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SM ISO690:2012 HUMELNICU, Doina, ZINICOVSCAIA, Inga, HUMELNICU, Ionel, IGNAT, Maria I.. Removal of aluminium ions from residual waters by mesoporous materials. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 176. ISBN 978-9975-62-428-2. |
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Achievements and perspectives of modern chemistry 2019 | |||||
Conferința "International Conference "Achievements and perspectives of modern chemistry"" Chişinău, Moldova, 9-11 octombrie 2019 | |||||
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Pag. 176-176 | |||||
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Due to the fact that we assist to a continuously increasing of the concentration of heavy metals in waters on impose to take concrete and efficient measures at the level of the pollution from the different industry, laboratories. The synthesis and application of adsorptive materials with low cost and high efficiency recovery of heavy metals from residual waters is necessary for environmental protection. In this work, the capacity of hydroxyapatite with different treatment as inexpensive sorbent for aluminium removal from water solutions was investigated. Experiments were performed in batch technique at different pH values, temperatures, sorbent dosage, contact time and initial aluminium concentration.Thermodynamic studies gave negative ÂG values for all the sorbents suggesting that the aluminium ions adsorption process was spontaneous and thermodynamically favorable. The adsorption behavior of the sorbents was fitted to five isotherm models and the data fitted the Langmuir isotherm well. The kinetics of adsorption was evaluated using three kinetic models. The rate of aluminium adsorption was successfully described by a pseudo-second-order kinetic model.The obtained results indicated that hydroxyapatite treated with Pluronic P123 surfactant has a higher sorption capacity toward aluminium ions (117.65 mg·g–1) than hydroxyapatite untreated (104.17 mg·g–1) and hydroxyapatite treated with Pluronic F127 surfactant (109.89 mg·g–1). The uptake of Al(III) by these sorbents is a reversible process and the sorbents can be used in five desorption/sorption cycles without significant loss in their adsorption capacities. |
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