污染控制技术及原理
许旭萍,沈雪贤,陈宏靖.球衣菌吸附重金属Hg2+的理化条件及其机理研究[J].环境科学学报,2006,26(3):453-458
球衣菌吸附重金属Hg2+的理化条件及其机理研究
- Study on biosorption mechanism and physiochemical conditions of Hg2+ by Sphaerotilus natans
- 基金项目：福建省教育厅资助项目(No.HA03034;JB02159)
- 作者
- 单位
- 许旭萍
- 福建师范大学生命科学学院, 福州 350007
- 沈雪贤
- 福建师范大学生命科学学院, 福州 350007
- 陈宏靖
- 福建省疾病预防控制中心, 福州 350002
- 摘要：采用球衣菌(Sphaerotilusnatans)FQ32为生物吸附剂,研究了初始离子浓度、吸附剂用量、菌龄、pH值、温度和吸附时间等理化因素对其吸附重金属Hg2+的影响,并进一步研究了吸附机理.结果表明,球衣菌在Hg2+浓度为16mg·L-1、吸附剂用量0.4g·L-1、菌龄16h、pH7、温度30℃、吸附时间90min时的优化条件下,对Hg2+的吸附量为72.86mg·g-1
- Abstract：The Sphaerotilus natans FQ32 was used as bio-sorbent, the effect of series factors such as the initial concentration of Hg2+, biomass concentration, the culture time of the bacteria, pH value, temperature and the adsorption time on the adsorbing to Hg2+ were determined, and the adsorption mechanism was further discussed. The results showed that the maximum adsorption capacity for Hg2+ of S. natans was reached 72.86 mg·g-1 dry biomass under the optimal conditions with the Hg2+ concentration of 16mg·L-1, the bacteria cultured after 16hrs with the biomass of 0.4 g·L-1, and incubation at 30℃, pH 7 for 90 mins. The kinetic study of the adsorption showed that Hg2+ uptake was reached to 74.10% of the total uptake in the initial 5 minutes, and finished in 90 minutes. The adsorption process was well accorded with the Langmuir model. The analysis of the isotherm model, TEM and IR spectrum indicated that the combination of the Hg2+ with the active groups in the cell wall of S. natans was the main biosorption mechanism.
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