Enhanced Activation of Persulfate by Meso-CoFe2O4/SiO2 with Ultrasonic Treatment for Degradation of Chlorpyrifos

Xie, Huanling; Xu, Wei

doi:10.1021/acsomega.9b01626

Cited by 21 publications

(5 citation statements)

References 51 publications

(80 reference statements)

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“…All products except P4 have been detected by HPLC-TOF-MS/MS in the combination of microwave and persulfate [27]. By comparing the energy barriers of these three pathways, the cleavage of the P 1 =O 21 bond was the most favorable, making it the optimal pathway, which was consistent with the experimental detection of a significant amount of P1 [26,27].…”

Section: Subsequent Reactions Of Im1-1(oh)supporting

confidence: 76%

“…•− and •OH have strong oxidation effect on CPY degradation [25]. Xie et al found that CPY presents a rapid removal rate and almost completely degraded with the ultrasoundactivated persulfate process [26]. This study proposed that the removal mechanism of CPY could be divided into two possible degradation pathways.…”

Section: Introductionmentioning

confidence: 88%

“…Shah et al prepared Fe-ZnO using the sol-gel method and used it in activating the persulfate process; results demonstrated that the generation of high concentrations of SO 4 •− and ·OH have strong oxidation effect on CPY degradation [ 25 ]. Xie et al found that CPY presents a rapid removal rate and almost completely degraded with the ultrasound-activated persulfate process [ 26 ]. This study proposed that the removal mechanism of CPY could be divided into two possible degradation pathways.…”

Section: Introductionmentioning

confidence: 99%

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Persulfate–Based Advanced Oxidation Process for Chlorpyrifos Degradation: Mechanism, Kinetics, and Toxicity Assessment

Xu,

Zhang,

Zou

et al. 2024

Toxics

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Persulfate-based advanced oxidation process has been proven to be a promising method for the toxic pesticide chlorpyrifos (CPY) degradation in wastewater treatment. However, due to the limitation for the short-lived intermediates detection, a comprehensive understanding for the degradation pathway remains unclear. To address this issue, density functional theory was used to analyze the degradation mechanism of CPY at the M06-2X/6-311++G(3df,3pd)//M06-2X/6-31+G(d,p) level, and computational toxicology methods were employed to explore the toxicity of CPY and its degradation products. Results show that hydroxyl radicals (·OH) and sulfate radicals (SO4•−) initiate the degradation reactions by adding to the P=S bond and abstracting the H atom on the ethyl group, rather than undergoing α-elimination of the pyridine ring in the persulfate oxidation process. Moreover, the addition products were attracted and degraded by breaking the P–O bond, while the abstraction products were degraded through dealkylation reactions. The transformation products, including 3,5,6-trichloro-2-pyridynol, O,O-diethyl phosphorothioate, chlorpyrifos oxon, and acetaldehyde, obtained through theoretical calculations have been detected in previous experimental studies. The reaction rate constants of CPY with ·OH and SO4•− were 6.32 × 108 and 9.14 × 108 M−1·s−1 at room temperature, respectively, which was consistent with the experimental values of 4.42 × 109 and 4.5 × 109 M−1 s−1. Toxicity evaluation results indicated that the acute and chronic toxicity to aquatic organisms gradually decreased during the degradation process. However, some products still possess toxic or highly toxic levels, which may pose risks to human health. These research findings contribute to understanding the transformation behavior and risk assessment of CPY in practical wastewater treatment.

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Section: Subsequent Reactions Of Im1-1(oh)supporting

confidence: 76%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Persulfate–Based Advanced Oxidation Process for Chlorpyrifos Degradation: Mechanism, Kinetics, and Toxicity Assessment

Xu,

Zhang,

Zou

et al. 2024

Toxics

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“…•− ), 16,17 ( • OH), 18,19 and (O 2 •− ), 20,21 •− is typically generated from persulfate (PS, S 2 O 8 2− ). Due to the excellent stability of PS, it can be activated in various ways, including heat, 12 microwave irradiation, 15,22 ultrasonication, 23 and transition metals. 24 Meanwhile, PS stably exists in the matrixes until it is activated for in situ chemical oxidation.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Shen

Zhang

et al. 2021

ACS Omega

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Since traditional methods for removing volatile organic compounds (VOCs) from wood consume large amounts of energy and generate environmental pollution, it is desired to develop a convenient and green treatment method. Oxidation by microwave-activated persulfate (MW-PS) is a promising alternative method that has been used to eliminate VOCs from wood. The penetration of microwave energy can destroy the wood pit membranes and increase VOC emissions. The VOCs are further degraded by •OH and SO 4•− , which are generated via the activation of microwaves. This phenomenon can be detected by the electron paramagnetic resonance spectrometry. The 35 types of main VOCs of natural wood were determined, including alkanes/ terpenes, alcohols/ethers, esters, aldehydes/ketones, and others. In the MW-PS system, 23 compounds were removed with an efficiency of 100%. Specifically, as one of the major compounds, the content of alkanes/terpenes was sharply decreased, and no alcohols/ethers and esters were detected. It was found that the optimal conditions of the MW-PS system for the minimum release of VOCs from wood were the microwave power of 462 W, irradiation time of 30 min, and PS dosage of 0.5 mmol/L.

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“…Check for updates chlorpyrifos with 99.9% [13], while CoFe2O4-rGO was used for methylene blue, methyl orange, and rhodamine B dyes with an efficiency of 89%, 64%, and 58%, respectively [14].…”

mentioning

confidence: 99%

Preparation of CoFe2O4/SiO2/Ag Magnetic Composite as Photocatalyst for Congo Red Dye and Antibacterial Potential

et al. 2022

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This research reports the synthesized CoFe2O4/SiO2/Ag magnetic composite used as a photocatalyst to degrade Congo red dye and antibacterial agent against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). The catalysts were characterized using XRD, SEM-EDS, VSM, UV-DRS, and pHpzc. The effects of photocatalyst dose (0.25, 0.5, 0.75, and 1.0 g/L), dye concentration (10, 20, 30, and 40 mg/L), and irradiation time (0–210 minutes) were all examined as photocatalytic degradation variables. The results showed that the CoFe2O4/SiO2/Ag composite was superparamagnetic with a saturation magnetization of 41.82 emu/g and had a band gap of 1.82 eV. The highest efficiency of decreasing the concentration of Congo red dye of 93.70% was obtained with an initial concentration of 10 mg/L, a catalyst dose of 0.5 g/L, and an irradiation time of 180 minutes. This study indicated that the composite had antibacterial properties against Gram-positive (S. aureus) and Gram-negative (E. coli) bacteria with the same MIC value of 1.25%. These results indicated that the CoFe2O4/SiO2/Ag composite has significant potential for applications in wastewater treatment.

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Enhanced Activation of Persulfate by Meso-CoFe₂O₄/SiO₂ with Ultrasonic Treatment for Degradation of Chlorpyrifos

Cited by 21 publications

References 51 publications

Persulfate–Based Advanced Oxidation Process for Chlorpyrifos Degradation: Mechanism, Kinetics, and Toxicity Assessment

Persulfate–Based Advanced Oxidation Process for Chlorpyrifos Degradation: Mechanism, Kinetics, and Toxicity Assessment

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Preparation of CoFe2O4/SiO2/Ag Magnetic Composite as Photocatalyst for Congo Red Dye and Antibacterial Potential

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