Shuang Wang,Shuying Li,Rui Shi,Xinyu Zou,Zhijuan Zhang,Guoyuan Fu,Lei Li,Fang Luo
A nanoscale hybrid material (V2O5–Al13) for highly efficient alcohol oxidation is synthesized through electrostatic self-assembly between oppositely charged Keggin Al13 polyoxocations and exfoliated V2O5 nanosheets. The analyses by X-ray diffraction, electron microscopy, X-ray photoelectron spectroscopy and structural consideration based on charge balance indicate that the Keggin Al13 ions could be sparsely distributed in the nanosheet galleries. The as-prepared catalyst successfully achieved high catalytic activity toward alcohols (96.8% sel.) with the oxygen molecule as an ideal oxidant under mild conditions. Also, the nanohybrid showed an outstanding adsorption capability for benzyl alcohol (773 mg g−1). In comparison to individual exfoliated V2O5 nanosheets and bulk V2O5, the V2O5–Al13 nanohybrid catalyst exhibited superior catalytic activity and selectivity under the same experimental conditions. The results highlight the outstanding functionality of the V2O5–Al13 nanohybrid as an efficient oxidation catalyst. A detailed study of its structure–activity relationship showed that the high performance of the V2O5–Al13 nanohybrid is attributed to the adsorption–catalysis synergistic effect between V2O5 and Al13.
Jiani Zhu,Lei Wang,Jin Wang,Fudi Wang,Mengtao Tian,Shuchang Zheng,Ning Shao,Lele Wang,Miaolu He
Two-dimensional (2D) membranes exhibit exceptional properties in molecular separation and transport, which reveals their potential use in various applications. However, ion sieving with 2D membranes is severely restrained due to intercalation-induced swelling. Here, we describe how to efficiently stabilize the lamellar architecture using Keggin Al13 polycations as pillars in a Ti3C2Tx membrane. More importantly, interlayer spacing can be easily adjusted with angstrom precision over a wide range (2.7–11.2 Å) to achieve selective and tunable ion sieving. A membrane with narrow d-spacing demonstrated enhanced selectivity for monovalent ions. When applied in a forward osmosis desalination process, this membrane exhibited high NaCl exclusion (99%) with a fast water flux (0.30 L m–2 h–1 bar–1). A membrane with wide d-spacing showed notable selectivity, which was dependent on the cation valence. When it was applied to acid recovery from iron-based industrial wastewater, the membrane showed good H+/Fe2+ selectivity, which makes it a promising substitute for traditional polymeric membranes. Thus, we introduce a possible route to construct 2D membranes with appropriate structures to satisfy different ion-sieving requirements in diverse environment-, resource-, and energy-related applications.
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