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Comparison of the raw kaolin, metakaolin, synthesized zeolite 4A, and commercial zeolite 4A, in (A) X-ray diffraction (XRD) patterns, (B) Fourier transform infrared (FTIR) spectra, and (C) scanning electron microscopy (SEM) morphology: (a) raw kaolin, (b) metakaolin, and (c,d) synthesized zeolite 4A.
