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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。
Using self-made coal-based electrode materials as the anode and cathode, the electrocatalytic treatment of cyanidation wastewater was carried out. The influence of applied voltage on the electrocatalytic treatment of cyanide-leaching wastewater was studied. The cyclic voltammetry curves of the coal-based electrode materials were determined. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to characterize the adsorbed electrode. Studies have shown that the impact of applied voltage on the adsorption process is significant, the greater the applied voltage, the greater the ion removal rate. Under the open state, only the adsorption of ions occurred. After 5 h reaction, the removal rates of copper ions and total cyanogens were 14.60% and 10.50%, respectively. When the applied voltage was 0.4 V, the ions migrated in the direction of the electric field and enriched in The ion-oriented migration and electrosorption phenomenon mainly occurred in the electrical double layer of the electrode. The order of the ion adsorption was Cu (CN) 3-4, Zn (CN) 2-4, Cu (CN) CN- and SCN-. After 5 h, the removal rates of copper ions and cyanide were 19.93% and 22.53%, respectively. Under the applied voltage of 2.0 V, h, the removal rate of copper ions and total cyanide can reach 88.49% and 75.17% respectively. During the process, flocculent precipitate such as copper thiocyanate is generated near the anode.