title: Potassium iodate assisted synthesis of titanium dioxide nanoparticles with superior water-dispersibility.
abstract: In this paper, we report a novel polyol process to synthesize highly water-dispersible anatase titanium dioxide (TiO2) nanoparticles (∼5 nm) by the introduction of inorganic oxidizing agent--KIO3. The obtained TiO2 nanoparticles are well dispersible in water at pH≥5.0 and the resulting aqueous dispersion remains stable over months. The superior water-dispersibility of as-formed TiO2 is ascribed to the electrostatic repulsion from carboxylic acid group modified on TiO2 nanoparticles, which is the oxidation product of solvent diethylene glycol (DEG) by KIO3. Based on the characterization results, the formation processes of water-dispersibility TiO2 nanoparticles are proposed. Meanwhile, the synthesized TiO2 nanoparticles are found to be doped by iodine and exhibit excellent photocatalytic activity on degradation of rhodamine-B (RhB) under visible-light irradiation. The further tests demonstrate that the O(2-) is the main active species during photodegradation of RhB.
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
authors.forename: Yawen
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Duo
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
authors.forename: Shiqi
authors.initials: S
authors.lastname: Peng
authors.affiliation: Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China. Electronic address: fljia@mail.ccnu.edu.cn.
authors.forename: Falong
authors.initials: F
authors.lastname: Jia
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
authors.forename: Caimei
authors.initials: C
authors.lastname: Fan
mesh_terms: D002384:Catalysis; D007452:Iodates / Q000737:chemistry*; D008027:Light; D053758:Nanoparticles / Q000737:chemistry*; D055668:Photochemical Processes; D017680:Potassium Compounds / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D007452:Iodates; D017680:Potassium Compounds; D012235:Rhodamines; D014867:Water; C009495:titanium dioxide; D014025:Titanium; C039693:potassium iodate; C029773:rhodamine B
keywords: Iodine-doped; Polyol process; Titanium dioxide; Water-dispersibility