不同吸附剂及铁（III）盐对水中砷（V）的吸附特性
Adsorption Characteristics of Different Adsorbents and Iron(III) Salt for Removing As(V) from Water.
作者信息
Ćurko Josip, Matošić Marin, Crnek Vlado, Stulić Višnja, Mijatović Ivan
机构信息
Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia.
出版信息
Food Technol Biotechnol. 2016 Jun;54(2):250-255. doi: 10.17113/ftb.54.02.16.4064.
The aim of this study is to determine the adsorption performance of three types of adsorbents for removal of As(V) from water: Bayoxide E33 (granular iron(III) oxide), Titansorb (granular titanium oxide) and a suspension of precipitated iron(III) hydroxide. Results of As(V) adsorption stoichiometry of two commercial adsorbents and precipitated iron(III) hydroxide in tap and demineralized water were fitted to Freundlich and Langmuir adsorption isotherm equations, from which adsorption constants and adsorption capacity were calculated. The separation factor for the three adsorbents ranged from 0.04 to 0.61, indicating effective adsorption. Precipitated iron(III) hydroxide had the greatest, while Titansorb had the lowest capacity to adsorb As(V). Comparison of adsorption from tap or demineralized water showed that Bayoxide and precipitated iron(III) hydroxide had higher adsorption capacity in demineralized water, whereas Titansorb showed a slightly higher capacity in tap water. These results provide mechanistic insights into how commonly used adsorbents remove As(V) from water.
本研究的目的是确定三种吸附剂从水中去除五价砷（As(V)）的吸附性能：Bayoxide E33（粒状三氧化二铁）、Titansorb（粒状二氧化钛）和沉淀氢氧化铁悬浮液。将两种商业吸附剂以及沉淀氢氧化铁在自来水和去离子水中对As(V)的吸附化学计量结果拟合到Freundlich和Langmuir吸附等温线方程，由此计算吸附常数和吸附容量。三种吸附剂的分离因子在0.04至0.61之间，表明吸附效果良好。沉淀氢氧化铁的吸附容量最大，而Titansorb吸附As(V)的容量最低。对来自自来水或去离子水的吸附情况进行比较表明，Bayoxide和沉淀氢氧化铁在去离子水中具有更高的吸附容量，而Titansorb在自来水中的吸附容量略高。这些结果为常用吸附剂如何从水中去除As(V)提供了机理见解。
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