewater.