화학공학소재연구정보센터
Chemical Engineering Journal, Vol.203, 110-114, 2012
Efficient and selective immobilization of Pb2+ in highly acidic wastewater using strontium hydroxyapatite nanorods
In this paper, strontium hydroxyapatite (Sr-5(PO4)(3)(OH), SrHAp) nanorods were synthesized by a hydrothermal method and utilized for immobilization of Pb2+ from acidic aqueous solutions. The SrHAp nanorods exhibited a high immobilization capacity of 1482 +/- 137 mg g(-1) for Pb2+ in acidic solutions (pH = 2.5) within 15 min. The SrHAp nanorods could selectively immobilize Pb2+ with little immobilization effect on other co-existing metal ions when they were used to treat highly acidic nonferrous metallurgy wastewater (pH = 1.1). The XRD, SEM, EDX and XPS results revealed that the immobilization of Pb2+ by the SrHAp nanorods was mainly due to ion exchange and Pb2+ precipitation. (C) 2012 Elsevier B.V. All rights reserved.