Evaluation of the Photocatalytic Activity of Copper Doped TiO2 nanoparticles for the Purification and/or Disinfection of Industrial Effluents

Pedroza-Herrera, Gladis; Medina-Ramírez, Iliana E.; Lozano-Álvarez, Juan Antonio; Rodil, S.E.

doi:10.1016/j.cattod.2018.09.017

Cited by 64 publications

(27 citation statements)

References 54 publications

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“…Gladis et al reported copper-doped TiO 2 nanoparticles synthesized by a two-step method. The sol–gel deposition was followed by microwave hydrothermal treatment, which achieved a band gap reduction down to 2.86 eV at a relatively low nominal doping level of 2.0% (Ref 30 ). Remarkable antibacterial properties against both gram-negative and gram-positive bacteria were realized by TiO 2 -Cu 2+ without any cytotoxicity to human blood cells, which was considered to be related to the leach of Cu ions in combination with the oxidative attack based on TiO 2 photocatalysis.…”

Section: Typical Photocatalytic Disinfection Materialsmentioning

confidence: 99%

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

et al. 2020

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There have been ever-growing demands for disinfection of water and air in recent years. Efficient, eco-friendly, and cost-effective methods of disinfection for pathogens are vital to the health of human beings. The photocatalysis route has attracted worldwide attention due to its highly efficient oxidative capabilities and sustainable recycling, which can be used to realize the disinfection purposes without secondary pollution. Though many studies have comprehensively reviewed the work about photocatalytic disinfection, including design and fabrication of photocatalytic coatings, inactivation mechanisms, or practical applications, systematic reviews about the disinfection photocatalysis coatings from fabrication to effort for practical use are still rare. Among different ways of fabricating photocatalytic materials, thermal spray is a versatile surface coating technique and competitive in constructing large-scale functional coatings, which is a most promising way for the future environmental purification, biomedical and life health applications. In this review, we briefly introduced various photocatalytic materials and corresponding inactivation mechanisms for virus, bacteria and fungus. We summarized the thermal-sprayed photocatalysts and their antimicrobial performances. Finally, we discussed the future perspectives of the photocatalytic disinfection coatings for potential applications. This review would shed light on the development and implementation of sustainable disinfection strategies that is applicable for extensive use for controlling pathogens in the near future.

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Section: Typical Photocatalytic Disinfection Materialsmentioning

confidence: 99%

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

et al. 2020

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“…[54] Cu-doped TiO 2 materials exhibit enhanced photocatalytic organic degradation and fuel production. [48,54,55] In some cases, Cu 2+ on the surface of TiO 2 significantly enhanced photocatalytic performance. [56] The effect of metal doping for the enhancement of photocatalytic activity is associated with inherently induced oxygen vacancies and the presence of metal dopants in the lattice of TiO 2 .…”

Section: Metallic Ion Dopingmentioning

confidence: 99%

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

Jeon

Kweon

Jang

et al. 2020

Advanced Sustainable Systems

102

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charge separation and intrinsic efficiency, which are limited by the material's wide bandgap (≈3 eV). To overcome these issues, countless studies have focused on modifying the properties of TiO 2 , such as controlling its crystal structures, morphologies, vacancies, and doping. Existing natural TiO 2 polymorphs, the anatase and rutile phases, are generally considered representative photocatalytic materials. However, brookite has not been actively studied because in the past it has been difficult to synthesize. Anatase is known to more efficiently separate photoexcited charge carriers than rutile, but its thermodynamic stability has the reverse tendency. [14,15] While studying the different properties of various TiO 2 crystal structures, morphology-dependent characteristics have also been investigated, including efficient charge carrier dynamics, which include longer charge carrier diffusion length than the particle size to separate charges suppressing charge recombination. In addition to these high-crystalline-controlled studies, defect engineering approaches have also been vigorously investigated, to extend the material's light absorption range from the ultraviolet (UV) region to visible light. The general method used to enhance photocatalytic performance has been to introduce defects into TiO 2 structures, by chemical and physical doping, and induce vacancies in titanium (Ti) or oxygen (O) positions. These defect engineering strategies create new energy states, which act as charge trapping sites or narrowing bandgap to extend light absorption region. The formation of new energy states and defect sites is dependent on synthesis methods and conditions, indicating that predicting property and mechanism of synthesized TiO 2 materials is difficult before testing catalytic reactions. This uncertainty is one of the main problems to design new high-performance catalysts. Up to now, numerous researches have been reported to enhance photocatalytic activities and to reveal the mechanism. Even though it has not been confirmed the mechanism and activity for all situations, we can get insight for comprehensive understanding to predict and to design new catalysts. This work reviews modifying strategies of TiO 2 materials to enhance their photocatalytic activity with categorizing in the several systems. First, the basic principles of photocatalytic reactions on TiO 2 are described. Second, the characteristics of surface modification with other elements and doped systems in the lattice of photocatalysts are discussed. Finally, multicomponent heterostructure systems and current photocatalyst To address energy and environmental problems, innumerable titanium dioxide (TiO 2)-based photocatalysts have been reported over the last four decades. TiO 2 has attracted immense interest because it is low-cost, abundant, and photoresponsive. Sunlight-driven fuel production is one of the ideal photocatalytic approaches in terms of economics and the environment. However, performance issues with TiO 2 photocatalysts remain, including insuffici...

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“…The large-scale application of photocatalytic disinfection process is also prevented by the difficulty of obtaining photocatalysts and their purchase cost [ 112 ]. However, the growing use of support materials is partly solving the separation and reuse mechanisms of photocatalysts, making it possible to apply it on a WWTP [ 113 ]. Future research must focus on the study of economically sustainable, easily available, reusable, regenerable and low environmental impact semiconductor materials with a minimum waste of resources.…”

Section: Combination With Other Technologiesmentioning

confidence: 99%

Disinfection of Wastewater by UV-Based Treatment for Reuse in a Circular Economy Perspective. Where Are We at?

Collivignarelli

Abbà

Miino

et al. 2020

IJERPH

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Among the critical issues that prevent the reuse of wastewater treatment plants (WWTPs) effluents in a circular economy perspective, the microbiological component plays a key role causing infections and diseases. To date, the use of conventional chemical oxidants (e.g., chlorine) represent the main applied process for wastewater (WW) disinfection following a series of operational advantages. However, toxicity linked to the production of highly dangerous disinfection by-products (DBPs) has been widely demonstrated. Therefore, in recent years, there is an increasing attention to implement sustainable processes, which can simultaneously guarantee the microbiological quality of the WWs treated and the protection of both humans and the environment. This review focuses on treatments based on ultraviolet radiation (UV) alone or in combination with other processes (sonophotolysis, photocatalysis and photoelectrocatalysis with both natural and artificial light) without the dosage of chemical oxidants. The strengths of these technologies and the most significant critical issues are reported. To date, the use of synthetic waters in laboratory tests despite real waters, the capital and operative costs and the limited, or absent, experience of full-scale plant management (especially for UV-based combined processes) represent the main limits to their application on a larger scale. Although further in-depth studies are required to ensure full applicability of UV-based combined processes in WWTPs for reuse of their purified effluents, excellent prospects are presented thanks to an absent environmental impact in terms of DBPs formation and excellent disinfection yields of microorganisms (in most cases higher than 3-log reduction).

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Evaluation of the Photocatalytic Activity of Copper Doped TiO2 nanoparticles for the Purification and/or Disinfection of Industrial Effluents

Cited by 64 publications

References 54 publications

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

Disinfection of Wastewater by UV-Based Treatment for Reuse in a Circular Economy Perspective. Where Are We at?

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Evaluation of the Photocatalytic Activity of Copper Doped TiO2 nanoparticles for the Purification and/or Disinfection of Industrial Effluents

Cited by 64 publications

References 54 publications

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

Enhancing the Photocatalytic Activity of TiO2 Catalysts

Disinfection of Wastewater by UV-Based Treatment for Reuse in a Circular Economy Perspective. Where Are We at?

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Enhancing the Photocatalytic Activity of TiO₂ Catalysts