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Chemoselective Hydrogenation of Nitroarenes by an Efficient Co@NC/AC Catalyst. Catal Letters 2022. [DOI: 10.1007/s10562-022-04085-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Parida D, Moreau E, Nazir R, Salmeia KA, Frison R, Zhao R, Lehner S, Jovic M, Gaan S. Smart hydrogel-microsphere embedded silver nanoparticle catalyst with high activity and selectivity for the reduction of 4-nitrophenol and azo dyes. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126237. [PMID: 34492989 DOI: 10.1016/j.jhazmat.2021.126237] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 05/06/2021] [Accepted: 05/24/2021] [Indexed: 06/13/2023]
Abstract
A simple method is reported for the preparation of silver nanoparticle (AgNP) embedded pH-responsive hydrogel microparticle catalyst via Michael addition gelation and in-situ silver nitrate (AgNO3) reduction. The AgNP-hydrogel microsphere exhibited an efficient reduction of pollutants like 4-Nitrophenol (4-NP) and Congo red (CR) under acidic medium with turn over frequency (TOF) of ~170 h-1 and ~124 h-1 respectively. Interestingly, the activity of the catalysts was turned-OFF under a basic medium (≥ pH 12) due to the deswelling pH-responsive matrix surrounding the AgNPs. On the contrary, turning-OFF the hydrogenation of a cationic pollutant like methylene blue (MB) using high pH (≥ 12) was not possible, due to ionic interaction of MB molecules with the negatively charged catalyst at this pH. This feature was used to demonstrate selective hydrogenation of only MB from a mixture of 4-NP and MB. Finally, five recycling steps confirmed the reusability and practical application potential of the catalyst.
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Affiliation(s)
- Dambarudhar Parida
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland.
| | - Eva Moreau
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland
| | - Rashid Nazir
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland
| | - Khalifah A Salmeia
- Department of Chemistry, Faculty of Science, Al-Balqa Applied University, 19117 Al-Salt, Jordan
| | - Ruggero Frison
- Center for X-Ray Analytics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dubendorf CH-8600, Switzerland
| | - Ruohan Zhao
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland
| | - Sandro Lehner
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland
| | - Milijana Jovic
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland
| | - Sabyasachi Gaan
- Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, St Gallen CH-9014, Switzerland.
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