Characteristics of cobalt adsorption on prepared TiO{sub 2} and Fe-Ti-O adsorbents in high temperature water

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496399508015410· OSTI ID:70278

Kim, Kwang-Rag ^[1]; Lee, Kun-Jai ^[2]; Bae, Jae-Heum ^[3]

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1. Korea Atomic Energy Research Institute, Taejon (Korea, Democratic People`s Republic of)
2. Korea Advanced Institute of Science and Technology, Taejon (Korea, Democratic People`s Republic of)
3. Univ. of Suwon (Korea, Democratic People`s Republic of)

TiO{sub 2} and Fe-Ti-O adsorbents were prepared by hydrolysis of Ti(OC{sub 3}H{sub 7}){sub 4} and by alkalizing an equimolar mixed solution of TiCl{sub 4} and FeCl{sub 2}, followed by heat treatment of their hydroxides. Their structures were studied by X-ray diffractometry and TG-DTA. The Co{sup 2+} adsorption characteristics of the adsorbent in high temperature water were investigated in a stirred autoclave. The prepared Fe-Ti-O adsorbent was found to be a stable nonstoichiometric ferrous/ferric titanium oxide with pseudobrookite and rutile structures. The Co{sup 2+} adsorption capacity of the Fe-Ti-O adsorbent was determined to be larger (0.38 meq Co{sup 2+}/g adsorbent at 280{degrees}C) than that of TiO{sub 2} at high temperature. The enthalpy changes ({Delta}H{degrees}) of about 34 and 49 kJ{center_dot}mol{sup {minus}1} due to the adsorption of Co{sup 2+} on the TiO{sub 2} and Fe-Ti-O adsorbents, respectively, indicates that the adsorption is endothermic in the experimental temperature range (150-280{degrees}C). It is shown that the specific surface areas of these adsorbents are not dominant factors for Co{sup 2+} adsorption on oxides at high temperature.

• Sponsoring Organization: USDOE
• OSTI ID: 70278
• Journal Information: Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 6 Vol. 30; ISSN 0149-6395; ISSN SSTEDS
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ADSORPTION
ADSORPTION HEAT
CHEMICAL PREPARATION
COBALT
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
IRON OXIDES
SORPTIVE PROPERTIES
SPECIFIC SURFACE AREA
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM OXIDES
X-RAY DIFFRACTION