高锰酸钾改性黄芪废渣活性炭对Cd2+的吸附

来源期刊:中国有色金属学报(英文版)2018年第4期

论文作者:冯宁川 范玮 朱美霖 郭学益

文章页码:794 - 801

关键词:黄芪废渣;活性炭;改性;吸附;Cd2+

Key words:Astragalus residue; activated carbon; modification; adsorption; Cd2+

摘    要:以黄芪废渣为原料,用KOH为活化剂制备黄芪废渣活性炭,并用KMnO4改性,改性前后的黄芪废渣活性炭用于对水溶液中Cd2+的吸附。采用扫描电子显微术、比表面积测定、X射线衍射、红外光谱和贝母滴定等方法对改性前后的黄芪废渣活性炭进行表征;通过静态吸附实验考察改性前后黄芪废渣活性炭对水溶液中Cd2+的吸附性能。结果表明,KMnO4改性后活性炭表面含氧官能团增加,MnO2沉积到活性炭表面。改性前后的黄芪废渣活性炭对Cd2+的吸附符合准二级动力学方程,等温吸附更符合Langmuir模型,改性前后的黄芪废渣活性炭对Cd2+的饱和吸附量分别是116.96和217.00 mg/g。KMnO4显著改变了黄芪废渣活性炭的物理化学性质和表面结构,改性后的黄芪废渣活性炭对Cd2+的吸附能力明显提高。

Abstract: Activated carbon obtained from Astragalus residue was chemically activated by KOH and modified with KMnO4. The samples were characterized by N2 adsorption, Fourier transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and Boehm titration. Accordingly, the original and modified carbon materials were used for the removal of Cd2+ from aqueous solution by batch adsorption experiments. Results showed that the contents of oxygen-containing functional groups increased, and MnO2 was nearly uniformly deposited on the surface of activated carbon after modification by KMnO4. The adsorption kinetics was described by pseudo-second order model. Langmuir model fitted the adsorption-isotherm experimental data of Cd2+ better than the Freundlich model. The maximum adsorption capacities of the activated carbon before and after modification for Cd2+ were 116.96 and 217.00 mg/g, respectively. KMnO4 considerably changed the physicochemical properties and surface texture of activated carbon and enhanced the adsorption capacity of activated carbon for Cd2+.

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号