满江红干体对锌离子的生物吸附
Biosorption of Zn (Ⅱ) by dried Azolla imbricata biomass
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摘要: 以满江红干体为生物吸附剂，研究了不同条件下对废水中Zn2+的净化作用。结果表明，满江红干体对Zn2+的吸附是一个快速的过程，前5 min的吸附量达到最大吸附量的62.9%，30 min达到吸附平衡；初始pH值对Zn2+的吸附有显著的影响，最适pH值为6；随着干体量的增加，吸附率逐渐提高而吸附量则降低；随着Zn2+初始浓度的增加，吸附率逐渐降低而吸附量则提高。满江红干体对Zn2+的吸附符合Langmuir吸附等温线方程，最大吸附容量达57.5 mg/g。5次吸附解吸循环实验数据表明，重复次数和再生处理对满江红干体的吸附能力没有产生显著影响。因此，满江红干体在处理含Zn2+废水中的重复使用是可行的。Abstract: The dried A. imbricata biomass as a biosorbent for the removal of Zn2+ from aqueous solution under various experimental conditions was investigated. This study showed that the kineties of biosorption was relatively fast, about 62.9% of the biosorption occurred within 5 min and equilibrium was attained within 30 min. The initial pH of solution strongly affected the metal biosorption, with pH 6 being identified as the optimal condition. The adsorption capacity increased with the increasing of the initial Zn2+ concentration of the solution, while decreased with the increasing of the adsorbent dosage. The adsorption isotherm followed the Langmuir isotherm where the maximum adsorption capacities onto A. imbricata was 57.5 mg/g for Zn2+. The data from five biosorption-desorption cycles indicated that the biosorption capacity of the biomass was not much affected by repeated operations and regeneration process. The reusability of A. imbricata biomass in the treatment of Zn2+-laden wastewater is viable.
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Key words:
- Zn2+ /
- A. imbricata /
- biosorption
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