División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, A.C., Camino a la Presa San José 2055, Col. Lomas 4ta Sección, C.P. 78216, San Luís Potosí, S.L.P., México.
Water Res. 2012 Jun 1;46(9):2973-82. doi: 10.1016/j.watres.2012.03.026. Epub 2012 Mar 20.
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 °C), hydrolysis time (4-16 h), and FeCl(3) concentration (0.4-3 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 mg As/g at 1.5 ppm As at equilibrium and pH 7.
颗粒状铁水（氢）氧化物对砷（V）的吸附已被证明是一种可靠的技术。然而，由于该材料的机械性能较低，难以将其应用于大规模的水处理。因此，本研究的目的是开发一种将铁水（氢）氧化物纳米颗粒锚定在活性炭上的方法，其中铁水（氢）氧化物纳米颗粒将为活性炭提供更高的比表面积，用于砷的吸附，同时有助于避免活性炭孔的堵塞。采用铁的热水解作为锚固程序，对三种活性炭进行了改性。通过表面响应方法研究了水解温度（60-120°C）、水解时间（4-16 小时）和 FeCl3浓度（0.4-3 mol Fe/L）的影响。改性样品的铁含量范围为 0.73%至 5.27%，范围的较高端属于含氧量较高的碳。含有较小铁水（氢）氧化物颗粒的材料表现出增强的砷吸附能力。所报道的最佳吸附剂材料在 1.5 ppm As 时平衡 pH 值为 7，砷吸附容量为 4.56 mg As/g。
