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Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4
Zhang, Shengxiao; Niu, Hongyun; Cai, Yaqi; Zhao, Xiaoli; Shi, Yali
2010-04-15
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume158Issue:3Pages:599-607
AbstractBimetal 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.
Department环境化学与生态毒理学国家重点实验室
KeywordMagnetic Nanomaterials Arsenic Adsorption Desorption Surface Hydroxyl
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Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/21043
Collection环境化学与生态毒理学国家重点实验室
Recommended Citation
GB/T 7714
Zhang, Shengxiao,Niu, Hongyun,Cai, Yaqi,et al. Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4[J]. CHEMICAL ENGINEERING JOURNAL,2010,158(3):599-607.
APA Zhang, Shengxiao,Niu, Hongyun,Cai, Yaqi,Zhao, Xiaoli,&Shi, Yali.(2010).Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4.CHEMICAL ENGINEERING JOURNAL,158(3),599-607.
MLA Zhang, Shengxiao,et al."Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4".CHEMICAL ENGINEERING JOURNAL 158.3(2010):599-607.
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