应用化学 ›› 2023, Vol. 40 ›› Issue (2): 288-298.DOI: 10.19894/j.issn.1000-0518.220169

• 研究论文 • 上一篇    下一篇

不同热解温度下制备的磁性生物炭对罗丹明B的吸附性能

杨倩, 张杨, 赖明阳, 郭琳, 郏建波()   

  1. 五邑大学生物科技与大健康学院,江门 529000
  • 收稿日期:2022-05-06 接受日期:2022-11-06 出版日期:2023-02-01 发布日期:2023-02-27
  • 通讯作者: 郏建波
  • 基金资助:
    国家自然科学基金(21974097);广东省教育厅基金(2020KSYS004)

Adsorption Performance of Rhodamine B on Magnetic Biochar Prepared at Different Pyrolysis Temperatures

Qian YANG, Yang ZHANG, Ming-Yang LAI, Lin GUO, Jian-Bo JIA()   

  1. School of Biotechnology and Health Sciences,Wuyi University,Jiangmen 529000,China
  • Received:2022-05-06 Accepted:2022-11-06 Published:2023-02-01 Online:2023-02-27
  • Contact: Jian-Bo JIA
  • About author:jbjiagu@163.com
  • Supported by:
    the National Natural Science Foundation of China(21974097);the Education Department of Guangdong Province(2020KSYS004)

摘要:

以水稻秸秆为原材料,采用一步磁化碳化法,于550、600、650和700 ℃下进行限氧裂解,制备出4种高效易分离的磁性生物炭(MBC-550、MBC-600、MBC-650和MBC-700)。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、比表面孔径分布分析仪(BET)和傅里叶变换红外光谱仪(FT-IR)对其理化性质进行了表征,探究了不同温度对其结构性质和吸附性能的影响。而后研究了MBC对罗丹明B(RhB)的吸附动力学、吸附等温线,并考察了pH值和金属阳离子(Na+、Fe3+、Mg2+和Cu2+)对吸附性能的影响。结果表明,随着热解温度升高,MBC的比表面积和孔容积增大,MBC的吸附性能受温度影响显著。在30 ℃时,4种不同热解温度制备的MBC对RhB的平衡吸附量分别为35.696、36.962、53.118和54.810 mg/g。4种MBC对RhB的吸附均符合伪二级动力学方程,表明MBC对RhB的吸附受多种因素影响;采用Langmuir与Freundlich方程对等温吸附结果进行拟合,吸附等温线符合Freundlich模型,表明MBC对RhB吸附以多分子层物理吸附为主。由于静电吸附和离子交换的作用,MBC对RhB的吸附容量随pH值的升高先增大后减小,在pH值为6时吸附容量达到最大;加入Na+、Fe3+、Cu2+和Mg2+金属阳离子后,4种MBC对RhB的吸附量均低于平衡吸附量:Na+、Fe3+离子浓度的升高对部分MBC吸附RhB的容量呈一定的上升趋势,而Cu2+、Mg2+离子浓度的升高对MBC吸附RhB影响较小。

关键词: 水稻秸秆, 热解温度, 磁性生物炭, 罗丹明B, 金属阳离子

Abstract:

Using rice straw as the raw material, an one-step magnetization carbonization method is used for oxygen-limited pyrolysis at 550, 600, 650 and 700 ℃ to prepare high-efficient and easy-separable magnetic biochar (MBC). The physicochemical properties of MBC are characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Emmett and Teller analysis (BET) and Fourier transform infrared spectrometer (FT-IR), and the effects of different temperatures on their structural properties and adsorption performances are investigated. The effects of metal cations (Na+, Fe3+, Mg2+, Cu2+) and pH on the adsorption performance are also investigated. The results show that the specific surface area and pore volume of MBC increase with the increase of pyrolysis temperature, and the adsorption ability or capacity of MBC is significantly affected by temperature. The equilibrium adsorption capacities of the four different pyrolysis temperatures are 35.696, 36.962, 53.118 and 54.810 mg/g for Rhodamine B(RhB), respectively. The adsorption of RhB by the four kinds of MBC was in accordance with the pseudo second order kinetic equation, indicating that the adsorption of RhB by MBC was affected by many factors. Langmuir and Freundlich equations were used to fit the isotherm adsorption results, and the adsorption isotherms were in line with Freundlich model, indicating that the adsorption of RhB by MBC was dominated by the physical adsorption of multi molecular layers. The adsorption capacity of MBC on RhB increases and then decreases with the increase of pH due to electrostatic adsorption and ion exchange, and reaches the maximum capacity at pH 6. After the addition of Na+, Fe3+, Cu2+, Mg2+ metal cations, the adsorption capacities of the four kinds of MBC for RhB are all lower than the equilibrium adsorption capacities. The increase of Na+ and Fe3+ ion concentrations has a certain upward trend on the adsorption capacity of some MBC for RhB. However, the increase of Cu2+ and Mg2+ ion concentrations has little effect on the adsorption of RhB by MBC.

Key words: Rice straw, Pyrolysis temperature, Magnetic biochar, Rhodamine B, Metal cation

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