Anchorage of iron hydro(oxide) nanoparticles onto activated carbon to remove As(V) from water

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• 作者：Cesar Nieto-Delgado ; Jose Rene Rangel-Mendez ; ^{rene@ipicyt.edu.mx}
• 关键词：Modified activated carbon ; Iron hydrolysis ; Arsenic (V) removal ; Surface response methodology ; Iron nanoparticles
• 刊名：Water Research
• 出版年：2012
• 期刊代码：57_00431354
• 类别：civ
• 出版时间：1 June, 2012
• 卷：46
• 期：9
• 页码：2973-2982
• 文件大小：1628 K

摘要

The adsorption of arsenic (V) by granular iron hydro(oxides) has been proven to be a reliable technique. However, due to the low mechanical properties of this material, it is difficult to apply it in full scale water treatment. Hence, the aim of this research is to develop a methodology to anchor iron hydro(oxide) nanoparticles onto activated carbon, in which the iron hydro(oxide) nanoparticles will give the activated carbon an elevated active surface area for arsenic adsorption and also help avoid the blockage of the activated carbon pores. Three activated carbons were modified by employing the thermal hydrolysis of iron as the anchorage procedure. The effects of hydrolysis temperature (60-120聽掳C), hydrolysis time (4-16聽h), and FeCl₃ concentration (0.4-3聽mol Fe/L) were studied by the surface response methodology. The iron content of the modified samples ranged from 0.73 to 5.27%, with the higher end of the range pertaining to the carbons with high oxygen content. The materials containing smaller iron hydro(oxide) particles exhibited an enhanced arsenic adsorption capacity. The best adsorbent material reported an arsenic adsorption capacity of 4.56聽mg As/g at 1.5聽ppm As at equilibrium and pH 7.