Conventional emulsion hydrogel adsorbents for recovering metal ions from water were commonly limited by their extractant leakage and relatively low encapsulation efficiency. In this work, dual 3-D networked Pickering emulsion hydrogels (PEHGs) encapsulating copper ion extractant N902 were prepared by polymerizing an oil-in-water Pickering emulsion. The PEHGs were characterized by SEM, TGA and compressing tests. Static and fixed-bed experiments of the PEHGs for the adsorption of Cu²⁺ were carried out. The results showed that the encapsulation efficiency of extractants reached 99% and the leakage of extractants was negligible owing to the 3-D hydrogel networks and the 3-D silica nanoparticle networks in PEHGs. The critical crashing pressure of PEHGs (oil fraction was 40% v/v) was 30.08 kPa with a deformation ratio of 0.7. The saturated extraction capacity of the extractants in PEHGs was higher than that of bare extractants. The adsorption capacity of Cu²⁺ on fixed-bed (10.12 mg g^-1) was consistent with the predicted value of Langmuir isotherm model. After 65 cycles, the amount of Cu²⁺ adsorbed onto PEHGs maintained 97.5% of the initial one without extractant leakage and mass loss. Due to the well protection of extractants, this adsorbent encapsulating extractants presented a promising potential application for water treatment.

用于从水中回收金属离子的常规乳液水凝胶吸附剂通常受到其萃取剂泄漏和相对较低的包封效率的限制。在这项工作中，通过聚合水包油Pickering乳液制备了包封铜离子萃取剂N902的双3-D网络Pickering乳液水凝胶（PEHG）。通过SEM，TGA和压缩测试对PEHG进行了表征。PEHGs吸附Cu ^2+的静态和固定床实验被执行。结果表明，由于PEHGs中的3-D水凝胶网络和3-D二氧化硅纳米粒子网络，萃取剂的包封率达到了99％，萃取剂的泄漏可忽略不计。PEHGs（油含量为40％v / v）的临界崩溃压力为30.08 kPa，变形率为0.7。PEHGs中萃取剂的饱和萃取能力高于裸萃取剂。固定床（10.12 mg g ^-1）对Cu ²⁺的吸附能力与Langmuir等温线模型的预测值一致。65次循环后，Cu ^2+的含量  吸附在PEHG上的吸附保持了最初吸附的97.5％，而没有萃取剂泄漏和质量损失。由于萃取剂的良好保护，这种包裹萃取剂的吸附剂在水处理方面具有广阔的应用前景。