Preparation of colloidal hydrated alumina modified NaA zeolite derived from rice husk ash for effective removal of fluoride ions from water medium
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Preparation of colloidal hydrated alumina modified NaA zeolite derived from rice husk ash for effective removal of fluoride ions from water medium
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| Creator |
Naskar, Milan Kanti
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| Subject |
Engineering Materials
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| Description |
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.
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| Publisher |
Taylor & Francis
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| Date |
2020-04
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/4950/1/milan.pdf
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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| Relation |
http://cgcri.csircentral.net/4950/
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