针铁矿改性生物炭的制备及对Cr (Ⅵ)的吸附性能研究

王梓婷; 邹家伟; 周集体; 金若菲

doi:10.13205/j.hjgc.202211014

针铁矿改性生物炭的制备及对Cr (Ⅵ)的吸附性能研究

doi: 10.13205/j.hjgc.202211014

大连理工大学环境学院, 辽宁大连 116024

详细信息

作者简介:
王梓婷(1997-),女,硕士研究生,主要研究方向为重金属污染修复。wangziting08@163.com

通讯作者:
金若菲(1975-),女,博士,副教授,主要研究方向为水污染控制工程。jin_ruofei@163.com

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- 文章访问数: 165
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- 被引次数: 0
出版历程
- 收稿日期: 2022-01-04
- 网络出版日期: 2023-03-24

PREPARATION OF GOETHITE-MODIFIED BIOCHAR AND ITS ADSORPTION CAPACITY ON Cr(Ⅵ)

School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 在不同热解温度及原料配比条件下，采用水解共沉淀方法制备针铁矿改性生物炭材料（GMB），借助SEM-EDS、XRD、FTIR、XPS进行表征，并进行Cr （Ⅵ）吸附实验，探究吸附性能和机理。结果表明：1）经改性后生物炭表面生成了羟基氧化铁（FeOOH），吸附能力有大幅提升；2）热解温度为600℃，生物炭与Fe （NO₃）₃·9H₂O的质量比为1：12时制备的GMB600-12表现出最佳吸附性能，最大吸附容量为20.67 mg/g；3）准二级动力学揭示Cr （Ⅵ）的吸附以化学吸附为主，Langmuir和Freundlich模型都能很好地描述GMB对Cr （Ⅵ）的吸附特征；4） XPS的结果进一步表明GMB去除水溶液中Cr （Ⅵ）是氧化还原和表面吸附协同作用的结果。
- 生物炭 /
- 针铁矿 /
- Cr (Ⅵ) /
- 吸附
Abstract: Goethite-modified biochar (GMB) was prepared by hydrolytic co-precipitation under different pyrolysis temperatures and raw material ratios, characterized by SEM-EDS, XRD, FTIR and XPS. Adsorption experiments of Cr(Ⅵ) for exploring the adsorption performance and mechanism were carried out. The results showed that:1) modification with goethite formed iron hydroxyl oxide (FeOOH) on the surface of biochar and greatly improved its adsorption capacity; 2) the best adsorption capacity of 20.67 mg/g was performed by modified biochar GMB600-12 with pyrolysis temperature at 600℃ and mass ratio of biochar and Fe(NO₃)₃·9H₂O at 1:12; 3) the adsorption of Cr(Ⅵ) was mainly chemisorption as revealed by quasi-second-order kinetics, and both Langmuir model and Freundlich model could well describe the adsorption characteristics of Cr(Ⅵ) by GMB; 4) the removal of Cr(Ⅵ) from aqueous solution by GMB is a synergistic effect of redox and surface adsorption.
- biochar /
- goethite /
- Cr(Ⅵ) /
- absorption

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