Characterization of Pequi (Caryocar brasiliense) Shells and Evaluation of Their Potential for the Adsorption of PbII Ions in Aqueous Systems

被引：21
作者：
Amorim, Dayane J. [1 ]
Rezende, Helen C. [2 ]
Oliveira, Erica L. [1 ]
Almeida, Ione L. S. [3 ]
Coelho, Nviam. M. [3 ]
Matos, Tulio N. [1 ]
Araujo, Cleide S. T. [1 ]
机构：
[1] Univ Estadual Goias, Campus Anapolis Ciencias Exatas & Tecnol, BR-75133900 Anapolis, Go, Brazil
[2] Univ Fed Goias, Unidade Acad Ciencias Exatas, BR-75805190 Jatai, Go, Brazil
[3] Univ Fed Uberlandia, Inst Quim, BR-38400902 Uberlandia, MG, Brazil
来源：
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2016年 / 27卷 / 03期
关键词：
Pb-II adsorption; isotherm; kinetic of biosorption; pequi shell; LEAD(II) IONS; BY-PRODUCT; REMOVAL; EQUILIBRIUM; CADMIUM; KINETICS; CU(II); BIOSORPTION; SORPTION; WASTE;
D O I：
10.5935/0103-5053.20150304
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this study pequi (Caryocar brasiliense) shells were evaluated in relation to their potential for the adsorption of Pb-II ions in aqueous systems. The adsorbent was characterized by point of zero charge (PZC), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and PbII ions were detected by flame atomic absorption spectrometry (FAAS). The adsorption parameters studied were solution pH, adsorbent mass, contact time and the optimum adsorption conditions were found to be 7.0, 50 mg and 30 min, respectively, using 15 mL of the metal solution. A study on the adsorption kinetics and isotherms was performed applying the optimized conditions. The adsorption process followed a pseudo-second-order model. The experimental adsorption data were fitted to the Langmuir and Freundlich isotherm adsorptions and a very good fit to the Langmuir linear model was observed. The maximum adsorption capacity was found to be 35.52 mg g(-1).
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页码：616 / 623
页数：8
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