| 1 | 阴离子竞争对磁赤铁矿纳米颗粒吸附砷酸盐的影响(英文)显示文摘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. | T.Tuutijrvi E.Repo R.Vahala M.Sillanp G.Chen | 2012 | Chinese Journal of Chemical Engineering2012，20，3： | 3 |
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