Magnetic magnetite (Fe3O4) nanoparticle synthesis and applications for lead (Pb2+) and chromium (Cr6+) removal from water

被引：624
作者：
Rajput, Shalini [1 ]
Pittman, Charles U., Jr. [2 ]
Mohan, Dinesh [1 ]
机构：
[1] Jawaharlal Nehru Univ, Sch Environm Sci, New Delhi 110067, India
[2] Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2016年 / 468卷
关键词：
Adsorption; Co-precipitation method; Removal; magnetite nanoparticles; Wastewater treatment; lead and chromium removal; IRON-OXIDE NANOPARTICLES; HEAVY-METAL IONS; WASTE-WATER; HEXAVALENT CHROMIUM; AQUEOUS-SOLUTION; FAST PYROLYSIS; CONTAMINATED WATER; PARTICLE-SIZE; CU II; ADSORPTION;
D O I：
10.1016/j.jcis.2015.12.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Magnetic magnetite (Fe3O4) nanoparticles synthesized by chemical co-precipitation were characterized using XRD, TEM, SEM-EDX, FT-IR, ED-XRF, PPMS, point of zero charge (pH(pzc)) and surface area measurements. As-prepared Fe3O4 nanoparticles were successful for aqueous Cr6+ and Pb2+ removal. Batch adsorption experiments systematically investigated the influence of pH, temperature, contact time and adsorbate/adsorbent concentration on Cr6+ and Pb2+ adsorption. Maximum Cr6+ and Pb2+ removal occurred at pH 2.0 and 5.0, respectively. Sorption data fit pseudo-second order kinetics, indicating a chemical adsorption. The Freundlich, Langmuir, Redlich-Peterson, Toth, Radke and Sips adsorption isotherm models were applied to describe equilibrium data. The Sips and Langmuir models best described Cr6+ and Pb2+ adsorption on magnetite nanoparticles, respectively. The maximum Langmuir adsorption capacities were 34.87 (Cr6+ and 53.11 (Pb2+) mg/g at 45 degrees C, respectively. Fe3O4 nanoparticles are promising potential adsorbents and exhibited remarkable reusability for metal ions removal in water and wastewater treatment. (C) 2015 Elsevier Inc. All rights reserved.
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页码：334 / 346
页数：13
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