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-studi...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 orocess. Sulohate （≤250 mg.L-1） and nitrate （≤ 12 mg.L-1） had a neglivible effect onthe arsenate （0.5 mg.L-1） adsorption at pH 3. However, both phosphate （42.9 mg·L-1） and silicate （450 mg.L-j） had an adverse impact on arsenate （43 mg.L-1） adsorption at pH 7. Phosphate （41.5 mg.L-1） showed minimal competition with arsenate （0.5 mg.L-1）, while silicate （410 mg.L-1） inhibition was insignificant for all studied As（V） concentrations at p.H 3. The removal of arsenate from the groundwater sample was as efficient as from labo-ratory water tor 0.3 mgL -1 AS（V） botll at pH3 and pH7.展开更多
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 orocess. Sulohate （≤250 mg.L-1） and nitrate （≤ 12 mg.L-1） had a neglivible effect onthe arsenate （0.5 mg.L-1） adsorption at pH 3. However, both phosphate （42.9 mg·L-1） and silicate （450 mg.L-j） had an adverse impact on arsenate （43 mg.L-1） adsorption at pH 7. Phosphate （41.5 mg.L-1） showed minimal competition with arsenate （0.5 mg.L-1）, while silicate （410 mg.L-1） inhibition was insignificant for all studied As（V） concentrations at p.H 3. The removal of arsenate from the groundwater sample was as efficient as from labo-ratory water tor 0.3 mgL -1 AS（V） botll at pH3 and pH7.
