Augmented photocatalytic degradation of Acetaminophen using hydrothermally treated g-C 3 N 4 and persulfate under LED irradiation.

Autor: Gupta S; Energy and Environmental Chemistry Laboratory, Department of Chemistry, Birla Institute of Technology and Science, Pilani, K K Birla Goa Campus, NH17B, Zuarinagar, Goa, 403726, India., Gandhi J; Energy and Environmental Chemistry Laboratory, Department of Chemistry, Birla Institute of Technology and Science, Pilani, K K Birla Goa Campus, NH17B, Zuarinagar, Goa, 403726, India., Kokate S; Energy and Environmental Chemistry Laboratory, Department of Chemistry, Birla Institute of Technology and Science, Pilani, K K Birla Goa Campus, NH17B, Zuarinagar, Goa, 403726, India.; Aditya Birla Science & Technology Co. Pvt. Ltd., Taloja, Mumbai, 410208, India., Raikar LG; Energy and Environmental Chemistry Laboratory, Department of Chemistry, Birla Institute of Technology and Science, Pilani, K K Birla Goa Campus, NH17B, Zuarinagar, Goa, 403726, India., Kopuri VG; Kwality Photonics Pvt. Ltd., Kushaiguda, Hyderabad, 500062, India., Prakash H; Energy and Environmental Chemistry Laboratory, Department of Chemistry, Birla Institute of Technology and Science, Pilani, K K Birla Goa Campus, NH17B, Zuarinagar, Goa, 403726, India.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2023 May 19; Vol. 9 (5), pp. e16450. Date of Electronic Publication: 2023 May 19 (Print Publication: 2023).
DOI: 10.1016/j.heliyon.2023.e16450
Abstrakt: Photocatalytic degradation of organic pollutants in water using graphitic carbon nitride and persulfate under visible light (g-C 3 N 4 /PS system) has been studied. Here, we demonstrate augmentation of photocatalytic degradation of Acetaminophen (AAP) using hydrothermally treated g-C 3 N 4 and PS under 400 nm LED irradiation (HT-g-C 3 N 4 /PS system). A pseudo-first-order rate constant (k obs, 0.328 min -1 ) for degradation of AAP using HT-g-C 3 N 4 /PS system was determined to be 15 times higher compared to g-C 3 N 4 /PS system (k obs, 0.022 min -1 ). HT-g-C 3 N 4 showed a higher surface area (81 m 2 /g) than g-C 3 N 4 (21 m 2 /g). Photocurrent response for HT-g-C 3 N 4 was higher (1.5 times) than g-C 3 N 4 . Moreover, Nyquist plot semicircle for HT-g-C 3 N 4 was smaller compared to g-C 3 N 4 . These results confirm effective photoelectron-hole separation and charge-transfer in HT-g-C 3 N 4 compared to g-C 3 N 4 . AAP degradation using HT-g-C 3 N 4 /PS system was significantly inhibited with O 2 . - and h + scavengers compared to 1 O 2, S O 4 . - and H O . scavengers. ESR results revealed O 2 . - formation in HT-g-C 3 N 4 /PS system. Moreover, photocurrent measurements reveal AAP oxidation by h + of HT-g-C 3 N 4 was effective than g-C 3 N 4 . HT-g-C 3 N 4 was reused for five cycles in HT-g-C 3 N 4 /PS system. Augmented photocatalytic degradation of AAP by HT-g-C 3 N 4 /PS system compared to g-C 3 N 4 /PS is attributed to effective photoelectron hole separation of HT-g-C 3 N 4 that generates O 2 . - and h + for oxidation of pollutant. Importantly, electrical energy per order (E EO ) was 7.2 kWh m -3 order -1 . k obs for degradation of AAP in simulated groundwater and tap water were determined as 0.029 and 0.035 min -1 , respectively. Degradation intermediates of AAP were proposed. AAP ecotoxicity against marine bacteria Aliivibrio fischeri was completely removed after treatment by HT-g-C 3 N 4 /PS system.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2023 The Authors. Published by Elsevier Ltd.)
Databáze: MEDLINE
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