Enhanced Cu(II) and Cr(VI) biosorption capacity on poly(ethylenimine) grafted aerobic granular sludge
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- 作者：Xue-Fei Sun ; Chuanyong Liu ; Yue Ma ; Shu-Guang Wang ; Bao-Yu Gao ; Xiao-Ming Li
- 关键词：PEI-modified aerobic granules ; Copper ; Chromium ; XPS analysis
- 刊名：Colloids and Surfaces B: Biointerfaces
- 出版年：2011
- 出版时间：1 February 2011
- 年：2011
- 卷：82
- 期：2
- 页码：456-462
- 全文大小：696 K
文摘
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 348.125 mg/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.