Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
J Colloid Interface Sci. 2011 Nov 1;363(1):320-6. doi: 10.1016/j.jcis.2011.07.026. Epub 2011 Jul 23.
Antimony is a regulated pollutant to be well controlled. This study compared the removal capability and mechanisms involved in the removal of Sb(III) by Fe-Mn Binary Oxide (FMBO), ferric hydroxide (FeOOH), and manganese dioxide (MnO(2)). FMBO shows a maximum Sb removal capacity of 1.76 mmol/g and was much higher than that of both FeOOH (0.83 mmol/g) and MnO(2) (0.81 mmol/g). Characterization techniques of FTIR and XPS indicated the different variation trends of functional groups, surface elemental composition, and chemical valence of Fe, Mn, and Sb after the adsorption of Sb(III) on these three adsorbents. As for FMBO, results indicated that the manganese oxide dominated in oxidation of Sb(III) to Sb(V) whereas the iron oxide adsorbed the Sb(III) and Sb(V). The oxidation and sorption mechanism was proposed to involve in the removal of Sb(III) by FMBO. FMBO may be promisingly used to remove Sb from drinking water and wastewater.
锑是一种受管制的污染物，需要进行有效控制。本研究比较了 Fe-Mn 二元氧化物（FMBO）、氢氧化铁（FeOOH）和二氧化锰（MnO2）去除 Sb(III)的能力和相关机制。FMBO 对 Sb(III)的最大去除容量为 1.76mmol/g，明显高于 FeOOH（0.83mmol/g）和 MnO2（0.81mmol/g）。FTIR 和 XPS 等特征技术表明，在 Sb(III)被这三种吸附剂吸附后，功能基团、表面元素组成和 Fe、Mn、Sb 的化学价态表现出不同的变化趋势。对于 FMBO，结果表明，二氧化锰主导 Sb(III)氧化为 Sb(V)，而氧化铁吸附 Sb(III)和 Sb(V)。提出了氧化和吸附机制来解释 FMBO 去除 Sb(III)的过程。FMBO 有望用于去除饮用水和废水中的 Sb。
