Nanofiber membranes were successfully prepared with crown ether (CE) functionalized graphene oxide (GO), chitosan (CS), and polyvinyl alcohol (PVA) by low-temperature thermally induced liquid–liquid phase separation. The physical and chemical properties and adsorption performance of nanofiber membrane were studied through SEM, FT-IR, XRD, and static adsorption experiments. The results show that the specific surface area of the nanofiber membrane is as high as 101.5 m²∙g⁻¹. The results of static adsorption experiments show that the maximum adsorption capacity of the nanofiber membrane can reach 168.50 mg∙g⁻¹ when the pH is 7.0. In the selective adsorption experiment, the nanofiber membrane showed high selectivity for Li⁺ in salt lake brine. After five cycles, the material still retains 88.31% of the adsorption capacity. Therefore, it is proved that the material has good regeneration ability.

In recent years, with the development of batteries, ceramics, glass and other industries, the demand for lithium has increased rapidly. Due to the rich lithium resources in seawater and salt-lake brine, the question of how to selectively adsorb and separate lithium ions from such brine has attracted the attention and research of many scholars. The Li-ion sieve stands out from other methods thanks to its excellent special adsorption and separation performance. In this paper, mesoporous titanium dioxide and lithium hydroxide were prepared by hydrothermal reaction using bacterial cellulose as a biological template. After calcination at 600 °C, spinel lithium titanium oxide Li₂TiO₃ was formed. The precursor was eluted with HCl eluent to obtain H₂TiO₃. The lithium titanate were characterized by IR, SEM and X-ray diffraction. The adsorption properties of H₂TiO₃ were studied by adsorption pH, adsorption kinetics, adsorption isotherm and competitive adsorption. The results show that H₂TiO₃ has a single-layer chemical adsorption process, and has a good adsorption effect on lithium ions at pH 11.0, with a maximum adsorption capacity of 35.45 mg g⁻¹. The lithium-ion sieve can selectively adsorb Li⁺, and its partition coefficient is 2242.548 mL g⁻¹. It can be predicted that the lithium-ion sieve prepared by biological template will have broad application prospects.

A tertiary-amine-decorated CMP photocatalyst was fabricated for high-performance H ₂ O ₂ production, enabled by the synergistic effects of a proton sponge and proton reservoir.

The separation and recovery of neodymium from industrial pollutants and environmental sewage has become a problem of concern. However, there are still several difficulties in the practical treatment process including low pH values, low concentrations of rare earth elements, and coexistence of multiple trivalent ions, which are long-term challenges for neodymium recovery. In this paper, the synthesis of a composite membrane prepared using chitosan as an efficient adsorbent for Nd³⁺ is reported. The introduction of polyethylenimine into the composite membrane provided abundant protonated amino nitrogen atoms and endowed the composite membrane with excellent buffering capacity under extremely acidic conditions. Carbon nanofiber aerogels in the composite membrane can effectively improve the specific surface area and mechanical properties. Moreover, the introduction of ion imprinting technology can effectively improve the specific adsorption of Nd³⁺ on the composite membrane, which makes the composite membrane able to easily separate Nd³⁺ from other coexisting ions. The adsorption capacity of single metal adsorption for Nd³⁺ is 43.63 mg g⁻¹. The composite membrane also showed good reusability, and the regeneration efficiency reached 86% after 5 cycles. The results show that the composite membrane can be used for the separation and enrichment of Nd³⁺ in solution.