Gold nanoparticle embedded hydrogel matrices as catalysts: better dispersibility of nanoparticles in the gel matrix upon addition of N-bromosuccinimide leading to increased catalytic efficiency
| Title | Gold nanoparticle embedded hydrogel matrices as catalysts: better dispersibility of nanoparticles in the gel matrix upon addition of N-bromosuccinimide leading to increased catalytic efficiency |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Ramtenki, V, Anumon, VD, Badiger, MV, Prasad, BLV |
| Journal | Colloids and Surfaces A-Physicochemical and Engineering Aspects |
| Volume | 414 |
| Pagination | 296-301 |
| Date Published | NOV |
| ISSN | 0927-7757 |
| Keywords | catalysis, hydrogels, Immobilization, Nanoparticles, Turn over numbers |
| Abstract | A simple and convenient method for generating and immobilizing gold NPs into polyethylene glycol-polyurethane (PEGPU) matrices is presented. The gold NP immobilized PEGPU (Au NP-PEGPU) hydrogel matrices are easy to handle and can be used as catalysts. The efficiency, reusability and durability of the Au NP-PEGPU catalyst matrices were investigated using the reduction of 4-nitroaniline (4NA) to p-phenylenediamine (p-PDA) by sodium borohydride in the presence of the catalyst as a test reaction. The Au NPs in the PEGPU matrix got aggregated after 3 cycles of catalysis but dispersion could be regenerated by the addition of N-bromosuccinimide (NBS). After this regeneration process the Au NPs-PEGPU matrix showed excellent efficiency without any aggregation, leaching or degradation. The reusability of the catalyst for 28 cycles yielding a total turnover number of 3220 and turn over frequency of 0.152 s(-1) is demonstrated. (C) 2012 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.colsurfa.2012.08.026 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 2.108 |