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Preparation, Characterization of Graphite/Vanadium oxide and It’s Adsorption Properties for Methylene Blue Solution

1.College of Vanadium and Titanium,Panzhihua University;2.Sichuan,China Vanadium and Titanium Resources Comprehensive Utilization Key Laboratory of Sichuan Province;3.Sichuan,China;4.Sichuan Engineering Laboratory for Solar Energy Utilization Technology Integrated

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    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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[Wu Enhui, Li Jun, Hou Jing, Xu Zhong, Huang Ping, Jiang Yan, Zhang Yuan, 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.]
DOI:10.12442/j. issn.1002-185X.20211074

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  • Received:December 05,2021
  • Revised:January 29,2022
  • Adopted:March 07,2022
  • Online: February 13,2023
  • Published: February 08,2023