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The inherent nature of N/P heteroatoms in Sargassum fusiforme seaweed biochar enhanced the nonradical activation of peroxymonosulfate for acetaminophen degradation in aquatic environments.
- Source :
-
Chemosphere . May2024, Vol. 356, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- This study investigated the catalytic activity of biochar materials derived from algal biomass Sargassum fusiforme (S. fusiforme) for groundwater remediation. A facile single-step pyrolysis process was used to prepare S. fusiforme biochar (SFBC X), where x denotes pyrolysis temperatures (600 °C-900 °C). The surface characterization revealed that SFBC 800 possesses intrinsic N and P heteroatoms. The optimum experimental condition for acetaminophen (AAP) degradation (>98.70%) was achieved in 60 min using 1.0 mM peroxymonosulfate (PMS), 100 mg L−1 SFBC 800 , and pH 5.8 (unadjusted). Moreover, the degradation rate constant (k) was evaluated by the pseudo-first-order kinetic model. The maximum degradation (>98.70%) of AAP was achieved within 60 min of oxidation. Subsequently, the k value was calculated to be 6.7 × 10−2 min−1. The scavenger tests showed that radical and nonradical processes are involved in the SFBC 800 /PMS system. Moreover, the formation of reactive oxygen species (ROS) in the SFBC 800 /PMS system was confirmed using electron spin resonance (ESR) spectroscopy. Intriguingly, both radical (O 2 •−, •OH, and SO 4 •−) and nonradical (1O 2) ROS were formed in the SFBC 800 /PMS system. In addition, electrochemical studies were conducted to verify the electron transfer process of the nonradical mechanism in the SFBC 800 /PMS system. The scavenger and electron spin resonance (ESR) spectroscopy showed that singlet oxygen (1O 2) is the predominant component in AAP degradation. Under optimal condition, the SFBC 800 /PMS system reached ∼81% mineralization of AAP within 5 min and continued to ∼85% achieved over 60 min of oxidation. Coexisting ions and different aqueous matrices were investigated to examine the feasibility of the catalyst system, and the SFBC 800 /PMS system was found to be effective in the remediation of AAP-contaminated groundwater, river water, and effluent water obtained from wastewater treatment plants. Moreover, the SFBC 800 -activated PMS system demonstrated reusability. Our findings indicate that the SFBC 800 catalyst has excellent catalytic activity for AAP degradation in aquatic environments. [Display omitted] • PMS-activated Sargassum fusiforme biochar (SFBC 800) boosts acetaminophen breakdown. • Inherent N and P in SFBC 800 enhance the AAP degradation pathway. • Singlet oxygen (1O 2) is the dominant component in the SFBC 800 /PMS system. • SFBC 800 demonstrated reusability in groundwater, surface water, and wastewater. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00456535
- Volume :
- 356
- Database :
- Academic Search Index
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 176868335
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2024.141877