Chitosan/Hydroxyethyl Cellulose Gel Immobilized Polyaniline/CuO/ZnO Adsorptive-Photocatalytic Hybrid Nanocomposite for Congo Red Removal was written by Gelaw, Tadesse Bassie;Sarojini, Balladka Kunhanna;Kodoth, Arun Krishna. And the article was included in Journal of Polymers and the Environment in 2022.Safety of 1,2-Propanediol This article mentions the following:
Advanced photocatalytic degradation based on polymer/metal oxide hybrid composites can convert organic and related pollutants into an environmentally benign product. In this study, chitosan/hydroxyethyl cellulose (CS/HEC) gel immobilized polyaniline (PANI)/CuO/ZnO composite was prepared by in situ oxidative polymerization followed by ex-situ dispersion. The hybrid nanocomposite synthesized was characterized by FESEM, FTIR, EDX, XRD, TGA, and UV-Visible absorption spectroscopy. The degradation study was performed in the optimum time, pH, PANI/CuO/ZnO loading on CS/HEC gel, and catalyst dosage using 100μM Congo red. The correlation coefficients (R2) of pseudo-second-order adsorption kinetics were higher than 0.98 at different temperatures, signifying that the model was well fitted and the chem. interaction between Congo red and the catalyst at the interface. The activation energy of 19.56 kJ/mol showed chemisorption of Congo red at the interface. The neg. values of standard Gibbs free energy demonstrated that the Congo red adsorbed spontaneously to the catalyst surface. According to the Langmuir-Hinshelwood kinetics model, Congo red photocatalytic degradation followed pseudo-first-order kinetics. The decrease in degradation efficiency with the addition of ammonium oxalate and iso-Pr alc. proved that both pos. charged holes and hydroxyl radicals were involved in the catalysis. The catalytic degradation efficiency of the 0.4 g/L catalysts was 99.8 and 93.7% in the 1st and 4th cycle, resp., indicating that it is efficient, stable, and recyclable. The resulting hybrid nanocomposite is a promising photocatalyst for removing anionic dyes. In the experiment, the researchers used many compounds, for example, 1,2-Propanediol (cas: 57-55-6Safety of 1,2-Propanediol).
1,2-Propanediol (cas: 57-55-6) belongs to alcohols. Similar to water, an alcohol can be pictured as having an sp3 hybridized tetrahedral oxygen atom with nonbonding pairs of electrons occupying two of the four sp3 hybrid orbitals. Under carefully controlled conditions, simple alcohols can undergo intermolecular dehydration to give ethers. This reaction is effective only with methanol, ethanol, and other simple primary alcohols.Safety of 1,2-Propanediol
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts