KOH添加量对煤基电极材料结构与性能的影响

发布时间：2018-02-26 18:27

本文关键词： KOH 煤基电极材料改性氰化废水吸附性能　出处：《煤炭转化》2017年06期 　论文类型：期刊论文

【摘要】：采用KOH-HNO_3联合法对自制煤基电极进行改性处理,主要研究了KOH添加量对煤基电极材料结构和吸附性能的影响.采用扫描电子显微镜(SEM)、傅立叶红外光谱(FTIR)和N_2吸附法对煤基电极的形貌特征、表面官能团及孔径分布进行分析表征.研究表明:随着KOH添加量的增加,煤基电极材料的碘吸附值逐渐增大,而抗压强度与收率则逐渐减小,比表面积、总孔容和微孔孔容逐渐增大.当KOH添加量为15%(质量分数)时,碘吸附值达810.8mg/g,抗压强度为4.47 MPa,活化收率为59.5%,比表面积为377 m~2/g,总孔容为0.187cm~3/g,微孔孔容为0.160cm~3/g,微孔率达到85.56%.微孔和中孔数量及表面含氧官能团的增加,导致形成发达的蜂窝状孔结构,有利于电解液进入形成双电层结构.电化学测试表明,KOH添加量越大,煤基电极的扩散阻抗越小,比电容越大.以煤基电极为阴阳极,活性炭为粒子电极,采用三维电极体系处理氰化废水,当电压为4V、时间为5h时,处理后的废水中离子的去除率均达到95%以上.
[Abstract]:The self-made coal based electrode modified by KOH-HNO_3 combined method, mainly studied the effect of the amount of KOH on coal based electrode material structure and adsorption properties. Using scanning electron microscopy (SEM), Fu Liye (FTIR) IR morphology and N_2 adsorption on coal based electrode, analysis and characterization of surface functional groups and pore size distribution. The results showed that with the increased amount of KOH, the iodine adsorption of coal based electrode materials increases, while the compressive strength and yield decreased, the specific surface area, total pore volume and Kong Rong gradually increased. When the adding amount is 15% KOH (mass fraction), the iodine adsorption value of 810.8mg/g and the compressive strength is 4.47 MPa, the activation yield is 59.5%, the specific surface area is 377 m~2/g, the total pore volume is 0.187cm~3/g, pore volume of 0.160cm~3/g, 85.56%. increase rate of micro pores and pore number and surface oxygen functional groups, leading to the formation of Honeycomb structure developed, is conducive to the formation of double layer structure into the electrolyte. The electrochemical tests show that the amount of KOH increases, the diffusion impedance of coal based electrode is small, is bigger than the capacitance. The coal based activated carbon electrode as anode and cathode, as particle electrode, using three-dimensional electrode system for treating cyanide wastewater, when the voltage for 4V, time is 5h, the ion treated wastewater the removal rate reached more than 95%.

【作者单位】：西安建筑科技大学冶金工程学院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) 陕西省教育厅重点实验室科研计划项目(13JS059)
【分类号】：TB303

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