| [Wu Enhui,Li Jun,Hou Jing,Xu Zhong,Huang Ping,Jiang Yan,Zhang Yuan and Liu Qianshu.Preparation, Characterization of Graphite/Vanadium oxide and It’s Adsorption Properties for Methylene Blue Solution[J].Rare Metal Materials and Engineering,2023,52(1):308~317.] |
| Preparation, Characterization of Graphite/Vanadium oxide and It’s Adsorption Properties for Methylene Blue Solution |
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| Received:December 05, 2021 Revised:January 29, 2022 |
| DOI： |
| Key words: graphite vanadium oxide methylene blue adsorption |
| Foundation item:四川省科技厅项目资助(项目号19ZYCXPT；项目号：2020YFH0195)；攀枝花市科技局项目资助(项目号：2021CY-G-4) |
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| Abstract: |
| The graphite/vanadium oxide composites were prepared by a carbothermal reduction method using V2O5 as the raw material and graphite powder as the reducing agent. The Methylene blue was used as a simulated pollutant, the adsorption properties of the prepared samples in different reduction conditions were systematically evaluated, and the samples prepared at the reduction temperature of 650 ℃, reduction time of 60 min and graphite ratio of 18.03% were selected for characterization and as the target adsorbent. The microstructure and surface morphology were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, high-resolution transmission electronic microscope and BET microporous analysis. The characterization results showed that the phase of the samples consisted of graphite, VO2 and a small amount of V6O13, the vanadium oxides were dispersed on the lamellar graphite surface in the form of lumps, strips and radiations, the particle sizes of the samples ranged from a few microns to tens of microns. The BET specific surface area box pore volumes of the graphite/vanadium oxide were 6.84 m2/g and 0.02 cm3/g, respectively, and most of the pore sizes were distributed in the mesoporous and macroporous regions. The adsorption experiments results showed that the graphite/vanadium oxide had good adsorption performance on methylene blue in the pH range of 3-8, and the equilibrium adsorption amounts were above 200 mg ? g-1. The adsorption process was in accordance with the Langmuir isotherm and quasi-secondary kinetic equations. |
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