Powder Technology, Vol.318, 128-134, 2017
Dual-functionalized strontium phosphate hybrid nanopowder for effective removal of Pb2+ and malachite green from aqueous solution
Hybrid strontium phosphate nanopowder (called SP for short) were prepared by a one-pot hydrothermal method and characterized by SEM, EDS, TEM, and XRD. The dual removal of Pb2+ and malachite green (MG) by SP from aqueous solution was systematically investigated. Experiments were carried out in a batch system to optimize operation variables such as solution pH, temperature, adsorbent dosage, and contact time. The adsorption capacity of SP was 829 mg g(-1) and 763 mg g(-1) for Pb2+ and MG (C-0 = 1000 mg L-1, at pH 3.5, 45 degrees C, reaction time of 2 h), respectively. Moreover, SP could be reused for five cycles with a minimal loss of capability (20-30%). Interaction mechanisms were proposed to be ion exchange between Pb2+ and Sr2+ in the lattice and the hydrogen bonds between PO43- in hybrid Pb/Sr-contained phosphate and positively charged hydrogen in MG. This study indicated that SP nanopowder could be facilely produced at a low price and potentially be used as an effective material for removal of both Pb2+ and MG in aqueous solution. (C) 2017 Elsevier B.V. All rights reserved.