Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba 305-8572, Japan.
J Colloid Interface Sci. 2011 Jan 15;353(2):542-8. doi: 10.1016/j.jcis.2010.09.066. Epub 2010 Oct 1.
Ferric-impregnated volcanic ash (FVA) which consisted mainly of different forms of iron and aluminum oxide minerals was developed for arsenate (V) removal from an aqueous medium. The adsorption experiments were conducted in both DI water samples and actual water (Lake Kasumigaura, Japan) to investigate the effects of solution mineralization degree on the As(V) removal. Kinetic and equilibrium studies conducted in actual water revealed that the mineralization of water greatly elevated the As(V) adsorption on FVA. The experiment performed in DI water indicated that the existence of multivalence metallic cations significantly enhanced the As(V) adsorption ability, whereas competing anions such as fluoride and phosphate greatly decreased the As(V) adsorption. It is suggested that FVA is a cost-effective adsorbent for As(V) removal in low-level phosphate and fluoride solution. It was important to conduct the batch experiment using the actual water to investigate the arsenic removal on adsorbents.
铁浸渍火山灰（FVA）主要由不同形式的铁和铝氧化物矿物组成，用于从水溶液中去除砷酸盐（V）。在去离子水样品和实际水（日本霞浦湖）中进行了吸附实验，以研究溶液矿化度对 As(V)去除的影响。在实际水中进行的动力学和平衡研究表明，水的矿化度大大提高了 FVA 对 As(V)的吸附。在去离子水中进行的实验表明，多价金属阳离子的存在显著提高了 As(V)的吸附能力，而氟化物和磷酸盐等竞争阴离子则大大降低了 As(V)的吸附。因此，FVA 是一种去除低水平磷酸盐和氟化物溶液中 As(V)的具有成本效益的吸附剂。使用实际水进行批量实验以研究吸附剂对砷的去除是很重要的。
