| 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. |
| 改性烟末生物质吸附剂对水中NO3-的吸附特性与机理 |
| Adsorption characteristics and mechanism of modified tobacco powder biomass adsorbent for NO3- in water |
| 投稿时间：2018-01-05 |
| DOI：10.11654/jaes.2018-0035 |
| 中文关键词: 改性烟末生物质吸附剂 NO3- 吸附特性 吸附机理 |
| 英文关键词: modified tobacco powder biomass adsorbent NO3- adsorption characteristics adsorption mechanism |
| 基金项目:国家自然科学基金项目（21177053） |
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| 摘要点击次数: 1915 |
| 全文下载次数: 1963 |
| 中文摘要: |
| 为探究改性烟末生物质吸附剂对水中NO3-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NO3-。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NO3-。采用静态吸附实验方法，研究MTPBA对水中NO3-的吸附特性，结果表明：当NO3-初始浓度为30 mg·L-1，MTPBA投加量为4.0 g·L-1，溶液pH=6.68，吸附时间为30 min时，MTPBA对水中NO3-吸附效果最佳。吸附过程与准二级动力学模型（R2>0.99）、Langmuir和Freundlich等温模型（R2>0.92）能较好地拟合，Langmuir拟合结果表明：MTPBA对水中NO3-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NO3-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。 |
| 英文摘要: |
| 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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