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In this study, alternative magnetic active charcoals (ACs) with magnetic responsibility for magnetic separations were synthesized by a chemical precipitation processing and subsequent heat treatments at 473K in H2 or air atmosphere. For various magnetic ACs, their adsorption abilities for bisphenol-A, methylene blue, and arsenic solution were evaluated. Magnetic AC with the same adsorption ability as normal AC could be collected and separated with a permanent magnet, demonstrating the successful synthesis of magnetic AC applicable to magnetic separations. Furthermore, magnetic AC heat treated in H2 possessed the high ability for arsenic removal.
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Nakahira et al. (2007) studied this question.
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