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氨化改性小麦秸秆对水体Cd 2+的吸附性能研究

李志琳,  解宇峰,  程德义,  王磊,  石佳奇,  祝欣

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文章导航 > 环境工程技术学报  > 2019 >  9(5): 566-572
李志琳, 解宇峰, 程德义, 王磊, 石佳奇, 祝欣. 氨化改性小麦秸秆对水体Cd 2+的吸附性能研究[J]. 环境工程技术学报, 2019, 9(5): 566-572. doi: 10.12153/j.issn.1674-991X.2019.04.010
引用本文: 李志琳, 解宇峰, 程德义, 王磊, 石佳奇, 祝欣. 氨化改性小麦秸秆对水体Cd 2+的吸附性能研究[J]. 环境工程技术学报, 2019, 9(5): 566-572. doi: 10.12153/j.issn.1674-991X.2019.04.010
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LI Zhilin, XIE Yufeng, CHENG Deyi, WANG Lei, SHI Jiaqi, ZHU Xin. Adsorption properties of ammonia-modified wheat straw on aquatic cadmium[J]. Journal of Environmental Engineering Technology, 2019, 9(5): 566-572. doi: 10.12153/j.issn.1674-991X.2019.04.010
Citation: LI Zhilin, XIE Yufeng, CHENG Deyi, WANG Lei, SHI Jiaqi, ZHU Xin. Adsorption properties of ammonia-modified wheat straw on aquatic cadmium[J]. Journal of Environmental Engineering Technology, 2019, 9(5): 566-572. doi: 10.12153/j.issn.1674-991X.2019.04.010
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氨化改性小麦秸秆对水体Cd 2+的吸附性能研究

doi: 10.12153/j.issn.1674-991X.2019.04.010
  • 1.

    生态环境部南京环境科学研究所,江苏 南京 210042

  • 2.

    南京农业大学资源与环境科学学院,江苏 南京 210095

详细信息
    作者简介:

    李志琳(1994—),女,硕士研究生,研究方向为污染土壤修复与水污染治理, 1170624232@qq.com

    通讯作者:

    解宇峰 E-mail: pkuyufeng@163.com

  • 中图分类号: X703.1

Adsorption properties of ammonia-modified wheat straw on aquatic cadmium

  • 1.

    Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China

  • 2.

    College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China

More Information
    Corresponding author: Yufeng XIE E-mail: pkuyufeng@163.com

    摘要
  • 摘要: 利用尿素溶液氨化改性小麦秸秆,通过扫描电镜和傅里叶变换红外光谱观察其改性前后的表征,研究不同初始pH与投加浓度对改性前后小麦秸秆吸附水溶液中Cd 2+的效果,并通过动力学与热力学模型拟合小麦秸秆的吸附动力学与等温吸附特征。结果表明:氨化改性小麦秸秆的结构疏松,孔隙增大,表面嫁接了伯酰胺基团,各官能团活性增强,有利于提高对Cd 2+的吸附能力;氨化改性小麦秸秆吸附Cd 2+的最适宜条件是pH为6、温度为25 ℃、吸附剂投加浓度为1/300 g/mL,此条件时对Cd 2+的吸附率达74.32%,最大饱和吸附量为11.29 mg/g;不同温度下,氨化改性小麦秸秆对Cd 2+的吸附可用准二级动力学方程描述,表现为吸热反应;对Cd 2+的吸附热力学过程可用Langmuir模型描述,表现为以化学吸附为主。

     

    Abstract: In order to solve the problem of chromium-contaminated wastewater, urea ammoniated modified wheat straw was prepared as a kind of Cd 2+ sorbent. The characterization before and after modification was observed by scanning electron and Fourier transform infrared spectroscopy, and the effects of different initial pH and dosage concentration on adsorption capacity of Cd 2+ by wheat straw before and after modification were studied. The adsorption kinetics and isothermal characteristics of wheat straw were fitted by kinetic and thermodynamic models. The results showed that the structure of the ammoniated wheat straw (N1) was loose, the pores were enlarged, the surface was grafted with primary amide group, and the activity of each functional group was enhanced, which was conducive to improving the adsorption capacity of Cd 2+. The optimum conditions for Cd 2+ adsorption on wheat straw after ammoniation modification were pH of 6, temperature of 25 ℃ and sorbent dosage of 1/300 g/mL. Under these conditions, the removal rate and the biggest saturated adsorption capacity were 74.32% and 11.29 mg/g, respectively. At different temperatures, the adsorption kinetics of Cd 2+ on wheat straw modified by ammonia could be described by the quasi-second order kinetic equation, which was shown as the endothermic reaction. The thermodynamic process could be described by Langmuir model, indicating that the adsorption on Cd 2+ was dominated by chemical adsorption.

     

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  • 收稿日期:  2018-11-14
  • 刊出日期:  2019-09-20

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