Notice of RetractionA Novel Preparation of Magnetic Granular Activated Carbon with Developed Mesopores and Macropores

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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A novel preparation method of magnetic granular activated carbon with developed mesopores and macropores was proposed. Fe₃O₄ as bifunctional additive could not only promote ablation of carbon but also give activated carbon strong magnetism. Magnetic activated carbons with developed mesopores and macropores were prepared by steam from brown coal in the presence of different amounts of Fe₃O₄ in the raw materials. Then, the magnetic activated carbons were characterized by nitrogen adsorption, scanning electron microscopy, transfer electron microscopy, X-ray diffraction and vibrating sample magnetometer, respectively. The results show that Fe₃O₄ could catalyze the stem activation process and accelerate ablation of carbon during the activation step leading to pores enlarged due to producing mesopores and macropores. In the preparation of magnetic activated carbons, partial Fe₃O₄ has changed into γ-Fe₂O₃ and FeO and these particles left in outer surface and inner bulk of magnetic activated carbons. The more adding content of Fe₃O₄ is higher, the more magnetism of activated carbon is stronger. However, Fe₃O₄ could give activated carbon strong magnetism and prepared magnetic activated carbons belong to weakly magnetic material and can be separated by high-intensity magnetic separator from the original solution.