Strontium Removal in Seawater by Means of Composite Magnetic Nanoparticles Derived from Industrial Sludge

被引：23

作者：

Tu, Yao-Jen ^{[1
]}

You, Chen-Feng ^{[2
,3
]}

Zhang, Zhonghao ^{[1
]}

Duan, Yanping ^{[1
]}

Fu, Jing ^{[1
]}

Xu, Di ^{[1
]}

机构：

[1] Shanghai Normal Univ, Inst Urban Study, 100 Guilin Rd, Shanghai 200234, Peoples R China

[2] Natl Cheng Kung Univ, Earth Dynam Syst Res Ctr, 1 Univ Rd, Tainan 701, Taiwan

[3] Natl Cheng Kung Univ, Dept Earth Sci, 1 Univ Rd, Tainan 701, Taiwan

来源：

WATER | 2016年 / 8卷 / 08期

关键词：

composite magnetic particles; industrial sludge; seawater; Sr adsorption; kinetics and thermodynamics; AQUEOUS-SOLUTIONS; ADSORPTIVE REMOVAL; COPPER FERRITE; IRON-OXIDE; METAL IONS; WASTE; EQUILIBRIUM; WATER; SR2+; MONTMORILLONITE;

D O I：

10.3390/w8080357

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Novel composite magnetic nanoparticles (CuFe2O4) were synthesized from industrial sludge by acid leaching, chemical exchange, and ferrite processes in the laboratory. For the first time, these products were applied to investigate the Sr adsorption kinetics and the related thermodynamics in seawater. Rapidly enhanced Sr adsorption was observed when the solution pH changed from 2.61 to 10.25. The maximum adsorption capacity was 23.04 mg.g(-1) at 318 K (pH 10.25). Sr adsorption decreased with the increase of the ionic strength from 0.01 to 0.5 mol.L-1 at pH 2.61-pH 10.25, indicating that the outer-sphere mechanism was involved in the Sr adsorption at the pH interval. This reaction is spontaneous and endothermic, as indicated by the negative change in the standard free energy (Delta G degrees = -5.68, -6.45, and -7.23 kJ.mol(-1) at 298, 308, and 318 K, respectively) and positive Delta H degrees value (2.11 kJ.mol(-1)). The positive Delta S degrees (9.38 mol(-1).K-1) further confirms that the randomness increased at the solid-solution interface during adsorption. These new results indicate that the composite magnetic nanoparticles can be used for the removal of radiogenic Sr-90 nuclide in seawater that was released after the 3/11 earthquake offshore of Japan.

引用

页数：12

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