Fig. 2

FT-IR spectra of APTES, Hal-TCT, Hal-TCT-IDA, IDA, and Ce/Hal-TCT-IDA. Inset: the magnified FT-IR of Hal-TCT in the range of 2700–3500 cm−1.

FT-IR spectra of APTES, Hal-TCT, Hal-TCT-IDA, IDA, and Ce/Hal-TCT-IDA. Inset: the magnified FT-IR of Hal-TCT in the range of 2700–3500 cm−1.