Development of Sustainable Heterogeneous Catalysts for the Photocatalytic Treatment of Effluents

Sales, Herbet Bezerra; Menezes, Romualdo Rodrigues; Neves, G. A.; Souza, João Jarllys Nóbrega de; Ferreira, J. M.; Chantelle, Laís; Oliveira, André Luiz Menezes de; Lira, Hélio Lucena

doi:10.3390/su12187393

Cited by 21 publications

(17 citation statements)

References 70 publications

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“…In the last decades, advanced oxidation processes, including both homogenous and heterogeneous catalysis, have been frequently employed to remove a wide range of inorganic and organic contaminants from water and wastewater [9][10][11]. Various semiconducting metal oxides have been successfully utilized as heterogeneous catalysts for the photoassisted degradation of dye pollutants [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Methylene Blue Dye by Electrospun Binary and Ternary Zinc and Titanium Oxide Nanofibers

Petrovičovà

Dahrouch²,

Triolo

et al. 2021

Applied Sciences

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Synthetic dyes, dispersed in water, have harmful effects on human health and the environment. In this work, Ti and/or Zn oxide nanofibers (NFs) with engineered architecture and surface were produced via electrospinning followed by calcination. Calcination and subsequent cooling were operated at fast rates to generate porous NFs with capture centers to reduce the recombination rate of the photogenerated charges. After morphological and microstructural characterisation, the NFs were comparatively evaluated as photocatalysts for the removal of methylene blue from water under UV irradiation. The higher band gap and lower crystallinity were responsible for the lower photocatalytic activity of the ternary oxides (ZnTiO3 and Zn2TiO4) towards the degradation of the dye. The optimal loads of the highly performing binary oxides were determined. By using 0.66 mg mL−1 wurtzite ZnO for the discoloration of an aqueous solution with a dye concentration of 15 µM, a higher rate constant (7.94 × 10−2 min−1) than previously reported was obtained. The optimal load for anatase TiO2 was lower (0.33 mg mL−1). The corresponding rate constant (1.12 × 10−1 min−1) exceeds the values reported for the commonly used P25–TiO2 benchmark. The catalyst can be reused twice without any regeneration treatment, with 5.2% and 18.7% activity decrease after the second and third use, respectively.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Methylene Blue Dye by Electrospun Binary and Ternary Zinc and Titanium Oxide Nanofibers

Petrovičovà

Dahrouch²,

Triolo

et al. 2021

Applied Sciences

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“…The main hazards of dye wastewater are as follows: the chromaticity of dyes in wastewater can absorb light, reduce the transparency of water, consume a large amount of oxygen in water [3], and promote the growth of aquatic organisms and microorganisms. Additionally, most dyes are aromatic azo compounds [4]. When the biological toxicity is relatively high, some of them can even cause mutagenesis, carcinogenesis, and teratogenesis [5].…”

Section: Introductionmentioning

confidence: 99%

Carbene Ligand-Doped Fe2O3 Composite for Rapid Removal of Multiple Dyes under Sunlight

et al. 2021

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Contaminated water due to industrial organic dyes presents a significant challenge to sustainability. As a material of green energy, photocatalysts offer an effective and environmentally friendly way to deal with organic dyes for water treatment. A series of simple and highly efficient iron photocatalysts with carbene ligands were developed, which, under the illumination of sunlight, can rapidly degrade multiple organic dyes in water at room temperature, including rhodamine B (RhB), indigo carmine (IC), methyl blue (MB), and congo red (CR). The field-only surface integral method was carried out to determine the absorption spectrum of photocatalyst particles. Under the optimized experimental conditions which were selected by the orthogonal experiments for four dyes, 0.5a@Fe2O3 and 2c@Fe2O3 demonstrated good stability and photocatalytic activity. These two composite materials not only have the ability to remove 98.0% of the degradation in 10 s, but also maintain high reactivity after a few cycles of repeated use.

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“…As an additional trap for photogenerated charge generation, the metal cation avoids or decreases the electron/hole reorganization under any circumstances. Semiconductor metal oxides with ZnO as a bimetallic oxide pair, for instance, SnO 2 , V 2 O 5 , WO 3 , and MoO 3 [22], were examined in order to enhance the photocatalytic properties of ZnO [23]. Additionally, combinations of trimetallic oxides, like Zn 0 .…”

Section: Introductionmentioning

confidence: 99%

Research on the Sustainable Heterogeneous Catalyst Development for Photocatalytic Treatment of Phenol

Zhang

Wen-Rui

2021

Sustainability

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A large amount of wastewater from various and discharged sources that are not treated in any way could affect properties of both land and water, causing severe problems for the environment. Advanced oxidation processes seem to be a feasible option to address effluent treatment with regard to salvation of the environment. In this work, a CdO/ZnO/Yb2O3 composite composed of trimetallic semiconductors was synthesized through a simple one-pot hydrophile approach at low temperatures and then was employed as a photocatalyst. The degradation of phenol, a common organic persistent pollutant in industrial wastewater, was efficiently catalyzed in the presence of simulated sunlight. It was demonstrated that the synthesized CdO/ZnO/Yb2O3 photocatalyst was significantly active after 15 min of reaction and facilitated the effective degradation of the phenol. The CdO/ZnO/Yb2O3 photocatalyst achieved 71.5% and 97.81% degradation of the phenol without and with the existence of H2O2, correspondingly. The results show that the synthesized composite possesses high oxygen reduction capability and is available for rapid and potent photodegradation of the organic persistent pollutants such as phenol, with minimal damage to the environment.

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Development of Sustainable Heterogeneous Catalysts for the Photocatalytic Treatment of Effluents

Cited by 21 publications

References 70 publications

Photocatalytic Degradation of Methylene Blue Dye by Electrospun Binary and Ternary Zinc and Titanium Oxide Nanofibers

Photocatalytic Degradation of Methylene Blue Dye by Electrospun Binary and Ternary Zinc and Titanium Oxide Nanofibers

Carbene Ligand-Doped Fe2O3 Composite for Rapid Removal of Multiple Dyes under Sunlight

Research on the Sustainable Heterogeneous Catalyst Development for Photocatalytic Treatment of Phenol

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