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Methylene blue (MB) discoloration was performed using persulfate (PS) activated with the synthesized composites. Four types of composites, which were synthesized by the immobilization of Mn on iron oxides (hematite and goethite) using either NaOH or Ca(OH) 2 , were evaluated as PS activator. The synthesized Mn–Ca–FeOOH composite was selected and it was thermally modified at 300 and 700°C (denoted...
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