Photocatalytic removal of toxic dyes, liquorice and tetracycline wastewaters by a mesoporous photocatalyst under irradiation of different lamps and sunlight

Mahmoodi, Maryam; Rafiee, Ebrahim; Eavani, Sara

doi:10.1016/j.jenvman.2022.115023

Cited by 20 publications

(5 citation statements)

References 31 publications

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“…This strategic modulation amplifies the overall photocatalytic performance. K 5 CoW 12 /TiO 2 (CoW 12 /TiO 2 , 5000 mg/L) synthesized by sol-gel/hydrothermal method achieved the complete removal of RhB (15 mg/L) within 30 min at pH = 5 under visible light irradiation (Table 2) [95]. And the performance remained unchanged after four cycles.…”

Section: Rhodamine B (Rhb)mentioning

confidence: 99%

“…(1) Incorporation onto Suitable Carriers: The introduction of POMs into appropriate carriers, such as SiO 2 , provides a stable scaffold that enhances stability and activity [126,138,144]; (2) Surface Modification: After immobilizing POMs molecules onto carrier surfaces, the introduction of light-absorbing groups or the adjustment of surface chemistry enhances the POMs' absorption capacity, even within the visible light range [66,67,83]; (3) Fabrication of Composite Materials: The combination of POMs with other optically active materials, such as semiconductor nanoparticles (TiO 2 and ZnO), results in synergistic composite systems that elevate visible light absorption and electron transfer efficiency [95,98,106];…”

Section: Enhancement Strategies For Pom-based Materialsmentioning

confidence: 99%

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Advances in Polyoxometalates as Electron Mediators for Photocatalytic Dye Degradation

Li,

Wang,

Zeng

et al. 2023

IJMS

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The increasing concerns over the environment and the growing demand for sustainable water treatment technologies have sparked substantial interest in the field of photocatalytic dye removal. Polyoxometalates (POMs), known for their intricate metal–oxygen anion clusters, have received considerable attention due to their versatile structures, compositions, and efficient facilitation of photo-induced electron transfers. This paper provides an overview of the ongoing research progress in the realm of photocatalytic dye degradation utilizing POMs and their derivatives. The details encompass the compositions of catalysts, catalytic efficacy, and light absorption propensities, and the photocatalytic mechanisms inherent to POM-based materials for dye degradation are exhaustively expounded upon. This review not only contributes to a better understanding of the potential of POM-based materials in photocatalytic dye degradation, but also presents the advancements and future prospects in this domain of environmental remediation.

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Section: Rhodamine B (Rhb)mentioning

confidence: 99%

Section: Enhancement Strategies For Pom-based Materialsmentioning

confidence: 99%

Advances in Polyoxometalates as Electron Mediators for Photocatalytic Dye Degradation

Li,

Wang,

Zeng

et al. 2023

IJMS

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“…Due to the extremely rapid exhaustion of dissolved oxygen, a consistent and sufficient resource is required, which has an impact on operating costs. Although irradiation is a simple and effective technique, its use on a broad scale is limited due to maintenance and cost considerations [33].…”

Section: Chemical Treatmentmentioning

confidence: 99%

Methylene blue and Congo red removal by activated carbons: A current literature

Hao

Othman

Zaini

2022

Acta Universitatis Sapientiae, Agriculture and Environment

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Dye is a major source of water pollution. This mini-review highlights the origin of dye, its removal strategies, and the recent literature of methylene blue and Congo red adsorption by activated carbons. Adsorption is a unique process that relies upon the physicochemical properties of the activated carbon and the inherent characteristics of dye. Also, factors affecting adsorption, such as contact time, temperature, and concentration, were discussed to gain insight into dye removal mechanisms.

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“…Contaminants discharged from industries and through anthropogenic activities into aqueous media are responsible for water pollution [1], water shortage crises [2], and contamination of the environment [3]. In wastewater, most contaminants are non-biodegradable and resistant to natural degradation, such as OTC [4] and licorice [5]. Tetracycline-based OTC antibiotics are used worldwide for human and veterinary medicine [6]; however, OTC is poorly absorbed in the digestive tract (30%) and most of it enters the environment through body excretions [7].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Enhanced Photocatalytic Activity of Visible Light-Active Nanostructures for Degradation of Oxytetracycline and COD Removal of Licorice Extraction Plant Wastewater

Zangeneh

Mousavi

Eskandari

et al. 2023

Water

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This study evaluates the effects of carbon, nitrogen, and sulfur dopants on the photocatalytic activity of TiO2 for degradation of oxytetracycline (OTC) and chemical oxygen demand (COD) removal from licorice extraction plant wastewater (LEPW). Three novel visible-light-responsive nanostructures, including L-Histidine-TiO2, L-Methionine-TiO2 and L-Asparagine-TiO2, were successfully synthesized. The results showed that the modification of TiO2 with these three amino acids made the catalyst active in the visible light region and reduced the recombination rate of e−/h+ pairs according to PL analysis. The photodegradation efficiency of L-Histidine (2 wt.%)-TiO2 was 100% and 94% for OTC and COD, respectively. It showed the highest photocatalytic activity under illumination, compared to L-Methionine (1.5 wt.%)-TiO2 and L-Asparagine (2 wt.%)-TiO2. Synthesized composites were characterized with SEM, XRD, FTIR, DRS, and PL analyses. The biological oxygen demand to COD (BOD5/COD) ratio for treated LEPW was determined to be 0.5–0.6, confirming the enhanced biodegradability of the treated effluent. The effect of the independent variables, namely, initial concentration of OTC and COD, catalyst dosage, irradiation time, pH of solution, and light intensity, on the photocatalytic process was evaluated by Response Surface Methodology (RSM), and the optimum value of each independent parameter for maximum degradation of OTC and COD by L-Histidine (2 wt.%)-TiO2 was determined. The radical trapping experiment was performed with various scavengers in order to propose a photocatalytic mechanism, showing that hydroxyl radicals were the main active species. L-Histidine (2 wt.%)-TiO2 showed a stable and reusable structure even after four cycles of COD removal under the following optimal conditions of [COD]: 300 mg/L, [catalyst]: 1 g/L, light intensity: 25 W/cm2 at pH = 4 after 180 min irradiation.

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Photocatalytic removal of toxic dyes, liquorice and tetracycline wastewaters by a mesoporous photocatalyst under irradiation of different lamps and sunlight

Cited by 20 publications

References 31 publications

Advances in Polyoxometalates as Electron Mediators for Photocatalytic Dye Degradation

Advances in Polyoxometalates as Electron Mediators for Photocatalytic Dye Degradation

Methylene blue and Congo red removal by activated carbons: A current literature

Comparative Study on Enhanced Photocatalytic Activity of Visible Light-Active Nanostructures for Degradation of Oxytetracycline and COD Removal of Licorice Extraction Plant Wastewater

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