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Òâ¼ûÊÇ1. The Fe3O4-MWNT for Methylene Blue removal has been discussed in a reference paper: N. Yang, S.min Zhu, D. Zhang, and S. Xu, ¡°Synthesis and properties of magnetic Fe3O4-activated carbon nanocomposite particles for dye removal,¡± Materials Letters, vol. 62, pp. 645-647. However, from what I observe, there does have several improvements from the reference paper to this paper. For example, the saturation magnetization (Ms) was 2.78 emu/g in the reference paper, whereas it is 26.1 emu/g in this paper. The great improvement of this paper is probably due to the preparation of Fe3O4-MWNT. In the reference paper, only +3 Fe (Fe(NO3)3) is used, while the majority +3 Fe might not be reduced to +2 Fe. In this paper, both +3 Fe (FeCl3) and +2 Fe (FeCl2) were used, and the formation of Fe3O4 becomes straightforward. For another example, this paper clearly shows the dye concentration versus adsorption time and the colored picture of sample before and after adsorption of dye; the reference paper has not even show these two important figures
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