胞外聚合物对水中Cd(Ⅱ)的吸附性能研究
Study on adsorption performances of Cd(II) by extracellular biopolymer substances
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摘要: 以Pseudomonas fluorescens C-2产生的胞外聚合物PF-2作为新型生物吸附剂,以傅里叶变换红外光谱( FTIR) 对其进行表征。系统地研究了胞外聚合物PF-2对水中Cd(II)的吸附行为。结果表明,在pH值为6.0,该吸附剂对水中的Cd(II)具有很强的吸附能力。聚合物PF-2对Cd(Ⅱ)的吸附较易进行,吸附等温线能较好地用Langmuir模型来描述,最大单分子层吸附量为33.50 mg/g,吸附动力学很好地符合准二级动力学模型。胞外聚合物PF-2含有的主要官能团为羧基、羟基和氨基等,其中羧基、羟基参与了Cd(Ⅱ)的吸附。结果表明利用胞外聚合物PF-2去除环境水样中的Cd(Ⅱ)是可行的。Abstract: The new extracellular biopolymer substances PF-2 produced from Pseudomonas fluorescens C-2 was used as biosorbent, and characterized using Fourier transform infrared spectrophotometer (FTIR). The adsorption behavior of the extracellular biopolymer substances PF-2 for Cd(II) was investigated. The results showed that the optimum pH was 6.0. Biosorption equilibrium data were better described by Langmuir isotherm model, and maximum monolayer adsorption capacity was 33.50 mg/g. The kinetic data were fitted with the pseudo-second-order. The carboxyl, hydroxyl groups of the PF-2 were involved in chemical interaction with the Cd(II) ions depicted by Fourier transform infrared spectroscopic (FTIR) results. The study showes the potential of extracellular biopolymer substances PF-2 as an effective biosorbent for the removal of Cd(Ⅱ) from environmental and industrial wastewater.
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Key words:
- extracellular biopolymer substances /
- Cd(II) /
- biosorption /
- wastewater treatment
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