Adsorption of Phosphate Ions by the Titanium(IV) Oxide Monohydrate-Active Carbon Complex

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Bibliographic Information

Other Title
  • 酸化チタン(IV)-水和物と活性炭との複合体によるリン酸イオンの吸着
  • 酸化チタン（ＩＶ）―水和物と活性炭との複合体によるりん酸イオンの吸着

Description

The adsoption of phosphate ions by a complex of titanium (IV) oxide monohydrate (metatitanic acid) and active carbon was investigated. A sulfuric acid solution of TiOSO4 (TiO2 250g, H2SO4 1044 g /l) formed as an intermediate product during t he production of titanium ox ide ( IV) was used as a staring material for metatitanic acid. The complex was prepared by the following method: A suitable amount of the sulfuric acid solution of TiOSO4 was mixed w ith active carbon. The mixture was heated to 180°C f or the removal of excess amount of sulf uric acid. The titanium(IV) oxide sulfate deposited on the active carbon was hydolyzed into metatitanic acid by washing with water, and the product was dried. A complex obtained u nder suitable conditions (5 m l TiOSO4 solution/10 g active carbon) showed an adsorption cap acity comparable to that of a commercially available metatitanic acid (in Freundlich equatio n; q=kc1/n, k was equal to 17-19 mg PO43-/g adsorbent)., The amount of phosphate ion adsorb ed per unit amount of metatitanic acid contained in the complex was about ten times as large as that of a commercially available one. The complex adsorbed condensed phosphate ions. Th e slope of isotherm was 0.116 in the case of orthophosphate ion and 0.2 61 in the case of trip hosphate ion. By means of the active carbon as a carrier, the complex adsorbed Meth ylene Blue, iodine and phenol. The adsorption capacity of the complexes of these substanc es, however, decreased with the increase of the ratio of TiOSO4 solution (ml) to the active carbon (g). In column tests, phosphate ion adsorbed on the complex were elluted with 2 N sodium hyd roxide, and the adsorbent was regenerated by an acid.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1981 (8), 1319-1325, 1981-08-10

    The Chemical Society of Japan

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