Borohydride Reduction Method for PdIn/C Electrocatalysts Synthesis towards Glycerol Electrooxidation under Alkaline Condition

2021 ◽  
Author(s):  
Júlio Nandenha ◽  
Carlos Eduardo Domingues Ramos ◽  
Sirlane G. Silva ◽  
Rodrigo Fernando Brambilla Souza ◽  
Eric Hossein Fontes ◽  
...  
Keyword(s):  
Reduction Method ◽  
Alkaline Condition ◽  
Borohydride Reduction ◽  
Glycerol Electrooxidation

Silver Nanoparticles with Enhanced Fluorescence Effects on Fluorescein Derivative

2012 ◽  
Vol 602-604 ◽  
pp. 187-191 ◽  
Author(s):  
Chun Yang ◽  
Feng Yan Ge ◽  
Jin Cai Li ◽  
Zai Sheng Cai ◽  
Fang Fang Qin
Keyword(s):  
Silver Nanoparticles ◽  
Reduction Method ◽  
Fluorescent Dyes ◽  
Ph Value ◽  
Fold Increase ◽  
Borohydride Reduction ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence ◽  
Fluorescence Efficiency ◽  
Sodium Borohydride Reduction

Silver nanoparticles were prepared by sodium borohydride reduction method for analyzing metal-enhanced fluorescence property. Some variables including the dosage of reagent, reacting temperature and pH value had been investigated. Subsequently, a comparison of metal-enhanced fluorescence efficiency was made between two kinds of fluorescent dyes, namely fluorescein and 6-carboxyfluorescein at different silver concentrations. The experimental results show that the fluorescence of both dyes are remarkably enhanced. It is interesting to note that the increase of emission intensity is stronger than that of their corresponding excitation ones. Furthermore, a 5.038-fold increase in fluorescence for 6-carboxyfluorescein while a 2.506-fold increase for fluorescein are observed. This may attribute to the interaction between dyes and silver nanoparticels.

scholarly journals Lignin Biopolymer for the Synthesis of Iron Nanoparticles and the Composite Applied for the Removal of Methylene Blue

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3847
Author(s):  
Fang-Yi Peng ◽  
Pei-Wen Wang ◽  
Weisheng Liao ◽  
Ing-Song Yu
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Environmental Remediation ◽  
Present Method ◽  
Room Temperature ◽  
Iron Nanoparticles ◽  
Reduction Method ◽  
Environmental Pollutants ◽  
Borohydride Reduction ◽  
Natural Polymer

In the current study, lignin, an abundant natural polymer, was dissolved in ethylene glycol and acidic H2O to form nanoscale lignin. Then, zero-valent iron (ZVI) nanoparticles were synthesized in nanoscale lignin, producing a nZVI/n-lignin composite, via the borohydride reduction method. The use of nZVI/n-lignin for environmental remediation was tested by the removal of methylene blue in aqueous solutions at room temperature. The nZVI/n-lignin composite achieved a higher methylene blue removal ratio than that achieved by traditional nZVIs. Moreover, its excellent dispersibility in water and stability against oxidation in the air were observed. The functions of the nanoscale lignin in the composite material are (1) prevention of further growth and aggregation of the nZVI nanoparticles, (2) protection of nZVI from serious oxidation by H2O/O2, and (3) allowing better dispersibility of nZVI in aqueous solutions. These three functions are important for the field applications of nZVI/n-lignin, namely, to travel long distances before making contact with environmental pollutants. The present method for producing nZVI/n-lignin is straightforward, and the combination of nZVI and lignin is an efficient and environmentally friendly material for environmental applications.

Pd-Based Electrocatalysts Prepared by Borohydride Reduction Method for Methanol and Ethanol Electro-Oxidation in Alkaline Medium

2016 ◽  
Vol 869 ◽  
pp. 987-991
Author(s):  
Michele Brandalise ◽  
Marcelo Marques Tusi ◽  
Estevam Vitorio Spinacé ◽  
Almir Oliveira Neto
Keyword(s):  
Carbon Black ◽  
Alkaline Medium ◽  
Reduction Method ◽  
Atomic Ratio ◽  
Reducing Agent ◽  
Porous Coating ◽  
Borohydride Reduction ◽  
Coating Technique ◽  
Metal Sources ◽  
Electro Oxidation

Pd/C, Au/C, AuBi/C, PdAu/C, PdAuBi/C electrocatalysts (with different atomic ratios and 20 wt% of metal loading) were prepared by borohydride reduction method using a water/2-propanol mixture as solvent, Pd (NO3)2.2H2O, HAuCl4.3H2O and Bi (NO3)3.5H2O as metal sources, carbon black Vulcan XC72 as support and NaBH4 as reducing agent. The activities of the prepared electrocatalysts for methanol and ethanol electro-oxidation in alkaline medium were investigated by chronoamperometry using the thin porous coating technique. Chronoamperometry experiments showed that PdAu/C (Pd:Au atomic ratio of 50:50) has superior activity and stability for methanol and ethanol electro-oxidation compared with other catalysts.

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