Enhanced photocatalytic degradation of rhodamine B dye and antibacterial activity of diatomite-supported TiO2/ZnS hybrid catalyst via additional calcination.

Autor: Benzelmat, Lamia Ahlem, Bernaoui, Cheikh Reda, Hadjel, Mohammed, Djediai, Houria, Cherrak, Rachida, Goual, Nor El Houda, Alaoui, Chakib, Karkachi, Noureddine, Benhamed, Amine, Taibi, Zohra
Zdroj: Reaction Kinetics, Mechanisms & Catalysis; Aug2024, Vol. 137 Issue 4, p2451-2468, 18p
Abstrakt: The current investigation introduces a novel diatomite-TiO2/ZnS photocatalyst tailored to address the challenges posed by organic dye pollution while concurrently providing antibacterial activity. The methodology commences with diatomite purification, followed by the deposition of nanoparticles forming a heterojunction system between ZnS and TiO2 on the diatomite surface, culminating in the development of the nanocomposite. Notably, the optical absorption edge of the diatomite-TiO2/ZnS nanocomposite resides within the UV light spectrum. Subsequent heat treatment at 500 °C heightens the system's responsiveness to UV radiation. The nanocomposite exhibits exceptional efficacy in the photocatalytic degradation of rhodamine B dye. The optimal catalyst, DTZS 500, achieves a remarkable 98% degradation of rhodamine B within 180 min, boasting a pseudo-first-order constant of 0.03299 min−1, which is twice that of P25. Furthermore, nearly complete mineralization of organic matter is evidenced by chemical oxygen demand (COD) measurements. These superior performances are ascribed to the well-dispersed TiO2 and ZnS on the diatomite surface, the adsorption properties of diatomite, and the effective separation of photo-generated electron–hole pairs facilitated by the formation of a heterojunction system between TiO2 and ZnS. Moreover, the nanocomposite exhibits notable antibacterial effects against S. aureus, as evidenced by substantial inhibition zones measuring 38 mm in diameter. This study thus presents a promising avenue towards the provision of highly efficient and economical solutions for water treatment, encompassing both photocatalysis and bacterial disinfection. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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