Green synthesis of bimetallic PdAg alloy nanoparticles supported on polydopamine-functionalized kaolin for catalytic reduction of 4-nitrophenol and organic dyes

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2023-08-15 DOI:10.1016/j.clay.2023.107091

Defu Gan , Zhenyu Wang , Xiaodi Li , Jingzhou Zhou , Ben Dai , Lin Yang , Siqing Xia

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引用次数: 2

Abstract

A green and universal synthesis strategy was demonstrated for preparation of bimetallic PdAg alloy nanoparticles supported on polydopamine-functionalized kaolin (kaolin-PDA-PdAg), where bimetallic PdAg alloy was synthesized by co-reduction of Na₂PdCl₄ and AgNO₃ with sodium citrate. Characterization results, including TEM results and XPS results, confirmed that bimetallic PdAg was alloying state and kaolin-PDA-PdAg was successfully synthesized through mussel-inspired chemistry. The kaolin-PDA-PdAg nanocomposite exhibited excellent catalytic activity and performance towards reduction of 4-nitrophenol, whose rate constant was found to be 3.46 min⁻¹ under condition of high concentration (10 mM) of 4-nitrophenol. Besides, kaolin-PDA-PdAg nanocomposite showed high catalytic performance for methyl orange and safranine-T as well. The high catalytic activity of kaolin-PDA-PdAg could be elucidated by electronic effect and synergistic effect of bimetallic PdAg alloy. These results suggest that kaolin-PDA-PdAg composites could be applied as high-efficiency catalysts for reduction of 4-nitrophenol and degradation of organic dyes. Furthermore, abundance and low-priced of raw materials kaolin, green and versatility of synthetic method endow kaolin-PDA-PdAg composites with broad application prospects. Strategy of bimetallic PdAg alloy anchored on kaolin in this text could provide an efficient platform for synthesis of bimetallic alloy nanoparticles loaded on various materials.

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聚多巴胺功能化高岭土负载双金属PdAg合金纳米颗粒催化还原4-硝基苯酚和有机染料的绿色合成

以Na2PdCl4和AgNO3与柠檬酸钠共还原法制备了聚多巴胺功能化高岭土(高岭土- pda -PdAg)为载体的双金属PdAg合金纳米颗粒，提出了一种绿色通用的合成策略。表征结果，包括TEM和XPS结果，证实双金属PdAg呈合金态，并通过贻贝启发化学成功合成了高岭土- pda -PdAg。高岭土- pda - pdag纳米复合材料对4-硝基苯酚的还原具有优异的催化活性和性能，在高浓度(10 mM) 4-硝基苯酚条件下，其还原速率常数为3.46 min−1。此外，高岭土- pda - pdag纳米复合材料对甲基橙和藏红花碱- t也表现出较高的催化性能。高岭土- pda -PdAg的高催化活性可以通过双金属PdAg合金的电子效应和协同效应来解释。这些结果表明，高岭土- pda - pdag复合材料可作为4-硝基苯酚还原和有机染料降解的高效催化剂。此外，高岭土原料丰富、价格低廉、合成方法绿色环保、通用性强，使高岭土- pda - pdag复合材料具有广阔的应用前景。本文研究的双金属PdAg合金在高岭土上的锚定策略为负载多种材料的双金属合金纳米颗粒的合成提供了一个有效的平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...