Study on the effect of EDTA on the photocatalytic reduction of mercury onto nanocrystalline titania using quartz crystal microbalance and differential pulse voltammetry

Zhou, Jianhong; Deng, Chao; Si, Shihui; Shi, Yun; Zhao, Xueliang

doi:10.1016/j.electacta.2010.11.047

Cited by 46 publications

(20 citation statements)

References 32 publications

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“…To reveal the photocatalytic mechanism further, Figure 8 shows the photodegradation of DON with the addition of hydroxyl radical scavenger (tBuOH) 40 and hole scavenger (EDTA-2Na) 41 under UV light irradiation. As shown in Figure 8, the photocatalytic activity of GZ0.3 decreases largely by the addition of hole scavengers (EDTA-2Na), while reduces slightly with the addition of hydroxyl radical scavengers, indicating that the hydroxyl radical are not the main oxidative species for GZ0.3 samples.…”

Section: Mechanism On Enhancement Of Photocatalytic Activity and Probmentioning

confidence: 99%

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Bai

Sun

Liu

et al. 2017

Applied Catalysis B: Environmental

169

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Water-soluble deoxynivalenol (DON) pose a major threat as a potential organic pollutant to water environmental quality. DON is a toxic secondary metabolite produced by molds of the Fusarium genus and one of the most important mycotoxins in cereal commodities, which can be enriched from the contaminated grain by deoxynivalenol in the process of wet processing. In this work, graphene/ZnO hybrids has been successfully prepared via a simple one-step hydrothermal method and exhibited superior photocatalytic activity for the photodegradation of DON under the irradiation of UV light. The UV light photocatalytic activity of graphene/ZnO hybrid GZ0.3 was 3.1 times than pure ZnO and about 99 % of DON (15 ppm) could be photodegraded within 30 min totally while there were three peaks of intermediate products appeared. The ESI/MS analysis confirmed the presence of DON and degradation product with the secondary mass spectrogram in the positive ESI mode. Overall, this work could provide new insights into the fabrication of graphene/ZnO hybrids composite as high performance photocatalysts and facilitate their application in the mycotoxin detoxification and environmental protection issues.

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Section: Mechanism On Enhancement Of Photocatalytic Activity and Probmentioning

confidence: 99%

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Bai

Sun

Liu

et al. 2017

Applied Catalysis B: Environmental

169

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“…For the purpose of exploring the photocatalysis mechanism of the ternary heterojunction catalyst in depth, the trapping experiments of free radicals and holes were performed to detect the main oxidative species during photocatalytic process of degrading MO. The main oxidative species including hydroxyl radicals (⋅OH), superoxide (⋅O 2 ‐ ) and holes (h + ) could be captured by isopropanol(IPA), 1,4‐benzoquinone(1,4‐BQ), and ethylenediamine tetraacetic acid(EDTA), respectively. Figure D discovered the impact of various scavengers on the visible‐light photocatalytic activity of the optimal catalyst 0.1CdS/HCQD@mpg‐C 3 N 4 toward MO.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Ternary Structure Photocatalyst CdS/CQD@mpg‐C₃N₄ with Enhanced Photocatytic Performance Based on Synergistic Effect

et al. 2018

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Ternary heterostructure composites are promising photocatalysts for degrading organic pollutants in water. In this study, a series of mesoporous carbon nitride (mpg-C 3 N 4 ) decorated with different amounts of carbon quantum dots (CQDs) and cadmium sulfide quantum dots (CdSQDs) were synthesized with a few simple and feasible steps. Under visible-light irradiation, the optimal catalyst resulted in a more than 6.16 times faster reaction rate for methyl orange (MO) photodecomposition than pure mpg-C 3 N 4 and 3.1 times faster than pure cadmium sulfide. The carbon dots and cadmium sulfide quantum dots could be observed on the layers of carbon nitride pore walls through transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The physicochemical properties of selected samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), UV-vis diffuse reflection spectroscopy (DRS), the photoluminescence (PL) and the photocurrent (PC). Probable mechanism of enhanced visible-light photocatalytic activity was investigated. The properties of combined ternary composites, such as high specific surface area of mpg-C 3 N 4, good visible-light harvest ability of CdSQDs and excellent electron storage capacity of CQDs, cooperatively contributed to the final enhancement.[a] Prof.

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“…EDTA has the ability to chelate or complex with almost all heavy metal ions in 1:1 metal-to-EDTA complexes (Zhou et al, 2011;Dipu et al, 2012). This chelating effect greatly increases the solubility of heavy metals in the washing solution and is, therefore, conducive to remove heavy metals from soils There are two major considerations in the selection of chelating agents for soil washing to remove heavy metals: (i) thermodynamically assisted complexation between metals and EDTA; and (ii) EDTA-promoted dissolution (Shahid et al, 2014;Zhang et al, 2010;Luciano et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals (Cu, Cd and Zn) from contaminated soils using EDTA and FeCl3

Bilgin¹

2016

Global NEST Journal

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Environmental pollution caused by heavy metals from different industrial activities constitutes a serious risk for the environment. Soils contaminated with metals, such as Cu, Cd and Zn, are often subjected to physical or chemical remediation procedures to purify soils from these metals. Typical chelating agents used for metal extraction and soil washing generally include ethylene-diaminetetraacetic acid nitrilotriacetic acid, diethylenetriaminepentaacetic acid and citric acid. The subject study evaluating the potential of soil washing methods using EDTA and ferric chloride on two types of soils (coarse grained, fine grained). The effects of operating parameters, such as liquid/solid ratio, soil washing chemicals and washing time were examined. In extraction procedure of Cd (266 mg kg-1), Cu (194 mg kg-1) and Zn (497 mg kg-1) from contaminated coarse grained soil with using 0.01 M FeCl3 washing solution (liquid/solid ratio 20) for 2 hours, contaminants were removed 96.66%, 90.02% and 98.25%, respectively. In extraction procedure of Cd (218 mg kg-1), Cu (153 mg kg-1) and Zn (441.6 mg kg-1) from contaminated fine grained soil with using 0.01 M FeCl3 washing solution (liquid/solid ratio 20) for 2 hours, contaminants were removed 98.18%, 97.48% and 98.05%, respectively. Better removal efficiencies have been obtained by using FeCl3. These results confirmed the effectiveness of the soil-washing method with FeCl3 in remediating heavy metals (Cu, Cd and Zn) from different types of soil.

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Study on the effect of EDTA on the photocatalytic reduction of mercury onto nanocrystalline titania using quartz crystal microbalance and differential pulse voltammetry

Cited by 46 publications

References 32 publications

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Fabrication of Ternary Structure Photocatalyst CdS/CQD@mpg‐C₃N₄ with Enhanced Photocatytic Performance Based on Synergistic Effect

Removal of heavy metals (Cu, Cd and Zn) from contaminated soils using EDTA and FeCl3

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Study on the effect of EDTA on the photocatalytic reduction of mercury onto nanocrystalline titania using quartz crystal microbalance and differential pulse voltammetry

Cited by 46 publications

References 32 publications

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Photocatalytic degradation of deoxynivalenol using graphene/ZnO hybrids in aqueous suspension

Fabrication of Ternary Structure Photocatalyst CdS/CQD@mpg‐C3N4 with Enhanced Photocatytic Performance Based on Synergistic Effect

Removal of heavy metals (Cu, Cd and Zn) from contaminated soils using EDTA and FeCl3

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Fabrication of Ternary Structure Photocatalyst CdS/CQD@mpg‐C₃N₄ with Enhanced Photocatytic Performance Based on Synergistic Effect