Inorganic Chemistry Communications, vol.126, pp.1-9, 2021 (SCI-Expanded)
The catalytic effects of metal nanoparticles (MNPs) synthesized in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) microemulsion system by using magnetic M (II) salts (Fe, Co, Ni) and NaBH4 reducing agent on methylene blue (MB) degradation reaction were investigated. It was determined that Co-MNPs gave the best catalytic activity among them. Influence of the reaction parameters (reaction time, temperature, the size of catalyst etc.) on the catalytic performance has been studied. As a result of the works, 37 ± 6 nm Co-MNPs showed the best catalytic activity in all studies. The best activation parameters were calculated as 13.6±1.1 kJ mol-1 and ΔH= 10.7±1.0 kJ mol-1 and ΔS=-87.9±5.4 J.mol-1K-1. The activity of Co-MNPs was calculated as 85.4% after 30 days on the shelf life study. Reusability studies were carried out and the activity of Co-MNPs in the 5th reuse was calculated as 70±5%. Finally, the catalytic activity of Co-MNPs was investigated in equal volume single and multiple solution mixtures containing MB, 4-Nitrophenol (4-NP) and Eosin Y (EY). In the examinations, it was observed that the nanocatalyst was effective as a reducing agent in all equal amount solutions (MB/4-NP, MB/EY, 4-NP/EY, MB/4-NP/EY). And also, TOF (mole of MB/4-NP/EY) (mol catalyst.min)-1 values of catalytic activities were also calculated.