Incorporation of iodine into the channels of AlPO4-5 crystals

Iodine molecules have been incorporated into the channels of calcined AlPO4-5 crystals by using vapor-phase diffusion method. XRD results indicate that the iodine-loaded AlPO4-5 crystals are of similar structure as that of as-synthesized AlPO4-5 crystals. TG and XRF analyses reveal that the iodine molecules have not compactly filled the channels of AlPO4-5 crystals, and the desorbing process of adsorbed iodine is quite different from that of adsorbed water. Polarized Raman spectra imply that the iodine exists in the channels of AlPO4-5 crystals as vapor-like I2 molecules, and the I2 molecules orientate randomly.