Zr-β-FeOOH 的制备及除砷性能评价。
Preparation and evaluation of Zr-beta-FeOOH for efficient arsenic removal.
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 Environ Sci (China). 2013 Apr 1;25(4):815-22. doi: 10.1016/s1001-0742(12)60085-0.
A Zr-beta-FeOOH adsorbent for both As(V) and As(III) removal was prepared by a chemical co-precipitation method. Compared with beta-FeOOH, the addition of Zr enhanced the adsorption capacities for As(V) and As(III), especially As(III). The maximum adsorption capacities for As(III) and As(V) were 120 and 60 mg/g respectively at pH 7.0, much higher than for many reported adsorbents. The adsorption data accorded with Freundlich isotherms. At neutral pH, for As(V), adsorption equilibrium was approached after 3 hr, while for As(III), adsorption equilibrium was approached after 5 hr. Kinetic data fitted well to the pseudo second-order reaction model. As(V) elimination was favored at acidic pH, whereas the adsorption of As(III) by Zr-beta-FeOOH was found to be effective over a wide pH range of 4-10. Competitive anions hindered the adsorption according to the sequence: phosphate > silicate > bicarbonate > sulfate > nitrate, while Ca2+ and Mg2+ increased the removal of As(III) and As(V) slightly. The high adsorption capability and good performance in other aspects make Zr-beta-FeOOH a potentially attractive adsorbent for the removal of both As(III) and As(V) from water.
一种用于同时去除 As(V)和 As(III)的 Zr-β-FeOOH 吸附剂是通过化学共沉淀法制备的。与β-FeOOH 相比，Zr 的加入增强了对 As(V)和 As(III)的吸附能力，尤其是 As(III)。在 pH 7.0 时，Zr-β-FeOOH 对 As(III)和 As(V)的最大吸附容量分别为 120 和 60mg/g，远高于许多已报道的吸附剂。吸附数据符合 Freundlich 等温线。在中性 pH 下，对于 As(V)，吸附平衡在 3 小时后达到，而对于 As(III)，吸附平衡在 5 小时后达到。动力学数据很好地符合伪二级反应模型。As(V)的去除在酸性 pH 下更有利，而 Zr-β-FeOOH 对 As(III)的吸附在 4-10 的宽 pH 范围内有效。竞争阴离子的顺序为：磷酸盐＞硅酸盐＞碳酸氢盐＞硫酸盐＞硝酸盐，阻碍了吸附，而 Ca2+和 Mg2+ 略微增加了 As(III)和 As(V)的去除率。Zr-β-FeOOH 具有高吸附能力和良好的其他性能，使其成为一种很有吸引力的用于从水中同时去除 As(III)和 As(V)的吸附剂。
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