| 改性烟末生物质吸附剂对水中NO3-的吸附特性与机理 |
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| 引用本文： | 康四军,杨金辉,杨斌,谢水波,王劲松,黎传书.改性烟末生物质吸附剂对水中NO3-的吸附特性与机理[J].农业环境科学学报,2018,37(9):2014-2020. |
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| 作者姓名： | 康四军 杨金辉 杨斌 谢水波 王劲松 黎传书 |
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| 作者单位： | 南华大学土木工程学院;南华大学核三力技术有限公司 |
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| 基金项目： | 国家自然科学基金项目（21177053） |
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| 摘 要： | 为探究改性烟末生物质吸附剂对水中NO_3~-的吸附机理,以烟末为原料,通过吡啶催化法改性制备改性烟末生物质吸附剂(Modified Tobacco Powder Biomass Adsorbents,MTPBA),吸附水中的NO_3~-。根据X-射线衍射(XRD)、扫描电子显微镜(SEM)、能谱分析(EDS)和傅里叶变换红外光谱(FTIR)对MTPBA的表征分析,结果显示:烟末改性后,表面Zeta电位、孔隙结构和纤维素上官能团的变化有利于吸附NO_3~-。采用静态吸附实验方法,研究MTPBA对水中NO_3~-的吸附特性,结果表明:当NO_3~-初始浓度为30 mg·L~(-1),MTPBA投加量为4.0 g·L~(-1),溶液p H=6.68,吸附时间为30 min时,MTPBA对水中NO_3~-吸附效果最佳。吸附过程与准二级动力学模型(R20.99)、Langmuir和Freundlich等温模型(R20.92)能较好地拟合,Langmuir拟合结果表明:MTPBA对水中NO_3~-有较高的吸附容量(Qmax=28.458 mg·g~(-1)),优于改性蒙脱石和生物炭。研究表明:MTPBA具有较高的吸附容量,优于改性蒙脱石和生物炭,其对NO_3~-的吸附机理以与叔胺基团的静电及离子交换吸附为主,多孔结构材料的物理吸附并存。
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| 关 键 词： | 改性烟末生物质吸附剂 NO3- 吸附特性 吸附机理 |
| 收稿时间： | 2018/1/5 0:00:00 |
Adsorption characteristics and mechanism of modified tobacco powder biomass adsorbent for NO3- in water |
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| KANG Si-jun,YANG Jin-hui,YANG Bin,XIE Shui-bo,WANG Jin-song and LI Chuan-shu.Adsorption characteristics and mechanism of modified tobacco powder biomass adsorbent for NO3- in water[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2018,37(9):2014-2020. |
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| Authors: | KANG Si-jun YANG Jin-hui YANG Bin XIE Shui-bo WANG Jin-song and LI Chuan-shu |
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| Institution: | School of Civil Engineering, University of South China, Hengyang 421001, China,School of Civil Engineering, University of South China, Hengyang 421001, China,Nuclear Sanli Technology Co., Ltd., University of South China, Hengyang 421001, China,School of Civil Engineering, University of South China, Hengyang 421001, China,School of Civil Engineering, University of South China, Hengyang 421001, China and School of Civil Engineering, University of South China, Hengyang 421001, China |
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| Abstract: | To explore the mechanism of adsorption of NO3- by modified tobacco powder biomass adsorbent (MTPBA) in water, scrap tobacco (tobacco powder) was used as the raw material to obtain MTPBA with the pyridine-catalyzed method. The characterization of MTPBA by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FTIR) were used to investigate the mechanism of MTPBA adsorption. The static adsorption test method was used to explore the characteristics of NO3- adsorption by MTPBA. The results showed the adsorption effect of NO3- in water was greatest when the initial concentration of NO3- was 30 mg·L-1, the dosage of MTPBA was 4.0 g·L-1, the pH value was 6.68, and the adsorption time was 30 min. The adsorption process is well fitted to the pseudo-second order kinetic model (R2>0.99). The experimental data fit well with the Langmuir and Freundlich isothermal models (R2>0.92). The Langmuir fitting results show that MTPBA had a higher adsorption capacity for NO3- in water (Qmax=28.458 mg·g-1) than that of modified montmorillonite and biochar; this indicates that MTPBA has better adsorption properties than that of modified montmorillonite and biochar. The adsorption mechanism of NO3- is mainly based on electrostatic and ion exchange adsorption with tertiary amine groups,and the physical adsorption of porous structural materials. |
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| Keywords: | modified tobacco powder biomass adsorbent NO3- adsorption characteristics adsorption mechanism |
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