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Equilibrium and Kinetic Studies of Adsorption of Boron on Activated Alumina
Author(s) -
Bouguerra W.,
Marzouk I.,
Hamrouni B.
Publication year - 2009
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/j.1554-7531.2009.tb00254.x
Subject(s) - adsorption , boron , boric acid , freundlich equation , langmuir , monolayer , chemistry , kinetic energy , inorganic chemistry , nuclear chemistry , langmuir adsorption model , organic chemistry , biochemistry , physics , quantum mechanics
Boron is widely distributed in the environment, mainly in the form of boric acid or borate salts, and its contamination of waters is a concern around the world.
This study focuses on boron removal by means of adsorption onto activated alumina. Optimum adsorption was achieved in the pH range 8.0 to 8.5. Approximately 60% (by mass) boron removal was achieved using an adsorbent dose of 5 g at an initial boron concentration of 50 mg/L. Adsorption isotherms at 10, 20, and 30°C were investigated. The results fitted with the Langmuir and Freundlich equations showed a monolayer adsorption onto a surface, with a finite number of identical sites. To study the rate‐limiting step, the adsorption kinetic data of boron were analyzed using first‐order (Lagergren) and second‐order kinetic models. The experimental results obtained showed that the adsorption process followed a second‐order kinetic model.