Recent Advances in Photoreactors for Water Treatment

Mougnol, Jean Bedel Batchamen; Maswanganyi, Shelter; Gusain, Rashi; Kumar, Neeraj; Fosso‐Kankeu, Elvis; Ray, Suprakas Sinha; Waanders, F.B.

doi:10.1002/9781394167289.ch7

Cited by 5 publications

(4 citation statements)

References 92 publications

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“…These excited e − and h + then react with available oxygen and water to form the powerful hydroxyl radical, the key oxidizing species [15]. A unique approach to remove dyes by photocatalytic degradation process is the combination of two or more semiconductors such as g-C 3 N 4 , ZnO, ZnS, Fe 2 O 3 , ZnIn 2 S 4 , MoO 3 with different energy levels [16,17]. Photocatalyst adsorbent is a combination of a photocatalyst such as TiO 2 , ZnO, WO 3 , Fe 2 O 3 or CeVO 4 and an adsorbent such as zeolite, activated carbon or activated alumina [18].…”

Section: Introductionmentioning

confidence: 99%

CeVO 4 /Bentonite nanocomposite as a dual-functional photocatalytic adsorbent: One-step hydrothermal synthesis for enhanced water-soluble pollutant degradation

Farhadi,

Mousavi-Kamazani,

Keramati

et al. 2024

Preprint

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Cerium vanadate/Bentonite (CeVO4/bt) nanocomposite with different composition percentages was synthesized through a simple one-step hydrothermal method at 180 ℃ then photocatalytic activity was evaluated by decolorizing methylene blue (MB) in an aqueous solution under light exposure. The structural and optical properties of the synthesized composites were determined by XRD, FT-IR, DRS, FESEM, EDS, and BET measurements. XRD and EDS results confirmed the successful synthesis of CeVO4. The calculated band gap energy for modified cerium vanadate/bentonite (CeVO4/mbt) was the lowest among all, indicating its more appropriateness for photocatalytic removal of MB dye. nanoparticles were well distributed on bentonite. Due to the synergistic effects, the MB removal efficiency (for just 0.1 g) of CeVO4/mbt nanocomposite was significantly increased (99% in 15 min) compared with neat bentonite, CeVO4, and CeVO4/bt samples. The mineralization degree of MB dye was also studied which obtained 61% for CeVO4/mbt sample. The mentioned nanocomposite followed the first order kinetics and constant speed equal to 0.957 min-1 and showed acceptable stability in five consecutive cycles. This research presents a simple approach to creating novel, very efficient modified nanocomposites for use in photocatalysis applications.

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Section: Introductionmentioning

confidence: 99%

CeVO 4 /Bentonite nanocomposite as a dual-functional photocatalytic adsorbent: One-step hydrothermal synthesis for enhanced water-soluble pollutant degradation

Farhadi,

Mousavi-Kamazani,

Keramati

et al. 2024

Preprint

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show abstract

“…These excited e – and h + then react with available oxygen and water to form the powerful hydroxyl radical, the key oxidizing species 15 . A unique approach to remove dyes by photocatalytic degradation process is the combination of two or more semiconductors such as g-C 3 N 4 , ZnO, Fe 2 O 3 , ZnIn 2 S 4 , ZnS, MoO 3 with different energy levels 16 , 17 . Photocatalyst adsorbent is a combination of a photocatalyst such as TiO 2 , ZnO, WO 3 , Fe 2 O 3 or CeVO 4 and an adsorbent such as zeolite, activated carbon or activated alumina 18 .…”

Section: Introductionmentioning

confidence: 99%

One-step hydrothermal synthesis of CeVO4/bentonite nanocomposite as a dual-functional photocatalytic adsorbent for the removal of methylene blue from aqueous solutions

Farhadi,

Mousavi-Kamazani,

Keramati

et al. 2024

Sci Rep

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Cerium vanadate/modified bentonite (CeVO4/mbt) nanocomposite with different composition percentages was synthesized through a simple one-step hydrothermal method at 180 ℃, and then its photocatalytic activity was evaluated by decolorizing methylene blue (MB) in an aqueous solution under light exposure. In order to increase the surface area as an important parameter in photocatalytic processes, bentonite was modified by ball mill method. The structural and optical properties of the synthesized composites were determined by XRD, FT-IR, DRS, FESEM, EDS, and BET measurements. XRD and EDS results confirmed the successful synthesis of pure CeVO4. FESEM images and EDS mapping showed a proper distribution of rice-like CeVO4 nanoparticles on bentonite. The removal efficiency of MB with only 0.1 g of CeVO4/mbt nanocomposite in 15 min was about 99%, which is significant compared to neat bentonite and pure CeVO4 with efficiency of 30% and 57%. The mentioned nanocomposite followed the first-order kinetics, had a reaction rate constant equal to 0.1483 min–1, and showed acceptable stability in five consecutive cycles.

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“…Semiconductor photocatalysts have been proven successful candidates to convert toxic organic and inorganic water contaminant molecules into non-toxic molecules under the irradiation of light [9]. Dyes have received intense attention as model contaminants for photodegradation, including methylene blue (MB), methyl orange (MO), and rhodamine B (RhB) [10].…”

Section: Introductionmentioning

confidence: 99%

“…Dyes have received intense attention as model contaminants for photodegradation, including methylene blue (MB), methyl orange (MO), and rhodamine B (RhB) [10]. Photodegradation has also addressed antibiotics of growing concern such as tetracycline (TC), enrofloxacin (ENR), and other pharmaceuticals including diclofenac [6][7][8][9][10]. In addition, other toxic chemicals such as phenol and cyanide, heavy metal ions including Cr (VI), and bacteria like E. coli have been the subject of photocatalytic water treatment.…”

Section: Introductionmentioning

confidence: 99%

Evaluating The Performance of Various Semiconductor Photocatalysts for Municipal Wastewater Treatment - Effects of Photocatalyst Type and Dosage

2023

Nov. 16-17, 2023 Johannesburg (South Africa)Back 39th JOHANNESBURG International Conference on “Chemical, Biological and Enviro

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Water stress is a major concern as many cities worldwide face a rapidly depleting potable water supply. The prevailing water emergency requires a conscious effort to treat wastewater for reuse. The greatest challenge to accomplishing adequate wastewater remediation is maximizing the overall efficiency of wastewater treatment (WWT) systems. Advanced oxidation processes (AOPs) possess major prospects in WWT settings, if a suitable photocatalyst is considered. Therefore, this study aimed to evaluate the performance of various semiconductor photocatalysts for the treatment of municipal wastewater. The photocatalysts considered were Titanium dioxide (TiO2), Iron III oxide (Fe2O3), Zinc Sulphate (ZnSO4), and Copper Sulphate (CuSO4). Also, two operating parameters such as catalyst load (0.5-2.5 g/L), and mixing speed (30-150 rpm) at constant UV-exposure time (45 mins) were investigated. To ascertain photocatalytic efficiency, the pH, colour, turbidity, and chemical oxygen demand (COD) of the treated effluent were monitored. At catalyst loading (1.5 g/ L), mixing speed (90 rpm), and UV-exposure time (45 minutes), CuSO4 displayed the best results overall for COD removal efficiency of 72.47%, whilst ZnSO4 was very efficient in removing turbidity and colour with removal efficiencies of 79% and 65.89% respectively. In this study, CuSO4 was considered the most costeffective (R 2.01) semiconductor photocatalyst to degrade the high organic content of wastewater.

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Recent Advances in Photoreactors for Water Treatment

Cited by 5 publications

References 92 publications

CeVO 4 /Bentonite nanocomposite as a dual-functional photocatalytic adsorbent: One-step hydrothermal synthesis for enhanced water-soluble pollutant degradation

CeVO 4 /Bentonite nanocomposite as a dual-functional photocatalytic adsorbent: One-step hydrothermal synthesis for enhanced water-soluble pollutant degradation

One-step hydrothermal synthesis of CeVO4/bentonite nanocomposite as a dual-functional photocatalytic adsorbent for the removal of methylene blue from aqueous solutions

Evaluating The Performance of Various Semiconductor Photocatalysts for Municipal Wastewater Treatment - Effects of Photocatalyst Type and Dosage

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