Hybrid capacitive deionization (HCDI) is developed based on capacitive deionization (CDI) for water treatment, which combines CDI with a battery system. Developing the high-performing battery electrode materials is a significant point for HCDI. Herein, SnO₂/CNT was fabricated according to hydrothermal method, which was denoted as SnO₂/CNT-H, after calcination, the obtained product was denoted as SnO₂/CNT-HC. The as-prepared SnO₂/CNT-HC was used in HCDI system for the first time, which demonstrated a salt adsorption capacity of 9 mg g⁻¹ and ultrafast salt adsorption rate of 2.5 mg g⁻¹ min⁻¹ at 500 mg L⁻¹ initial NaCl concentration. The SnO₂/CNT-HC electrode also had a good cyclic stability of keeping 120 % of salt adsorption capacity after 100 adsorption-desorption cycles at 1.0 V and 500 mg L⁻¹ NaCl solution. Moreover, when this system was used to study the adsorption-desorption performance for different cations (Li⁺, K⁺ and Ca²⁺) and anions (F⁻, NO₃⁻ and SO₄²⁻), the phenomenon was revealed that the cation adsorption capacity of Li⁺ > K⁺ > Ca²⁺ captured by SnO₂/CNT-HC and the anion adsorption capacity of F⁻ > NO₃⁻ > SO₄²⁻ adsorbed by activated carbon. These results show that SnO₂/CNT-HC should be one of realistic electrode materials for HCDI.

基于电容去离子（CDI）的混合电容去离子（HCDI）用于水处理，将CDI与电池系统结合在一起。开发高性能电池电极材料是HCDI的重点。此处，根据水热法制造SnO ₂ / CNT，记为SnO ₂ / CNT-H，煅烧后，将所得产物记为SnO ₂ / CNT-HC。如此制备的SnO ₂ / CNT-HC首次在HCDI系统中使用，在500 mg L下的盐吸附能力为9 mg g ^-1，超快盐吸附率为2.5 mg g ^-1  min ^{-1 -1}初始NaCl浓度。SnO ₂ / CNT-HC电极还具有良好的循环稳定性，在1.0 V和500 mg L ^-1 NaCl溶液中进行100次吸附-解吸循环后，可保持120％的盐吸附能力。此外，当该系统被用来研究对不同的阳离子（锂的吸附-解吸性能⁺，K ⁺和Ca ²⁺）和阴离子（F ^-，NO ₃ ^-和SO ₄ ^2- ），该现象被显示，该SnO ₂捕获的Li ⁺  > K ⁺  > Ca ^2+的阳离子吸附能力/ CNT-HC和F的阴离子吸附能力^-  > NO ₃ ^-  > SO ₄ ^2-吸附活性炭。这些结果表明，SnO ₂ / CNT-HC应该是用于HCDI的实际电极材料之一。