Microhydrogel surface-supported quaternary ammonium peroxotungstophosphate as reusable catalytic materials for oxidation of DBT

Clean Synthesis of Epoxidized Tung Oil Derivatives via Phase Transfer Catalyst and Thiol–ene Reaction: A Detailed Study

“…Antisymmetrical vibration absorption peaks of P–O a , W–O d , and W–O d –W in corner shared octahedra appeared at 1073, 972, and 899 cm –1 . The peaks at 806 cm –1 was corresponded to antisymmetrical vibration absorption peaks of W–O c –W in edge shared octahedra. , The results proved that the Keggin structure, as seen from Figure S1f, was existed in the chemical structure of phosphotungstic acid. The peak at 3491 cm –1 in the FT-IR of catalyst disappeared, antisymmetrical vibration absorption peaks of P–O a , W–O d , and W–O d –W in corner shared octahedra appeared at 1079, 944, and 881 cm –1 , which were characteristic skeletal vibrations of Keggin oxoanions. , The absorption band at 804 cm –1 was attributed to antisymmetrical vibration absorption peaks of W–O c –W in edge shared octahedra. , Shift changes of infrared characteristic absorption peak was due to the production of WO x components, which was derived from W–O–W bonds after treating by hydrogen peroxide solution.…”

“…The peaks at 806 cm −1 was corresponded to antisymmetrical vibration absorption peaks of W−O c −W in edge shared octahedra. 34,35 The results proved that the Keggin structure, as seen from Figure S1f, was existed in the chemical structure of phosphotungstic acid. The peak at 3491 cm −1 in the FT-IR of catalyst disappeared, antisymmetrical vibration absorption peaks of P−O a , W−O d , and W−O d −W in corner shared octahedra appeared at 1079, 944, and 881 cm −1 , which were characteristic skeletal vibrations of Keggin oxoanions.…”

“…The peak at 3491 cm −1 in the FT-IR of catalyst disappeared, antisymmetrical vibration absorption peaks of P−O a , W−O d , and W−O d −W in corner shared octahedra appeared at 1079, 944, and 881 cm −1 , which were characteristic skeletal vibrations of Keggin oxoanions. 34,35 The absorption band at 804 cm −1 was attributed to antisymmetrical vibration absorption peaks of W−O c −W in edge shared octahedra. 34,35 Shift changes of infrared characteristic absorption peak was due to the production of WO x components, which was derived from W−O−W bonds after treating by hydrogen peroxide solution.…”

“…34,35 The absorption band at 804 cm −1 was attributed to antisymmetrical vibration absorption peaks of W−O c −W in edge shared octahedra. 34,35 Shift changes of infrared characteristic absorption peak was due to the production of WO x components, which was derived from W−O−W bonds after treating by hydrogen peroxide solution. WO x components polymerized via sharing oxygen atoms in Keggin structure.…”

Formation mechanism of zigzag patterned P(NIPAM-co-AA)/CuS composite microspheres by in situ biomimetic mineralization for morphology modulation

“…Additionally, the unswollen core constrains the swelling region, and thus leads to pattern formation in the wetted region. Although the composition of our composite microspheres with pattern is different from the hydrogel mentioned above, based on the results we reported, [21][22][23][24][25][26][27]32,33 the patterned structures of the composite microspheres made by in situ deposition of inorganic ingredients on the microgel were seemingly related to network distortion of the microgel surface instead of the crystal appearance of the inorganic components. So, in this paper, the formation mechanism on the patterned surface of the P(NIPAMco-AA)/CuS composite microspheres was mainly concentrated to research on factors related to the deformation of the P(NIPAMco-AA) gel networks as CuS in situ formed.…”