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Your search keyword '"Chan, Eng‐Seng"' showing total 89 results
Start Over Author "Chan, Eng‐Seng" Publisher elsevier bv
89 results on '"Chan, Eng‐Seng"'

39. Modified PVA-alginate encapsulated photocatalyst ferro photo gels for Cr(VI) reduction

Author

Ani Idris, Effaliza Misran, Chan Eng Seng, Nursia Hassan, and Aishah Abd. Jalil

Subjects
Chromium, Environmental Engineering, Materials science, Alginates, Health, Toxicology and Mutagenesis, Metal Nanoparticles, Maghemite, Nanoparticle, engineering.material, Bead, Ferric Compounds, Polyvinyl alcohol, Catalysis, Magnetics, chemistry.chemical_compound, Glucuronic Acid, Environmental Chemistry, Waste Management and Disposal, chemistry.chemical_classification, Aqueous solution, Waste management, Hexuronic Acids, Polymer, Photochemical Processes, Pollution, chemistry, Polyvinyl Alcohol, visual_art, Sunlight, Photocatalysis, engineering, visual_art.visual_art_medium, Gels, Oxidation-Reduction, Water Pollutants, Chemical, Nuclear chemistry, Superparamagnetism
Abstract

In this study magnetic separable photocatalyst beads containing maghemite nanoparticles (γ-Fe 2 O 3 ) in polyvinyl alcohol (PVA) polymer were prepared and used in the reduction of Cr(VI) to Cr(III) in an aqueous solution under sunlight. The unique superparamagnetic property of the photocatalyst contributed by the γ-Fe 2 O 3 and robust property of PVA polymer allow the magnetic beads to be recovered easily and reused for at least 7 times without washing. The concentration of γ-Fe 2 O 3 was varied from 8% (v/v) to 27% (v/v) and the results revealed that the beads with 8% (v/v) γ-Fe 2 O 3 exhibited the best performance where Cr(VI) was reduced to Cr(III) in only 30 min under sunlight. The use of the PVA has improved the bead properties and life cycle of beads which is in line with sustainable practices.

Published
2012
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40. Economic assessment of biodiesel production: Comparison of alkali and biocatalyst processes

Author

Pogaku Ravindra, Kenthorai Raman Jegannathan, and Chan Eng-Seng

Subjects
Biodiesel, Immobilized enzyme, biology, Waste management, Renewable Energy, Sustainability and the Environment, Chemistry, Pulp and paper industry, Enzyme catalysis, Catalysis, Biodiesel production, biology.protein, Batch processing, Lipase, Tonne
Abstract

This study deals with the economic assessment of biodiesel production using three catalytic processes (1) alkali (2) soluble enzyme and (3) immobilized enzyme. All the processes were considered to be operated at batch mode with a production capacity of 103 tonne. Biodiesel production cost using alkali catalyst process was found to be lowest ($ 1166.67/tonne) compared to soluble lipase catalyst ($7821.37/tonne) and immobilized lipase catalyst ($2414.63/tonne) process. The higher production cost was due to the higher cost of the enzyme and the higher reaction time of enzymatic process. However, reuse of immobilized catalyst decreased the production cost drastically unlike soluble enzyme catalyst.

Published
2011
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