Photocatalytic activity of silver doped Self-Assembled supramolecular catalysts for amoxicillin Removal: Investigation of optimum conditions and reaction kinetics

• Published in: Journal of molecular liquids Vol. 394; p. 123717
• Main Authors: Palas, Burcu, Ersöz, Gülin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-01-2024
• Subjects: Amoxicillin removal; Kinetic modelling; Perylene diimide; Photocatalysis; Self-assembly; Supramolecular catalyst; Self-assembly; Perylene diimide; Supramolecular catalyst; Amoxicillin removal; Photocatalysis; Kinetic modelling
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2023.123717

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•Ag and Co doped bulk and self-assembled perylene diimide supramolecular catalysts were prepared.•Photocatalytic activities of supramolecular catalysts were compared for amoxicillin removal.•The initial amoxicillin concentration, pH and catalyst loading were optimized at 10.3 mg/L, 4.6, and 0.52 g/L, respectively.•Antibiotic degradation in the presence of Ag1/SA-PDI catalyst fit second-order kinetic model.•Toxicity in terms of L.sativum root growth inhibition was evaluated as 1.1%.
Silver and cobalt doped perylene diimide supramolecular catalysts were prepared and their photocatalytic activities were tested for the removal of amoxicillin from aqueous solutions. Both bulk perylene diimide (PDI) and self-assembled perylene diimide (SA-PDI) were synthesized and silver or cobalt was doped at different weight ratios (1 % and 10 %). Among eight type of supramolecular catalysts, Ag1/SA-PDI was determined to be the most suitable photocatalyst. The effects of photocatalytic oxidation parameters including pH, catalyst loading, and the initial amoxicillin concentration were investigated by using response surface methodology. The photocatalytic reaction conditions were optimized at pH 4.6, 0.52 g/L catalyst loading, and 10.3 mg/L amoxicillin concentration. Under the optimum photocatalytic conditions 51.8 % amoxicillin removal efficiency was achieved. According to the radical trapping experiments, hydroxyl radicals were effective in antibiotic removal. Toxicity tests showed that L.sativum root growth inhibition was 1.1 % in treated antibiotic solutions. A kinetic study was realized to derive initial reaction rate expression. Antibiotic degradation in the presence of Ag1/SA-PDI fit second-order kinetic model. Arrhenius constant (frequency) and activation energy were calculated as 1.21 × 105 L.mg−1.min−1 and 49.7 kJ/mol, respectively.