电吸附处理氰化废水过程中外加电压的影响研究

发布时间：2018-02-04 12:51

  本文关键词： 氰化废水 煤基电吸附材料 电吸附 电压　出处：《稀有金属》2017年08期 　论文类型：期刊论文

【摘要】：以自制的煤基电极材料为阴阳极,采用电吸附技术处理氰化废水,主要研究了外加电压对电吸附处理氰化提金废水的影响,测定了煤基电极材料的循环伏安曲线,并用扫描电子显微镜(SEM)、能谱分析(EDS)对吸附后的电极片进行分析表征。研究表明,外加电压对电吸附过程的影响显著,外加电压越大,离子的去除率越大。开路状态下仅发生离子的吸附现象,反应5 h后铜离子和总氰的去除率为14.60%,10.50%;当外加电压为0.4 V时,各离子在电场作用下发生定向迁移,富集于电极的双电层上,该过程主要发生离子的定向迁移及电吸附现象,各离子吸附顺序依次为Cu(CN)3-4,Zn(CN)2-4,Cu(CN)2-3,CN-,SCN-,5 h后铜离子和总氰的去除率为19.93%,22.53%;当外加电压2.0 V时,溶液中离子在定向迁移、电吸附与富集沉淀的共同作用下,5 h后铜离子及总氰的去除率可达到88.49%,75.17%,在此过程中阳极附近产生硫氰酸铜等絮状沉淀物。
[Abstract]:The electroadsorption technology was used to treat cyanide wastewater with self-made coal-based electrode material as cathode and anode. The effect of applied voltage on electroadsorption treatment of cyanide wastewater was studied. The cyclic voltammetry curves of coal-based electrode materials were measured. The adsorbed electrodes were characterized by scanning electron microscopy (SEM) and energy spectrum analysis (EDS). The effect of applied voltage on the electrosorption process is significant. The larger the applied voltage, the greater the ion removal rate. After 5 h reaction, the removal rate of copper ion and total cyanide was 14.60% and 10.50%. When the applied voltage is 0.4 V, the ions migrate in the direction under the action of the electric field, which is enriched on the double layer of the electrode. This process mainly occurs the directional migration of ions and the phenomenon of electrosorption. The order of ion adsorption is CuCCNN (3-4) ZnN (CZN) 2-4CU (CU) 2-3 (CN-N-) and SCN- (鈪，

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