Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Colloids Surf B Biointerfaces. 2011 Feb 1;82(2):456-62. doi: 10.1016/j.colsurfb.2010.10.002. Epub 2010 Oct 8.
The biosorption characteristics of cations and anions from aqueous solution using polyethylenimine (PEI) modified aerobic granules were investigated. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis exhibit the presence of PEI on the granule surface. Compared with the raw granule, the modified aerobic granules with PEI showed a significant increase in sorption capacity for both metal ions. The monolayer biosorption capacity of granules for Cu(II) and Cr(VI) ions was found to be 71.239 and 348.125mg/g. The optimum solution pH for adsorption of Cu(II) and Cr(VI) from aqueous solutions was found to be 6 and 5.2, respectively. The biosorption data fitted better with the Redlich-Peterson isotherm model. FTIR showed chemical interactions occurred between the metal ions and the amide groups of PEI on the biomass surface. XPS results verified the presence of Cr(III) on the biomass surface, suggesting that some Cr(VI) anions were reduced to Cr(III) during the sorption.
采用聚乙烯亚胺（PEI）改性好氧颗粒，研究了阳离子和阴离子从水溶液中的生物吸附特性。傅里叶变换红外（FTIR）和 X 射线光电子能谱（XPS）分析表明 PEI 存在于颗粒表面。与原颗粒相比，PEI 改性的好氧颗粒对金属离子的吸附容量有显著提高。颗粒对 Cu(II)和 Cr(VI)离子的单层生物吸附容量分别为 71.239 和 348.125mg/g。发现吸附 Cu(II)和 Cr(VI)从水溶液中的最佳溶液 pH 值分别为 6 和 5.2。生物吸附数据更符合 Redlich-Peterson 等温模型。FTIR 表明，金属离子与生物质表面 PEI 的酰胺基团之间发生了化学相互作用。XPS 结果证实了生物质表面存在 Cr(III)，表明在吸附过程中部分 Cr(VI)阴离子被还原为 Cr(III)。
