Catecholamine-Induced Electroless Metallization of Silver on Silica@Polymer Hybrid Nanospheres and Their Catalytic Applications

Xu, Liqun; Yap, Beatrice Swee Min; Wang, Rong; Neoh, K. G.; Kang, En‐Tang; Fu, Guo Dong

doi:10.1021/ie403840p

Cited by 25 publications

(15 citation statements)

References 49 publications

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“…From the slope of the plot of ln k app against 1/T, the Ea for the Ag NPs was determined to be 23.03 kJ mol -1 , which was much smaller than some clad metal catalysts (the Ea for Ag based catalysts is 30-40 kJ mol -1 [37,[44][45][46], the Ea for Fe 3 O 4 based catalysts is 30-40 kJ mol -1 [47]). Usually, for surface-catalyzed reactions, the Ea value lies between 8.4 kJ mol -1 and 41.9 kJ mol -1 [48].…”

Section: Table1 Recent Studies On the Reduction Of 4-np Using Varioumentioning

confidence: 93%

Single Metal of Silver Nanoparticles in the Microemulsion for Recyclable Catalysis of 4-Nitrophenol Reduction

Zhao¹,

Duan²,

Xiao³

et al. 2017

JAN

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Abstract. Size control of silver nanoparticles (Ag NPs) to improve monodispersity and recyclability is crucial for application in nanocatalysts. Hence, a novel and effective protocol for in-situ synthesis of Ag NPs in the microemulsion was proposed. The surfactant-stabilized microcavity in microemulsion can provide a nanoscale reactor that limits nucleation, growth, and agglomeration of the particles. Ag NPs of 540-640 nm were successfully grown and exhibited excellent catalytic activity with the apparent rate constant (k) of 0.59 min -1 and the activation energy (Ea) of 23.03 kJ mol -1 toward the reduction of 4-nitrophenol. Moreover, the catalyst could be easily recycled and showed excellent reusability after 6 cycles. So, the silver nanoparticles can be extended to an important metalcatalyzed reduction in chemical industry, which is of great significance for the sustainable development.Keywords: Silver nanoparticles, microemulsion, 4-NP, catalytic [22]. Especially, microemulsion synthesis has been demonstrated to be a very promising method due to its precise control on morphology and dimension of nanoparticles [22]. From the viewpoints of colloid and interface chemistry, there are two types of microemulsions, reversed (water/oil) and direct (oil/water) microemulsion [23][24][25]. These systems are transparent, isotropic liquid media composed of discrete, thermodynamically stable [20]. The surfactant-stabilized microcavity in microemulsion can provide a nanoscale reactor that limits nucleation, growth, and agglomeration of the particles [22]. Accordingly, we could use this method to get Ag NPs with a controlled dimension. IntroductionAs we all know that 4-nitrophenol (4-NP) shows one of the most notorious toxic pollutants in the industrial effluents [26]. 4-aminophenol (4-AP) is very useful and important in many applications including analgesic and antipyretic drugs, photographic development, corrosion inhibition, anticorrosion lubrication, hair-dyeing agent etc [27]. Therefore enormous current interests have arisen in the development of catalysts for reduction of the 4-NP to 4-AP [28][29][30]. Traditional methods for this process usually involve reduction/catalytic hydrogenation [31][32][33][34][35]. Considering these aspects, sizecontrolled synthesis of Ag NPs for 4-NP transformations in a simple, cost-effective, and selective manner is highly demanding [26].We herein report our new efforts to synthesize Ag nanoparticles by the microemulsion method. Through our research, most of catalysts were alloy or compound of silver nanoparticles traditionally. A single metal of Ag NPs were manufactured in our work through a simple and fast method. In this system, o-phenylenediamine (oPD) was used as a weak reductive agent, who has been employed to produce silver

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Section: Table1 Recent Studies On the Reduction Of 4-np Using Varioumentioning

confidence: 93%

Single Metal of Silver Nanoparticles in the Microemulsion for Recyclable Catalysis of 4-Nitrophenol Reduction

Zhao¹,

Duan²,

Xiao³

et al. 2017

JAN

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“…In addition, silica coating also ensures enhanced hydrophilicity, superior colloidal stability and fewer nonspecific interactions [51]. A classical synthesis protocol for cultivating a silica shell around AgNP core comprises a preliminary exchange of hydrophobic ligands with primer molecules such as poly-(vinyl-pyrrolidone (PVP) [52], 11-mercaptoundecanoic acid (MUDA) [53], 3-(trimethoxysilyl) propyl methacrylate (MPS) [54], cationic surfactants such as cetyltrimethylammoniumbromide (CTAB) [55], cetyltrimethylammonium nitrate (CTAN) [56] and 3-aminopropyltrimethoxysilane (APTMS) [57]. Afterward, the growth of amorphous silica shell via hydrolysis of sodium silicate [58], tetraethoxysilane [59], tetraethyl orthosilicate (TEOS) [60] proceeds in an alkaline environment to yield Ag-core shell nanostructures.…”

Section: Aqueous Phase Stabilization Of Surface Stabilized Agnpsmentioning

confidence: 99%

Emerging trends in clinical implications of bio-conjugated silver nanoparticles in drug delivery

Prasher

Sharma

Mudila

et al. 2020

Colloid and Interface Science Communications

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From nanopharmaceutics to renewable energy, silver nanoparticles (AgNPs) present innumerable applications in the contemporary era. However, the associated toxicity to the biosystems limits their application. Effective utilization of AgNPs, therefore, requires their surface conjugation with biologically benevolent moieties that enhance the bio-acceptability of silver-based nanosystems, and supplementary functionalities for further extension of their unique applications. The clinical importance of AgNPs was established long ago, but their clinical utilization has been explored only recently with the phenomenon of bio-conjugation. The biomolecule-conjugated AgNPs present operable solutions for tedious clinical complications of the present era, such as multidrug resistance, designing of pharmaceuticals with improved bioavailability, superior drug delivery vehicles and in situ bio imaging of important metabolites that utilize the biomolecule-anchored surface engineered AgNPs. This review epigrammatically discusses some interesting clinical applications of surface conjugated AgNPs with biomolecules such as peptides, nucleic acids, amino acids and antibodies in the current nanopharmaceutical paradigm.

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“…To establish the reduction of p-nitrophenol, catecholaminecoated SiO 2 nanospheres were prepared via a combined sol-gel reaction, distillation-precipitation polymerization and reactive ester-amine reaction by Xu et al 64 The SiO 2 @poly-( pentafluorophenyl acrylate-co-methacrylic acid/co-ethylene glycol dimethacrylate) (or SiO 2 @PPFA) core-shell nanospheres were first prepared by distillation-precipitation polymerization using the SiO 2 -3-(trimethoxysilyl)propyl methacrylate (SiO 2 -MPS) nanospheres from the sol-gel reaction as seeds. The reactive pentafluorophenyl (PFP) ester moieties on the SiO 2 @PPFA nanospheres reacted readily with dopamine hydrochloride to form amide linkages, with no side reaction, under mild conditions.…”

Section: Reduction Reactionmentioning

confidence: 99%

Silica-nanosphere-based organic–inorganic hybrid nanomaterials: synthesis, functionalization and applications in catalysis

et al. 2015

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Catecholamine-Induced Electroless Metallization of Silver on Silica@Polymer Hybrid Nanospheres and Their Catalytic Applications

Cited by 25 publications

References 49 publications

Single Metal of Silver Nanoparticles in the Microemulsion for Recyclable Catalysis of 4-Nitrophenol Reduction

Single Metal of Silver Nanoparticles in the Microemulsion for Recyclable Catalysis of 4-Nitrophenol Reduction

Emerging trends in clinical implications of bio-conjugated silver nanoparticles in drug delivery

Silica-nanosphere-based organic–inorganic hybrid nanomaterials: synthesis, functionalization and applications in catalysis

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