PDMAEMA‐b‐PMAA block copolymers were prepared by the sequential RAFT polymerization of DMAEMA and tBMA, followed by hydrolysis. Phosphotungstic acid (HPW) was anchored to the PDMAEMA blocks through electrostatic interactions and the as‐obtained HPW/PDMAEMA‐b‐PMAA was added to the synthesis of ZIF‐8. During the formation of ZIF‐8, the PMAA blocks coordinated to the Zn2+ ions through their carboxy groups, along with the HPW groups that were anchored to the PDMAEMA blocks. In this way, the block copolymer could consolidate the interactions between HPW and ZIF‐8 and prevent the leakage of HPW. Finally, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite was obtained and the structure of the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 hybrid material was characterized by using powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). As a photocatalyst, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite showed excellent photoactivity for the degradation of methylene blue (MB). The rate of degradation of MB was 0.0240 min−1, which was 7.5‐times higher than that of commercially available P25 (0.0032 min−1). In the presence of H2O2, the kinetic degradation parameters of the composite reached 0.0634 min−1, which was about 19.8‐times higher than that of P25.

A ternary heterogeneous composite combining reduced graphene oxide (RGO), black titanium dioxide (B−TiO2) nanosheets and two dimensional ZIF‐8 sheets (2D‐ZIF‐8) was prepared. Under hydrothermal condition, B−TiO2 nanosheets and GO were tightly bound together, and meanwhile GO was reduced to RGO. Upon mixing with poly (vinyl pyrrolidone) (PVP)‐modified 2D‐ZIF‐8, the RGO/B−TiO2/2D‐ZIF‐8 ternary composite was obtained by PVP binding between B−TiO2 and 2D‐ZIF‐8. The introduction of 2D‐ZIF‐8 endowed the ternary composite a good adsorption capability of contaminant and followed degradation in situ at the site of adsorption. Owing to synergistic catalysis of oxygen vacancy and the formation of double heterogeneous interfaces, the prepared ternary composite had good visible light adsorption and rapid charge separation rate, which improved the photocatalytic performance. The rate constant of photocatalytic degradation of doxycycline hydrochloride and methylene blue by RGO/B−TiO2/2D‐ZIF‐8 was determined to be 0.0118 and 0.0232 min−1, respectively, which are 2.68 and 3.3 times that of B−TiO2. This study could provide deep insight for the design of high and bi‐functional activity catalysts based on the assembly of two‐dimensional sheet.

A series of poly-vinyl benzoic acid (PVBA) and UiO-66 materials (PVBA-UiO-66) were prepared by a mixed-linker approach. Using a flexible PVBA with multi-coordination groups as mixed ligands, mesopores and uncoordinated benzoic groups were introduced into the UiO-66 crystal structures, thus leading to a special structure and functionality. The structure of the PVBA-UiO-66 was characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and nitrogen gas adsorption measurements. The adsorption property toward methylene blue (MB) of PVBA-UiO-66 was studied. The adsorption of MB by UiO-66 and PVBA (43%)-UiO-66 fit the Langmuir model and Freundlich model well. The result showed that PVBA (43%)-UiO-66 has super adsorption capacity as high as 909 mg g-1 for MB owing to the mesopores and the uncomplexed carboxyl groups which were caused by the long PVBA involved in coordination. The adsorption kinetics of MB onto PVBA (43%)-UiO-66 can be well fitted to the pseudo-second-order model. The process of adsorption MB onto PVBA-UiO-66 is spontaneous and thermodynamically favorable at 303, 313 and 323 K.

The P4VP with the molecular weight of 12 K and the molecular weight distribution of 1.2 was synthesized via reversible addition-fragmentation chain transfer polymerization. Then it was added to the system for the preparation of ZIF-8 as a surfactant. A special two-dimensional (2D) sheet was produced because P4VP could promote the lateral growth of ZIF-8. Additionally, the pyridine group from P4VP chains could complex Au 3 + followed by in-situ reduction under UV light to form the 2D ZIF-8/P4VP/Au ternary hybrids. The ternary layered ZIF-8/P4VP/Au hybrids exhibited a good yield for epoxy carbonate of 71 % and the high time-space yield of 3.22 h À 1 in the reaction of carbon dioxide with propylene oxide, which was much higher than 0.425 h À 1 of the conventional homogeneous catalyst KI. Besides, the ternary layered ZIF-8/P4VP/Au showed good stability, the catalytic performance was unchanged after three cycles.

No abstract