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A novel adsorbent of CaFe2O4 magnetic nanoparticles (MNPs) which was synthesized by sol–gel process, showed an excellent high affinity to anionic congo red (CR), and could be employed to selectively adsorb CR from ternary dye system with a high separation factor. The mechanism of the selectivity was revealed in detail. The effects of various parameters such as pHs, ionic strengths and coexisting ions...
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