Impact of water quality parameters on the sorption of U(VI) onto hematite.
In this study, the sorption of U(VI) from aqueous solution on hematite was studied as a function of various water quality parameters such as contact time, pH, ionic strength, soil humic acid (HA) or fulvic acid (FA), solid content and temperature by using a batch technique. The results demonstrated that the sorption of U(VI) was strongly dependent on ionic strength at pH<6.0, and outer-sphere surface complexation may be the main sorption mechanism. The sorption was independent of ionic strength at pH>6.0 and the sorption was mainly dominated by inner-sphere surface complexation. The presence of HA/FA increases U(VI) sorption at low pH, whereas decreases U(VI) sorption at high pH. The thermodynamic parameters (ΔH⁰, ΔS⁰, and ΔG⁰) were calculated from the temperature dependent sorption isotherms, and the results suggested that U(VI) sorption was a spontaneous and endothermic process. The results might be important for the application of hematite in U(VI) pollution management.
School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei 230601, PR China.
Donglin
D
Zhao
Xianbiao
X
Wang
Shitong
S
Yang
Zhiqiang
Z
Guo
Guodong
G
Sheng
D000327:Adsorption; D001578:Benzopyrans / Q000032:analysis; D002254:Carbonates / Q000032:analysis; D052918:Environmental Restoration and Remediation / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D012987:Soil / Q000032:analysis; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013997:Time Factors; D014501:Uranium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D060753:Water Quality; D014961:X-Ray Diffraction
D001578:Benzopyrans; D002254:Carbonates; D005290:Ferric Compounds; D006812:Humic Substances; D012987:Soil; D014867:Water; C000499:ferric oxide; D014501:Uranium; C005023:fulvic acid