Fe3O4@BNPs@ZnO–ZnS as a novel, reusable and efficient photocatalyst for dye removal from synthetic and textile wastewaters

Khodamorady, Minoo; Bahrami, Kiumars

doi:10.1016/j.heliyon.2023.e16397

“… 24 , 25 Meanwhile, the presence of ZnS in PEO nanofibers was indicated by the Zn-S stretching vibration peak at 610 cm –1 . 26 Furthermore, the stretching vibration peak of Zn(O,S) was found at 554 cm –1 in between those of ZnO and ZnS peaks.…”

Section: Resultsmentioning

confidence: 93%

“…In the FTIR spectrum of PEO, the peaks at 3441 and 2883 cm –1 referred to the functional groups of stretching -OH and CH sp 3 , respectively . The organic functionality peaks of bending CH 2 , stretching C–O–C, bending C–H, and stretching C–C were located at 1445, 1106, 958, and 849 cm –1 , respectively. , In the presence of ZnO in PEO nanofibers, there was an additional peak observed at a wavelength of 438 cm –1 corresponding to the stretching vibration of Zn–O. , Meanwhile, the presence of ZnS in PEO nanofibers was indicated by the Zn-S stretching vibration peak at 610 cm –1 . Furthermore, the stretching vibration peak of Zn(O,S) was found at 554 cm –1 in between those of ZnO and ZnS peaks.…”

Section: Resultsmentioning

confidence: 98%

Electrospun Nanofiber Mats with Embedded Zinc Oxysulfide for Photoreduction of Nitrobenzene to Aniline under Mild Condition

Sitinjak,

Masmur,

Hutajulu

et al. 2023

ACS Omega

3

0

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In this work, electrospun nanofiber embedded with zinc oxysulfide (Zn(O,S)) has been demonstrated as an efficient and robust photocatalyst for hydrogenation of nitrobenzene to aniline under solar light irradiation at mild conditions with methanol as the hole scavenger. The solid solution state of Zn(O,S) in electrospun nanofiber was successfully revealed by high-resolution transmission electron microscopy and X-ray diffraction analyses in which the lattice fringes and diffraction planes located in between those of ZnO and ZnS phases. Moreover, the electrochemical and optical properties of Zn(O,S) embedded in polyethylene oxide (PEO) nanofiber are found to be better than those of ZnO and ZnS indicating more efficient photocatalytic activities as well. The photocatalytic hydrogenation of nitrobenzene to aniline occurred completely within 2 h of the photocatalytic reaction with a reusability of 95% after five consecutive runs. Finally, the mechanism of photocatalytic hydrogenation by Zn(O,S) embedded in the PEO (PZOS) nanofiber involves a total of six electrons (e–) and six protons (H+) to hydrogenate nitrobenzene to nitrosobenzene, phenylhydroxylamine, and aniline.

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“…Hydrogen generated in electrochemical oxidation is still a safe issue, which requires further safety protection measures or treatment methods. Most of photocatalytic oxidations required the introduction of photocatalysts, which increase the cost of the wastewater treatment [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Reactive Red (B-3BF) Dye Wastewater Using UV Irradiation (254/185nm) with Sodium Persulfate in a Pilot UV Device

Wang,

Li,

Wan

et al. 2024

Preprint

0

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Two low-pressure ultraviolet (UV) lamps at 185/254 nm with sodium persulfate in a pilot UV device were utilized for the degradation of reactive red (B-3BF) dye wastewater compared with two UV lamps at 185/185 nm and two UV lamps at 254/254 nm. The degradation performances of UV irradiation (254/185 nm) with sodium persulfate under different degradation times, flow rates, initial pH, initial Na2S2O8 concentrations and initial dye concentrations were investigated. The experimental results illustrated that the degradation percentage of B-3BF dye could reduce to 90.42% with the energy consumption of 85.1 kWh/kg and the residual dye concentration of 1.92 mg/L by UV irradiation (254/185 nm) with initial Na2S2O8 concentration of 1.5 mmol/L and initial dye concentration of 20 mg/L. In addition, degradation performance of B-3BF dye wastewater by UV irradiation (254/185 nm) with sodium persulfate was more effective than those of UV irradiation (254/254 nm) and UV irradiation (185/185 nm). Therefore UV irradiation (254/185 nm) with sodium persulfate was promising for the degradation of B-3BF dye wastewater.

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“…Hydrogen generated in electrochemical oxidation is still a safe issue, which requires further safety protection measures or treatment methods. Most of photocatalytic oxidations required the introduction of photocatalysts, which increase the cost of the wastewater treatment 5 – 7 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of reactive red (B-3BF) dye wastewater using UV irradiation (254/185 nm) with sodium persulfate in a pilot UV device

Wang,

Li,

Wan

et al. 2024

Sci Rep

0

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Two low-pressure ultraviolet (UV) lamps at 185/254 nm with sodium persulfate in a pilot UV device were utilized for the degradation of reactive red (B-3BF) dye wastewater compared with two UV lamps at 185/185 nm and two UV lamps at 254/254 nm. The degradation performances of UV irradiation (254/185 nm) with sodium persulfate under different degradation times, flow rates, initial pH, initial Na2S2O8 concentrations and initial dye concentrations were investigated. The experimental results illustrated that the degradation percentage of B-3BF dye could reduce to 90.42% with the energy consumption of 85.1 kWh/kg and the residual dye concentration of 1.92 mg/L by UV irradiation (254/185 nm) with initial Na2S2O8 concentration of 1.5 mmol/L and initial dye concentration of 20 mg/L. In addition, degradation performance of B-3BF dye wastewater by UV irradiation (254/185 nm) with sodium persulfate was more effective than those of UV irradiation (254/254 nm) and UV irradiation (185/185 nm). Therefore UV irradiation (254/185 nm) with sodium persulfate was promising for the degradation of B-3BF dye wastewater.

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Fe3O4@BNPs@ZnO–ZnS as a novel, reusable and efficient photocatalyst for dye removal from synthetic and textile wastewaters

Cited by 13 publications

References 85 publications

Electrospun Nanofiber Mats with Embedded Zinc Oxysulfide for Photoreduction of Nitrobenzene to Aniline under Mild Condition

Electrospun Nanofiber Mats with Embedded Zinc Oxysulfide for Photoreduction of Nitrobenzene to Aniline under Mild Condition

Degradation of Reactive Red (B-3BF) Dye Wastewater Using UV Irradiation (254/185nm) with Sodium Persulfate in a Pilot UV Device

Degradation of reactive red (B-3BF) dye wastewater using UV irradiation (254/185 nm) with sodium persulfate in a pilot UV device

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