Photocatalytic degradation of 1,4-benzoquinone in aqueous ZnO dispersions

Abdollahi, Yadollah; Abdullah, Abdul Halim; Gaya, Umar Ibrahim; Ahmadzadeh, Saeid; Zakaria, Azmi; Shameli, Kamyar; Zainal, Zulkarnain; Jahangirian, Hossein; Yusof, Nor Azah

doi:10.1590/s0103-50532012000200007

Cited by 45 publications

(11 citation statements)

References 13 publications

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“…This result can be attributed to the influence of the size of the nanoparticles; as the size decreased the effective surface increased, prompting an increase in activity [12][13][14]. The XRD results show that the size of FeZnO was less than that for CuZnO, which was smaller than ZnO.…”

Section: Influence Of Doped Metal Cationsmentioning

confidence: 99%

“…The current interest in ZnO is based on its high spectral response in both UV and visible regions which has been shown to result in much higher efficiency than for TiO 2 for photocatalytic degradation [12]. ZnO photocatalysis has been proposed as an alternative to TiO 2 for the removal of aqueous pollutants, including phenolic compounds [12].…”

Section: Introductionmentioning

confidence: 99%

“…ZnO photocatalysis has been proposed as an alternative to TiO 2 for the removal of aqueous pollutants, including phenolic compounds [12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Visible light photo-degradation of methylene blue over Fe or Cu promoted ZnO nanoparticles

Mardani

Forouzani

Ziari

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Influence Of Doped Metal Cationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Visible light photo-degradation of methylene blue over Fe or Cu promoted ZnO nanoparticles

Mardani

Forouzani

Ziari

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…As such, numerous adsorbents have been developed for removing inorganic contaminants (e.g., heavy metals, arsenic and fluoride) and organic contami-nants (e.g., dyes) from water. On the other hand, to evaluate the removal efficiency of contaminant degradation from aqueous medium, electrochemical sensors as a new approach developed which is relatively cheaper compared to the other common analytical methods such as atomic absorption spectroscopy (AAS), inductively coupled plasma optical emission and mass spectroscopy (ICP-OES and ICP-MS) and ion chromatography (IC) and applied widely as sensitive diagnostic tools recently [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Comparison for adsorption of tetracycline and cefradine using biochar derived from seaweed Sargassum sp.

Song¹,

Guo²,

Li³

et al. 2019

Desalination and Water Treatment

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Surface properties of biochars derived from seaweed Sargassum sp. were observed as obvious difference to those from agricultural wastes. In this study, the adsorptive removal of two types of antibiotics, tetracycline (TC) and cefradine (CF), on the biochar were compared and discussed herein. The rod-like tissues of the raw seaweed swelled to be spindle-like at pyrolytic temperature above 400°C. The carbon content was increased from 22.9% of the raw seaweed to 37.2% of the biocharpyrolyzed at 600°C (BC600), while the oxygen content was just increased slightly from 24.7% to 27.8%. The uptake of both TC and CF on the biochar was found to be pH-dependent. The maximum adsorption capacities of TC and CF calculated from the Langmuir model were 128.1 and 61.7 mg/g, respectively, while more CF molecules were adsorbed on biochar at a low adsorbate concentration. Both the Coulombic interaction and π-π electron-donor-acceptor interaction between seaweed biochar and CF/TC molecules played the predominant roles during the adsorption process. The experimental data was well fitted by the pseudo-second-order kinetics model, indicating a possible chemisorption process to some extent. Isotherm result implied that both surface adsorption and partitioning contributed to the uptake of TC and CF onto BC600.

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“…The species are converted to hydroxyl radicals by further oxidation [16,17]. The AOPs usually use TiO 2 and ZnO as photocatalysts to degrade the organics to CO 2 and H 2 O that are environmental friendly products [15,[18][19][20]. However, the inexpensive ZnO photodegrades a broad range of organic compounds in acidic and basic medium as an excellent alternative for TiO 2 [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Degradation of High Level m‐Cresol by Zinc Oxide as Photocatalyst

Abdollahi

Zakaria

Sairi

2014

CLEAN Soil Air Water

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Research Article Degradation of High Level m-Cresol by Zinc Oxide as PhotocatalystIn this study, the high concentration of m-cresol as a sample of organic pollutants was degraded in the presence of zinc oxide and UV irradiation during 6 h at laboratory scales. The amount of photocatalyst, pH and m-cresol concentration were considered as effective factors on the photodegradation. The demineralization of m-cresol was measured by UV-Vis spectrophotometry while the total organic carbon-analyzer was used to determine the mineralization. The ultrahigh performance LC was used to identify probable intermediates. The results showed optimum condition at pH 7-9, which is the natural pH of industrial wastewater. Moreover, 100% of m-cresol was removed after 5 h of irradiation time, which is quite significant. The detected intermediates were 3,5-hydroxytoluene, 2,5-hydroxy-benzaldehyde, and 3-hydroxybenzaldehyde after 3 h of reaction time. Reusability of the photocatalyst showed insignificant reduction in the photo-catalytic performance. In conclusion, this investigation indicated high potential of zinc oxide suspension to remove high level concentration of m-cresol under UV irradiation. IntroductionAccording to the United Nations World Water Development Report 2012, up to 90% of untreated wastewater is flowing into rivers, lakes and highly productive coastal zones. The hazardous wastewater contains high concentration of phenolic compounds, which must be prevented of entering into the environment [1]. The global attention has been focused on the removal of the compounds from the wastewater using several methods, including biological oxidation systems, electrochemical and adsorption methods [2][3][4][5][6]. The methods are limited by a few drawbacks; the drawback of the biological method is the longer retention time, usually measured in days, to oxidize the organic compounds, the adsorption method cannot mineralize the pollutants and the electrochemical method generates the new toxic intermediates [7][8][9][10]. On the other hand, advanced oxidation processes (AOPs) mineralize the organics to harmless final products using stable and non-toxic photocatalysts, suitable reaction time, appropriate irradiation wavelength at ordinary temperature and atmospheric pressure [11][12][13]. The mineralization is carried out on the photocatalyst surface by hydroxyl radicals (• OH) that are powerful and non-selective to oxide pollutants and probable intermediates [14,15]. The process of the radicals' generation starts when the valence band electrons are excited to the empty conduction band of the photocatalyst by an appropriate irradiation as the source of the energy. The excited electrons are trapped by adsorbed oxygen molecules over the suspension photocatalyst to produce O 2• species.The species are converted to hydroxyl radicals by further oxidation [16,17]. The AOPs usually use TiO 2 and ZnO as photocatalysts to degrade the organics to CO 2 and H 2 O that are environmental friendly products [15,[18][19][20]. However, the inexpensive ZnO...

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Photocatalytic degradation of 1,4-benzoquinone in aqueous ZnO dispersions

Cited by 45 publications

References 13 publications

Visible light photo-degradation of methylene blue over Fe or Cu promoted ZnO nanoparticles

Visible light photo-degradation of methylene blue over Fe or Cu promoted ZnO nanoparticles

Comparison for adsorption of tetracycline and cefradine using biochar derived from seaweed Sargassum sp.

Degradation of High Level m‐Cresol by Zinc Oxide as Photocatalyst

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