Recycling methods will be essential for the future circular economy in the context of declining natural resources. Nanomaterials are promising adsorbents to recover rare earth elements from wastewater, yet the practical application of nanomaterials is limited by spontaneous agglomeration, easy collapse of structures and the difficulty in collecting nanomaterials after adsorption. To solve these issues, we prepared a polyurethane sponge-supported titanium phosphate with graphene oxide, abbreviated as GO@TiP-Sponge, by in situ precipitation. GO@TiP-Sponge was characterized by X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy, and tested for the removal and recovery of trace dysprosium Dy(III), a rare-earth element, in water using batch experiments. Results show that the GO@TiP-Sponge showed an excellent affinity for dysprosium with theoretical capacity reaching 576.17 mg/g according to the Langmuir model. Half-equilibrium was reached in 2.5 min according to a pseudo-second-order model. GO@TiP-Sponge also displayed an adsorption ability for a wide range of pH and salinity. Such performance is explained by strong binding of phosphate with Dy(III), enhanced surface area induced by graphene oxide and less aggregation from the spongy structure. The main adsorption mechanism involves electrostatic interaction.

在自然资源减少的背景下，回收方法对于未来的循环经济至关重要。纳米材料是从废水中回收稀土元素的有前途的吸附剂，但是纳米材料的实际应用受到自发的团聚，结构易塌陷以及吸附后难以收集纳米材料的限制。为了解决这些问题，我们通过原位沉淀法制备了聚氨酯海绵支撑的磷酸钛与氧化石墨烯（简称GO @ TiP-Sponge）。GO @ TiP-Sponge的特征在于X射线衍射，扫描电子显微镜，能量色散X射线光谱和X射线光电子能谱，并测试了稀土and（Dy（III））的去除和回收率。元素，在水中使用分批实验。结果表明，根据Langmuir模型，GO @ TiP-海绵对具有极好的亲和力，理论容量达到576.17 mg / g。根据伪二阶模型，在2.5分钟内达到了半平衡。GO @ TiP-Sponge还显示了对各种pH和盐度的吸附能力。磷酸盐与Dy（III）的牢固结合，氧化石墨烯引起的表面积增加以及海绵结构的聚集较少，可以解释这种性能。主要的吸附机理涉及静电相互作用。GO @ TiP-Sponge还显示了对各种pH和盐度的吸附能力。磷酸盐与Dy（III）的牢固结合，氧化石墨烯引起的表面积增加以及海绵结构的聚集较少，可以解释这种性能。主要的吸附机理涉及静电相互作用。GO @ TiP-Sponge还显示了对各种pH和盐度的吸附能力。磷酸盐与Dy（III）的牢固结合，氧化石墨烯引起的表面积增加以及海绵结构的聚集较少，可以解释这种性能。主要的吸附机理涉及静电相互作用。