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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la902950x
|2 doi
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|a pubmed25n0644.xml
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|a (DE-627)NLM193244454
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|a (NLM)19957940
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Saha, Sandip
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Photochemical green synthesis of calcium-alginate-stabilized Ag and Au nanoparticles and their catalytic application to 4-nitrophenol reduction
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 26.04.2010
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|a Date Revised 21.11.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a Silver and gold nanoparticles have been grown on calcium alginate gel beads using a green photochemical approach. The gel served as both a reductant and a stabilizer. The nanoparticles were characterized using UV-visible spectroscopy, X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), energy dispersive X-ray (EDS), and selected area electron diffraction (SAED) analyses. The particles are spherical, crystalline, and the size ranges for both Ag and Au nanoparticles are <10 nm. It is noticed from the sorption experiment that the loading of gold on calcium alginate beads is much more compared to that of Ag. The effectiveness of the as-prepared dried alginate-stabilized Ag and Au nanoparticles as a solid phase heterogeneous catalyst has been evaluated, for the first time, on the well-known 4-nitrophenol (4-NP) reduction to 4-aminophenol (4-AP) in the presence of excess borohydride. The reduction was very efficient and followed zero-order kinetics for both Ag and Au nanocomposites. The effects of borohydride, initial 4-NP concentration, and catalyst dose were evaluated. The catalyst efficiency was examined on the basis of turnover frequency (TOF) and recyclability. The catalytic efficiency of alginate-based Ag catalyst was much more compared to that of the Au catalyst. The as-prepared new solid-phase biopolymer-based catalysts are very efficient, stable, easy to prepare, eco-friendly, and cost-effective, and they have the potential for industrial applications
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Alginates
|2 NLM
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|a Aminophenols
|2 NLM
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|a Gels
|2 NLM
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|a Nitrophenols
|2 NLM
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|a Silver
|2 NLM
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|a 3M4G523W1G
|2 NLM
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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|a 4-aminophenol
|2 NLM
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|a R7P8FRP05V
|2 NLM
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|a Calcium
|2 NLM
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|a SY7Q814VUP
|2 NLM
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|a 4-nitrophenol
|2 NLM
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| 650 |
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|a Y92ZL45L4R
|2 NLM
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| 700 |
1 |
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|a Pal, Anjali
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kundu, Subrata
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Basu, Soumen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Pal, Tarasankar
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 26(2010), 4 vom: 16. Feb., Seite 2885-93
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
1 |
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|g volume:26
|g year:2010
|g number:4
|g day:16
|g month:02
|g pages:2885-93
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|u http://dx.doi.org/10.1021/la902950x
|3 Volltext
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|h 2885-93
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