Citation:
ZHU Zhi-Liang, KONG Ling-Gang, MA Hong-Mei, ZHAO Jian-Fu. Adsorption of Chromium (Ⅵ) on Two Iron (Hydr) oxides[J]. Chinese Journal of Applied Chemistry,
;2007, 24(8): 933-936.
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Two iron (hydr) oxides,goethite and akaganeite,were prepared by hydrolysis method.The adsorption of Cr(Ⅵ) on these iron (hydr) oxides from solution was investigated.Both goethite and akaganeite have a high efficiency for the removal of chromium.The adsorption process can be described by Langmuir isotherm model.The maximum adsorption capacities of α-FeO(OH) and β-FeO(OH) were 50.25 mg/g and 42.02 mg/g,respectively.For the solution samples with 10 mg/L Cr(Ⅵ),the residual Cr after treatment by both α-FeO(OH) and β-FeO(OH) can meet the safety standard for drinking water.The effect of coexistent ions on the adsorption was also studied.The presence at 200 mg/L Cl-,200 mg/L SO42- or 100 mg/L F- shows no obvious effect on the adsorption efficiency for Cr(Ⅵ).With the increase of ionic strength,the adsorption efficiency decreases.The presence of 100 mg/L H2PO4- and HCO3sup>- makes the removal efficiency of Cr(Ⅵ) decreased by 15%~20% for the same amount of adsorbent α-FeO(OH) or β-FeO(OH).
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Keywords:
- iron (hydr) oxides,
- chromium,
- adsorption,
- water treatment
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