Water defluoridation using Al2O3 nanoparticles synthesized by flame spray pyrolysis (FSP) method
| Autor: | Abd Ali Naseri, Laleh Divband Hafshejani, Marja Maljanen, Jorma Jokiniemi, Hadi Moazed, Amit Bhatnagar, Abdolrahim Hooshmand, Sareh Tangsir, Anna Lähde |
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| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Chemistry General Chemical Engineering Inorganic chemistry Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Chloride Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Adsorption medicine Environmental Chemistry Point of zero charge Fourier transform infrared spectroscopy 0210 nano-technology Pyrolysis Fluoride medicine.drug |
| Zdroj: | Chemical Engineering Journal. 288:198-206 |
| ISSN: | 1385-8947 |
| Popis: | In the present study, Al 2 O 3 nanoparticles (synthesized by flame spray pyrolysis (FSP)) method were used for the defluoridation of aqueous solutions in batch tests under different experimental conditions. The point of zero charge (pH pzc ) of Al 2 O 3 nanoparticles was found to be 5.64. The role of functional groups in fluoride adsorption was discussed based on the data obtained from Fourier transform infrared (FTIR) analysis. The effects of different parameters such as solution pH, contact time, adsorbent dosage, temperature, initial fluoride concentration and presence of common competing anions were investigated on the defluoridation by Al 2 O 3 nanoparticles. Results of this study show that the optimum pH for fluoride removal was 5.56. Kinetic data revealed that the uptake rate of fluoride was rapid in the beginning and equilibrium was achieved in 120 min. The adsorption data fitted reasonable well with pseudo-second-order kinetic model. Also, the Sips isotherm model was found to fit well with experimental data of defluoridation by Al 2 O 3 nanoparticles. The maximum adsorption capacity for fluoride was 9.73 mg g −1 by Al 2 O 3 nanoparticles. The fluoride adsorption was decreased in the presence of phosphate followed by carbonate and sulfate ions, while chloride and nitrate ions did not show significant effect on fluoride adsorption by Al 2 O 3 nanoparticles. |
| Databáze: | OpenAIRE |
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