Effective removal of phosphate from aqueous solution using humic acid coated magnetite nanoparticles

被引:130
作者
Rashid, Mamun [1 ]
Price, Nathaniel T. [1 ]
Gracia Pinilla, Miguel Angel [2 ]
O'Shea, Kevin E. [1 ]
机构
[1] Florida Int Univ, Dept Chem & Biochem, 11200,SW 8th St, Miami, FL 33199 USA
[2] UANL, Fac Ciencias Fis Matemat, Ciudad Univ, San Nicolas De Los Garza 66455, NL, Mexico
基金
美国国家科学基金会;
关键词
Humic acid coated magnetite nanoparticles; Adsorption; Magnetic separation; Phosphate; IRON-OXIDE NANOPARTICLES; WASTE-WATER TREATMENT; PHOSPHORUS REMOVAL; CONGO-RED; ADSORPTION; EQUILIBRIUM; ADSORBENT; SORBENTS; BENTONITE;
D O I
10.1016/j.watres.2017.06.085
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Effective removal of excess phosphate from water is critical to counteract eutrophication and restore water quality. In this study, low cost, environmentally friendly humic acid coated magnetite nano particles (HA-MNP) were synthesized and applied for the remediation of phosphate from aqueous media. The HA-MNPs, characterized by FTIR, TEM and HAADF-STEM showed the extensive coating of humic acid on the magnetite surface. The magnetic nanoparticles with diameters of 7-12 nm could be easily separated from the reaction mixture by using a simple hand held magnet. Adsorption studies demonstrate the fast and effective separation of phosphate with maximum adsorption capacity of 28.9 mg/g at pH 6.6. The adsorption behavior follows the Freundlich isotherm suggesting the formation of nonuniform multilayers of phosphate on the heterogeneous surface of HA-MNP. The adsorption kinetic fits the pseudo-second order model well with rate constants of 0.206 +/- 0.003, 0.073 +/- 0.002 and 0.061 +/- 0.003 g mg(-1) min(-1) for phosphate (P) concentrations of 2, 5 and 10 mg/L respectively. The removal of phosphate was found higher at acidic and neutral pH compared to basic conditions. The nanoparticles exhibit good selectivity and adsorption efficiency for phosphate in presence of co-existing ions such as Cl-, SO42- and NO3- with some inhibition effect by CO32-. The effect of temperature on the adsorption reveals that the process is endothermic and spontaneous. HA-MNPs are promising, simple, environmentally friendly materials for the removal of phosphate from aqueous media. (C) 2017 Published by Elsevier Ltd.
引用
收藏
页码:353 / 360
页数:8
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