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        Enhanced photocatalytic degradation of a hydrocortisone by biomodified and biocompatible magnetite nanoparticles and its mechanistic assessment

        Chanchal Das,Narendra Nath Ghosh,Ritu Bhardwaj,Kritika Narula,Prashant Mishra,Goutam Biswas 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

        Every year, due to usage, overproduction, and overprescribing, a huge amount of pharmaceutical wasteaccumulates. Among these, hydrocortisone (a corticosteroid) has lately been popular for COVID-19 therapy. Hence, removal of these pollutants by efficient, cheaper and greener way is needed. The photocatalyticdegradation of hydrocortisone by nanoparticles has yet to be investigated. In this study, thehydro-alcoholic extract of Nigella sativa seeds coated magnetite nanoparticles (NS@MNPs) was synthesizedas a low-cost, sustainable photocatalyst to degrade hydrocortisone from simulated wastewater. At neutral pH, the highest degradation percentage 97.1% was achieved with 15 mg of NS@MNPs within540 min for a 10 mL 60 mg/L of hydrocortisone solution. Experimentally, it was observed that the degradationwas more specific at 254 nm irradiation. The mechanism of degradation was established by scavengingexperiments, density functional theory (DFT) calculations, and liquid chromatography-massspectroscopy analysis of the treated simulated wastewater. Due to the presence of naturally occurringions, the degradation of hydrocortisone by NS@MNPs in the surface water was reduced. FTIR spectra after12th cycle revealed that the coating of NS@MNPs remains unchanged, thus increasing recyclability. NS@MNPs were also proved to be nontoxic towards NIH/3T3 normal cells at micromolar concentrations,demonstrating its vast applicability.

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