One-pot green synthesis of bimetallic hollow palladium-platinum nanotubes for enhanced catalytic reduction of p-nitrophenol.
One-pot green synthesis of bimetallic hollow palladium-platinum nanotubes for enhanced catalytic reduction of p-nitrophenol.
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DOI：
10.1016/j.jcis.2018.12.053
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发表时间：
2019-03
影响因子：
9.9
通讯作者：
Yinan Wang;Qingchuan Li;Ping Zhang;David O’Connor;R. Varma;Miao Yu;De-Jian Hou
中科院分区：
文献类型：
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作者：
Yinan Wang;Qingchuan Li;Ping Zhang;David O’Connor;R. Varma;Miao Yu;De-Jian Hou
双金属合金纳米结构因其在催化过程中独特的性能而受到广泛关注。然而，催化活性在整个生命周期内的下降一直是一个长期的限制，这主要归因于颗粒的聚集或解离，并且对于制造足够稳定性的双金属纳米结构仍然是一个挑战。在此，提出了一种无表面活性剂和无溶剂的绿色策略，用于制造双金属钯铂（PdPt）纳米管（NT），以脂质小管作为模板，抗坏血酸作为还原剂；随后的 NT 包含长度约 12 微米、横截面直径约 500 纳米、管壁厚度约 57 纳米的晶体管状纳米结构。当用于催化还原对硝基苯酚 (PNP) 时，与 Pt NT 相比，PdPt NT 具有改进的动力学表观速率常数 (kapp)（0.5min−1 与 0.2min−1）。此外，NTs在多个催化循环中使用时表现出高稳定性，从而为使用脂质小管作为模板制造合金NTs开辟了新的潜在途径。
Bimetallic alloy nanostructures have garnered much attention due to their unique performances in catalytic processes. However, decline in catalytic activity over the life span has been a protracted limitation, ascribed largely to the aggregation or dissociation of particles and still remains a challenge for manufacturing bimetallic nanostructures of sufficient stability. Herein, a surfactant- and solvent-free greener strategy is presented for the fabrication of bimetallic palladium-platinum (PdPt) nanotubes (NTs), deploying lipid tubules as template and ascorbic acid as a reducing agent; the ensuing NTs comprise crystalline tubal nanostructures of ∼12 μm length, ∼500 nm cross-sectional diameter, and ∼57 nm tube wall thickness. When used for the catalytic reduction ofp-nitrophenol (PNP), the PdPt NTs delivered improved kinetic apparent rate constants (kapp) compared to Pt NTs (0.5 min−1vs.0.2 min−1). Moreover, the NTs demonstrated high stability when used over multiple catalytic cycles thus opening up new potential routes for the fabrication of alloy NTs using lipid tubules as templates.