Publications by authors named "Leliang Wu"
Currently, iron-catalyzed low-valent sulfur species processes are regarded as potentially valuable advanced oxidation processes (AOPs) in wastewater treatment. As a commonly used low-valent sulfur species in the food industry, metabisulfite (MBS) can undergo decomposition to bisulfite when dissolved in water. Therefore, the combination of MBS with dissolved Fe(III) at environmentally relevant concentrations is proposed in this study to accelerate organic contaminants degradation while simultaneously minimizing the production of iron sludge.
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- Peracetic acid (PAA) based Fenton processes are gaining interest for water treatment but face challenges due to inefficient Fe redox cycles.
- Incorporating L-cysteine (L-Cys) significantly improves sulfamethoxazole (SMX) degradation rates and shifts the reaction pathway from a nonradical to a radical mechanism by enhancing iron solubilization.
- The study reveals that while L-Cys boosts SMX removal, excessive amounts or high pH can hinder effectiveness, providing critical insights for improving antibiotic treatment in water systems.
Hydrogen sulfite promoted the activation of persulfate by μM Fe for bisphenol A degradation.
Environ Sci Pollut Res Int
December 2022
Article Synopsis
- * The main reactive species responsible for degrading BPA in this system were sulfate radicals and singlet oxygen, with various operational factors like reagent dosage and pH influencing the removal efficiency.
- * The method was also tested in different water types, achieving notable BPA removal rates in domestic and natural waters, along with the ability to eliminate other organic contaminants, suggesting the Fe/HS/PS system is a promising solution for treating polluted water.
Article Synopsis
- * BPS degradation was very efficient, achieving complete removal within 240 minutes, with the process influenced by factors like Ca(OH), PMS, BPS concentrations, pH, temperature, as well as the presence of other substances; analysis showed that singlet oxygen and superoxide radicals were key reactive species.
- * The
Article Synopsis
- High levels of pharmaceuticals in urine create a need for effective degradation methods before they enter the environment, prompting research into using peroxymonosulfate (PMS) for this purpose.
- The study found that PMS can efficiently degrade acetaminophen in hydrolyzed urine, primarily through singlet oxygen as the main reactive species, while other urine components either had little effect or enhanced the degradation process.
- Photo-irradiation improved degradation efficiency, and the research identified nine intermediate products and proposed degradation pathways for acetaminophen, confirming PMS as a potent oxidant for treating contaminants in urine.
Article Synopsis
- - Peroxymonosulfate (PMS) was used for the first time to treat soil contaminated with the antibiotic sulfathiazole (STZ), achieving a 96.54% degradation of STZ within 60 minutes at a concentration of 4 mM PMS.
- - The study found that singlet oxygen was the main reactive agent in breaking down STZ, while certain substances like Cl and Fe improved degradation efficiency, though high levels of HCO and Mn hindered it.
- - Results indicated that PMS treatment not only reduced STZ toxicity, improving the growth of wheat and radish, but also had minimal effects on soil structure and heavy metal concentrations, suggesting it is a safe and effective method for soil remediation.
Minute Cu coupling with HCO for efficient degradation of acetaminophen via HO activation.
Ecotoxicol Environ Saf
September 2021
Homogeneous Cu-mediated activation of HO has been widely applied for the removal of organic contaminants, but fairly high dosage of Cu is generally required and may cause secondary pollution. In the present study, minute Cu (2.5 μM) catalyzed HO exhibited excellent efficiency in degradation of organic pollutants with the assistant of naturally occurring level HCO (1 mM).
View Article and Find Full Text PDFIn this study, a favorable CO/PMS system for efficient degradation of organic contaminants (acid orange 7 (AO7), acetaminophen, para-aminobenzoic acid, phenol, methylene orange, methylene blue) in water was firstly reported. Under optimal conditions, the decolorization ration of AO7 was 100% within 40 min. Data fitting showed that the AO7 decolorization could be described by the pseudo-first-order kinetics, and the rates constant values ranging from 0.
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