Hybrid covalent organic framework trzn-COF (pore size 2.3 nm) is decorated with gold nanoparticles via a one pot aqueous method using HEPES as a reducing buffer. Transmission electron microscopy studies reveal the deposition of Au NPs all over the trzn-COF and the size distribution of gold (Au) nanoparticles was observed to be in the 50 – 200 nm range. The catalytic activity of the synthesized hybrids was evaluated using methyl orange and methylene blue degradation under ambient air conditions using in situ UV-Vis spectroscopy. Methyl orange degradation proceeds to completion with k = 1.15 min-1 (first order) and degradation of methylene blue displayed similar kinetics. Further, as cobalt nanoparticles reportedly exhibit strong affinity towards azo dyes, a trzn-COF hybrid with cobalt (Co) nanoparticles was synthesized which exhibited k = 0.67 min-1 (first order). The fastest rate of degradation k = 2.26 min-1 (first order) was observed with the bimetal-COF (both Au and Co) hybrid which is attributed to the synergy between Au and Co nanoparticles. Our studies will help in developing better materials for efficient capture and degradation of a variety of organic pollutants under in operando conditions. Future studies are aimed to understand (a) mechanism of degradation by hybrid COFs and (b) synergy between Au and Co during catalysis.

Catalytic degradation of organic pollutants using hybrid covalent organic frameworks

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.