Abstract

Au–Pd NPs@CNSs/GO nanocomposites have been fabricated by the in situ growth of Au–Pd nanoparticles on carbon nanospheres (CNSs) using ascorbic acid as reducing agent and diethylenetriamine (DETA) as a coupling linker and the subsequent assembly of the Au–Pd NPs@CNSs on graphene oxide (GO). In the nanocomposites, the Au–Pd NPs alloys have an average particle diameter of less than 10 nm. The nanocomposites show excellent catalytic activity for methylene blue with a high degradation efficiency above 99% in the presence of NaBH₄ in aqueous solution, which is attributed to the effects of Au–Pd NPs alloys in the nanocomposites. In addition, the catalyst exhibits good selectivity for methylene blue in the presence of other organic dyes. Meanwhile, the catalytic activity remains unchanged for nine cycles. Such features ensure a very promising application of nanocomposites in the selective degradation of methylene blue in dyes mixtures.

中文翻译：

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Au-Pd NPs @ CNSs / GO纳米复合材料的制备及其高催化性能

摘要

Au-Pd NPs @ CNSs / GO纳米复合材料是通过使用抗坏血酸作为还原剂和二亚乙基三胺（DETA）作为偶联连接剂并随后组装Au而在碳纳米球（CNSs）上原位生长Au-Pd纳米颗粒而制成的–氧化石墨烯（GO）上的Pd NPs @ CNSs。在纳米复合材料中，Au-Pd NPs合金的平均粒径小于10 nm。在NaBH ₄存在下，纳米复合材料对亚甲基蓝显示出优异的催化活性，并具有高于99％的高降解效率在水溶液中，这归因于Au-Pd NPs合金在纳米复合材料中的作用。另外，在其他有机染料的存在下，催化剂对亚甲蓝具有良好的选择性。同时，催化活性在九个循环中保持不变。这些特征确保了纳米复合材料在染料混合物中亚甲基蓝的选择性降解中非常有前途的应用。