Heterogeneous Photocatalytic Oxidation an Effective Tool for Wastewater Treatment – A Review

Kaan, Cheng Chee; Aziz, Azrina Abd; Ibrahim, Shaliza; Matheswaran, Manickam; Saravanan, Pichiah

doi:10.5772/30134

Cited by 5 publications

(6 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The composition influences the mobility of charge carriers during photocatalytic activity (Khan et al 2012 ; Talwara et al 2020 ). The fundamental composition includes a mono-component photocatalyst such as TiO 2 (Chee et al 2012 ), WO 3 (Kalogirou 2016 ), ZnO (Chen et al 2021 ), and Cu 2 S (Yang et al 2020c ). Even when doped or surface photosensitized, these materials exhibit charge recombination issues, a limited absorption range, and low chemical stability (Zhang et al 2021b ; Fan et al 2021b ; Qiao et al 2020 ).…”

Section: Significant Design and Scale-up Considerations In Wastewater...mentioning

confidence: 99%

See 1 more Smart Citation

The photocatalytic process in the treatment of polluted water

2022

View full text Add to dashboard Cite

Wastewaters often contain toxic organic pollutants with a possible adverse effect on human health and aquatic life upon exposure. Persistent organic pollutants such as dyes and pesticides, pharmaceuticals, and other chemicals are gaining extensive attention. Water treatment utilizing photocatalysis has recently received a lot of interest. Photocatalysis is cutting-edge, alternative technology. It has various advantages, including functioning at normal temperatures and atmospheric pressure, cheap prices, no secondary waste creation, and being readily available and easily accessible. This review presented a comprehensive overview of the advances in the application of the photocatalytic process in the treatment of highly polluted industrial wastewater. The analysis of various literature revealed that TiO 2 -based photocatalysts are highly effective in degrading organic pollutants from wastewater compared to other forms of wastewater treatment technologies. The electrical structure of a semiconductor plays a vital role in the photocatalyst's mechanism. The morphology of a photocatalyst is determined by the synthesis method, chemical content, and technical characteristics. The scaled-up of the photoreactors will significantly help in curbing the effect of organic pollutants in wastewater.

show abstract

Section: Significant Design and Scale-up Considerations In Wastewater...mentioning

confidence: 99%

“…An issue with odor 2. Requires more room Haq et al ( 2021 ) 5 Activated sludge 1. Providing a reasonable profit for a new endeavour 2.…”

Section: Introductionmentioning

confidence: 99%

The photocatalytic process in the treatment of polluted water

2022

View full text Add to dashboard Cite

show abstract

“…donde es el hueco en la banda de valencia [41] . La aplicación de la fotocatálisis se originó hacia 1972, cuando la hidrólisis fotocatalítica del agua se llevó a cabo usando electrodos de TiO 2 y, entonces, proliferó la investigación en relación a la fotocatálisis heterogénea [42] .…”

Section: Fotocatálisis Heterogéneaunclassified

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Juárez¹

2020

CULCYT

View full text Add to dashboard Cite

RESUMENEl objetivo de la presente revisión es presentar investigaciones recientes sobre la remoción de algunos edulcorantes -reconocidos como contaminantes emergentes-del agua o matrices acuosas, utilizando los Procesos de Oxidación Avanzada (POA). En un intento por evadir el consumo de endulzantes calóricos que han provocado problemas de salud, los seres humanos consumen edulcorantes artificiales que prácticamente no se metabolizan después de ingerirse, de esa forma se integran al agua residual e inclusive resisten la degradación total en las plantas de tratamiento de agua convencionales. Por tanto, en bases de datos se revisaron electrooxidación, electro-Fenton, foto-Fenton, fotocatálisis heterogénea, oxidación por ultravioleta/peróxido y oxidación por ultravioleta/ozono, catalogados como POA. Estos procesos son una alternativa debido a que generan radicales hidroxilo ·OH, caracterizados por su alto poder oxidante. La electrooxidación se puede declarar como la más conveniente para la degradación de edulcorantes artificiales como el acesulfamo de potasio, por ejemplo, debido a la menor cantidad de componentes requeridos para su ejecución y, al mismo tiempo, se logra una eficiencia de remoción similar, o incluso mayor, comparada con otros POA. Igualmente, se documentaron los resultados y méritos relativos a la aplicación de estos al agua o matrices acuosas, así como las oportunidades para investigación futura. ABSTRACTThe objective of this review is to present recent research on the removal of some sweeteners-recognized as emerging contaminants-from water or aqueous matrices, using the Advanced Oxidation Processes (AOPs). In an attempt to evade the consumption of caloric sweeteners that has caused health problems, humans consume artificial sweeteners that are practically not metabolized after ingestion, thus integrating into wastewater and even resisting total degradation in plants conventional water treatment. Therefore, electro-oxidation, electro-Fenton, photo-Fenton, heterogeneous photocatalysis, ultraviolet / peroxide oxidation and ultraviolet / ozone oxidation cataloged as AOPs were reviewed in databases. These processes are an alternative because they generate hydroxyl radicals ·OH characterized by their high oxidizing power. Electro-oxidation can be declared as the most convenient for the degradation of artificial sweeteners such as potassium acesulfame, for example, due to the lower amount of components required for its execution and at the same time the achievement of a similar removal efficiency, or even greater, compared to other AOPs. Likewise, the results and merits related to their application to water or aqueous matrices were documented, as well as the opportunities for future research.

show abstract

“…Biological treatments are the most economical ones, but present limited efficiency for the removal of POPs and produce sludge, while AOPs, such as Fenton like processes or ozonation, are characterized by high operating costs (chemicals and energy consumption). On the other hand, photocatalytic degradation process of POPs has instead gained much attention due to its effectiveness in fast degradation and mineralization of recalcitrant organic compounds, and many metal-oxide photocatalysts, such as TiO 2 , SnO 2 , and ZnO, have being extensively studied [3,4].…”

Section: Introductionmentioning

confidence: 99%

Highly Robust and Selective System for Water Pollutants Removal: How to Transform a Traditional Photocatalyst into a Highly Robust and Selective System for Water Pollutants Removal

et al. 2019

View full text Add to dashboard Cite

Highly porous monolithic aerogels based on ZnO photocatalyst and syndiotactic polystyrene (s-PS) were obtained by supercritical CO2 treatment of ZnO/s-PS gels. The prepared aerogels were characterized and their photocatalytic activity was evaluated using phenol and toluene as water pollutant models. The s-PS nanoporous crystalline phase, able to absorb pollutant molecules, was proven to be necessary to ensure high photocatalytic efficiency as the aerogel acts not only as a support, but also as pollutant pre-concentrator. The reusability of ZnO/s-PS aerogels is also strong showing no decrease in photocatalytic activity after six consecutive degradation trials. Finally, the aerogel matrix prevents ZnO dissolution occurring under acidic conditions and promotes a selective removal of the pollutants. The synergy between the photocatalyst and the innovative polymeric support provides the composite system with robustness, chemical stability, easy recovery after treatment, high efficiency of pollutant removal with a marked selectivity which make these materials promising for large scale applications.

show abstract

Heterogeneous Photocatalytic Oxidation an Effective Tool for Wastewater Treatment – A Review

Cited by 5 publications

References 74 publications

The photocatalytic process in the treatment of polluted water

The photocatalytic process in the treatment of polluted water

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Highly Robust and Selective System for Water Pollutants Removal: How to Transform a Traditional Photocatalyst into a Highly Robust and Selective System for Water Pollutants Removal

Contact Info

Product

Resources

About