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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 621
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    • شماره تماس دبیرخانه رویداد: -
     cadmium is the most common toxic metal threatening safe rice supply. rice straw has the potential to remove cd from large-scale effluent contaminated by heavy metals since it exhibited a short biosorption equilibrium time of 5 min, high biosorption capacity (13.9 mg g-1) and high removal efficiency at a ph range of 2.0–6.0. the main cd biosorption mechanism was cd2+ ion exchange with k+, na+, mg2+ and ca2+, together with chelation with functional groups such as c==c, c--o, o--h and carboxylic acids. when 0.5% (w/v) rice straw was exposed to 50 mg ml-1 cdso4 solution with shaking at 150 r min-1 for 3 h, about 80% of the aquatic cd was absorbed and the cd content in rice straw reached 8–10 mg g-1, suggesting that the metal-enriched rice straw could become high quality bio-ore by virtue of the industrial mining grade of its metal content and easy metal recovery.

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