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1.
Bioresour Technol ; 408: 131157, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-39059588

RESUMO

The present study successfully synthesized a novel biochar adsorbent (M-L-BC) using litchi seed modified with zinc chloride for PFASs removal in water. M-L-BC greatly enhanced removal of all examined PFASs (>95 %) as compared to the pristine biochar (<40 %). The maximum adsorption capacity was observed for PFOS, reaching 29.6 mg/g. Adsorption kinetics of PFASs followed the pseudo-second-order model (PSO), suggesting the predominance of chemical adsorption. Moreover, characterization and density functional theory (DFT) calculations jointly revealed involvement of surface complexation, electrostatic interactions, hydrogen bonding, and hydrophobic interactions in PFAS adsorption. Robust PFAS removal was demonstrated for M-L-BC across a wide range of pH (3-9), and coexisting ions had limited impact on adsorption of PFASs except PFBA. Furthermore, M-L-BC showed excellent performance in real water samples and retained reusability after five cycles of regeneration. Overall, M-L-BC represents a promising and high-quality adsorbent for efficient and sustainable removal of PFASs from water.


Assuntos
Carvão Vegetal , Cloretos , Litchi , Sementes , Poluentes Químicos da Água , Purificação da Água , Compostos de Zinco , Carvão Vegetal/química , Adsorção , Poluentes Químicos da Água/isolamento & purificação , Sementes/química , Purificação da Água/métodos , Cloretos/química , Compostos de Zinco/química , Litchi/química , Cinética , Concentração de Íons de Hidrogênio , Fluorocarbonos/química , Água/química
2.
Mar Pollut Bull ; 203: 116444, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38705002

RESUMO

An efficient and sensitivity approach, which combines solid-phase extraction or ultrasonic extraction for pretreatment, followed by ultra-performance liquid chromatography-tandem mass spectrometry, has been established to simultaneously determine eight lipophilic phycotoxins and one hydrophilic phycotoxin in seawater, sediment and biota samples. The recoveries and matrix effects of target analytes were in the range of 61.6-117.3 %, 55.7-121.3 %, 57.5-139.9 % and 82.6 %-95.0 %, 85.8-106.8 %, 80.7 %-103.3 % in seawater, sediment, and biota samples, respectively. This established method revealed that seven, six and six phycotoxins were respectively detected in the Beibu Gulf, with concentrations ranging from 0.14 ng/L (okadaic acid, OA) to 26.83 ng/L (domoic acid, DA) in seawater, 0.04 ng/g (gymnodimine-A, GYM-A) to 2.75 ng/g (DA) in sediment and 0.01 ng/g (GYM-A) to 2.64 ng/g (domoic acid) in biota samples. These results suggest that the presented method is applicable for the simultaneous determination of trace marine lipophilic and hydrophilic phycotoxins in real samples.


Assuntos
Biota , Monitoramento Ambiental , Toxinas Marinhas , Água do Mar , Extração em Fase Sólida , Toxinas Marinhas/análise , Monitoramento Ambiental/métodos , Água do Mar/química , Sedimentos Geológicos/química , Poluentes Químicos da Água/análise , Espectrometria de Massas em Tandem , Interações Hidrofóbicas e Hidrofílicas , Ácido Caínico/análogos & derivados , Ácido Caínico/análise , Compostos Heterocíclicos com 3 Anéis , Hidrocarbonetos Cíclicos , Iminas
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