In this study, a novel asymmetric capacitive deionization (CDI) technology using D314/activated carbon (AC) and D860/AC composite electrodes as the anode and cathode electrodes, respectively, was proposed to enhance the adsorption and separation efficiency of vanadium (V) from complex V-containing solutions. The V adsorption capacity and separation factor of V to impurities (Al, Fe and P) augments with pH increasing from 1.2 to 1.8. The reduction rate of V and energy consumption decrease with increasing pH but improve with increasing voltage. The higher operational voltage can enhance the selectivity of asymmetric CDI ascribing to the greater influence of electric force on adsorbing impurities than on V adsorption. The adsorbed impurities and V can be effectively washed with 0.08 M H₂SO₄ and 3.0 M H₂SO₄, respectively. V can be enriched for near 3 times and the impurities can be effectively separated from the feed solution after 8 adsorption-desorption cycles. The adsorption and separation efficiency of the present research for V are higher than those of traditional CDI, indicating that asymmetric CDI is an effective and promising technique for the enhancement of V and other ions adsorption and separation.

在这项研究中，提出了一种新颖的不对称电容去离子（CDI）技术，该技术分别使用D314 /活性炭（AC）和D860 / AC复合电极作为阳极和阴极，以提高钒（V）的吸附和分离效率。来自复杂的含V溶液。随着pH从1.2升高到1.8，V对杂质（Al，Fe和P）的V吸附能力和分离因子增加。V的降低率和能量消耗随着pH的增加而降低，但随着电压的增加而提高。较高的工作电压可以提高非对称CDI的选择性，这是因为电力对吸附杂质的影响大于对V吸附的影响。吸附的杂质和V可以用0.08 MH ₂ SO ₄进行有效洗涤和3.0 MH ₂ SO ₄。V可以富集近3倍，并且经过8个吸附-解吸循环后，杂质可以有效地从进料溶液中分离出来。目前研究中对V的吸附和分离效率高于传统CDI，这表明不对称CDI是增强V和其他离子吸附和分离的有效且有前途的技术。