Martinson Carol A, Reddy K J
Department of Renewable Resources, College of Agriculture, University of Wyoming, Laramie, WY, USA.
J Colloid Interface Sci. 2009 Aug 15;336(2):406-11. doi: 10.1016/j.jcis.2009.04.075. Epub 2009 May 6.
Millions of people worldwide are exposed to chronic levels of arsenic poisoning due to drinking water with elevated concentrations of arsenic. To decrease these concentrations, various metal based compounds have been explored as arsenic adsorbents. We synthesized CuO nanoparticles and evaluated them as an adsorbent to remove As(III) and As(V) from groundwater. The CuO nanoparticles had a surface area of 85 m(2)/g and were 12-18 nm in diameter. Adsorption occurred within minutes and CuO nanoparticles effectively removed As(III) and As(V) between pH 6 and 10. The maximum adsorption capacity was 26.9 mg/g for As(III) and 22.6 mg/g for As(V). The presence of sulfate and silicate in water did not inhibit adsorption of As(V) but only slightly inhibited adsorption of As(III). High concentrations of phosphate (>0.2 mM) reduced the adsorption of arsenic onto CuO nanoparticles. X-ray photoelectron spectroscopy (XPS) indicated that As(III) was oxidized and adsorbed in the form of As(V) on the surface of CuO. The CuO nanoparticles were also able to remove arsenic (to less than 3 microg/L) from groundwater samples. These results suggest that CuO nanoparticles are an effective material for arsenic adsorption and may be used to develop a simple and efficient arsenic removal method.
全球数百万人因饮用砷浓度升高的水而面临慢性砷中毒风险。为了降低这些浓度，人们探索了各种金属基化合物作为砷吸附剂。我们合成了氧化铜纳米颗粒，并评估了它们作为吸附剂从地下水中去除As(III)和As(V)的能力。氧化铜纳米颗粒的表面积为85平方米/克，直径为12 - 18纳米。吸附在几分钟内即可发生，氧化铜纳米颗粒在pH值为6至10的范围内能有效去除As(III)和As(V)。As(III)的最大吸附容量为26.9毫克/克，As(V)的最大吸附容量为22.6毫克/克。水中硫酸根和硅酸根的存在不会抑制As(V)的吸附，但只会轻微抑制As(III)的吸附。高浓度的磷酸盐（>0.2 mM）会降低砷在氧化铜纳米颗粒上的吸附。X射线光电子能谱（XPS）表明，As(III)被氧化并以As(V)的形式吸附在氧化铜表面。氧化铜纳米颗粒还能够从地下水样品中去除砷（至低于3微克/升）。这些结果表明，氧化铜纳米颗粒是一种有效的砷吸附材料，可用于开发一种简单高效的除砷方法。
