Emerging Trends in the Remediation of Persistent Organic Pollutants Using Nanomaterials and Related Processes: A Review

Boulkhessaim, S.; Gacem, Amel; Khan, Samreen Heena; Amari, Abdelfattah; Yadav, Veejendra K.; Harharah, Hamed N.; Elkhaleefa, Abubakr; Yadav, Krishna Kumar; Rather, Sami‐ullah; Ahn, Hyun-Jo; Jeon, Byong‐Hun

doi:10.3390/nano12132148

Cited by 40 publications

(4 citation statements)

References 153 publications

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“…Organic pollutants are persistent longer in the environment and their bioaccumulation and pervasiveness makes them highly toxic to aquatic life, including humans, plants, and animals [1]. Methylene blue dye is one of the persistent organic pollutants released by the textile industries along with sewage to water sources and other environments.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of different metals doped α-PbO nanoparticles for photocatalytic degradation of Methylene Blue dye

et al. 2023

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In recent days, metallic oxide semiconductor nanoparticles have drawn attention to the photocatalytic degradation of organic pollutants. In the present work, undoped and different metals (Sn, Co, Cu, Ni, and Li)-doped of α-PbO nanoparticles were successfully synthesized by a facile chemical precipitations method. The obtained nanoparticles were further studied by using different characterization techniques. The XRD results confirmed that the prepared nanoparticles were a tetragonal, α-PbO phase crystal structure without mixing other PbO phases. The obtained optical band gaps from UV-Vis DRS analysis were 2.03 eV, 2.68 eV, 1.61 eV, 1.78 eV, 1.67 eV, and 2.00 eV for pristine α-PbO, Sn, Co, Cu, Ni, and Li doped α-PbO respectively. From the PL emission, the lowest PL intensity of the doped samples indicated the low recombination of the electron-hole pairs that improved the photocatalytic performance of pristine α-PbO. SEM and EDX were used to analyze the surface morphology and composition of the synthesized nanoparticles, respectively. The photocatalytic activities of the prepared nanoparticles were assessed through the degradation of the Methylene Blue (MB) dye under visible light irradiation. The UV-Visible spectrophotometer analysis showed that the MB dye concentration decreased as the irradiation time varied from 20 to 100 min. The results showed that within 100 minutes, the Sn-doped α-PbO nanoparticles possessed the maximum degradation efficiency compared to other metal-doped α-PbO nanoparticles, with 100 % MB dye degradation compared to 94.76 % by pristine α-PbO. This was due to the increased visible light harvesting, which aided in the photocatalytic degradation of MB dye.

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of different metals doped α-PbO nanoparticles for photocatalytic degradation of Methylene Blue dye

et al. 2023

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“…Much has been written in the literature about heterojunction photocatalysts for wastewater treatment because of their unique properties such as ease of fabrication, low cost, chemical stability, and non-toxicity [ 13 – 15 ]. However, heterojunction photocatalysts have some drawbacks that limit their practical application such as rapid recombination of charge carriers and limited absorption of visible light, which reduces the photocatalytic efficiency [ 16 , 17 ]. Therefore, the photocatalytic efficiency of the heterojunction photocatalyst can be greatly improved by coating the photocatalyst surface with metal nanoparticles (NPs) as plasmonic materials known as plasmonic-based heterojunction photocatalysts [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

A review on plasmonic-based heterojunction photocatalysts for degradation of organic pollutants in wastewater

et al. 2023

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Organic pollutants in wastewater are the biggest problem facing the world today due to population growth, rapid increase in industrialization, urbanization, and technological advancement. There have been numerous attempts to use conventional wastewater treatment techniques to address the issue of worldwide water contamination. However, conventional wastewater treatment has a number of shortcomings, including high operating costs, low efficiency, difficult preparation, fast recombination of charge carriers, generation of secondary waste, and limited light absorption. Therefore, plasmonic-based heterojunction photocatalysts have attracted much attention as a promising method to reduce organic pollutant problems in water due to their excellent efficiency, low operating cost, ease of fabrication, and environmental friendliness. In addition, plasmonic-based heterojunction photocatalysts contain a local surface plasmon resonance that enhances the performance of photocatalysts by improving light absorption and separation of photoexcited charge carriers. This review summarizes the major plasmonic effects in photocatalysts, including hot electron, local field effect, and photothermal effect, and explains the plasmonic-based heterojunction photocatalysts with five junction systems for the degradation of pollutants. Recent work on the development of plasmonic-based heterojunction photocatalysts for the degradation of various organic pollutants in wastewater is also discussed. Lastly, the conclusions and challenges are briefly described and the direction of future development of heterojunction photocatalysts with plasmonic materials is explored. This review could serve as a guide for the understanding, investigation, and construction of plasmonic-based heterojunction photocatalysts for various organic pollutants degradation. Graphical abstract Herein, the plasmonic effects in photocatalysts, such as hot electrons, local field effect, and photothermal effect, as well as the plasmonic-based heterojunction photocatalysts with five junction systems for the degradation of pollutants are explained. Recent work on plasmonic-based heterojunction photocatalysts for the degradation of various organic pollutants in wastewater such as dyes, pesticides, phenols, and antibiotics is discussed. Challenges and future developments are also described.

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“…The continuous input of fluorine in the environmental water body and the excessive fluoride in the water body due to the dissolution of natural sources such as fluorine-rich minerals and the intensification of human activities are threatening the safety of drinking water quality for residents [6]. Excessive intake of fluoride will not only cause diseases such as dental fluorosis and bone fluorosis, but also adversely affect the body's immune system, kidneys, and gastrointestinal tract [7][8][9]. Excessive fluorine content will affect the metabolism of calcium and phosphorus in the human body.…”

Section: Introductionmentioning

confidence: 99%

Exploration and Optimisation of High-Salt Wastewater Defluorination Process

Chen¹,

Zhao²,

Tao³

et al. 2022

Water

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The typical lime precipitation method is used to treat high-concentration fluorine-containing wastewater. In this way, the fluorine in the wastewater can be removed in the form of CaF2. Thus, this method has a good fluoride removal effect. In this study, calcium hydroxide was used to adjust the pH and achieve a significant fluoride removal effect at the same time. The removal rate of fluoride ion decreases gradually with the increase in the concentration of sulphate in the raw water. When the synergistic defluorination cannot meet the requirements of water production, adding a step of aluminium salt flocculation and precipitation can further reduce the fluoride ion concentration. According to the feasibility of the actual project, this study improves the lime coagulation precipitation defluorination process on this basis, and the combined process is synchronised. In the process optimisation, barium chloride is added to remove the influence of sulphate radicals in the water, and then, the pH is adjusted to 5–6. The fluoride ion concentration in high-salt wastewater can be reduced from 446.6 mg/L to 35.4 mg/L by defluorination after pre-treatment whose removal rate was 92.1%. The combined process synchronously removes fluorine and purifies the water quality to a certain extent. Indicators such as COD, total phosphorus, ammonia nitrogen, and chloride ions in wastewater are reduced, and the removal rate is increased by 35.5% under the same conditions. This scheme improves the wastewater treatment effect without increasing the existing treatment equipment. Thus, it achieves a better defluorination effect and reduces the dosage of chemicals as much as possible, which is conducive to lowering the discharge of sludge after treatment.

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Emerging Trends in the Remediation of Persistent Organic Pollutants Using Nanomaterials and Related Processes: A Review

Cited by 40 publications

References 153 publications

Facile synthesis of different metals doped α-PbO nanoparticles for photocatalytic degradation of Methylene Blue dye

Facile synthesis of different metals doped α-PbO nanoparticles for photocatalytic degradation of Methylene Blue dye

A review on plasmonic-based heterojunction photocatalysts for degradation of organic pollutants in wastewater

Exploration and Optimisation of High-Salt Wastewater Defluorination Process

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