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| Preparation of modified palm fiber biochars and their adsorption of Pb2+ in solution |
| Received:October 29, 2020 |
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| KeyWord:palm fiber;biochar;load modification;adsorption;Pb2+ |
| Author Name | Affiliation | E-mail | | WEN Jia-wei | School of Chemical Engineering and Pharmacy, Henan University of Science and Technology, Luoyang 471023, China | | | WANG Hui | School of Chemical Engineering and Pharmacy, Henan University of Science and Technology, Luoyang 471023, China | wanghui_peony@163.com | | ZHANG Hao | School of Chemical Engineering and Pharmacy, Henan University of Science and Technology, Luoyang 471023, China | | | JIANG Jun | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| In order to improve the heavy metal adsorption performance of biochars, we prepared palm fiber biochar(NPB), KOH-activated orthogonal optimized biochar(PB), and loaded modified nano silica biochar(PBS) from palm fiber as a raw material. The prepared biochars were characterized by infrared spectroscopy and scanning electron microscopy, and iodine adsorption values and Pb2+ adsorption properties in water were compared. We also analyzed adsorption kinetics and isothermal adsorption characteristics. The results showed that compared with NPB, PB and PBS had a significantly larger number of surface adsorption sites and significantly higher specific surface area, total pore volume, and maximum adsorption capacity. The Pb2+ adsorption process of PB corresponded to a quasi-second-order kinetic model, whereas that of PBS was in line with a quasi-first-order kinetic model. The maximum Pb2+ adsorption capacities of PB and PBS were 110.89 mg·g-1 and 151.63 mg·g-1, respectively. Furthermore, a comparison of the parameters of Langmuir and Freundlich model fitting equations indicated that the adsorption process of Pb and PBS on Pb2+ is homogeneous, with single and double layers simultaneously, which is more consistent with the Langmuir equation. The findings of this study indicate that PBS has the best Pb2+ adsorption performance among the assessed biochars, which is 1.37 times higher than that PB, and has a significant load modification effect. Accordingly, the PBS biochar would have good application potential. |
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