Leema Almakhadmeh - Academia.edu (original) (raw)
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Papers by Leema Almakhadmeh
Adsorption Science & Technology, 2003
Activated carbons derived from date pits obtained as a surplus agricultural solid waste and natur... more Activated carbons derived from date pits obtained as a surplus agricultural solid waste and natural date pits were used for the adsorption of cadmium ions from water. The effect of contact time, pH, temperature, cadmium ion concentration, sorbent dose, salinity, as well as the activation temperature on the removal of cadmium ions by date pits was studied. The maximum adsorption capacity of date pits for cadmium ions was obtained using the linear Langmuir isotherm model and used as a basis for comparative purposes. Three sorption kinetic models were used for explaining the probable mechanisms of cadmium ion uptake. The kinetic data for the adsorption process obeyed a second-order rate equation.
Process Biochemistry, 2003
... Date pits constitute roughly 10% of the date palm [8]. In Malaysia, which is the largest date... more ... Date pits constitute roughly 10% of the date palm [8]. In Malaysia, which is the largest date pits producer in the world, more than a million ton of date pits are estimated to be generated annually [9]. Date pits as a waste stream have been a problem to the date industry, therefore ...
Chemical Engineering & Technology, 2004
Activated carbons prepared from date pits, an agricultural waste byproduct, have been examined fo... more Activated carbons prepared from date pits, an agricultural waste byproduct, have been examined for the adsorption of phenol from aqueous solutions. The activated carbons were prepared using a fluidized bed reactor in two steps; carbonization at 700 C for 2 hours in N 2 atmosphere and activation at 900 C in CO 2 atmosphere. The kinetic data were fitted to the models of intraparticle diffusion, pseudo-second order, and Lagergren, and followed more closely the pseudo-second-order chemisorption model. The isotherm equilibrium data were well fitted by the Freundlich and Langmuir models. The maximum adsorption capacity of activated date pits per Langmuir model was 16 times higher than that of nonactivated date pits. The thermodynamic properties calculated revealed the endothermic nature of the adsorption process. The uptake of phenol increased with increasing initial phenol concentration from10 to 200 ppm and temperature from 25 to 55 C, and decreased with increasing the solution pH from 4 to 12. The uptake of phenol was not affected by the presence of NaCl salt.
Water, Air, & Soil Pollution, 2014
Adsorption Science & Technology, 2003
Activated carbons derived from date pits obtained as a surplus agricultural solid waste and natur... more Activated carbons derived from date pits obtained as a surplus agricultural solid waste and natural date pits were used for the adsorption of cadmium ions from water. The effect of contact time, pH, temperature, cadmium ion concentration, sorbent dose, salinity, as well as the activation temperature on the removal of cadmium ions by date pits was studied. The maximum adsorption capacity of date pits for cadmium ions was obtained using the linear Langmuir isotherm model and used as a basis for comparative purposes. Three sorption kinetic models were used for explaining the probable mechanisms of cadmium ion uptake. The kinetic data for the adsorption process obeyed a second-order rate equation.
Process Biochemistry, 2003
... Date pits constitute roughly 10% of the date palm [8]. In Malaysia, which is the largest date... more ... Date pits constitute roughly 10% of the date palm [8]. In Malaysia, which is the largest date pits producer in the world, more than a million ton of date pits are estimated to be generated annually [9]. Date pits as a waste stream have been a problem to the date industry, therefore ...
Chemical Engineering & Technology, 2004
Activated carbons prepared from date pits, an agricultural waste byproduct, have been examined fo... more Activated carbons prepared from date pits, an agricultural waste byproduct, have been examined for the adsorption of phenol from aqueous solutions. The activated carbons were prepared using a fluidized bed reactor in two steps; carbonization at 700 C for 2 hours in N 2 atmosphere and activation at 900 C in CO 2 atmosphere. The kinetic data were fitted to the models of intraparticle diffusion, pseudo-second order, and Lagergren, and followed more closely the pseudo-second-order chemisorption model. The isotherm equilibrium data were well fitted by the Freundlich and Langmuir models. The maximum adsorption capacity of activated date pits per Langmuir model was 16 times higher than that of nonactivated date pits. The thermodynamic properties calculated revealed the endothermic nature of the adsorption process. The uptake of phenol increased with increasing initial phenol concentration from10 to 200 ppm and temperature from 25 to 55 C, and decreased with increasing the solution pH from 4 to 12. The uptake of phenol was not affected by the presence of NaCl salt.
Water, Air, & Soil Pollution, 2014