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New Chalcogens Findings from Toyo University Described (Decolorization of dark brown colored coffee effluent using zinc oxide particles: the role of...

July 29, 2014



New Chalcogens Findings from Toyo University Described (Decolorization of dark brown colored coffee effluent using zinc oxide particles: the role of dissolved oxygen in degradation of colored compounds)

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Chalcogens. According to news reporting originating from Kawagoe, Japan, by NewsRx correspondents, research stated, "The degradation of model dark brown colored coffee effluent using photocatalyst zinc oxide (ZnO) has been systematically studied by varying ZnO dosage from 0 to 4000 mg L(-1), coffee loading from 0 to 90 mg L(-1) and intensity of UV light having the radiation peak at 352 nm from 0 to 18 W(m-lamp length)(-1). Almost complete decolorization was achieved after 180 min for the initial coffee concentration of 50 mg L(-1) with ZnO dosage of 3000 mg L(-1) and three UV lamps."

Our news editors obtained a quote from the research from Toyo University, "The dissolved oxygen (DO) largely affected the photodecolorization process. Without air sparging or with oxygen supply only through the free-surface, the DO concentration significantly decreased during the initial decolorization process and then increased to the saturated DO concentration after about 80% decolorization was achieved. Under the anoxic condition with nitrogen gas sparging, the efficient color removal was not obtained unlike the decolorization without air sparging or under the oxic condition with air sparging. These findings suggest that the change in DO concentration was controlled by the oxygen consumption for the formation of oxygen adduct intermediates such as organoperoxy radicals. The mineralization rate of model coffee effluent was rather slow as compared with the decolorization rate and it was insignificantly affected by anoxic and oxic conditions."

According to the news editors, the research concluded: "The present results indicate that ZnO photocatalyst has potential for treatment of coffee processing wastewaters."

For more information on this research see: Decolorization of dark brown colored coffee effluent using zinc oxide particles: the role of dissolved oxygen in degradation of colored compounds. Journal of Environmental Management, 2014;139():172-9. (Elsevier - www.elsevier.com; Journal of Environmental Management - www.elsevier.com/wps/product/cws_home/622871)

The news editors report that additional information may be obtained by contacting H. Satori, Research Center for Biochemical and Environmental Engineering, Dept. of Applied Chemistry, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan (see also Chalcogens).

Keywords for this news article include: Kawagoe, Japan, Asia, Chalcogens, Chemicals, Chemistry, Emerging Technologies, Nanotechnology, Photocatalyst, Photocatalytic, Zinc Compounds, Zinc Oxide.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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