Journal
CHEMOSPHERE
Volume 300, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134594
Keywords
TiO2/NiCr2O4; Persulfate-assisted degradation; p-n heterojunction; Tetracycline hydrochloride
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Funding
- University of Mohaghegh Ardabili, Iran
- RUDN University Strategic Academic Leadership Program
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TiO2/NiCr2O4 nanocomposites with p-n heterojunctions were synthesized and used with peroxydisulfate to efficiently degrade tetracycline hydrochloride. The properties of the materials were extensively investigated, and a possible degradation mechanism was proposed.
Herein, TiO2/NiCr2O4 nanocomposites with p-n heterojunctions were synthesized via a refluxing method and used with peroxydisulfate (PDS) to produce extensive reactive radicals. Textural, optical, photoelectrochemical, structural, and morphological properties of the prepared materials were extensively investigated. After adding 1.48 mM PDS, the removal rate constant of tetracycline hydrochloride (TH) over the TiO2/NiCr2O4 (20%)/PDS system was almost 20.5, 7.24, and 5.91-times as high as the pristine TiO2, TiO2/PDS, and TiO2/NiCr2O4 (20%) samples, respectively. Therefore, the synergistic effect of PDS and heterogeneous photocatalysis remarkably impacted the degradation reaction of TH. It was proposed that all h(+), O-center dot(2)-, (OH)-O-center dot, and SO4 center dot- contributed to the degradation reaction. According to the formation of heterojunction between n-TiO2, and p-NiCr2O4 semiconductors, a plausible mechanism for removal of different contaminants in the TiO2/NiCr2O4/PDS system was discussed.
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