Synthesis of Gold Nanoparticles on Rice Husk Silica for Catalysis Applications

Li, Yan; Lan, Jeremy Y.; Liu, Jingjing; Yu, Jingfang; Luo, Zhiping; Wang, Weixing; Sun, Luyi

doi:10.1021/acs.iecr.5b00216

Cited by 55 publications

(24 citation statements)

References 78 publications

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“…The reaction rate generally increased with the mass of catalyst. This observation is consistent with the view that an increase in the total surface area and number of reaction sites enhances the catalytic activity [43]. However, when the mass of catalyst was more than 0.02 g, the average rate of increase was decreased obviously (Fig.…”

Section: Catalytic Reduction Of 4-nitrophenolsupporting

confidence: 90%

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: Catalytic Reduction Of 4-nitrophenolsupporting

confidence: 90%

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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“…Several methods have been employed to produce silica from rice husk, [23] with organic functionalization commonly used for the production of adsorbents for water purification, [24][25][26] CO 2 sequestration, [27][28][29] or immobilization of metal nanoparticles. [30][31][32] Organo-functionalized (non-templated) variants have been explored for acetic acid esterification and phenol alkylation. [33,34] The synthesis of mesoporous silicas from rice husk silica using synthetic templates such as Pluronic P-123 and cetyltrimethylammonium bromide yields materials with high surface areas and narrow pore size distributions.…”

Section: Introductionmentioning

confidence: 99%

Valorization of rice husk silica waste: Organo-amine functionalized castor oil templated mesoporous silicas for biofuels synthesis

Elimbinzi

Nyandoro

Mubofu

et al. 2020

Microporous and Mesoporous Materials

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…This shows that the efficiency of the reduction of 4-NP increased in correlation to the catalyst loading. The increase in total surface area and the number of reaction sites can be the cause of this enhanced catalytic activity [44,45]. Table 1 shows the list of rate constant of previously reported Cu-based catalysts for the reduction of 4-NP into 4-AP.…”

Section: Resultsmentioning

confidence: 99%

Rapid Catalytic Reduction of 4-Nitrophenol and Clock Reaction of Methylene Blue using Copper Nanowires

et al. 2019

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Copper nanowires (CuNWs) with a high aspect ratio of ~2600 have been successfully synthesized by using a facile hydrothermal method. The reductions of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) and methylene blue (MB) to leucomethylene blue (LMB) by using sodium borohydride (NaBH4) were used as models to test the catalytic activity of CuNWs. We showed that by increasing the CuNWs content, the rate of reduction increased as well. The CuNWs showed an excellent catalytic performance where 99% reduction of 4-NP to 4-AP occurred in just 60 s by using only 0.1 pg of CuNWs after treatment with glacial acetic acid (GAA). The rate constant (kapp) and activity factor (K) of this study is 18 and ~1010 fold in comparison to previous study done with no GAA treatment applied, respectively. The CuNWs showed an outstanding catalytic activity for at least ten consecutive reusability tests with a consistent result in 4-NP reduction. In clock reaction of MB, approximately 99% of reduction of MB into LMB was achieved in ~5 s by using 2 μg CuNWs. Moreover, the addition of NaOH can improve the rate and degree of recolorization of LMB to MB.

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Synthesis of Gold Nanoparticles on Rice Husk Silica for Catalysis Applications

Cited by 55 publications

References 78 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

Valorization of rice husk silica waste: Organo-amine functionalized castor oil templated mesoporous silicas for biofuels synthesis

Rapid Catalytic Reduction of 4-Nitrophenol and Clock Reaction of Methylene Blue using Copper Nanowires

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