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RISS 인기검색어
- 검색키워드
- 저자 : Henry Agbe (검색결과 3 건)
- 무료
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Recent advances in photoinduced catalysis for water splitting and environmental applications
Henry Agbe,Emmanuel Nyankson,Nadeem Raza,David Dodoo-Arhin,Aditya Chauhan,Gabriel Osei,Vasant Kumar,김기현 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
To secure reliable alternative energy sources, the up-conversion of solar energy into storable chemicalenergy holds promise. This review is organized to highlight recent advances in thefields of solar energyutilization and conversion methods with the aid of various heterogeneous catalysts. Special emphasis hasbeen placed on TiO2 photoanode catalysts, band-gap engineering, TiO2-coupled light-harvestingmolecules, and photon-coupled electron transfer via electron transport mediator systems. Furthermore,the coverage of this review extends to the topics of oxygen evolution catalysts, water reduction catalysts,and a system assembly capable of completing the four-electron water-oxidation reaction for efficientphotocatalytic water splitting.
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Multistep sequestration and storage of CO<sub>2</sub> to form valuable products using forsterite
Raza, Waseem,Raza, Nadeem,Agbe, Henry,Kumar, R.V.,Kim, Ki-Hyun,Yang, Jianhua Elsevier 2018 ENERGY Vol.155 No.-
<P><B>Abstract</B></P> <P>The potential use of mineralogical carbonation is greatly acknowledged not only in reducing CO<SUB>2</SUB> emissions through carbon capture and storage (CCS) but also in producing industrially viable products. The direct carbonation of stable silicate minerals by supercritical CO<SUB>2</SUB> is unrealistic due to the low conversion efficiencies. The natural abundance of silicate minerals (e.g., olivine) is theoretically sufficient to fix the entire quantity of man-made CO<SUB>2</SUB> emissions, while carbonation of sorbents obtained from the dissolution of silicate rocks could proceed in a multistep (or continuous) process. In this work, the optimum experimental conditions for a multistep procedure of sequestration of minerals and conversion of CO<SUB>2</SUB> into valuable products were investigated using synthetic forsterite. In this research, magnesium sulfate obtained from the dissolution of forsterite in aqueous H<SUB>2</SUB>SO<SUB>4</SUB> was successfully carbonated to produce valuable byproducts (e.g., silica and hydrates of magnesite) with an economical carbonation as a means of CO<SUB>2</SUB> mitigation. Hydromagnesite, while being commercially applied in various fields (e.g., fire retardation and catalysis), can be transformed to magnesite which is stable for millions of years.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The carbonation of synthetic forsterite can be achieved via multistep reaction pathways. </LI> <LI> Through such conversion, the complete set of valuable products can be produced. </LI> <LI> This approach can effectively mitigate CO<SUB>2</SUB> through the formation of valuable products. </LI> <LI> In this work, optimum reaction conditions for such conversion has been sought. </LI> </UL> </P>
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Nadeem Raza,김기현,Henry Agbe,Suresh Kumar Kailasa,Jan E. Szulejko,Richard J. C. Brown 한국대기환경학회 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.11 No.4
Indoor air pollutants can cause severe health problems, specifically in terms of toxicological impacts on human. Every day, a complex mixture of many air pollutants is emitted from various sources and subject to atmospheric processes that can create varied classes of pollutants such as carboxylic acids, aldehydes, ketones, peroxyacetyl nitrate, and hydrocarbons. To adhere to indoor air quality standards, a number of techniques such as photocatalytic oxidation of various volatile organic compounds (VOCs) have been employed. Among these techniques, titania (TiO2) based photocatalytic reactions have proven to be the best benchmark standard approach in the field of environmental applications. Over the last 45 years, TiO2-based photocatalytic reactions have been explored for the degradation of various pollutants. This review discusses the indoor air quality profile, types of indoor pollutants, available indoor air cleaning approaches, and performance of TiO2- based catalysts. Finally, we have presented the perspectives on the progress of TiO2 induced photocatalysis for the purification of indoor air.
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