Abstract
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 829mgg−1 and 763mgg−1 for Pb2+ and MG (C0=1000mgL−1, at pH3.5, 45°C, reaction time of 2h), 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.
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