title: TEMPO-oxidized cellulose hydrogel as a high-capacity and reusable heavy metal ion adsorbent.
abstract: Nitroxy radical catalyzed oxidation with hypochlorite/bromide (TEMPO-mediated oxidation) was performed on a cellulose hydrogel prepared using LiOH/urea solvent. TEMPO oxidation successfully introduced carboxyl groups onto the surface of the cellulose hydrogel with retention of the gel structure and its nanoporous property. The equilibrium measurement of Cu(2+) adsorption showed favorable interaction with Cu(2+) and high maximum adsorption capacity. In addition, over 98% of the adsorbed Cu(2+) was recovered using acid treatment, and the subsequent washing allowed the TEMPO-oxidized gels to be used repeatedly. Furthermore, the TEMPO-oxidized cellulose hydrogel showed high adsorption capacity for other toxic metal ions such as Zn(2+), Fe(3+), Cd(2+), and Cs(+).
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Isobe
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Chen
authors.forename: Ung-Jin
authors.initials: UJ
authors.lastname: Kim
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kimura
authors.forename: Masahisa
authors.initials: M
authors.lastname: Wada
authors.forename: Tsuguyuki
authors.initials: T
authors.lastname: Saito
authors.forename: Akira
authors.initials: A
authors.lastname: Isogai
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis; D002482:Cellulose / Q000737:chemistry*; D002586:Cesium / Q000032:analysis; D019245:Compressive Strength; D003300:Copper / Q000737:chemistry*; D003497:Cyclic N-Oxides; D020100:Hydrogels / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000032:analysis; D019216:Metals, Heavy / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D012997:Solvents; D062065:Wastewater; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods; D015032:Zinc / Q000032:analysis
chemical_list: D002104:Cadmium; D002482:Cellulose; D002586:Cesium; D003300:Copper; D003497:Cyclic N-Oxides; D020100:Hydrogels; D006859:Hydrogen; D007477:Ions; D007501:Iron; D019216:Metals, Heavy; D009584:Nitrogen; D012997:Solvents; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical; D015032:Zinc; C003959:TEMPO
keywords: Adsorbent; Cellulose hydrogel; Heavy metal ion; TEMPO-mediated oxidation