Oxygen plasma synthesis of Pd/GO with enhanced co-adsorption ability of 4-nitrophenol and NaBH4 for boosting 4-nitrophenol reduction activity

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-03-05 DOI:10.1016/j.apcata.2025.120203

Lingyu Zhao , Xiaonan Du , Fei Gao , Yue Hua , Hong Li , Xiuling Zhang , Lanbo Di

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引用次数: 0

Abstract

Herein, oxygen plasma was adopted to prepare graphite oxide (GO) supported Pd catalyst (Pd/GO-O₂P) with abundant oxygen-containing functional groups (OCGs) and defects on the support, and small-sized Pd nanoparticles. These enhanced the co-adsorption of the 4-nitrophenolate anions and BH₄^- on the Pd/GO-O₂P catalyst, and promoted the generation of H*ads (adsorbed hydrogen on the catalyst surface) and H*abs (absorbed hydrogen in the catalyst lattices), which greatly accelerated the reaction rate from 4-NP to 4-AP. The rate constant k of Pd/GO-O₂P for 4-NP reduction is up to 3.47 min⁻¹, which is 15.8 and 347 times that of commercial Pd/C (Sigma-Aldrich) and thermal reduction-prepared Pd/rGO-H₂C, respectively. After seven reaction cycles, the k value of Pd/GO-O₂P was still as high as 72.6 % of the initial value. Oxygen plasma can realize simple, fast and green preparation of high-performance 4-NP reduction catalysts, which has important reference significance for accurate design, preparation, and application of metal catalysts.

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在这里，采用氧等离子体制备了氧化石墨（GO）支撑钯催化剂（Pd/GO-O2P），其支撑体上具有丰富的含氧官能团（OCGs）和缺陷，以及小尺寸的钯纳米颗粒。这些因素增强了 4-硝基苯酚阴离子和 BH4- 在 Pd/GO-O2P 催化剂上的共吸附，促进了 H*ads（催化剂表面吸附的氢）和 H*abs（催化剂晶格中吸收的氢）的生成，从而大大加快了从 4-NP 到 4-AP 的反应速率。Pd/GO-O2P 还原 4-NP 的速率常数 k 高达 3.47 min-1，分别是商用 Pd/C（Sigma-Aldrich）和热还原制备的 Pd/rGO-H2C 的 15.8 倍和 347 倍。经过七个反应循环后，Pd/GO-O2P 的 k 值仍高达初始值的 72.6%。氧等离子体可实现高性能 4-NP 还原催化剂的简单、快速和绿色制备，对金属催化剂的精确设计、制备和应用具有重要的参考意义。

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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.