Pb(II), Cu(II) and Cd(II) Removal through Untreated Rice Husk; Thermodynamics and Kinetics

被引：5
|
作者：
Guiso, Maria Giovanna [1 ]
Alberti, Giancarla [1 ]
Emma, Giovanni [1 ]
Pesavento, Maria [1 ]
Biesuz, Raffaela [1 ]
机构：
[1] Univ Pavia, Dipartimento Chim, I-27100 Pavia, Italy
来源：
ANALYTICAL SCIENCES | 2012年 / 28卷 / 10期
关键词：
AQUEOUS-SOLUTION; HEAVY-METALS; ADSORPTION; BIOSORPTION; EXCHANGE; EQUILIBRIUM; COPPER(II); ISOTHERM; LEAD(II); SORPTION;
D O I：
10.2116/analsci.28.993
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The sorption properties of rice husk towards Cu(II), Cd(II) and Pb(II) were studied. The sorption isotherms are described by the Langmuir equation, and Pb(II) shows a higher affinity for rice husk compared to Cu(II) and Cd(II) under the same conditions. The kinetics of sorption obeys to a pseudo second-order equation for all metals. The sorption profiles as a function of the pH were used to characterize the stoichiometry of the sorption reaction. The competition for metal complexation by any ligand in solution is also accounted for. Upon increasing the ionic strength, the sorption curves of Pb(II) move to basic pH; this shift can be explained by considering the effect of nitrate complexes on the free metal ion concentration, since KNO3 is used as the ionic medium. An attempt to employ rice husk in a dynamic system is presented.
引用
收藏
页码：993 / 999
页数：7
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