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A soft hydrogel reactor for cobalt nanoparticle preparation and use in the reduction of nitrophenols

Paper ID Volume ID Publish Year Pages File Format Full-Text
47090 46458 2010 7 PDF Available
Title
A soft hydrogel reactor for cobalt nanoparticle preparation and use in the reduction of nitrophenols
Abstract

Bulk poly(2-acrylamido-2-methyl-1-propansulfonic acid) (p(AMPS)) hydrogels were prepared by irradiation of an aqueous solution of AMPS in the presence of crosslinker and photoinitiator. These p(AMPS) hydrogel networks were utilized for in situ cobalt nanoparticle synthesis by reduction of metal ions absorbed into the hydrogel network with a reducing agent, i.e., NaBH4. TEM images confirmed that Co particles are about 100 nm in size. The hydrogel network with embedded Co nanoparticles was utilized as a catalyst in the reduction of 4-nitrophenol (4-NP) and 2-nitrophenol (2-NP) in aqueous media in the presence of an excess amount of NaBH4. The kinetics of the reduction reaction under different reaction conditions was investigated to determine the activation parameters. Activation energies are 27.8 kJ mol−1 and 39.3 kJ mol−1 for 4-NP and 2-NP, respectively. It was found that hydrogel–Co composites were 99% active after 5 days storage.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Elastic hydrogel reactor. ▶ In situ catalyst synthesis. ▶ Hydrogel-composite catalyst systems. ▶ Co nanoparticle embedded in environmentally sensitive flexible hydrogel network.

Keywords
Hydrogel-templates; Flexible hydrogel-reactor; In situ nanoparticle formation; Hydrogel-reaction vessel; Hydrogel-nanocomposites; Co nanoparticles
First Page Preview
A soft hydrogel reactor for cobalt nanoparticle preparation and use in the reduction of nitrophenols
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 101, Issues 1–2, 22 November 2010, Pages 137–143
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis