Yazhou Qin,Jiahao Teng,Han Zhang,Fan Li,Yingsheng He
Hollow flower-like multi-metallic nanocrystals have attracted significant research attention due to their exceptional catalytic properties, which stem from their high surface area-to-volume ratio and abundant active sites. Nevertheless, conventional synthesis methods for noble metal nanocrystals typically involve complex procedures or require harsh reaction conditions. In this work, we developed a facile and environmentally benign strategy for fabricating hollow flower-shaped trimetallic nanocrystals at ambient temperature. Our approach employs AgCl nanocubes, derived from AgNO3and HAuCl4, as self-sacrificing templates. Through ascorbic acid-mediated reduction of metal precursors, we successfully synthesized three distinct types of hollow flower-like nanocrystals: AuAgCu, AuAgPt, and AuAgPd. Comprehensive characterization confirmed the well-defined morphology and precise composition control of the as-prepared nanocrystals. The catalytic performance was systematically evaluated through in situ UV–vis spectroscopy monitoring of 4-nitrophenylthiophenol reduction, revealing the following activity trend: AuAgCu > AuAgPt > AuAgPd. This study not only provides a versatile platform for constructing sophisticated multi-metallic nanostructures but also offers valuable insights into the structure–activity relationship of complex catalysts.
Heavy metal contamination in water bodies poses a severe threat to ecosystems and human health, thereby necessitating the development of rapid and highly sensitive detection methods. Traditional laboratory detection techniques are limited in their widespread application due to expensive equipment and complex operational procedures. To address this issue, we developed a rapid detection technique based on AuAgPd trimetallic nanoparticles(TNPs)-modified filter paper combined with laser-induced breakdown spectroscopy (LIBS) for the determination of total chromium (Cr) in water. AuAgPdTNPs-modified filter paper efficiently enriches Cr of different valence states, while LIBS quantifies total Cr from its characteristic emission lines. Experimental results demonstrate that the limit of detection (LOD) of total Cr is 0.21 μg/L (4 nM), showing good linearity in the ranges of 0–50 μg/L and 50–1000 μg/L. In tests with actual water samples, the method showed high reliability, with recovery rates ranging from 95.24 % to 106.15 %. This technology provides a novel solution for the rapid detection of heavy metal pollution in water bodies and holds broad application prospects.
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