Xi'an University of Architecture and Technology, Key Lab of Gold and Resource of Shaanxi Province, Xi'an, People's Republic of China.
Shaanxi Yanchang Petroleum Hydrocarbon High-efficiency Utilization Technology Research Center, Xi'an, People's Republic of China.
Environ Technol. 2021 Apr;42(11):1693-1702. doi: 10.1080/09593330.2019.1677783. Epub 2019 Oct 30.
Dynamic three-dimensional electrode system treatment of cyanide wastewater used coal-based electrodes as cathode and anode, activated carbon as particle electrodes, the effects of applied voltage, reaction time and flow rate on ion removal rate were studied. SEM-EDS and XPS were used to study the morphology of coal-based electrode and the composition and existing state of the load substances, and the reaction mechanism were analysed and discussed. The results show that the removal rates of CN, Cu, Zn, CN, SCN in cyanide wastewater were 97.03%, 95.79%, 99.82%, 99.42% and 94.19%, respectively, when the applied voltage of 4 V, the electrode distance of 10 mm, the flow rate of 30 ml/min, the reaction time of 2.5 h and the dosage of activated carbon particles of 2 g. The applied voltage is the key factor affecting ion removal. When the voltage was 2 V, the ion removal is mainly due to the synergistic effect of chemisorption and electrosorption. The CN, SCN, and metal cyanide complex anions in wastewater migrate to the anode of coal-based anode and particle electrode rapidly under the combined action of electric field and magnetic stirring. On the surface of porous coal-based electrode, the removal of CN, SCN was mainly attributed to the oxidation of oxygen evolution from the anode reaction, while the removal of Cu, Zn and other metal ions was mainly by the electrodeposition process on the cathode surface.
采用煤基电极作为阴极和阳极，活性炭作为颗粒电极，研究了外加电压、反应时间和流速对离子去除率的影响。通过 SEM-EDS 和 XPS 研究了煤基电极的形态以及负载物质的组成和存在状态，并对反应机理进行了分析和讨论。结果表明，当外加电压为 4 V、电极间距为 10 mm、流速为 30 ml/min、反应时间为 2.5 h、活性炭颗粒用量为 2 g 时，氰化废水中的 CN、Cu、Zn、CN、SCN 的去除率分别为 97.03%、95.79%、99.82%、99.42%和 94.19%。外加电压是影响离子去除的关键因素。当电压为 2 V 时，离子去除主要是化学吸附和电吸附的协同作用。在电场和磁场搅拌的共同作用下，废水中的 CN、SCN 和金属氰化物络合阴离子迅速迁移到煤基阳极和颗粒电极的阳极。在多孔煤基电极表面，CN、SCN 的去除主要归因于阳极反应中氧气析出的氧化作用，而 Cu、Zn 等金属离子的去除主要是通过阴极表面的电沉积过程。
