Abstract
The layered double hydroxides (LDHs) calcined at a certain range of temperature have the “memory effect” which means to recover its original layered structure in the presence of appropriate anions. Kinetics of fluoride removal from aqueous solution by calcined MgAl−CO3 LDHs (denoted CLDH) was studied in batch mode. The influences of pH of solution, initial fluoride concentration, CLDH quantity, and temperature on the kinetic of fluoride removal have been tested in detail. The results of four kinetic models fitted to the experimental data show that the pseudo-second-order kinetic model gave a better description for the uptake process. The rate constants and activation energy of adsorption were also calculated. The calculated value of Ea was 39.73 kJ/mol, indicating a reaction-controlled process.
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