Previously, we invented and investigated membrane-free electrodeionization (MFEDI), a novel deionization technique that uses ion exchange resins as the critical material, for the production of high-purity water. However, the functional materials used in MFEDI are common resins that cannot simultaneously achieve effective adsorption, easy electrical regeneration, and good conductivity. For instance, strong acid resin, a cation exchange resin commonly used in MFEDI, cannot be easily electrically regenerated; weak acid resin can be easily regenerated, but has poor conductivity and adsorption properties. There are currently no available resins that can meet all of the requirements of conductivity, adsorption and regeneration properties. In this study, a novel amphoteric resin was prepared and characterised. This amphoteric resin contained much more cationic functional groups than anionic functional groups, behaving as a medium-strength acid resin due to the introduction of anionic functional groups. The prepared amphoteric resin exhibited better purification property than weak acid resin, and could be electrically regenerated more easily than strong acid resin. When the amphoteric resin was coupled with strong base resin and the conductivity of the purified water was kept below 0.10 µs/cm, the water recovery and energy consumption were 74.60% and 0.84 kWh/m³ water, respectively. By contrast, the energy consumption and water recovery were 40.74% and 2.65 kWh/m³ water for strong acid resin, and 64.44% and 1.53 kWh/m³ water for weak acid resin under similar conditions. Clearly, the developed amphoteric resin significantly improves the MFEDI properties.

以前，我们发明并研究了无膜电去离子（MFEDI），这是一种使用离子交换树脂作为关键材料的新型去离子技术，用于生产高纯水。但是，MFEDI中使用的功能材料是常见的树脂，无法同时实现有效的吸附，易于电再生和良好的导电性。例如，强酸树脂，即MFEDI中常用的阳离子交换树脂，不容易被电再生。弱酸树脂易于再生，但导电性和吸附性能较差。当前没有可满足导电性，吸附和再生性能所有要求的树脂。在这项研究中，制备并表征了新型的两性树脂。该两性树脂比阴离子官能团包含更多的阳离子官能团，由于引入了阴离子官能团而表现为中等强度的酸性树脂。所制备的两性树脂显示出比弱酸树脂更好的纯化性能，并且比强酸树脂更容易电再生。当两性树脂与强碱性树脂结合使用时，净化水的电导率保持在0.10 µs / cm以下，则水回收率和能耗分别为74.60％和0.84 kWh / m。比强酸树脂更容易电再生。当两性树脂与强碱性树脂结合使用时，净化水的电导率保持在0.10 µs / cm以下，则水回收率和能耗分别为74.60％和0.84 kWh / m。比强酸树脂更容易电再生。当两性树脂与强碱性树脂结合使用时，净化水的电导率保持在0.10 µs / cm以下，则水回收率和能耗分别为74.60％和0.84 kWh / m。^3个水，分别。相比之下，在类似条件下，强酸树脂的能耗和水回收率分别为40.74％和2.65 kWh / m ³水，弱酸树脂的能耗和水回收率分别为64.44％和1.53 kWh / m ³水。显然，开发的两性树脂显着改善了MFEDI性能。