Abstract: N,N-dimethylformamide and ethylenediamine as modifiers have been used for the preparation of the modified vetiver adsorbent,and characterized by fourier transform infrared spectroscopy(FTIR) and scanning electron microscope(SEM). The results show that the modified vetiver can bring in more amine,its surface activity is improved,and its adsorption effect is improved obviously. When the dosage of modified vetiver is 3.00 g/L,adsorption time 100 min,temperature 314 K,pH is 2,and initial mass concentration of Cr⁶⁺ 100 mg/L,the adsorption capacity is as high as 72.87 mg/g,and removing rate 97.81%. The dynamic adsorption equilibrium of modified vetiver adsorption for Cr⁶⁺ is in accordance with the pseudo-second-order kinetics model,and the isothermal adsorption conforms to Langmuir adsorption isothermal model.

Key words: modification of vetiver, hexavalent chromium ions, adsorption

摘要： 以N，N-二甲基甲酰胺和乙二胺为改性剂制备出改性香根草吸附剂，用傅里叶变换红外光谱（FTIR）和扫描电镜（SEM）对改性前后的香根草进行表征，结果表明：改性后的香根草引入了更多胺基且其表面活性提高，吸附效果明显改善。在改性香根草用量为3.00 g/L，吸附时间为100 min，温度为314 K，pH为2，Cr⁶⁺初始质量浓度为100mg/L时，Cr⁶⁺吸附量为72.87 mg/g，Cr⁶⁺去除率达97.81%。改性香根草吸附Cr⁶⁺的动态吸附平衡符合伪二级动力学模型，等温吸附符合Langmuir吸附等温模型。

关键词: 香根草改性, 六价铬, 吸附

CLC Number: 

• X703.1