The practical application of the capacitive deionization (CDI) enhanced ultrafiltration (CUF) technology is hampered due to low performance of electrodes. The current study demonstrated a novel super-aligned carbon nanotube (SACNT)/activated carbon (AC) composite electrode, which was prepared through coating AC on a cross-stacked SACNT film. The desalination capability and water purification performance of the prepared electrode were systematically investigated at different applied voltages (0.8–1.2 V) with a CDI system and a CUF system, respectively. In the CDI tests, as compared with the control AC electrode, the SACNT/AC electrode achieved an approximately 100% increase in both maximum salt adsorption capacity and average salt adsorption rate under all the applied voltage conditions, demonstrating a superior desalination capability. Meanwhile, a conspicuous increase by an average of ∼26% in charge efficiency was also achieved at all the voltages. In the CUF tests, as compared with the control run at 0 V, the treatment runs at 0.8, 1.0, and 1.2 V achieved a 2.40-fold, 2.08-fold, and 2.43-fold reduction in membrane fouling (calculated according to the final transmembrane pressure (TMP) data at the end of every purification stage), respectively. The average TMP increasing rates at 0.8, 1.0, and 1.2 V were also roughly two times smaller than that at 0 V, indicating a dramatical reduction of membrane fouling. The SACNT/AC electrode also maintained its superior desalination capability in the CUF process, resulting in an overall improved water purification efficiency.

由于电极性能低下，阻碍了电容去离子（CDI）增强超滤（CUF）技术的实际应用。当前的研究表明，通过在交叉堆叠的SACNT膜上涂覆AC可以制备新型的超取向碳纳米管（SACNT）/活性炭（AC）复合电极。使用CDI系统和CUF系统分别在不同的施加电压（0.8–1.2 V）下系统地研究了所制备电极的脱盐能力和水净化性能。在CDI测试中，与对照AC电极相比，SACNT / AC电极在所有外加电压条件下的最大盐吸附量和平均盐吸附率均提高了约100％，这表明其具有出色的脱盐能力。与此同时，在所有电压下，充电效率也平均提高了约26％。在CUF测试中，与在0 V的对照运行相比，在0.8、1.0和1.2 V的处理运行，膜污染减少了2.40倍，2.08倍和2.43倍（根据最终值计算）每个纯化阶段结束时的跨膜压力（TMP）数据）。在0.8V，1.0V和1.2V时，平均TMP的上升速率也比在0V时的平均TMP上升速率小大约两倍，这表明膜污染明显减少。SACNT / AC电极在CUF工艺中也保持了其卓越的脱盐能力，从而总体提高了水净化效率。与在0 V的对照运行相比，在0.8、1.0和1.2 V的处理运行使膜污染减少了2.40倍，2.08倍和2.43倍（根据最终跨膜压力（TMP）计算）每个纯化阶段结束时的数据）。在0.8V，1.0V和1.2V时，平均TMP的上升速率也比在0V时的平均TMP上升速率小大约两倍，这表明膜污染明显减少。SACNT / AC电极在CUF工艺中也保持了其卓越的脱盐能力，从而总体提高了水净化效率。与在0 V的对照运行相比，在0.8、1.0和1.2 V的处理运行，膜污染减少了2.40倍，2.08倍和2.43倍（根据最终跨膜压力（TMP）计算）每个纯化阶段结束时的数据）。在0.8V，1.0V和1.2V时，平均TMP的上升速率也比在0V时的平均TMP上升速率小大约两倍，这表明膜污染明显减少。SACNT / AC电极在CUF工艺中也保持了其卓越的脱盐能力，从而总体提高了水净化效率。膜结垢减少43倍（根据每个纯化阶段结束时的最终跨膜压力（TMP）数据计算）。在0.8V，1.0V和1.2V时，平均TMP的上升速率也比在0V时的平均TMP上升速率小大约两倍，这表明膜污染明显减少。SACNT / AC电极在CUF工艺中也保持了其卓越的脱盐能力，从而总体提高了水净化效率。膜结垢减少43倍（根据每个纯化阶段结束时的最终跨膜压力（TMP）数据计算）。在0.8V，1.0V和1.2V时，平均TMP的上升速率也比在0V时的平均TMP上升速率小大约两倍，这表明膜污染明显减少。SACNT / AC电极在CUF工艺中也保持了其卓越的脱盐能力，从而总体提高了水净化效率。