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| Adsorption characteristics and mechanism of modified tobacco powder biomass adsorbent for NO3- in water |
| Received:January 05, 2018 |
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| KeyWord:modified tobacco powder biomass adsorbent;NO3-;adsorption characteristics;adsorption mechanism |
| Author Name | Affiliation | E-mail | | KANG Si-jun | School of Civil Engineering, University of South China, Hengyang 421001, China | | | YANG Jin-hui | School of Civil Engineering, University of South China, Hengyang 421001, China | yanjinhui126@126.com | | YANG Bin | Nuclear Sanli Technology Co., Ltd., University of South China, Hengyang 421001, China | | | XIE Shui-bo | School of Civil Engineering, University of South China, Hengyang 421001, China | | | WANG Jin-song | School of Civil Engineering, University of South China, Hengyang 421001, China | | | LI Chuan-shu | 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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