[pH值和络合剂对水钠锰矿和水铁矿表面吸附Sb(Ⅴ)的影响]
[Effects of pH and Complexing Agents on Sb(Ⅴ) Adsorption onto Birnessite and Ferrihydrite Surface].
作者信息
Wang Hua-Wei, Li Xiao-Yue, Li Wei-Hua, Sun Ying-Jie
机构信息
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China.
出版信息
Huan Jing Ke Xue. 2017 Jan 8;38(1):180-187. doi: 10.13227/j.hjkx.201606165.
Effects of pH and complexing agents on Sb (Ⅴ) adsorption onto birnessite and ferrihydrite surface were investigated.The results indicated that birnessite and ferrihydrite had strong ability to adsorb Sb (Ⅴ).The removal efficiencies of Sb (Ⅴ) by birnessite and ferrihydrite were dependent on the initial pH in solution.The removal efficiency of Sb (Ⅴ) increased with the decrease of solution pH.At pH 5.0,the removal efficiencies,adsorption rate and adsorption capacity were better than those at pH 7.0 or 9.0.The adsorption process of Sb (Ⅴ) on birnessite and ferrihydrite could be well described by the pseudo-second-order model.The Langmuir model best described the adsorption behavior of Sb (Ⅴ) by birnessite and ferrihydrite at pH 5.0.The presence of citric acid or EDTA had significant effect on Sb (Ⅴ) adsorption onto birnessite and ferrihydrite.
研究了pH值和络合剂对水钠锰矿和针铁矿表面吸附Sb(Ⅴ)的影响。结果表明，水钠锰矿和针铁矿对Sb(Ⅴ)具有较强的吸附能力。水钠锰矿和针铁矿对Sb(Ⅴ)的去除效率取决于溶液的初始pH值。Sb(Ⅴ)的去除效率随溶液pH值的降低而增加。在pH 5.0时，去除效率、吸附速率和吸附容量均优于pH 7.0或9.0时。水钠锰矿和针铁矿对Sb(Ⅴ)的吸附过程可用准二级模型很好地描述。Langmuir模型最能描述pH 5.0时水钠锰矿和针铁矿对Sb(Ⅴ)的吸附行为。柠檬酸或EDTA的存在对水钠锰矿和针铁矿吸附Sb(Ⅴ)有显著影响。
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