Topochemical synthesis and catalysis of metal nanoparticles exposed on crystalline cellulose nanofibers

Koga, Hirotaka; Tokunaga, Eriko; Hidaka, Mami; Umemura, Yuuka; Saito, Tsuguyuki; Isogai, Akira; Kitaoka, Takuya

doi:10.1039/c0cc02754e

Cited by 218 publications

(140 citation statements)

References 26 publications

Supporting

Mentioning

130

Contrasting

Unclassified

Order By: Relevance

“…400 nm, ascribed to the 4-nitrophenolate ion [3,10], gradually decreases, while a new peak at ca. 300 nm, assigned to 4-AP [3,10] appears. The reaction with the AuAgNPs @ ZnO whiskers was almost complete within 360 s under continuous stirring.…”

Section: @ Zno Whisker and Papermentioning

confidence: 99%

“…83.8 eV, assigned to the characteristic peak of Au(0) [36], appears (Figure 3(b)), which indicates the NPs shown in Figure 1(b) correspond to AuNPs. On the basis of previous reports for the synthesis of Au on metal oxides, via a deposition-precipitation method [37,38], it is proposed that the formation of AuNPs on the ZnO whiskers proceeds as follows: (1) [39] due to electrostatic interactions; (3) thermal treatment at 100 °C leads to the formation of Au(OH) 3 on the surfaces of the ZnO whiskers; and (4) the Au(OH) 3 is thermally reduced to AuNPs under calcination treatment at 300 °C. When the AuNPs @ ZnO whiskers are treated with AgNO 3 , sodium citrate and hydroquinone, the two peaks for Ag3d 3/2 and Ag3d 5/2 at ca.…”

Section: Auagnps Synthesis On the Zno Whiskersmentioning

confidence: 99%

“…The recent escalation of energy, environmental and resource issues has led to the ever increasing importance of catalytic processes. Thus, extensive efforts have been devoted to the development of high-performance catalytic materials that can promote desired reactions more effectively and selectively [1][2][3]. In particular, nano-sized metal particles attract increasing attention as highly active heterogeneous catalysts, due to their unique electronic properties and extremely large specific surface areas [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

Self Cite

View full text Add to dashboard Cite

Bimetallic nanoparticles have attracted significant attention as their electrochemical and catalytic properties being superior to those of the individual component nanoparticles. In this study, gold-silver hybrid nanoparticles (AuAgNPs) with an Au core -Ag shell nanostructure were successfully synthesized on zinc oxide (ZnO) whiskers. The as-prepared nanocatalyst, denoted AuAgNPs @ ZnO whisker, exhibits an excellent catalytic efficiency in the aqueous reduction of 4-nitrophenol to 4-aminophenol; the turnover frequency was up to 40 times higher than that of each component nanoparticle. Their unique features were attributed to the electronic ligand effect at the bimetallic interface. In addition, the AuAgNPs were synthesized on a ZnO whisker-containing paper with a fiber-network microstructure, which was prepared via a papermaking technique. The paper-structured AuAgNPs composite possessed both a paper-like practical utility and a good catalytic performance. Furthermore, the on-paper synthesis process for these bimetallic nanocatalysts is facile. These easy-to-handle nanocatalyst hybrid composites are expected to find a wide range of applications in various chemical and catalytic processes.

show abstract

Section: @ Zno Whisker and Papermentioning

confidence: 99%

Section: Auagnps Synthesis On the Zno Whiskersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…15. The characteristic peaks at 300 nm and 400 nm are due to 4-AP and 4-NP [10,56], respectively. The AuNPs@ZnO paper gave a much higher catalytic efficiency than the AuNPs@ZnO whiskers and the Au/ZnO powder ; complete conversion of 4-NP to 4-AP was achieved within 10 min.…”

Section: Co Oxidation and 4-nitrophenol Reduction Using Aunps@zno Papermentioning

confidence: 99%

“…In particular, the gas-phase CO oxidation (CO+1/2O2 CO2) [11] and the liquid-phase 4-NP reduction [10,56] have been investigated energetically. Therefore, in this study the catalytic performance of AuNPs@ZnO paper was evaluated for CO oxidation [32] and 4-NP reduction [33].…”

Section: Co Oxidation and 4-nitrophenol Reduction Using Aunps@zno Papermentioning

confidence: 99%

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

Koga

Kitaoka²

2011

Sen-i Gakkaishi

Self Cite

View full text Add to dashboard Cite

Metal catalysts have played essential roles in a wide range of chemical industrial processes [1][2][3]. For example, the copper/zinc oxide (Cu/ZnO) catalyst has been especially important for methanol synthesis [4] and alcohol reforming to produce hydrogen for fuel cell applications [5]. Energy, environmental and resource problems have escalated in recent times. Therefore, the development of high-performance catalytic materials that can effectively and selectively promote desired reactions is required for sustainability. Metal nanocatalystsNanosized metal particles have received an increasing amount of attention in various fields, such as in electronic [6], optical [7] and biomedical [8] applications, because of their unique and specific properties. In particular, the extremely large specific surface areas of metal nanoparticles (NPs) are very advantageous for effective catalytic reactions [9]. This has led to the active use of metal NPs as heterogeneous catalysts for a variety of industrial processes [9] including energy conversion, fine chemical synthesis and environmental cleanup. For example, gold (Au) nanocatalysts have received considerable interest for use in various reactions, including the reduction of 4-nitrophenol (4-NP) in the liquid phase [10] and low-temperature carbon monoxide (CO) oxidation [11] in the gas phase, even though bulk Au is typically regarded as an ineffective catalyst. However, the practical implementation of metal NPs is difficult, because they are difficult to handle and they aggregate easily, which minimizes their surface area. The aggregation of metal NPs results in the formation of ordinary bulk metals, and this consequently deteriorates their excellent functionalities. Therefore, catalytic metal NPs are generally attached to various support materials, such as polymers [9,12] and metal oxide powders [9,13]. Since these supported catalysts are fine and are handled with difficulty in practice, they are generally fashioned as beads or pellets. This eventually decreases their catalytic reactivity, because of the poor contact efficiency between the reactants and the catalytically active sites [14]. In addition, filling a reactor with solid catalysts can cause a high pressure drop, local reactant flow and an uneven thermal environment inside the catalyst layer, leading to an inefficient overall process, particularly for flow-type reactions. Therefore, establishing an efficient and practical immobilization technique that enables highly active metal NPs to be attached to and exposed on easyto-handle porous matrices is a challenge. On-paper Synthesis of Metal Nanoparticles for Catalytic ApplicationsDepartment of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan ( † Present address : Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)Abstract: We discuss the successful in ...

show abstract

Environmental Science and Engineering Applications of Polymer and Nanocellulose‐Based Nanocomposites

Thondavada¹,

Chokkareddy²,

Naidu³

et al. 2019

Composites for Environmental Engineering

View full text Add to dashboard Cite

Topochemical synthesis and catalysis of metal nanoparticles exposed on crystalline cellulose nanofibers

Cited by 218 publications

References 26 publications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

Environmental Science and Engineering Applications of Polymer and Nanocellulose‐Based Nanocomposites

Contact Info

Product

Resources

About