Preparation of nano N-TiO2/graphene oxide/titan grid sheets for visible light assisted photocatalytic ozonation of cefixime

Sheydaei, Mohsen; Shiadeh, Hamid Reza Karbor; Ayoubi-Feiz, Baharak; Ezzati, Ramin

doi:10.1016/j.cej.2018.07.089

Cited by 81 publications

(24 citation statements)

References 34 publications

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“…While photocatalysis effectiveness is increased when UV light is utilized, numerous materials have been shown to be capable of visible light photodegradation of pharmaceuticals. 109,114,[116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131][132][133][134] Although power utilization of many visible light lamps is equivalent to that of low-pressure UV lamps, the lifetime of UV lamps is significantly lower. Furthermore, with the increased availability of LED lighting options, the power of using visible light photoreactors can be greatly reduced.…”

Section: Photocatalysismentioning

confidence: 99%

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

et al. 2020

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Increasing human activity, including commercial and noncommercial use of pharmaceuticals, personal care products, and agricultural products, has introduced new contaminants that can be challenging to remove with currently available technologies. Pharmaceuticals, in particular, can be especially challenging to remove from the water supply and can pose great harm to people and local ecosystems. Their highly stable nature makes their degradation with conventional water treatment techniques difficult, and studies have shown that even advanced treatment of water is unable to remove some compounds. As such, decontamination of water from pharmaceuticals requires the development of advanced technologies capable of being used in indirect and direct potable water reuse. In this review, we discuss pharmaceutical removal in indirect potable water treatment and how recent advancements in adsorption and photocatalysis technologies can be used for the decontamination of pharmaceutical-based emerging contaminants. For instance, new materials that incorporate graphene-based nanomaterials have been developed and shown to have increased adsorptive capabilities toward pharmaceuticals when compared with unmodified graphene. In addition, adsorbents have been incorporated in membrane technologies, and photocatalysts have been combined with magnetic material and coated on optical fibers improving their usability in water treatment. Advancements in photocatalytic material research have enabled the development of highly effective materials capable of degradation of a variety of pharmaceutical compounds and the development of visible-light photocatalysts. To understand how adsorbents and photocatalysts can be utilized in water treatment, we address the benefits and limitations associated with these technologies and their potential applicability in indirect potable water reuse plants.

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Section: Photocatalysismentioning

confidence: 99%

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

et al. 2020

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“…The TPD technique can be used to ascertain the nature and quantity of these groups from the amounts of CO 2 and CO released upon heating the sample at controlled conditions [71]. Complementary to TPD methods, even though no FTIR signal can be collected for pristine graphene, this spectroscopy method is frequently used to identify SOG and other functionalities created on graphene-based catalysts used for ozone reactions [48,49,50,52,53,58,68,73]. TG, DTG, and DTA analyses have also been carried out by some researchers to investigate the chemical composition (i.e., carbon content) and thermal stability of graphene-based composites [46,49]).…”

Section: Methods Used For the Characterization Of Graphene-based Cmentioning

confidence: 99%

“…After centrifugation and washing with aqueous HCl and deionized water, the resulting solid was dried in an oven at 80 °C [50]. An electrophoretic method was used to coat a titan grid sheet with N-TiO 2 and GO [53]. A suspension of N-TiO 2 , GO, and magnesium nitrate in 2-propanol was sonicated and placed in an electrochemical cell between the titan grid sheet and a stainless steel plate.…”

Section: Synthesis Of Graphene-based Catalysts For Ozonation Procementioning

confidence: 99%

“…In many instances GO is reduced chemically or thermally to obtain rGO, the material most used so far as catalyst in ozone processes [43,44]. In addition to GO and rGO, some graphene-based hybrid materials have been successfully tested as catalysts or photocatalysts in ozonation reactions [45,46,47,48,49,50,51,52,53,54]. The presence of graphene derivatives provides the composite with a higher surface area and, in photocatalytic reactions, suppresses to some extent the electron-hole recombination and/or reduces the band gap of the composite so that it becomes active under visible light.…”

Section: Introductionmentioning

confidence: 99%

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Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

2019

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The use of graphene-based materials as catalysts in both ozone and ozone/radiation processes is creating interest among researchers devoted to the study of advanced oxidation processes (AOPs) for the degradation of organic pollutants in water. In this review, detailed explanations of catalytic and photocatalytic ozonation processes mediated by graphene-based materials are presented, focusing on aspects related to the preparation and characterization of catalysts, the nature of the water pollutants treated, the type of reactors and radiation sources applied, the influence of the main operating variables, catalyst activity and stability, and kinetics and mechanisms.

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“…This observation is related to the hydrolysis of the CEF molecules due to the instability of the β-lactam ring at high pH amounts. [59,60] Therefore, CEF is completely stable in the selected pH range (0.5-10.5) of the experimental design [61] and so, all results regarding the CEF degradation are related to the photocatalytic behavior.…”

Section: Designing the Experiments And Statistical Investigationsmentioning

confidence: 98%

High Performance Magnetically Separable G‐C₃N₄/γ‐Fe₂O₃/TiO₂ Nanocomposite with Boosted Photocatalytic Capability towards the Cefixime Trihydrate Degradation under Visible‐Light

2020

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A magnetically separable g‐C3N4/γ‐Fe2O3/TiO2 nanocomposite is synthesized as an intensely effectual visible‐light‐driven photocatalyst. It is fully characterized by FT‐IR, XPS, XRD, VSM, DRS, SEM, TEM, BET, EDS, and elemental mapping techniques. Based on the Tauc plot of (αhν)2 vs. hυ, the value of band gap energy for g‐C3N4/γ‐Fe2O3/TiO2 is estimated to be 2.6 eV, which proves the high capability of the catalyst to enhance the photoinduced electron‐holes separation and improves its visible‐light photocatalytic performance. The high photocatalytic activity of this catalyst towards the cefixime trihydrate (CEF) degradation, under visible‐light radiation can be ascribed to the synergistic optical effects between g‐C3N4, γ‐Fe2O3, and TiO2. Using central composite design (CCD) based on response surface methodology (RSM), the maximum degradation efficiency of about 98 % was obtained at the optimal conditions comprising the CEF amount of 20 mg/L, photocatalyst value of 0.04 g/L, irradiation intensity of 9 W/m2, and pH of 5.5, at 90 min. Utilizing an innocuous visible‐light source, almost complete mineralization of CEF (based on TOC analysis), using a very low amount of photocatalyst, applying air as the oxidant, and convenient magnetic separation of the catalyst from the reaction media and its ease of recycling for at least seven consecutive runs are the major highlights of this protocol.

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Preparation of nano N-TiO2/graphene oxide/titan grid sheets for visible light assisted photocatalytic ozonation of cefixime

Cited by 81 publications

References 34 publications

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

High Performance Magnetically Separable G‐C₃N₄/γ‐Fe₂O₃/TiO₂ Nanocomposite with Boosted Photocatalytic Capability towards the Cefixime Trihydrate Degradation under Visible‐Light

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Preparation of nano N-TiO2/graphene oxide/titan grid sheets for visible light assisted photocatalytic ozonation of cefixime

Cited by 81 publications

References 34 publications

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

High Performance Magnetically Separable G‐C3N4/γ‐Fe2O3/TiO2 Nanocomposite with Boosted Photocatalytic Capability towards the Cefixime Trihydrate Degradation under Visible‐Light

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High Performance Magnetically Separable G‐C₃N₄/γ‐Fe₂O₃/TiO₂ Nanocomposite with Boosted Photocatalytic Capability towards the Cefixime Trihydrate Degradation under Visible‐Light