Photocatalysis: Past, Present and Future Trends for Remediation of Wastewater (original) (raw)
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2016
During recent years, many advanced oxidation techniques have been investigated for water and wastewater treatment to overcome the shortage of clean water. This review summarizes the background and principles of photocatalysis applied as an advanced oxidation technology. In particular, this paper focuses on modification of photocatalysts with various dopants as well as the novel photocatalytic reactors to improve the oxidation efficiency of the pollutants in water and wastewater.
New Perspectives in Photocatalytic Water Treatment
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This Special Issue, entitled “New Perspectives in Photocatalytic Water Treatment”, was planned to cover all relevant topics related to photo-initiated oxidative processes in water treatment, with a special emphasis on pollutant abatement and microorganism inactivation, which were required for improving their practical uses [...]
Case Studies in Chemical and Environmental Engineering, 2024
The presence of persistent organic compounds in wastewater poses significant challenges to both biotic community and natural environment, resulting in a severely adverse effect on the ecosystem. In view of the urgent scenarios, the removal of pollutants from wastewater effluent has a significant potential to restore ecological equilibrium and maintain the social value of sustainability. Among the various methods used for wastewater treatment, photocatalytic advanced oxidation processes have gained as a viable and promising alternative approach. The objective of this review paper is to provide a comprehensive exploration of the various photocatalytic materials used in wastewater treatment with potential scopes for future enhancements. Further, various factors affecting the removal of pollutants from wastewater are highlighted. In particular, the selection, design aspects and scaleup criteria of photocatalytic reactors could assist in the establishment of commercial scale process. This review stimulates research on the kinetic study in order to get a deeper understanding of the mechanisms involved in the formation of novel photo-catalyst materials. Thus, photo catalytic advanced oxidation process could become as a spectacular treatment method for wastewater.
Water Science and Technology
Oilfield-produced water is the primary by-product generated during oil and gas extraction operations. Oilfield-produced water is often severely toxic and poses substantial health, safety, and environmental issues; adequate treatment technologies must bring these streams to a quality level. Photocatalysis is a photochemical catalytic reaction that is a highly promising tool for environmental remediation due to its efficiency in mineralizing persistent and potentially toxic contaminants. However, there is limited understanding of its application to treating oilfield-produced water with a complex and highly variable water composition. This review article discusses the mechanisms and current state of heterogeneous photocatalytic systems for oilfield-produced water treatment, highlighting impediments to knowledge transfer, including the feasibility of practical applications and the identification of essential research requirements. Additionally, the effects of significant variables such ...
2016
Heterogeneous photocatalysis is a promising technology especially for environmental remediation. Despite more than a decade of worldwide research in developing photocatalytic efficiency improving techniques, many questions regarding the large scale application of photocatalytic reactors still remain unanswered. Recently, improving the photocatalytic efficiency has gained scientific attention because it might lead to more economical and robust photocatalytic operation for environmental remediation. In this review, fundamental and comprehensive assessments of the photocatalytic concepts and their applications for environmental remediation are reviewed. The existing challenges and strategies to improve the photocatalytic efficiency are discussed. Further, recent developments and future research prospects on photocatalytic systems for environmental applications are also addressed.
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In recent decades, ultraviolet-assisted advanced oxidation processes (UV-AOPs) have been successfully applied to remove a wide range of contaminants from polluted water. Despite this, their extended use on an industrial scale is still far from being a reality, largely limited by the operational costs that these processes still entail. In recent years, many researchers have been working to increase UV-AOP efficiency and reduce capital and operating costs. This work aims to review different strategies devoted to the intensification of UV-AOPs. Firstly, the optimization of operational parameters, such as catalyst loading, pH, temperature, or oxidant concentration, has been reviewed as a strategy to augment the efficiency of the photocatalytic processes and reduce reagent consumption and/or treatment time. The review also discusses the development of photocatalytic materials to intensify the UV-AOPs process, and finally, the combination or integration of different UV-AOPs for the treatm...
Application Photocatalysis for Treatment of Industrial Waste Water—A Short Review
OALib, 2014
Occurrence of persistent organic compounds in industrial effluents and their efficient removal technique has emerged as a crucial problem to waste water treatment plants. This review aims to focus on the plight associated with the effluents from textile industry, agricultural and pharmaceutical effluents. The occurrence of dyes, pesticides and endocrine disrupting chemicals in aquatic ecosystems may cause chronic diseases, affect the human endocrine system and have appeared as crucial factor to consider for drinking and non-potable end uses of water. Extensive researches have been attempted to screen effective and safe method of contaminants removal by modifying conventional treatments as well as advanced processes by renowned authors. This paper aims to review different possible routes of effluent treatment emphasizing on complete mineralization of the targeted contaminants. With this purpose, a comprehensive review has been presented to deliver essential information about dealing with photocatalytic mineralization of pollutants.
Evaluation and testing of a novel photocatalytic reactor with model water pollutants
2007
Semiconductor photocatalysis is a newly emerging technology for the elimination of harmful chemical compounds from air and water. It couples low-energy ultraviolet light with semiconductors acting as photocatalyst and thereby overcoming many of the drawbacks that exist for the traditional water treatment methods. Recent literature has v ACKNOWLEDGEMENT My profound gratitude goes to almighty Allah for His infinite mercy and protection throughout the duration of the study. I would like to show deep appreciation to my supervisors, Dr. Cathy McCullagh and Prof. Pat. Pollard for their unrelenting support and invaluable guidance throughout the research work. They have made my time here both productive and enjoyable. I could not have had better supervision and consider myself lucky to have to work with them. I would also like to extend thanks to Prof. Peter Robertson and Dr. Stephine Rigby for the supervision of the initial stages of the study. Special thanks go to Morgan Adams, Simon Officer, and Pradbhu Radhakrishna for many intriguing discussion and consultations during the research. I also thank Dorothy McDonald and Martin Simpson for the administrative assistance on the research.