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 e...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.展开更多
本文通过对含锆熔铁催化剂的红外光谱分析与讨论,发现二氧化锆对铁酸钾和四氧化三铁的特征 IR 吸收有较大影响,进而揭示了在二氧化铬与四氧化三铁相界间存在静电吸引作用,由于这种静电吸引作用,削弱了铁氧键的强度,从而促进了熔铁催化...本文通过对含锆熔铁催化剂的红外光谱分析与讨论,发现二氧化锆对铁酸钾和四氧化三铁的特征 IR 吸收有较大影响,进而揭示了在二氧化铬与四氧化三铁相界间存在静电吸引作用,由于这种静电吸引作用,削弱了铁氧键的强度,从而促进了熔铁催化剂的还原。另外我们还发现在催化剂的制备过程中可能有锆酸钾的生成,而氧化铝的存在却能抑制这种物质的产生。展开更多
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)
文摘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.
文摘本文通过对含锆熔铁催化剂的红外光谱分析与讨论,发现二氧化锆对铁酸钾和四氧化三铁的特征 IR 吸收有较大影响,进而揭示了在二氧化铬与四氧化三铁相界间存在静电吸引作用,由于这种静电吸引作用,削弱了铁氧键的强度,从而促进了熔铁催化剂的还原。另外我们还发现在催化剂的制备过程中可能有锆酸钾的生成,而氧化铝的存在却能抑制这种物质的产生。
