Journal
CHEMOSPHERE
Volume 287, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132174
Keywords
NaBiS2; Visible light; Photodegradation; 2,4-DCP; Kinetics
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Funding
- Science and Engineering Research Board, Govt. of India under the ASEAN-India Collaborative R&D Scheme of the ASEAN India S&T Development Fund (AISTDF) [CRD/2018/000066]
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The study successfully used NaBiS2 as a photocatalyst to degrade 2,4-dichlorophenol in water, demonstrating its high stability, abundant surface-active sites, and efficient adsorption and catalytic activity. NaBiS2 showed promising properties such as non-toxicity and antifungal activity, making it a potential material for industrial and environmental applications.
Removal of the hazardous and endocrine-disrupting 2,4-dichlorophenol (2,4-DCP) from water bodies is crucial to maintain the sanctity of the ecosystem. As a low bandgap material (1.37 eV), NaBiS2 was hydrothermally prepared and used as a potential photocatalyst to degrade 2,4-DCP under visible light irradiation. NaBiS2 appeared to be highly stable and remained structurally undeterred despite thermal variations. With a surface area of 6.69 m(2)/g, NaBiS2 has enough surface-active sites to adsorb the reactive molecules and exhibit a significant photo catalytic activity. In alkaline pH, the adsorption of 2,4-DCP on NaBiS2 appeared to decrease whereas, the acidic and neutral environments favoured the degradation. An increase in the photocatalyst dosage enhanced the degradation efficiency from 81 to 86 %, because of higher vacant adsorbent sites and the electrostatic attraction between NaBiS2 and 2,4-DCP. The dominant scavengers degraded 2,4-DCP by forming a coordination bond between chlorine's lone pair of electrons and the vacant orbitals of bismuth, following the order hole> center dot OH > singlet oxygen. Being non-toxic to both natural and aquatic systems, NaBiS2 exhibits antifungal properties at higher concentrations. Finally, the electron-rich NaBiS2 is an excellent electrocatalyst that effectively degrades organic pollutants and is a promising material for industrial and environmental applications.
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