CIESC Journal ›› 2012, Vol. 20 ›› Issue (3): 505-514.

• 香港科技大学化学与生物分子工程系戈登?麦凯教授退休纪念专刊 • 上一篇    下一篇

阴离子竞争对磁赤铁矿纳米颗粒吸附砷酸盐的影响

T. Tuutijärvi1, E. Repo2, R. Vahala1, M. Sillanpää1,2,3, G. Chen4   

  1. 1 Department of Civil and Environmental Engineering, School of Science and Technology, Aalto University, P.O. Box 15200, FI-00076 Aalto, Finland 2 Laboratory of Green Chemistry, Faculty of Technology, Lappeenranta University of Technology, Patteristonkatu 1, FI-50100 Mikkeli, Finland 3 Laboratory of Applied Environmental Chemistry, Department of Environmental Sciences, University of Eastern Finland, Patteristonkatu 1, FI-50100 Mikkeli, Finland 4 Department of Chemical and Biomolecular Engineering, the Hong Kong University of Science and Technology, Hong Kong, China
  • 收稿日期:2012-02-17 修回日期:2012-03-23 出版日期:2012-06-28 发布日期:2012-03-23

Effect of competing anions on arsenate adsorption onto maghemite nanoparticles

T. Tuutijärvi1, E. Repo2, R. Vahala1, M. Sillanpää1,2,3, G. Chen4   

  1. 1 Department of Civil and Environmental Engineering, School of Science and Technology, Aalto University, P.O. Box 15200, FI-00076 Aalto, Finland 2 Laboratory of Green Chemistry, Faculty of Technology, Lappeenranta University of Technology, Patteristonkatu 1, FI-50100 Mikkeli, Finland 3 Laboratory of Applied Environmental Chemistry, Department of Environmental Sciences, University of Eastern Finland, Patteristonkatu 1, FI-50100 Mikkeli, Finland 4 Department of Chemical and Biomolecular Engineering, the Hong Kong University of Science and Technology, Hong Kong, China
  • Received:2012-02-17 Revised:2012-03-23 Online:2012-06-28 Published:2012-03-23

摘要： This paper reports the effect of several competing anions on arsenate adsorption with maghemite nanoparticles. Sulphate (as SO4), nitrate (as NO3-N), phosphate (as PO4-P) ions and silicate (as SiO2) were studied in dual solution with arsenate. Moreover, the combined effect of ions and other water characteristics were examined with a natural groundwater sample which was spiked with a certain amount of arsenate. Arsenate batch adsorption experiments were carried out with two different kinds of maghemite—a commercially available one and a homemade one using the sol-gel process. Sulphate (≤250 mg•L?1) and nitrate (≤12 mg•L?1) had a negligible effect on the arsenate (0.5 mg•L?1) adsorption at pH 3. However, both phosphate (≤2.9 mg•L?1) and silicate (≤50 mg•L?1) had an adverse impact on arsenate (≤3 mg•L?1) adsorption at pH 7. Phosphate (≤1.5 mg•L?1) showed minimal competition with arsenate (0.5 mg•L?1), while silicate (≤10 mg•L?1) inhibition was insignificant for all studied As(V) concentrations at pH 3. The removal of arsenate from the groundwater sample was as efficient as from laboratory water for 0.5 mg•L?1 As(V) both at pH 3 and pH 7.

关键词: anion effect, groundwater, nitrate, phosphate, silicate, water treatment

Abstract: This paper reports the effect of several competing anions on arsenate adsorption with maghemite nanoparticles. Sulphate (as SO4), nitrate (as NO3-N), phosphate (as PO4-P) ions and silicate (as SiO2) were studied in dual solution with arsenate. Moreover, the combined effect of ions and other water characteristics were examined with a natural groundwater sample which was spiked with a certain amount of arsenate. Arsenate batch adsorption experiments were carried out with two different kinds of maghemite—a commercially available one and a homemade one using the sol-gel process. Sulphate (≤250 mg•L?1) and nitrate (≤12 mg•L?1) had a negligible effect on the arsenate (0.5 mg•L?1) adsorption at pH 3. However, both phosphate (≤2.9 mg•L?1) and silicate (≤50 mg•L?1) had an adverse impact on arsenate (≤3 mg•L?1) adsorption at pH 7. Phosphate (≤1.5 mg•L?1) showed minimal competition with arsenate (0.5 mg•L?1), while silicate (≤10 mg•L?1) inhibition was insignificant for all studied As(V) concentrations at pH 3. The removal of arsenate from the groundwater sample was as efficient as from laboratory water for 0.5 mg•L?1 As(V) both at pH 3 and pH 7.

Key words: anion effect, groundwater, nitrate, phosphate, silicate, water treatment

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