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1993년 농업 식품 화학저널에 발표된 음료수 속 벤젠 현성작용에 대한 외국 논문 자료입니다. -여성환경연대(2005년)
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1993년 농업 식품 화학저널에 발표된 음료수 속 벤젠 현성작용에 대한 외국 논문 자료입니다. -여성환경연대(2005년)
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Clay is a fine grained natural rock or soil material that combines one or more clay minerals with traces of metal oxide and organic matter found abundantly on earth’s crust. Chemically it consists essentially of hydrated silicates of aluminum. Generally clays are used as solid acid catalysts, which can function as both Bronsted and Lewis acids in their natural and ion-exchanged form and also known as radical catalyst. Using clay catalysts, environmentally benign green chemistry can be done both at industrial and laboratory scale.The objective of this work is to study the behavior of calcium bentonite clay treated with sulfuric acid of 3N concentration under mechanical stirring and refluxing condition separately.The XRF and SEM studies indicated clearly the leaching and disintegration of the clay sheet upon thermo-chemical treatment. XRD studies of the acid treated clay indicated the structural transformation of the clay sheet upon acid treatment and became amorphous . As the treatment of 3N sulfuric acid chemically and thermo-chemically occur, Al2O3, TiO2 and Na2O contents in the acid treated material decreased progressively simultaneously increasing the SiO2 content. FTIR study of the acid treated clay shows that the acid treatment did not cause much variation in the peak pattern, however thermo-acid treatment in same acid strength the peak intensity was found to decrease progressively and indicating the dehydroxylation and successive leaching of the Al ions from the octahedral layer. Again, the BET surface area analysis of the samples indicated that method can be useful for manufacturing a surface active and high surface area material which can be used for catalyst as well as an adsorbent.
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Clay is a fine grained natural rock or soil material that combines one or more clay minerals with traces of metal oxide and organic matter found abundantly on earth’s crust. Chemically it consists essentially of hydrated silicates of aluminum. Generally clays are used as solid acid catalysts, which can function as both Bronsted and Lewis acids in their natural and ion-exchanged form and also known as radical catalyst. Using clay catalysts, environmentally benign green chemistry can be done both at industrial and laboratory scale.The objective of this work is to study the behavior of calcium bentonite clay treated with sulfuric acid of 3N concentration under mechanical stirring and refluxing condition separately.The XRF and SEM studies indicated clearly the leaching and disintegration of the clay sheet upon thermo-chemical treatment. XRD studies of the acid treated clay indicated the structural transformation of the clay sheet upon acid treatment and became amorphous . As the treatment of 3N sulfuric acid chemically and thermo-chemically occur, Al2O3, TiO2 and Na2O contents in the acid treated material decreased progressively simultaneously increasing the SiO2 content. FTIR study of the acid treated clay shows that the acid treatment did not cause much variation in the peak pattern, however thermo-acid treatment in same acid strength the peak intensity was found to decrease progressively and indicating the dehydroxylation and successive leaching of the Al ions from the octahedral layer. Again, the BET surface area analysis of the samples indicated that method can be useful for manufacturing a surface active and high surface area material which can be used for catalyst as well as an adsorbent.
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Slide
1.
ABRASION
2.
CARBONIC ACID
3.
Chemical weathering
4.
exfolation
5.
c
6.
7.
Physical weathering
8.
weathering
9.
By Gabriel
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