Journal
CHEMICAL ENGINEERING JOURNAL
Volume 234, Issue -, Pages 80-87Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.08.061
Keywords
Natural goethite; Nanoscale particles; Zero valent iron; Phosphate removal
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Funding
- Natural Science Foundation of China [41130206, 41072036, 41172048]
- Ph.D. Programs Foundation of Ministry of Education of China [20110111110003]
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology
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Nano zero valent iron (NZVI) prepared by reducing natural goethite in hydrogen at 550 C was used to remove phosphate. The effect of particle size, reaction time, NZVI dose, pH, initial phosphorus concentration, and oxygen amount in reaction system on phosphorus removal was investigated. The characterization of X-ray fluorescence (XRF), X-ray diffraction (XRD), N-2 adsorption and desorption (BET analysis), transmission electron microscope (TEM), field emission scanning electron microscope with a energy dispersive X-ray detector (FESEM/EDS) and X-ray photoelectron spectroscopy (XPS) indicated that nanoscale of iron (around 80-150 nm length and 5-30 nm width) was prepared successfully with high dispersion and relative large surface area around 22 m(2)/g. The results of batch experiments and XPS analysis suggested that this kind of NZVI had a good performance on removal of phosphate (over 99%) despite in slightly acidic media as the initial concentration of P was 5 mg/L. The reason was ascribed to the effective corrosion of this NZVI under the function of proton and dissolved oxygen in spite of the existence of thin passive films. (C) 2013 Elsevier B.V. All rights reserved.
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