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Comparison of FTIR spectra after hydrothermal synthesis without a surfactant (P) and assisted with four surfactants (CTAB, SDS, F127, and CAPB) after calcination at 900 °C for 4 h (P-C, CTAB-C, SDS-C, F127-C, and CAPB-C) at (a) pH 4, (b) pH 4 after calcination, (c) pH 9, and (d) pH 9 after calcination.
