Design of chitosan nanocomposite hydrogel for sensitive detection and removal of organic pollutants

In this project, cerium oxide-cobalt oxide (CeO2-Co2O3) nanocomposite-based material have been simply syn-thesized and intercalated to chitosan (CH) hydrogel to prepare CH/CeO2-Co2O3 nanocomposite hydrogel. CH/CeO2-Co2O3 nanocomposite was applied to nitrophenols reduction where it displayed perfect catalytic activity for 4-nitrophenol as compared to 2-nitrophenol and 2,6-dinitrophenol. Various factors were tested for optimiza-tion of catalytic removal approach. Farther, CH/CeO2-Co2O3 nanocomposite catalyst was coated on cotton cloth (CC) as support, which provided high catalytic performance even after reusing three times. CeO2-Co2O3 nano -composites was also employed as electrochemical sensor where CeO2-Co2O3 was coated on pencil-graphite lead electrode (PGLE) and glassy carbon electrode (GCE) and used as working electrodes to detect different nitrophenols electrochemically via cyclic voltammetry. CeO2-Co2O3 was more selective toward 4-nitrophenol and the reduction peak of 4-nitrophenol was much more enhanced with increase in concentration ranging from 11.80 to 48.75 mu M. The detection limit was found to be 0.46 mu M (S/N = 5). Thus, the prepared materials were selective for detection and removal of 4-nitrophenol. Various factors were tested to optimize best condi-tions for developed nanocomposite materials in electrochemical sensing and catalytic removal approaches. Thus, it is expected that the designed nanocomposite will be able to employ as promising material for providing clean water. (C) 2020 Elsevier B.V. All rights reserved.