title: Regeneration of Aqueous Periodate Solutions by Ozone Treatment: A Sustainable Approach for Dialdehyde Cellulose Production.
abstract: A method for easy and fast regeneration of aqueous periodate solutions from dialdehyde cellulose (DAC) production by ozone treatment is presented, along with a direct and reliable simultaneous quantification of iodate and periodate by reversed-phase HPLC. The influence of iodate and ozone concentration, solution pH, and reaction time on the regeneration efficiency was studied, as well as the reaction kinetics. Regeneration of spent periodate solutions by ozone was successfully performed in alkaline medium, which favors the formation of free (.) OH radicals, as supported by the addition of radical scavengers and quantum mechanical calculations. At pH 13 and an ozone concentration of approximately 150 mg L(-1) , periodate was completely regenerated from a 100 mm solution of iodate within 1 h at room temperature. A cyclic process of cellulose oxidation and subsequent regeneration of spent periodate with 90 % efficiency has been developed. So far, commercial applications of DAC have been hampered by difficulties in reusing the costly periodate. This work overcomes this hurdle and presents a highly efficient, clean, and low-cost protocol for the preparation of DAC with integrated periodate recycling, with the possibility of scaling the process up.
authors.affiliation: University of Natural Resources and Life Sciences (BOKU), Department of Chemistry, Division of Chemistry of Renewable Resources, UFT Campus Tulln, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria.
authors.forename: Slavica
authors.initials: S
authors.lastname: Koprivica
authors.affiliation: University of Natural Resources and Life Sciences (BOKU), Department of Chemistry, Division of Chemistry of Renewable Resources, UFT Campus Tulln, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria.
authors.forename: Martin
authors.initials: M
authors.lastname: Siller
authors.affiliation: University of Natural Resources and Life Sciences (BOKU), Department of Chemistry, Division of Chemistry of Renewable Resources, UFT Campus Tulln, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hosoya
authors.affiliation: Kelheim Fibres GmbH, Regensburger Straße 109, 93309, Kelheim, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Roggenstein
authors.affiliation: University of Natural Resources and Life Sciences (BOKU), Department of Chemistry, Division of Chemistry of Renewable Resources, UFT Campus Tulln, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Rosenau
authors.affiliation: University of Natural Resources and Life Sciences (BOKU), Department of Chemistry, Division of Chemistry of Renewable Resources, UFT Campus Tulln, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria. antje.potthast@boku.ac.at.
authors.forename: Antje
authors.identifier: 0000-0003-1981-2271
authors.initials: A
authors.lastname: Potthast
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D006863:Hydrogen-Ion Concentration; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D010504:Periodic Acid / Q000737:chemistry*; D059027:Recycling; D012996:Solutions
chemical_list: D016877:Oxidants; D012996:Solutions; D010504:Periodic Acid; D010126:Ozone; D002482:Cellulose; C058684:2,3-dialdehydocellulose; C009288:metaperiodate
keywords: biomass; iodine; ozone; radicals; reaction mechanisms