Genç-Fuhrman Hülya, Tjell Jens Christian, McConchie David
Technical University of Denmark, Environment & Resources, Bygningstorvet, Building 115, DK-2800 Kongens Lyngby, Denmark.
J Colloid Interface Sci. 2004 Mar 15;271(2):313-20. doi: 10.1016/j.jcis.2003.10.011.
The possibility of increasing the arsenate adsorption capacity of seawater-neutralized red mud (Bauxsol) through acid treatment, combined acid and heat treatment, and the addition of ferric sulfate (Fe(2)(SO(4))(3).7H(2)O) or aluminum sulfate (Al(2)(SO(4))(3). 18H(2)O) is investigated. The results show that acid treatment alone, as well as in combination with heat treatment increases the removal efficiency, with the combination providing the best removal. Adding ferric sulfate or aluminum sulfate, however, suppress the removal. The results also show that activated Bauxsol (AB) produced using combined acid and heat treatment can remove roughly 100% arsenate (at pH 4.5) with or without competing anions (i.e., phosphate, bicarbonate, and sulfate) when the initial arsenate concentration is < or = 2 mgl(-1). Furthermore, it is found that the adsorption process using AB is not accompanied by the release of unwanted contaminants, and TCLP results indicate that the spent AB is not hazardous. It is believed that the AB produced here has good potential as an alternative adsorbent to conventional methods for removing arsenate from water.
研究了通过酸处理、酸与热处理相结合以及添加硫酸铁（Fe₂(SO₄)₃·7H₂O）或硫酸铝（Al₂(SO₄)₃·18H₂O）来提高海水中和赤泥（Bauxsol）对砷酸盐吸附能力的可能性。结果表明，单独的酸处理以及酸与热处理相结合均能提高去除效率，其中酸与热处理相结合的效果最佳。然而，添加硫酸铁或硫酸铝会抑制去除效果。结果还表明，当初始砷酸盐浓度≤2 mg/L时，采用酸与热处理相结合制备的活性Bauxsol（AB）在有或没有竞争性阴离子（即磷酸盐、碳酸氢盐和硫酸盐）存在的情况下（pH为4.5），均可去除约100%的砷酸盐。此外，发现使用AB的吸附过程不会伴随有害污染物的释放，TCLP结果表明用过的AB不具有危险性。据信，此处制备的AB作为一种替代吸附剂，在从水中去除砷酸盐方面具有优于传统方法的良好潜力。
