Magnetite-hematite nanoparticles prepared by green methods for heavy metal ions removal from water

被引:122
作者
Ahmed, M. A. [1 ]
Ali, S. M. [2 ]
El-Dek, S. I. [1 ]
Galal, A. [2 ]
机构
[1] Cairo Univ, Fac Sci, Dept Phys, Giza, Egypt
[2] Cairo Univ, Fac Sci, Dept Chem, Giza, Egypt
来源
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2013年 / 178卷 / 10期
关键词
Magnetite-hematite; Nanoparticles; Microwave; Adsorption; Water decontamination; AQUEOUS-SOLUTIONS; ADSORPTION CHARACTERISTICS; SELECTIVE ADSORPTION; ACTIVATED CARBON; CD(II) IONS; PB(II); WASTE; COMPOSITE; CR(III); CADMIUM;
D O I
10.1016/j.mseb.2013.03.011
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mixed magnetite hematite nanoparticles were synthesized via different routes such as, coprecipitation in air and N-2 atmosphere, citrate nitrate, glycine nitrate and microwave-assisted citrate methods. The prepared samples were characterized by X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), BET measurements and magnetic hysteresis. XRD data showed the formation of magnetite hematite.mixture with different compositions according to the synthesis method. The particle size was in the range of 4-52 nm for all the prepared samples. From HRTEM micrographs, it was found that, the synthesis method affects the moropholgy of the prepared samples in terms of crystallinity and porosity. The magnetite hematite mixture was employed as a sorbent material for removal of some heavy metal ions from water such as lead(II), cadmium(II) and chromium(III). The effects of pH value and the contact time on the adsorption process were studied and optimized in order to obtain the highest possible adsorption efficiency of the magnetite hematite mixture. The effect of the synthesis method of the magnetite hematite mixture on the adsorption process was also investigated. It was found that samples prepared by the coprecipitation method had better adsorption efficiency than those prepared by other combustion methods. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:744 / 751
页数:8
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