Citric Acid Removal from Aqueous Solution with Layered Aluminum Hydroxide Crystals

Document Type: Research Article


1 Facultad de Ciencias Aplicadas a la Industria. Universidad de Camagüey “Ignacio Agramonte Loynaz”. Circunvalación Norte, km 5.5. C.P. 74650. Camagüey, CUBA

2 Departamento de Química, Universidad de Guadalajara, Marcelino García Barragán 1421. C.P. 44430, Guadalajara, Jalisco, MÉXICO

3 Departamento de Ingeniería Química. Universidad Central “Martha Abreu de Las Villas”, Carretera Camajuaní km 7.5, Santa Clara, CUBA

4 Departamento de Química, Facultad de Ciencias. Universidad de las Islas Baleares. Carretera Valldemossa km 7.5 Palma de Mallorca. ESPAÑA


Aluminum hydroxide is a compound with diverse crystalline structures, some of which demonstrate the ability to remove chemicals from aqueous solutions. In this research, aluminum hydroxide with the Bayerite structure was synthesized and used to remove Citric Acid (CA). This structure was not modified under the reaction conditions where CA ranged from 2 to 6 mg of CA in 20 mL of water, the temperature ranged from 30 to 90 °C, and time ranged from 8 to 24 h. The constants in the Freundlich model indicated that adsorption is the phenomenon governing the CA capture by aluminum hydroxide. According to infrared spectroscopy data, adsorption of CA was produced by the hydrogen bond of hydroxyl groups in aluminum hydroxide with either carboxylate or carboxylic groups in CA. The highest removal of CA was 92.12% and the temperature was the only factor with an effect on the percentage of CA removal.


Main Subjects

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