Effective immobilization of gold nanoparticles on core–shell thiol-functionalized GO coated TiO2 and their catalytic application in the reduction of 4-nitrophenol

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2015-08-05 DOI:10.1016/j.apcata.2015.05.032

Hyuntae Kang, Miran Kim, Kang Hyun Park

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引用次数: 32

Abstract

We describe the synthesis of a hybrid nanomaterial comprising a core–shell titanium glycolate-thiol-functionalized graphene composite (TG@GOS) as a support for the immobilization of gold nanoparticles. TG@GOS was synthesized via the thionation of TG@GO that involved-wrapping of titanium glycolate in graphene oxide. The interaction between gold and sulfur, mainly connected through the thiol functional group, is well known that strong covalent AuS bond (bond strength ∼40 kcal/mol) in comparison with other functional group such as hydroxyl and amine. Therefore, we propose that reduced gold ions could easily bind to thiol groups on TG@GOS and grow to nanoparticles using PVP as a surfactant. Herein, titanium glycolate was transformed to TiO₂ by hydrolysis. The catalysts (TiO₂@GOS@Au) were characterized by TEM, SEM, XRD, UV–vis spectroscopy and tested for the reduction of 4-nitrophenol in the presence of NaBH₄.

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核壳型巯基化氧化石墨烯包覆TiO2上金纳米粒子的有效固载及其在4-硝基苯酚还原中的催化应用

我们描述了一种杂化纳米材料的合成，该材料包括核壳型乙醇酸钛-巯基功能化石墨烯复合材料(TG@GOS)，作为固定金纳米颗粒的支撑。TG@GOS是通过将乙醇酸钛包裹在氧化石墨烯中，将TG@GO硫代化而合成的。金与硫的相互作用主要通过硫醇官能团连接，众所周知，与羟基和胺等其他官能团相比，金与硫的共价au键(键强度约为40 kcal/mol)较强。因此，我们提出，在PVP作为表面活性剂的情况下，还原的金离子可以很容易地与TG@GOS上的硫基结合并生长成纳米颗粒。通过水解将乙醇酸钛转化为TiO2。采用TEM、SEM、XRD、UV-vis等方法对催化剂(TiO2@GOS@Au)进行了表征，并对NaBH4存在下4-硝基苯酚的还原性能进行了测试。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.