胶质芽孢杆菌对重金属Cr(Ⅵ)的吸附

Adsorption of Cr(Ⅵ) by Colloid Bacillus

以胶质芽孢杆菌微生物吸附剂为研究对象,探究了其对模拟废水中铬的吸附。分析了pH、铬初始质量浓度、吸附时间以及吸附温度对吸附的影响,得出了最优吸附条件:细菌培养物添加量10%,铬初始质量浓度为20 mg/L,pH5.0,吸附温度为20℃,吸附时间20 min,此时吸附率高达82.9%,最大吸附量为257 mg/L。Langmuir吸附模型能够很好地解释吸附过程。傅里叶红外光谱仪(FTIR)和扫描电子显微镜(SEM)分析表明:吸附重金属后,吸附剂表面官能团与表面结构发生了变化。

Taking the microbial adsorbent of Bacillus mucilaginosus as the object of study,the biosorption of Cr(Ⅵ) from aqueous solution by Bacillus mucilaginosus was investigated. The effects of p H,initial concentrations of Cr(Ⅵ),adsorption time,and temperature on adsorption were studied. The experimental results show that the optimum biosorption can be reached in 20 min under the conditions of T = 20 ℃,p H = 5,ρ( Cr) = 20 mg / L. 82. 9% of Cr(Ⅵ) is adsorbed and the maximum adsorption capacity is 257 mg / L. The experimental data is well fitted by the Langmuir model. Analysis of Fourier transform infrared spectroscopy( FTIR) and scanning electron microscope( SEM) show that functional groups and surface structure are changed after adsorption.