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Reports from UNIST Describe Recent Advances in Chemical Engineering (Mechanistic investigation on the green recovery of ionic, nanocrystalline, and...

September 10, 2014



Reports from UNIST Describe Recent Advances in Chemical Engineering (Mechanistic investigation on the green recovery of ionic, nanocrystalline, and metallic gold by two anionic nanocelluloses)

By a News Reporter-Staff News Editor at Journal of Engineering -- Investigators publish new report on Chemical Engineering. According to news originating from Ulsan, South Korea, by VerticalNews correspondents, research stated, "The modified cellulose (ADAC samples) used as backbone to obtain biodegradable hydrogels, which demonstrated high affinity to concentrate precious gold species. The primary foci of the study were to develop green techniques to recover Au from dilute solutions by providing the mechanistic evidences for the adsorption coupled reduction pathways."

Our news journalists obtained a quote from the research from UNIST, "The derivatives of anionic nanocellulose were used for recovery of the ionic, nanoparticulate, and metallic forms of Au. The ADAC samples were promising sorbing phase (57 and 60 mg/g capacity) even at low pH for the treatment of the gold-polluted waters. Thermodynamically, ADAC hydrogels were remained active at moderate to higher temperature (295-333 K) in an endothermic way. Reduction of Au occurred at different stages of kinetic curves, facilitating the formation of zerovalent gold (48 and 41 nm particle size). The Au recovery minimally altered by the competing heavy metals (Cd, Co, Cr, Ni, and As), either at equivalent or lower concentrations. A significant amount of Au(III) (83-99%) regenerated by a strong complexing eluent (0,5 M thiourea in 1 M HCl), moreover thermal crystallization yielded metallic gold in an excellent amount (94%). The mechanism of adsorptive-reduction of gold-nanocellulose were investigated and characterized by the spectroscopic studies including X-ray photoelectron spectroscopy."

According to the news editors, the research concluded: "Overall, recovery of gold in desired forms from nanocellulose can be viewed as an effective biomaterial management strategy."

For more information on this research see: Mechanistic investigation on the green recovery of ionic, nanocrystalline, and metallic gold by two anionic nanocelluloses. Chemical Engineering Journal, 2014;253():316-324. Chemical Engineering Journal can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Chemical Engineering Journal - www.elsevier.com/wps/product/cws_home/601273)

The news correspondents report that additional information may be obtained from A.D. Dwivedi, UNIST, Sch Urban & Environm Engn, Ulsan 698805, South Korea. Additional authors for this research include S.P. Dubey, S. Hokkanen and M. Sillanpaa.

Keywords for this news article include: Ulsan, South Korea, Asia, Chemical Engineering

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


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Source: Journal of Engineering


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