Lin Yue, Qian Qun, Chen Zhenhui, Feng Daolun, Tuan Phan Dinh, Yin Fang
Merchant Marine College, Shanghai Maritime University, Shanghai 201306, P. R. China.
College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, P. R. China.
Langmuir. 2022 Sep 20;38(37):11354-11361. doi: 10.1021/acs.langmuir.2c01645. Epub 2022 Sep 8.
The recycling of strontium ions (Sr) from sea water has been well known for its good cost-effectiveness and environment friendliness. Herein, we modified the surface of TiO nanotubes (TNTs) prepared by porous titanium anodization via hydrothermal (HT) reaction and synthesized a highly efficient adsorbent for the repeated recycling of Sr. TNTs with a high specific surface area were manufactured on porous titanium by internal anodic oxidation. The as-prepared TNTs were treated by HT method to synthesize adsorption materials with a tubular bottom and grass-type top structure loaded with Na. The surface cracks were eliminated by annealing pretreatment, and the investigation found that the 6 h HT reaction most effectively increased the Na content in the adsorbent. The as-synthesized adsorbents (HT-6TNTs) were used to recover Sr, and the maximum adsorption efficiency (approximately 100%) and adsorption equilibrium were observed within 10 h. Meanwhile, three consecutive cycles of adsorption experiments proved the uniform behavior of the HT-6TNTs in the reproducible recycling of Sr. In addition, by increasing the anodization time of TNTs from 0.5 to 3 h, the maximum adsorption capacity can be increased from 4.68 to 36.15 mg·unit, approximately 7.7 times higher.
从海水中回收锶离子（Sr）因其良好的成本效益和环境友好性而广为人知。在此，我们通过水热（HT）反应对多孔钛阳极氧化制备的TiO纳米管（TNTs）表面进行改性，合成了一种用于Sr重复回收的高效吸附剂。通过内部阳极氧化在多孔钛上制备了具有高比表面积的TNTs。将制备好的TNTs通过HT法处理，合成了底部呈管状、顶部呈草状结构且负载有Na的吸附材料。通过退火预处理消除了表面裂纹，研究发现6小时的HT反应最有效地提高了吸附剂中的Na含量。合成的吸附剂（HT - 6TNTs）用于回收Sr，在10小时内观察到最大吸附效率（约100%）和吸附平衡。同时，连续三个循环的吸附实验证明了HT - 6TNTs在Sr可重复回收中的一致行为。此外，通过将TNTs的阳极氧化时间从0.5小时增加到3小时，最大吸附容量可从4.68增加到36.15 mg·单位，提高了约7.7倍。
