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采用双室微生物燃料电池(MFC)反应器,考察了不同Cr(Ⅵ)/Cu(Ⅱ)浓度配比和外电阻条件下添加Cu(Ⅱ)对MFC阴极去铬的影响.结果表明,MFC阴极处理Cr(Ⅵ)废水时,添加一定浓度的Cu(Ⅱ)废水能提高MFC阴极去铬的效率,且添加Cu(Ⅱ)的浓度越高,提高的效果越明显.在所设置外电阻(10、500、1 000、2 000Ω)条件下,随着外电阻的降低,Cu(Ⅱ)对MFC阴极去铬的强化作用越明显.最终在Cr(Ⅵ)/Cu(Ⅱ)质量浓度配比1∶4,外电阻10Ω时,MFC阴极Cr(Ⅵ)的去除率达91.00%,较单独去铬时(39.13%)提高了132.57%.对反应后的电极进行扫描电镜附加能谱分析及X射线光电子能谱分析表明,Cr(Ⅵ)在阴极的还原产物为不导电Cr_2O_3,其附着于电极表面引起电极导电性能下降,而添加Cu(Ⅱ)后其在阴极还原为Cu和Cu_2O,该产物则在一定程度上提高了电极导电性能,缓解Cr_2O_3沉积造成的阴极钝化,从而强化了MFC阴极去铬的效率.
The effect of adding Cu (Ⅱ) on the removal of chromium in MFC cathode was investigated by using a dual-chamber MFC reactor. The results showed that MFC cathode When Cr (¢ ö) wastewater is treated, adding Cu (¢ ò) wastewater at a certain concentration can improve the efficiency of removing chromium from MFC cathode, and the higher the concentration of Cu (¢ ò) , 500,1 000,2 000 Ω), the more obvious the effect of Cu (Ⅱ) on the removal of chromium from the MFC cathode with the decrease of the external resistance.Finally, when the Cr (Ⅵ) / Cu (Ⅱ) : 4, the external resistance of 10Ω, MFC cathode Cr (Ⅵ) removal rate of 91.00%, compared with chromium alone (39.13%) increased 132.57%. After the reaction of the electrode scanning electron microscopy additional energy spectrum analysis and X-ray The results of photoelectron spectroscopy showed that the reduction product of Cr (Ⅵ) at the cathode was non-conductive Cr_2O_3, which decreased the conductivity of the electrode when attached to the surface of the electrode. However, Cu (Ⅱ) To a certain extent, improve the conductivity of the electrode and alleviate the cathode passivation caused by the deposition of Cr 2 O 3, thereby enhancing the efficiency of removing chromium from the MFC cathode.