硝酸改性对煤基电极材料结构及吸附性能的影响

发布时间：2018-07-03 09:17

本文选题：煤基电极材料 + 硝酸活化　；参考：《煤炭科学技术》2017年03期

【摘要】：为了提高煤基电极材料的吸附性能,采用不同浓度的硝酸对其进行改性处理,研究了煤基电极材料孔结构、电化学性能及电吸附处理氰化废水的变化规律。采用低温(77 K)N2吸附法、循环伏安测试等手段对煤基电极材料的孔径分布及电化学性能进行了分析表征。结果表明,随着硝酸浓度的增大,煤基电极材料的比表面积、总孔容和微孔率均呈现先增大后减小的趋势,而其质量比电容逐渐增大,交流阻抗逐渐减小。质量分数为40%的硝酸活化后的煤基电极材料具有发达的孔隙结构,比表面积达325 m~2/g,平均孔径为1.899 nm~,总孔容达0.162 cm~3/g,作为电极材料时其质量比电容为120.576 F/g。以硝酸活化后的煤基电极材料为阴阳极,采用电吸附技术处理氰化废水,溶液中各离子的去除率随硝酸浓度的增大而增加,硝酸质量分数为40%时废水处理效果最好。
[Abstract]:In order to improve the adsorption properties of coal-based electrode materials, different concentrations of nitric acid were used to modify them. The pore structure, electrochemical performance and electroadsorption of coal based electrode materials for cyanide wastewater treatment were studied. The pore size distribution and electrochemical properties of coal based electrode materials were characterized by low temperature (77 K) N2 adsorption and cyclic voltammetry. The results show that with the increase of nitric acid concentration, the specific surface area, total pore volume and micropore ratio of coal-based electrode materials increase first and then decrease, while the mass specific capacitance increases and the AC impedance decreases gradually. The activated coal-based electrode material with 40% mass fraction of nitric acid has developed pore structure, with a specific surface area of 325mg / g, an average pore size of 1.899 nm / g, and a total pore volume of 0.162 cm / m ~ (3 / g). The specific mass capacitance of the electrode is 120.576 F / g. The removal rate of each ion in cyanide wastewater was increased with the increase of nitric acid concentration, and the best treatment effect was obtained when the mass fraction of nitric acid was 40, taking the coal-based electrode material activated by nitric acid as anode and anode, and the electroadsorption technology was used to treat cyanide wastewater.
【作者单位】：西安建筑科技大学陕西省黄金与资源重点实验室;
【基金】：国家自然科学基金青年基金资助项目(51504180) 金川公司-西安建筑科技大学预研基金资助项目(YY1403) 陕西省黄金与资源重点实验室统筹资助项目(2015S8SJ-54)
【分类号】：O646.54

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