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5 results for “expanded graphite”
Analysis table of optimal preparation conditions of expanded graphite
<p><span>The environmentally friendly preparation of sulfur-free expanded graphite (EG) remains a great challenge. A large amount of strong acids and strong oxidants were used in the preparation of expandable graphite, resulting in environmental pollution problems. Herein, a novel and green preparation method for sulfur-free expanded graphite (EG) has been developed. Sulfur-free EG was fabricated using natural flake graphite (NFG), sodium perchlorate (NaClO<sub>4</sub>), and oxalic acid (C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>) as raw materials. The electrochemical oxidation method was applied to prepare sulfur-free expandable graphite, and microwave irradiation technology was adopted to prepare sulfur-free EG. The optimum weight ratio was as follows: NFG:NaClO<sub>4</sub>:C<sub>2</sub>H<sub>2</sub>O<sub>4</sub> = 1.5:10:2. The anodic oxidation occurred under a constant current density of 47 mA/cm<sup>2</sup>, and the intercalation reaction lasted for 60 min at ambient temperature. The largest expanded volume (EV) of sulfur-free EG was 290 mL/g. The FTIR spectrum proved that the ClO4<sup>−</sup> and COO<sup>−</sup> groups had entered the graphite layers. The SEM images showed that the graphite layers were completely opened, and the pore structure was clearly observed. The sulfur-free EG prepared by the method does not cause environmental pollution and has broad application prospects.</span></p>
Analysis table of optimal preparation conditions of expanded graphite
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Nanoscale zero-valent iron loaded vermiform expanded graphite for the removal of Cr (VI) from aqueous solution
<p><span>Cr (VI)</span><span> is indispensable in industrial manufacturing, and its extensive use leads to severe heavy-metal pollution in the water environment around people, posing a </span><span>great</span><span> danger to physical health and living environment of multitudinous organisms. Expanded graphite (EG) is considered as a typical material for adsorption, while nanoscale zero-valent iron (nZVI) can be applied to degrade and sedimentate various organic or inorganic pollutants. In this study, a simultaneous collaboration of EG and nZVI is carried out, with the investigation on the influence of different test conditions for adsorption performances. These findings demonstrate that nZVI@EG manifests favorable adsorptive performance on the removal of hexavalent chromium efficiently. nZVI, acted as an electron donor, is supposed to reduce Cr(VI) to Cr(III), turning itself into iron oxide or hydroxide. The whole process is an exothermic reaction, accompanying chemical reduction and physical adsorption. And Cr(III) is fastened on the appearance by deposition of chromium hydroxide or ferrochromium complex precipitation, which greatly reduces the total chromium content in the aqueous solution. Herein, as a new composite adsorbent, nZVI@EG shows promising prospects of practical applications in water contamination and environmental remediation.</span></p>
Nanoscale zero-valent iron loaded vermiform expanded graphite for the removal of Cr (VI) from aqueous solution
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Highly stretchable conductors based on expanded graphite macro-confined in tubular rubber
<p>Content:<br> 1. Figure 2<br> 2. Figure 3<br> 3. Figure 4<br> 4. Figure 5<br> 5. Figure 6<br> 6. Figure 7<br> 7. Figure 8<br> Notes : This dataset is linked to Paper: ACS Applied Materials and Interfaces, DOI: 10.1021/acsami.7b08866<br> </p>
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