Green valorization of end-of-life toner powder to iron oxide-nanographene nanohybrid as a recyclable persulfate activator for degrading emerging micropollutants

Samy, Mahmoud; Mensah, Kenneth; El‐Fakharany, Esmail M.; Elkady, M.F.; Shokry, Hassan

doi:10.1016/j.envres.2023.115460

Cited by 26 publications

(7 citation statements)

References 65 publications

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“…FTIR spectra were recorded between 4000 and 400 cm −1 with a spectral resolution of 4 cm −1 . The models of the aforementioned equipment were mentioned in our previous studies (Samy et al 2023b , a ).…”

Section: Methodsmentioning

confidence: 99%

“…The mass loss ratios were 1.38% and 0.97% in the case of microplastics with 3 mm × 3 mm and 5 mm × 5 mm, respectively indicating that the increase of plastic’s size could decrease the degradation rate. Herein, an efficient photocatalyst (sulfur-doped TiO 2 (S-TiO 2 )) that was previously employed in our previous studies for the degradation of emerging pollutants such as trimethoprim and 2,4-dichlorophenol was utilized for the degradation of polyethylene bags (Samy et al 2023b , a ). Doping with sulfur reduced the bandgap to 2.85 eV which improved the absorption in the visible light region as well as sulfur ions could trap electrons inhibiting the recombination between charge carriers, thereby enhancing the photocatalytic performance and the generation of reactive species.…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

Sharara,

Samy,

Mossad

et al. 2023

Environ Sci Pollut Res

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Given the immense threats of microplastics, we herein investigate photodegrading the debris of polyethylene bags (PBs) by sulfur-doped titanium dioxide. The optimization of operating parameters showed that controlling the water pH at 3 and introducing PBs by 0.10 g/L under a catalyst dose of 1.25 g/L reduced the polyethylene mass by 3.10% in 7 h, whereas raising the catalyst dose to 3 g/L improved the mass reduction to 4.72%. The extension of degradation time to 100 h at pH 3, catalyst dosage of 3 g/L, and PBs concentration of 0.10 g/L increased the mass loss ratio to 21.74%. Scanning electron microscopy of PBs after 100 h of photodegradation showed cracks on the surface accompanied by the increase of carbonyl index from 0.52 to 1.41 confirming the breakdown of the polymeric chain. Total organic carbon increased from 0.80 to 7.76 mg/L in the first 10 h of photodegradation, then decreased to 1 mg/L after extending the reaction time to 100 h due to the mineralization of organic intermediates generated from the photodegradation of PBs. Trapping tests exhibited the major role of hydroxyl radicals in the degradation system, and the catalyst showed high stability under five repetitive runs. This study proposes an efficient treatment system that can be implemented on a wider scale utilizing the synthesized catalyst to degrade plastics efficiently before their release to water streams.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

Sharara,

Samy,

Mossad

et al. 2023

Environ Sci Pollut Res

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“…Due to the lower cost and ease practical application, researchers have paid much attention to find visible light photocatalysts 12 . Bismuth vanadate (BiVO 4 ) as an emerging compound has attracted a lot of attention due to its outstanding properties, including low band gap, good dispensability, non-toxicity, optical corrosion resistance and remarkable photocatalytic efficiency in the decomposition of organic pollutants under visible light 12 – 16 . Studies on the monoclinic BiVO 4 (m-BiVO 4 ) have shown that its band gap energy is 2.4EV, which can be activated under visible light, and as a visible-light absorbing photocatalyst it can be used for organic pollutants degradation and wastewater treatment 12 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of 2,4-dinitrotoluene in aqueous solution by dielectric barrier discharge plasma combined with Fe–RGO–BiVO4 nanocomposite

Vaziri,

Asgari,

Ghorbani-Shahna

et al. 2024

Sci Rep

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Abstract2,4-Dinitrotoluene (2,4-DNT) as a priority and hazardous pollutant, is widely used in industrial and military activities. In this study the synergistic effect of Fe–RGO–BiVO4 nanocomposite in a non-thermal dielectric barrier discharge plasma reactor (NTP-DBD) for degrading 2,4-DNT was evaluated. Preparation of the Fe–RGO–BiVO4 nanocomposite was done by a stepwise chemical method depositing Fe and reduced graphene oxide (RGO) on BiVO4. Field emission scanning electron microscopy (FESEM), X-ray diffraction analysis (XRD), UV–vis diffuse reflectance spectra (DRS), and energy-dispersive X-ray spectroscopy mapping (EDS-mapping) validated the satisfactory synthesis of Fe–RGO–BiVO4. To find the optimal conditions and to determine the interaction of model parameters, a central composite design (RSM-CCD) had been employed. 2,4 DNT can be completely degraded at: initial 2,4-DNT concentration of 40 mg L−1, Fe–RGO–BiVO4 dosage of 0.75 g L−1, applied voltage of 21kV, reaction time of 30 min and pH equal to 7, while the single plasma process reached a degradation efficiency of 67%. The removal efficiency of chemical oxygen demand (COD) and total organic carbon (TOC) were 90.62% and 88.02% at 30 min contact time, respectively. Results also indicated that average oxidation state (AOS) and carbon oxidation state (COS) were enhanced in the catalytic NTP-DBD process, which demonstrate the effectiveness of proposed process for facilitating biodegradability of 2,4-DNT.

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“…A recent study 4 prepared NM/ZnO/AC nanohybrid by combining zinc oxide (ZnO), activated carbon (AC) derived from water hyacinth, and nano‐magnetite (NM), which can activate the persulphate to remove 92.8% carbofuran. In addition, persulphate can be activated by biochar 5 and chemical wastes (e.g., expired drugs 6 and toner wastes 7 ), lowering wastewater treatment costs. The radicals play a major role in most persulphate‐based AOPs 8 .…”

Section: Introductionmentioning

confidence: 99%

Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater

Wu,

Zhang,

Fan

et al. 2023

Coloration Technology

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Coordination complexes were widely used in advanced oxidation processes. The ligands with various substituents could lead to differences in the catalytic properties and mechanisms. In this work, the iron(III)‐N, N′‐dipicolinamide (FeL) complexes (the iron(III) complexes with substituents ‐CH3, ‐H, ‐Cl and ‐NO2 named as FeL1, FeL2, FeL3 and FeL4, respectively) were used to activate H2O2 for degrading dyes wastewater. Mechanism studies indicated that the FeL4/H2O2 system contains the FeV=O in addition to the same •OH and O2•‐ as the other systems, which made it exhibit more excellent performance than others. The results of the performance tests showed that the FeL4/H2O2 system could remove 97%, 89%, 100%, 83%, 100%, and 99% of RR195, RY145, RB194, RB19, MB, and RhB, respectively, which proved the good application performance of the FeL4/H2O2 system. In addition, the performance of the FeL4/H2O2 system was not influenced by anions and natural organics. This study verified the feasibility of modulating the catalytic performance of the complexes by changing the substituents and provided an efficient catalytic system for dyeing wastewater treatment.This article is protected by copyright. All rights reserved.

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Green valorization of end-of-life toner powder to iron oxide-nanographene nanohybrid as a recyclable persulfate activator for degrading emerging micropollutants

Cited by 26 publications

References 65 publications

Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

Degradation of 2,4-dinitrotoluene in aqueous solution by dielectric barrier discharge plasma combined with Fe–RGO–BiVO4 nanocomposite

Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater

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