无硫可膨胀石墨的制备及特征

发布时间：2018-02-21 03:38

  本文关键词： 可膨胀石墨 插层剂 化学氧化法 微孔特征　出处：《现代化工》2017年04期 　论文类型：期刊论文

【摘要】：以内蒙古固定碳质量分数为98.86%的天然鳞片石墨为原料,高锰酸钾、硝酸与高氯酸的混酸为氧化插层剂,采用化学氧化法直接插层制备可膨胀石墨。探究混酸配比(质量比)及用量、高锰酸钾质量分数、反应温度、反应时间等因素对可膨胀石墨膨化效果的影响。最佳制备工艺条件为:m(石墨)∶m(高锰酸钾)∶m(混酸)为1∶0.10∶4.5,混酸中硝酸的质量分数为8%,反应温度为40℃,反应时间为45 min,此条件下制得的可膨胀石墨的膨胀容积为410 m L/g。各阶段产物的XRD、FTIR、SEM分析表明,插层后碳层边缘呈现卷曲、张裂和剥离,层间距增大,膨胀后形成独特的"微胞"蠕虫状、贯通柳叶状、不规则多边形的三级孔隙结构。
[Abstract]:Natural flake graphite with fixed carbon content of 98.86% in Inner Mongolia was used as raw material, potassium permanganate, mixed acid of nitric acid and perchloric acid as oxidation intercalation agent. The expandable graphite was prepared by direct intercalation by chemical oxidation. The ratio and dosage of mixed acid, the mass fraction of potassium permanganate and the reaction temperature were investigated. The effect of reaction time on the expansion effect of expandable graphite was studied. The optimum preparation conditions were as follows: 1: 0.10: 4.5. the mass fraction of nitric acid in the mixed acid was 8 and the reaction temperature was 40 鈩，

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