NaOH介质中活性炭催化氧化性能变化规律

活性炭对NaOH钒铬提取的催化氧化效果显著，在NaOH介质中添加活性炭可显著促进钒渣中钒铬的氧化溶出，铬的溶出率由不足5%提高到85%以上。以NaOH介质中活性炭催化氧化性能变化规律为重点展开研究，结果表明，活性炭的反应强化作用与氧气溶解度无关，主要与其吸附性能及催化氧化性能相关，椰壳活性炭的反应强化效果最优，其对应的碘值、亚甲基蓝值最高，且与不同浓度NaOH溶液反应后吸附性变化不大。以椰壳活性炭为代表的含活性氧活性炭与NaOH溶液反应后，表面酸性含氧官能团大幅降低，超氧自由基含量随NaOH溶液浓度提高而显著增加，超氧自由基的生成对活性炭强化亚熔盐介质分解钒渣起到催化氧化作用。

Research on the Mechanism of Catalytic Oxidation Performance of Active Carbon in NaOH Solution

As a typical oxygen carrier, active carbon has a significant catalytic oxidation effect on the extraction of vanadium and chromium by NaOH solution. The addition of active carbon in NaOH medium can significantly promote the extraction of vanadium and chromium from vanadium slag, and the extraction rate of chromium can be increased from less than 5% to more than 85%. In this paper, the mechanism of catalytic oxidation performance of active carbon in NaOH solution was studied. The results show that the strengthening effect of active carbon has nothing to do with oxygen solubility, but mainly related to its adsorption and catalytic oxidation performance. The coconut shell active carbon with the best reaction strengthening effect has the highest iodine value and methylene blue value, and has no obvious change after reaction with different concentration of NaOH solution. After the reaction of activated oxygen containing active carbon, represented by coconut shell active carbon, with NaOH solution, the surface acidic oxygen-containing functional groups decreased significantly and the superoxide free radical content increased significantly with the increase of NaOH solution concentration. The formation of superoxide radical played a catalytic role in the decomposition of vanadium slag by active carbon in sub molten salt medium.