College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China.
Bioresour Technol. 2010 Aug;101(15):5820-6. doi: 10.1016/j.biortech.2010.03.013. Epub 2010 Mar 23.
Corn stalk was modified using graft copolymerization to produce absorbent (AGCS), which was characterized by elemental analysis, fourier transform infrared, X-ray diffraction, solid-state CP/MAS (13)C NMR spectra, thermogravimetric analysis and differential scanning calorimeter. AGCS, having cyano group (-CN) after grafted successfully, exhibits more high adsorption potential for Cd(II) than unmodified forms. The efficiency of AGCS for removal of cadmium ions was evaluated. Factors affecting Cd(II) adsorption such as pH value and adsorbent dosage were investigated. More than 90% removal was achieved at pH 3.0-7.0 and the adsorption increased from 16.0% to 99.2% with increase of adsorbent dose. In addition, two isotherm models, namely, Langmuir and Freunlich were also analyzed to determine the best fit equation for adsorption of Cd(II) on AGCS.
玉米秸秆经过接枝共聚反应改性生成了一种具有高吸附能力的吸水材料（AGCS），利用元素分析、傅里叶变换红外光谱、X 射线衍射、固态 CP/MAS（13）C NMR 谱、热重分析和差示扫描量热法对其进行了表征。AGCS 接枝成功后含有氰基（-CN），对 Cd(II) 的吸附潜力明显高于未改性的形式。对 AGCS 去除镉离子的效率进行了评估。考察了影响 Cd(II)吸附的因素，如 pH 值和吸附剂用量。在 pH 值为 3.0-7.0 时，去除率超过 90%，随着吸附剂用量的增加，吸附率从 16.0%增加到 99.2%。此外，还分析了两种等温模型，即 Langmuir 和 Freundlich，以确定用于 AGCS 吸附 Cd(II)的最佳拟合方程。
