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Characterization of the obtained SiO2 nanospheres: (A) SEM image; (B) TEM image; (C) DLS result; (D) FTIR spectrum; (E) XRD reflection. (F) the schematic preparation of SiO2-ceramic sheet by non-sintered pressure method. (G and H) the schematic filtration of dye- and bacteria-polluted water, respectively.
