负载于硅藻土上的铁锰二元氧化物作为去除亚砷酸盐的吸附剂：制备与评价
Fe-Mn binary oxide incorporated into diatomite as an adsorbent for arsenite removal: preparation and evaluation.
作者信息
Chang Fangfang, Qu Jiuhui, Liu Huijuan, Liu Ruiping, Zhao Xu
机构信息
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
J Colloid Interface Sci. 2009 Oct 15;338(2):353-8. doi: 10.1016/j.jcis.2009.06.049. Epub 2009 Jun 26.
Fe-Mn binary oxide incorporated into diatomite (FMBO-diatomite) was prepared by a simple coating method, and exhibited high oxidation and adsorption ability for arsenite [As(III)]. After being incorporated by Fe-Mn binary oxide, the surface area of diatomite increased 36%, and the pore volume increased five times. The pHzpc of FMBO-diatomite was determined to be 8.1. These characteristics are responsible for the increased As(III) adsorption efficiency. The adsorption equilibria of As(III) on FMBO-diatomite were described well by a Langmuir isotherm model due to the homogeneous distribution of Fe-Mn binary oxide on a diatomite surface. As(III) was oxidized into As(V), and then adsorbed by FMBO-diatomite. The oxidation and adsorption efficiencies for As(III) depended deeply on the pH of solution. When the pH was raised to 8.1, the As(III) adsorption efficiency of FMBO-diatomite was almost equal to the As(III) oxidation efficiency. Silicate and phosphate had negative effects on As(III) adsorption. Also the influence of silicate and phosphate with the pH variation was different.
通过一种简单的包覆方法制备了负载于硅藻土中的铁锰二元氧化物（FMBO-硅藻土），其对亚砷酸盐[As(III)]表现出高氧化和吸附能力。负载铁锰二元氧化物后，硅藻土的比表面积增加了36%，孔体积增加了五倍。测定FMBO-硅藻土的零电荷点pH值为8.1。这些特性是As(III)吸附效率提高的原因。由于铁锰二元氧化物在硅藻土表面均匀分布，Langmuir等温线模型很好地描述了As(III)在FMBO-硅藻土上的吸附平衡。As(III)被氧化为As(V)，然后被FMBO-硅藻土吸附。As(III)的氧化和吸附效率很大程度上取决于溶液的pH值。当pH值升高到8.1时，FMBO-硅藻土对As(III)的吸附效率几乎等于As(III)的氧化效率。硅酸盐和磷酸盐对As(III)的吸附有负面影响。而且硅酸盐和磷酸盐随pH值变化的影响也不同。
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