Kinetic, equilibrium and thermodynamic studies for the removal of lead (II) and copper (II) ions from aqueous solutions by nanocrystalline TiO2

被引：59
作者：
Rashidi, Fatemeh [2 ]
Sarabi, Reza Sadeghi [2 ]
Ghasemi, Zinab [3 ]
Seif, Ahmad [1 ]
机构：
[1] Islamic Azad Univ, Dept Chem, Boroujerd Branch, Boroujerd, Iran
[2] Lorestan Univ, Dept Chem, Lorestan, Iran
[3] Ahvaz Branch, Dept Chem, Ahvaz, Iran
来源：
SUPERLATTICES AND MICROSTRUCTURES | 2010年 / 48卷 / 06期
关键词：
Adsorption; Heavy metal ions; Nanocrystaline TiO2; Kinetics; Thermodynamics; Lead; Copper; SINGLE METAL SOLUTIONS; ACTIVATED CARBON; ADSORPTION; CU(II); CD(II); PB(II);
D O I：
10.1016/j.spmi.2010.09.011
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Titanium dioxide nanocrystallites were synthesized as adsorbents through the hydrolysis of titanium tetrachloride as the precursor in hydrochloric acid The product was analyzed by XRD BET and SEM-EDX analysis indicated that the particles were a mixture of 86 8% rutile and 13 2% anatase TiO2 with spherical shapes The adsorption of Pb (II) and Cu (II) metal ions from aqueous solution onto nano-TiO2 were investigated with variations in pH contact time initial metal ion concentration and temperature The kinetics adsorption isotherm and adsorption thermodynamics of the heavy metals were studied The kinetics data were analyzed by the pseudo-first order pseudo-second order and intraparticle diffusion kinetic models the best correlation coefficients were obtained for the pseudo-second order kinetic model The adsorption results obtained from equilibrium experiments were analyzed by Freundlich Langmuir Temkin and Dubinin-Radushkevich isotherms with the Freundlich Isotherm giving the best fitting isotherm to the equilibrium data The thermodynamic parameters (Delta G degrees Delta H degrees and Delta S degrees) were calculated and it was found that the adsorption process is spontaneous and endothermic and is favored at higher temperature (C) 2010 Elsevier Ltd All rights reserved
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页码：577 / 591
页数：15
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