Chlorpyrifos (CPF) was firstly included in sulfonated hydroxyethyl-β-cyclodextrin (SBECD) and carboxymethyl-β-cyclodextrin (CMCD) in an ethanol or 1-methyl-2-pyrrolidinone (NMP) solvent. Inclusion complexes (CPF/SBECD and CPF/CMCD) were then intercalated into the galleries of ZnAl-layered double hydroxides (ZAL) to synthesize ZAL-SBECD-CPF and ZAL-CMCD-CPF intercalated materials. The structure and thermal stability of nanohybrids were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and thermal gravimetric and differential thermal analysis (TG-DTA). The results showed that both CPF/SBECD and CPF/SBECD were successfully intercalated in the interlayer. The samples prepared in the NMP solvent had a stronger diffraction peak intensity than those prepared with ethanol. The intercalated CPF molecules had a high thermal stability. Furthermore, the release behaviors of CPF from ZAL-SBECD-CPF and ZAL-CMCD-CPF nanohybrids were investigated and analyzed at pH 5.
An experiment "Doping and Photocatalytic Performance of TiO2 Nanopowder" was performed in inorganic comprehensive laboratory for Boling Class of Nankai University. After the dopant precursors and corresponding contents were determined by the students, different elements doped TiO2 powders were prepared by sol-gel method, and characterized by scanning electronic microscopy, transmittance electronic microscopy, powder X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. The photocatalytic performances of the prepared catalysts were monitored by the degradation of methyl orange as the simulated wastewater to select the superior ones for photocatalytic water splitting test. Through this comprehensive experiment related to research frontier, the students in Boling Class can obtain basic research training and their scientific literacy can be improved.
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