Naskar, Milan Kanti (2020) Preparation of colloidal hydrated alumina modified NaA zeolite derived from rice husk ash for effective removal of fluoride ions from water medium. Journal of Asian Ceramic Societies, 8 (2). pp. 437-447. ISSN 2187-0764

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Alumina is found to be a good adsorbent for the removal of fluoride. In the present study, rice husk ash-derived NaA zeolite has been modified with colloidal hydrated alumina in a cost-effective process for efficient removal of fluoride ions. The prepared NaA zeolite powder was added into colloidal hydrated alumina under stirring at 70 degrees C/2 h followed by drying at 100 degrees C/6 h to obtain modified zeolite. The product reveals enhanced adsorption efficiency (95-99%) for the removal of fluoride ions at wide ranges of adsorbate concentration (similar to 5-200 mg/L), adsorbent concentration (0.5-10 g/L), pH (3-10), and temperature (30-70 degrees C). Regeneration study shows that adsorption remained >90% up to third cycle followed by gradual decrease of adsorption for consecutive cycles. Kinetics study of fluoride adsorptions shows best fit for pseudo-second-order model demonstrating chemisorption process through a monolayer formation. The adsorption isotherm reveals that Langmuir isotherm is the best fit model indicating maximum adsorption capacities of 104.16, 68.12 and 36.13 mg/g for the adsorbent doses of 0.5, 1 and 2 g/L, respectively. Colloidal hydrated alumina modified NaA zeolite derived from rice husk ash could be utilized as low cost adsorbent for effective removal of fluoride ions from water.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 05 Feb 2021 11:19
Last Modified: 05 Feb 2021 11:19

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