In situ formed metal nanoparticle systems for catalytic reduction of nitroaromatic compounds

RSC Advances ◽  
2014 ◽  
Vol 4 (90) ◽  
pp. 49287-49294 ◽  
Author(s):  
Xiao-Qiong Wu ◽  
Xing-Wen Wu ◽  
Jiang-Shan Shen ◽  
Hong-Wu Zhang
Keyword(s):  
Catalytic Reduction ◽  
Nitroaromatic Compounds ◽  
Metal Nanoparticle

In situ synthesized gold nanoparticles in hydrogels for catalytic reduction of nitroaromatic compounds

2015 ◽  
Vol 331 ◽  
pp. 210-218 ◽  
Author(s):  
Xiao-Qiong Wu ◽  
Xing-Wen Wu ◽  
Qing Huang ◽  
Jiang-Shan Shen ◽  
Hong-Wu Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Reduction ◽  
Nitroaromatic Compounds

In-situ stabilization of silver nanoparticles in polymer hydrogels for enhanced catalytic reduction of macro and micro pollutants

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Luqman Ali Shah ◽  
Rida Javed ◽  
Mohammad Siddiq ◽  
Iram BiBi ◽  
Ishrat Jamil ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Thermo Gravimetric Analysis ◽  
Activation Parameters ◽  
Reduction Reaction ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
In Situ Stabilization ◽  
Hybrid Hydrogels ◽  
Kinetics Of

AbstractThe in-situ stabilization of Ag nanoparticles is carried out by the use of reducing agent and synthesized three different types of hydrogen (anionic, cationic, and neutral) template. The morphology, constitution and thermal stability of the synthesized pure and Ag-entrapped hybrid hydrogels were efficiently confirmed using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermo gravimetric analysis (TGA). The prepared hybrid hydrogels were used in the decolorization of methylene blue (MB) and azo dyes congo red (CR), methyl Orange (MO), and reduction of 4-nitrophenol (4-NP) and nitrobenzene (NB) by an electron donor NaBH4. The kinetics of the reduction reaction was also assessed to determine the activation parameters. The hybrid hydrogen catalysts were recovered by filtration and used continuously up to six times with 98% conversion of pollutants without substantial loss in catalytic activity. It was observed that these types of hydrogel systems can be used for the conversion of pollutants from waste water into useful products.

scholarly journals Further insights into the Fe(ii) reduction of 2-line ferrihydrite: a semi in situ and in situ TEM study

2020 ◽  
Vol 2 (10) ◽  
pp. 4938-4950
Author(s):  
Mario Alberto Gomez ◽  
Ruonan Jiang ◽  
Miao Song ◽  
Dongsheng Li ◽  
Alan Scott Lea ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
In Situ Tem ◽  
Nano Crystalline

The catalytic reduction of nano-crystalline 2-line ferrihydrite with Fe(ii)(aq) doesn't occur via direct pathways but rather through new intermediate steps.

scholarly journals Poly(N-isopropylacrylamide-co-methacrylic acid) microgel stabilized copper nanoparticles for catalytic reduction of nitrobenzene

2015 ◽  
Vol 33 (3) ◽  
pp. 627-634 ◽  
Author(s):  
Zahoor H. Farooqi ◽  
Zonarah Butt ◽  
Robina Begum ◽  
Shanza Rhauf Khan ◽  
Ahsan Sharif ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Methacrylic Acid ◽  
Catalytic Reduction ◽  
Aqueous Media ◽  
Activation Parameters ◽  
Reducing Agent ◽  
Different Temperatures ◽  
Entropy Of Activation ◽  
Micro Reactors

Abstract Poly(N-isopropylacrylamide-co-methacrylic acid) microgels [p(NIPAM-co-MAAc)] were synthesized by precipitation polymerization of N-isopropylacrylamide and methacrylic acid in aqueous medium. These microgels were characterized by dynamic light scattering and Fourier transform infrared spectroscopy. These microgels were used as micro-reactors for in situ synthesis of copper nanoparticles using sodium borohydride (NaBH4) as reducing agent. The hybrid microgels were used as catalysts for the reduction of nitrobenzene in aqueous media. The reaction was performed with different concentrations of cat­alyst and reducing agent. A linear relationship was found between apparent rate constant (kapp) and amount of catalyst. When the amount of catalyst was increased from 0.13 to 0.76 mg/mL then kapp was increased from 0.03 to 0.14 min-1. Activation parameters were also determined by performing reaction at two different temperatures. The catalytic process has been discussed in terms of energy of activation, enthalpy of activation and entropy of activation. The synthesized particles were found to be stable even after 14 weeks and showed catalytic activity for the reduction of nitrobenzene.

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