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Materials 2017, 10(6), 636;

Recovery of Silver Using Adsorption Gels Prepared from Microalgal Residue Immobilized with Functional Groups Containing Sulfur or Nitrogen

Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo-machi 1, Saga 840-8502, Japan
Research Laboratories, Denso Corparation, Komenoki 500-1, Minamiyama, Nisshin, Aichi 470-0111, Japan
Department of Chemical and Biological Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada
Author to whom correspondence should be addressed.
Received: 16 May 2017 / Revised: 7 June 2017 / Accepted: 7 June 2017 / Published: 10 June 2017
(This article belongs to the Special Issue Sorption Materials for Environment Purification)
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Although biodiesel oil extracted from microalgae attracts much attention as one of the most promising green energies, its high production cost is a big problem, impeding its extensive use. In order to lower the production cost, the effective use of microalgal residue after extracting biofuel was investigated as a feed material of functional materials. In the present work, a new adsorbent for silver(I) was prepared by immobilizing functional groups of polyethylene-polyamine or dithiooxamide, which exhibita high affinity for soft Lewis acids such as silver(I) ions. Their adsorption behaviors for silver(I) were investigated from aqueous nitrate and acidothiourea media. The effects of the concentrations of nitrate and thiourea, as well as of sulfuric acid, were qualitatively interpreted. From the study of adsorption isotherms on these gels, they were found to exhibita higher adsorption capacity than the majority of those reported to date. View Full-Text
Keywords: adsorption; silver(I); microalgal residue; biofuel; chemical modification adsorption; silver(I); microalgal residue; biofuel; chemical modification

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Khunathai, K.; Inoue, K.; Ohto, K.; Kawakita, H.; Kurata, M.; Atsumi, K.; Fukuda, H.; Alam, S. Recovery of Silver Using Adsorption Gels Prepared from Microalgal Residue Immobilized with Functional Groups Containing Sulfur or Nitrogen. Materials 2017, 10, 636.

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