Evaluation of the potential of p-nitrophenol degradation in dredged sediment by pulsed discharge plasma

Wang, Tiecheng; Qu, Guangzhou; Sun, Qiuhong; Liang, Dong; Hu, Shibin

doi:10.1016/j.watres.2015.07.022

Cited by 77 publications

(16 citation statements)

References 33 publications

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“…Low‐temperature atmospheric‐pressure plasmas can be used to sustainable degradation of pharmaceutical compounds, improving aerobic respiration of activated sludge, and induce specific biological effects in prokaryotic and eukaryotic cells with high efficiency, which is inherently linked to the rich assortment of highly‐reactive chemical species that are generated as a result of plasma treatment. Species produced in the plasma gas phase are short‐lived and highly‐chemically reactive.…”

Section: Introductionmentioning

confidence: 99%

Quantification of plasma produced OH radical density for water sterilization

Zhang

Zhou

Bazaka

et al. 2018

Plasma Processes & Polymers

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The interactions between plasma-generated excited particles and water play an integral role in sustainable degradation of pharmaceutical compounds, improving aerobic respiration of activated sludge, and efficient removal of microorganisms from water, and are fundamental to the intentional transfer of reactivity from plasmas to biological solutions for such medical applications as cancer treatment and wound healing. The physical and chemical mechanisms that govern this transfer of reactivity are complex, and include concomitant generation and consumption of species in the gas and liquid phases, and at the interface. As such, it is challenging to predict the quantities of biologically-active radicals and molecules in liquid phase from gas phase measurements alone. Rapid and accurate quantification of reactive species, such as OH radicals and H 2 O 2 molecules within the liquid phase and their link to specific biological effects is therefore critical for medical applications of plasmaactivated solutions. Using a simple, low-cost method for trapping and stabilization of OH radicals by means of salicylic acid, this work seeks to provide further insights into the physics and chemistry of generation of OH radicals within the liquid phase, and integrate these findings with decontamination outcomes for four commonly used processing gases.

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Section: Introductionmentioning

confidence: 99%

Quantification of plasma produced OH radical density for water sterilization

Zhang

Zhou

Bazaka

et al. 2018

Plasma Processes & Polymers

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“…The bicarbonate and phosphate compounds present in real water could prevent acidic pHs, which would otherwise disfavor GC degradation (explained in the section “Effects of discharge power and pH”). Normally, the existence of relatively abundant NOM could act as radical scavengers, notably affecting the oxidation rate . However, the presence of Ca 2+ and the generation of Ca(OH) 2 due to CaO 2 addition helped eliminate the influence of the inorganic ions and NOMs by chelation and precipitation .…”

Section: Resultsmentioning

confidence: 99%

Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects

Liu

Wang

Huang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Degradation of glucocorticoids (GCs), including fluocinolone acetonide (FA), triamcinolone acetonide (TA) and clobetasol propionate (CP), in water by dielectric barrier discharge (DBD) and DBD combined with calcium peroxide treatment (DBD/CaO 2 ) were investigated. Effects of discharge power, pH, plasma-working gas and CaO 2 dosage were examined during DBD and DBD/CaO 2 treatments. The synergistic output from the combination of CaO 2 with DBD on •OH concentration, pH, conductivity, CaO 2 adsorption and the overall influence on GC removal were assessed. Toxicity variations and feasibility to various water matrices by DBD and DBD/CaO 2 treatments also were analyzed and compared. RESULTS:The removal efficiencies of FA, TA and CP achieved were 74%, 70% and 75%, respectively, at 36.68 W over 120 min in air with unadjusted pH (energy yield of 7.47 mg kW −1 h −1 ). Significant synergistic effects were observed in combining CaO 2 with DBD with a CaO 2 -concentration-dependent mechanism. The removal efficiency of FA, TA and CP increased by 7%, 32% and 31%, respectively, by DBD/CaO 2 in comparison with DBD alone after 60 min treatments at CaO 2 dosage of 0.4 g L −1 . In addition, DBD/CaO 2 treatment was more effective in controlling toxicity and had better efficacy in various water matrices than DBD alone. CONCLUSION:This study provides a reference point for the application of DBD and DBD/CaO 2 treatments to effectively remove GCs from water.

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“…As a result, 2,4benzoquinone, p-benzoquinone, and 4-nitrocatechol are chiefly formed at the initial stage. Because the -NO 2 group is a leaving group which can be eliminated easily, p-nitrophenol could form the hydroquinone and benzosemiquinone intermediates via the rupture of the C-N bond [40].…”

Section: International Journal Of Photoenergymentioning

confidence: 99%

One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

Sánchez

Chen

Wang

et al. 2019

International Journal of Photoenergy

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Double modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximately 3 times, in comparison to the bare TiO2. The photocatalytic activities of the catalysts were evaluated in the degradation reaction of p-nitrophenol in aqueous solution and basic medium. After 240 min of photodegradation, more than approximately 99% p-nitrophenol could be mineralized with the most active W-TiO2/SiO2 catalyst. Under UV irradiation, p-nitrophenol was initially photodegraded into hydroquinone and benzosemiquinone intermediates, which were further degraded into smaller fragments such as organic carboxylic acids and finally completely mineralized. A proposed photoreaction mechanism was presented based on the key roles of the surface hydroxyl species and superoxide radicals such as O2- and ⋅OH, together with W6+/W5+ couples and e-/h+ pairs in the catalysts in the p-nitrophenol photodegradation. The one-pot sol-gel synthesis method was proven to be effective to obtain W-TiO2/SiO2 catalyst with large surface area and high photocatalytic activity, and it can be also used for the preparation of other heterogeneous catalysts.

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Evaluation of the potential of p-nitrophenol degradation in dredged sediment by pulsed discharge plasma

Cited by 77 publications

References 33 publications

Quantification of plasma produced OH radical density for water sterilization

Quantification of plasma produced OH radical density for water sterilization

Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects

One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

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