Atian Xie,Jiuyun Cui,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai
To better circumvent the issues of oil spills and industrial organic pollutants, it is urgent and necessary to develop advanced material or technology that can efficiently separate oil/water mixture. Herein, no matter light or heavy oil/water mixtures are separated successfully by a straight tee system combining two opposite superwetting meshes. The combined system shows a high flux (above 0.22 × 10 5 L m −2 h −1 ), high efficiency (above 99.3%) for continuous light or heavy oil/water separation with good durability. Importantly, the superhydrophilic and superhydrophobic meshes can be easily obtained via facile, viable electroless galvanic replacement reaction followed post surface modification strategy. Additionally, the capillary action was used to clarify mechanism of oil/water separation to gain insight into oil/water separation process. The merits of high flux, high efficiency, viable for light/heavy oil and durability make this separation system a powerful tool for practical application in continuous oil/water separation.
In the present study, glutathione-capped gold nanoclusters (AuNCs@GSH) were prepared by an improved hydrothermal method , which showed near-infrared (NIR) emission centered at 805 nm. Besides, Ag + can induce the NIR emission transformations in a two-stage mode under different concentration ranges of Ag + . At the first stage (0.50–15 μM), a new emission at 615 nm was generated while the original NIR emission was quenched upon Ag + addition; at the second stage (15–120 μM), it shifted to 720 nm gradually along with more Ag + addition, which realized precise regulation of the emission range of metal nanoclusters from red to NIR region. The in-depth mechanism investigation revealed the transformations in both stages originated from the anti-galvanic reaction (AGR) of AuNCs toward Ag + and Ag deposition. In detail, the first stage was attributed to the formation of bimetallic gold and silver nanoclusters (Au-AgNCs); while the second stage ascribed to the Ag deposition-induced size growth and composition changes of Au-AgNCs. Therefore, the present study supplies a simple and rapid method for preparing NIR-emitted AuNCs and provides a facile approach to regulate the photoluminescence ranges based on the AGR and Ag deposition.
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