摘要
A Fe-Zr binary oxide adsorbent has been successfully synthesized using a co-precipitation method. It showed a better performance for antimonate （Sb（V）） removal than zirconium oxide or amorphous ferric oxide. The experimental results showed that the Fe-Zr adsorbent has a capacity of 51 mg/g at an initial Sb（V） concentration of 10 mg/L at pH 7.0. Sb（V） adsorption on the Fe-Zr bimetal oxide is normally an endothermic reaction. Most of the Sb（V） adsorption took place within 3 hr and followed a pseudo second-order rate law. Co-existing anions such as SO42-, NO3 and C1- had no considerable effects on the Sb（V） removal; PO3- had an inhibitory effect to some extent at high concentration; while CO2- and SiO4- showed significant inhibitory effects when they existed in high concentrations. The mechanism of Sb（V） adsorption on the adsorbent was investigated using a combination of zeta potential measurements, XPS, Raman, FT-IR observations and SO42- release determination. The ionic strength dependence and zeta potential measurements indicated that inner-sphere surface complexes were formed after Sb（V） adsorption. Raman and XPS observations demonstrated that both Fe-OH and Zr-OH sites at the surface of the Fe-Zr adsorbent play important roles in the Sb（V） adsorption. FT-IR characterization and SO42- release determination further demonstrated that the exchange of SO2- with Sb（V） also could promote the adsorption process. In conclusion, this adsorbent showed high potential for future application in Sb（V） removal from contaminated water.
A Fe-Zr binary oxide adsorbent has been successfully synthesized using a co-precipitation method. It showed a better performance for antimonate （Sb（V）） removal than zirconium oxide or amorphous ferric oxide. The experimental results showed that the Fe-Zr adsorbent has a capacity of 51 mg/g at an initial Sb（V） concentration of 10 mg/L at pH 7.0. Sb（V） adsorption on the Fe-Zr bimetal oxide is normally an endothermic reaction. Most of the Sb（V） adsorption took place within 3 hr and followed a pseudo second-order rate law. Co-existing anions such as SO42-, NO3 and C1- had no considerable effects on the Sb（V） removal; PO3- had an inhibitory effect to some extent at high concentration; while CO2- and SiO4- showed significant inhibitory effects when they existed in high concentrations. The mechanism of Sb（V） adsorption on the adsorbent was investigated using a combination of zeta potential measurements, XPS, Raman, FT-IR observations and SO42- release determination. The ionic strength dependence and zeta potential measurements indicated that inner-sphere surface complexes were formed after Sb（V） adsorption. Raman and XPS observations demonstrated that both Fe-OH and Zr-OH sites at the surface of the Fe-Zr adsorbent play important roles in the Sb（V） adsorption. FT-IR characterization and SO42- release determination further demonstrated that the exchange of SO2- with Sb（V） also could promote the adsorption process. In conclusion, this adsorbent showed high potential for future application in Sb（V） removal from contaminated water.
基金
supported by the Fundamental Research Funds for the Central Universities (No. YX-2010-33)
the Major Projects on Control and Rectification of Water Body Pollution (No. 2008ZX07422-002-004)
the Beijing Nova Program (No. 2008A33)
