Efficient Separation of Heavy Metals by Magnetic Nanostructured Beads

被引：14

作者：

de Castro Alves, Lisandra ^{[1
]}

Yanez-Vilar, Susana ^{[1
]}

Pineiro-Redondo, Yolanda ^{[1
]}

Rivas, Jose ^{[1
]}

机构：

[1] Univ Santiago de Compostela Usc, Res Technol Inst, NANOMAG Lab, Appl Phys Dept, Santiago De Compostela 15782, Spain

来源：

INORGANICS | 2020年 / 8卷 / 06期

关键词：

heavy metals; magnetite nanoparticles; adsorption; nanocomposite; hybrid; multi-metal; water; ALGINATE BEADS; AQUEOUS-SOLUTION; REMOVAL; BIOSORPTION; LEAD; NANOPARTICLES; MERCURY(II); ADSORPTION; IONS; ACID;

D O I：

10.3390/inorganics8060040

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

This study reports the ability of magnetic alginate activated carbon (MAAC) beads to remove Cd(II), Hg(II), and Ni(II) from water in a mono-metal and ternary system. The adsorption capacity of the MAAC beads was highest in the mono-metal system. The removal efficiency of such metal ions falls in the range of 20-80% and it followed the order Cd(II) > Ni(II) > Hg(II). The model that best fitted in the ternary system was the Freundlich isotherm, while in the mono-system it was the Langmuir isotherm. The maximum Cd(II), Hg(II), and Ni(II) adsorption capacities calculated from the Freundlich isotherm in the mono-metal system were 7.09, 5.08, and 4.82 (mg/g) (mg/L)(1/n), respectively. Lower adsorption capacity was observed in the ternary system due to the competition of metal ions for available adsorption sites. Desorption and reusability experiments demonstrated the MAAC beads could be used for at least five consecutive adsorption/desorption cycles. These findings suggest the practical use of the MAAC beads as efficient adsorbent for the removal of heavy metals from wastewater.

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页数：12

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