Eco-friendly synthesized α-Fe2O3/TiO2 heterojunction with enhanced visible light photocatalytic activity

Mohamed, Hanan H.; Alomair, Nuhad A.; Akhtar, Sultan; Youssef, Tamer E.

doi:10.1016/j.jphotochem.2019.111951

Cited by 48 publications

(14 citation statements)

References 39 publications

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“…As a result, high concentration of electrons in the CB of TiO 2 is obtained (photoexcited electrons from TiO 2 VB and electrons injected into TiO 2 from FeOOH or Fe 2 O 3 ) and they can generate superoxide ions (Figure 9). At the same time, holes from the TiO 2 VB will move to the VB of FeOOH or Fe 2 O 3 , resulting in the high concentration of holes in the VB of FeOOH or Fe 2 O 3 in heterostructures [29,50,60,[62][63][64][65]. Oxidative degradation of the BT involves holes from TiO 2 and hydroxyl radicals formed at the photocatalyst/liquid interface [55].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Hydrothermal Synthesis of FeOOH and Fe2O3 Modified Self-Organizing Immobilized TiO2 Nanotubes for Photocatalytic Degradation of 1H-Benzotriazole

Čižmar

Kojić

Rukavina³

et al. 2020

Catalysts

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In this study, titanium dioxide nanotubes were prepared by electrochemical anodization technique and modified with an aqueous solution of FeCl3 using hydrothermal synthesis method to control the amount and distribution of iron compounds on the anatase TiO2 nanotubes. The objective was to synthesize immobilized FeOOH@TiO2 or Fe2O3@TiO2 photocatalysts designed for the flow-through reactor systems; to investigate thermal treatment effect on the photocatalytic efficiency; to determine appropriate Fe-compounds concentration for the maximum photocatalytic activity improvement, and to explain the mechanism responsible for the enhancement. The photocatalysts were tested for the degradation of 1H-benzotriazole in water under UV/solar light irradiation. Up to two times increase in the photocatalytic activity was obtained when TiO2 nanotubes were modified with 0.8 mM Fe. At higher Fe concentrations (8 mM and 80 mM), the photocatalytic activity of the given photocatalysts decreased. To confirm the formation of FeOOH or Fe2O3 species, and to clarify the mechanism of photoactivity, X-ray diffraction (XRD), Raman spectroscopy (RS), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDS) and UV-Vis spectroscopy were used.

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Section: Photocatalytic Activitymentioning

confidence: 99%

Hydrothermal Synthesis of FeOOH and Fe2O3 Modified Self-Organizing Immobilized TiO2 Nanotubes for Photocatalytic Degradation of 1H-Benzotriazole

Čižmar

Kojić

Rukavina³

et al. 2020

Catalysts

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“…Green synthesis of nanomaterials is an alternative route to physical and chemical methods that leads to environment-friendly products due to the use of non-toxic materials, and does not require high temperatures and pressure, and at a lower cost. Green synthesis may be by microorganisms, plant extracts, and plant biomass [17,18]. Therefore, using such a green and environmentally friendly method can also minimize the use of chemicals and toxic solvents.…”

Section: Introductionmentioning

confidence: 99%

“…Chemical compounds in the plant extract play the role of bio-template producing nanomaterials with modified morphology [17]. In addition, the eco-friendly method for synthesis of nanomaterials can also be achieved by reducing the required process temperature, using microwave or ultrasonic waves [7][8][9][10][11][12][13][14][15][16][17][18]. In recent years a number of nanoparticles have been prepared using fungi, bacteria, actinomycetes, and enzymes [19][20][21][22][23] and also have been used as many plant extracts such as camellia sinensis, neem, coriandrum, ocimum sanctum, nelumbo lucifera [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Environment-Friendly Nanoporous Titanium Dioxide with Enhanced Photocatalytic Activity

2019

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Nanoporous TiO2 anatase was environment-friendly prepared using coffee husk extract (CHE) as bio-template instead of hazardous chemicals and solvents and ultrasonic waves. Caffeine and caffeic acid were found to be the main compounds in CHE to modify the morphology of TiO2. The properties of as-prepared titanium dioxide particles were determined by different characterization techniques. The results demonstrate the formation of a meso/macro-porous channel consisting of small TiO2 particles (8–10 nm). The as prepared green nanoparticles exhibited improved photocatalytic activity for the degradation of organic water pollutants with good recyclability. The enhancement in efficiency of green nanoporous TiO2 can be attributed to higher surface area and the presence of more active adsorption sites inside the pores. The current research provides for a low cost, safe, and eco-friendly way to produce efficient photocatalysts for remediation of polluted water.

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“…Flax seed extract was prepared according to previous work (Mohamed et al 2019). Typically, a speci c amount of washed and grinded FS powder was dissolved in distilled water then heated until boiling.…”

Section: Materials Synthesismentioning

confidence: 99%

Eco-Friendly and Solar light Active Ti-Fe2O3 Ellipsoidal Capsules Nanostructure for Removal of Herbicides and Organic Dyes

Mohamed

Besisa

2022

Preprint

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In this work, Ti doped Fe2O3 with hollow ellipsoidal capsules nanostructure has been prepared in a green manner using plant extract (Flax seed). This new green hematite nanomaterial has been evaluated as photocatalyst for water treatment by testing its activity for degradation of bromophenol blue dye (BPB) and 2,4-dichlorophenoxy acetic acid (2,4-D) herbicide. For a better understanding of the green material properties, a comparison with the pristine Fe2O3 nanospheres previously prepared by the same procedure is included. Structural and optical properties of the green prepared materials are studied. The results revealed the success doping of Ti4+ at Fe3+ site, without forming any of TiO2 phases. It was also found that, the Ti doping is resulted in the reduction of the band gap of Fe2O3 as well as changing the morphology. The Ti-doped Fe2O3 nanomaterial exhibited an enhanced photocatalytic activity either for BPB dye or for 2,4-D degradation with more than 2 times higher rate than that using pristine Fe2O3.

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Eco-friendly synthesized α-Fe2O3/TiO2 heterojunction with enhanced visible light photocatalytic activity

Cited by 48 publications

References 39 publications

Hydrothermal Synthesis of FeOOH and Fe2O3 Modified Self-Organizing Immobilized TiO2 Nanotubes for Photocatalytic Degradation of 1H-Benzotriazole

Hydrothermal Synthesis of FeOOH and Fe2O3 Modified Self-Organizing Immobilized TiO2 Nanotubes for Photocatalytic Degradation of 1H-Benzotriazole

Environment-Friendly Nanoporous Titanium Dioxide with Enhanced Photocatalytic Activity

Eco-Friendly and Solar light Active Ti-Fe2O3 Ellipsoidal Capsules Nanostructure for Removal of Herbicides and Organic Dyes

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