期刊
CHEMICAL ENGINEERING JOURNAL
卷 158, 期 3, 页码 599-607出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.02.013
关键词
Magnetic nanomaterials; Arsenic; Adsorption; Desorption; Surface hydroxyl
资金
- National Basic Research Program of China [2009CB421605]
- National High Technology Research and Development Program of China [2007AA06A407]
- National Natural Science Foundation of China [20877079, 20921063]
Bimetal oxide magnetic nanomaterials (MnFe2O4 and CoFe2O4) were synthesized and characterized with transmission electron microscope (TEM), X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). The adsorption of arsenic on these nanomaterials was studied as a function of pH, initial arsenic concentration, contact time and coexisting anions. The Langmuir and Freundlich isotherm models were applied to fit the adsorption data, and the maximum adsorption capacities of arsenite (As-III) and arsenate (As-V) on MnFe2O4 were 94 and 90 mg g(-1). and on CoFe2O4 were 100 and 74 mg g(-1), respectively. MnFe2O4 and CoFe2O4 showed higher As-III and As-V adsorption capacities than the referenced Fe3O4 (50 and 44 mg g(-1), respectively) prepared by the same procedure. Quantificational calculation from XPS narrow scan results of O(1s) spectra of adsorbents indicated that the higher adsorption capacities of As-III and As-V on MnFe2O4 and CoFe2O4 than on Fe3O4 might be caused by the increase of the surface hydroxyl (M-OH) species. Phosphate and silicate were powerful competitors with arsenic for adsorptive sites on the adsorbent. Desorption study showed that over 80% of As-III and 90% of As-V could be clesorbed from MnFe2O4 with 0.1 M NaOH solution. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据