HPW/PDMAEMA‐b‐PMAA/ZIF‐8 Ternary Lamellar Composite and the Photocatalytic Degradation of Methylene Blue

Abstract

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.

Highly Efficient Catalysts for Conversion of CO2 into Cyclic Carbonates Based on the Ternary Layered ZIF‐8/P4VP/Au Hybrids

“…The pure ZIF‐8 showed the regular dodecahedral particles with an average diameter of about 100 nm (Figure a). With P4VP as surfactants, the ZIF‐8/P4VP exhibited a two‐dimensional layered structure (Figure b), which implies that P4VP could hinder the longitudinal growth of ZIF‐8 crystal and cause ZIF‐8 to grow laterally into a sheet‐like structure . Figure e clearly showed Au NPs with a diameter of about 2 nm were uniformly distributed on the surface of 2D ZIF‐8/P4VP and the crystal fringe about 0.235 nm attributed to the (111) plane of Au was also noticed (Figure f).…”

In‐Situ Synthesis of Tetraphenylporphyrin/Tungsten (VI) Oxide/Reduced Graphene Oxide (TPP/WO3/RGO) Nanocomposite for Visible Light Photocatalytic Degradation of Acid Blue 25

“…Moreover, the TWR (350) composite and the dye molecules have affinity to each other such that the larger surface area and the phenyl structure of the rGO sheets enhanced adsorption of dyes and their degradation efficiency. The FTIR results indicated that rGO contains different functional groups, such as hydroxyl, epoxy and carboxylic groups, and the π–π interaction between the aromatic rings of the TPP/WO 3 /EG composite with heterocyclic dye molecules smoothed the generation of hydroxyl radical's for their complete mineralisation . The mechanism of photodegradation of the AB25 can be summarised by the following reactions as presented on scheme …”

“…The FTIR results indicated that rGO contains different functional groups, such as hydroxyl, epoxy and carboxylic groups, and the π–π interaction between the aromatic rings of the TPP/WO 3 /EG composite with heterocyclic dye molecules smoothed the generation of hydroxyl radical's for their complete mineralisation . The mechanism of photodegradation of the AB25 can be summarised by the following reactions as presented on scheme …”

“…However, various reports based on different industries such as clothing textiles, pharmaceuticals, quality assurance laboratories, production industries, furniture and numerous others polluting the environment (water and air) with solid wastes, effluents and various synthetic dyes is of global concern . Recent, researchers have focussed on the coloured wastewater discharged from textile, food and printing industries into the rivers without proper treatment which leads to detrimental effects to fresh water flora and fauna, environmental ecology and human health . These industries may use acid dyes (when classified by use) and the conversional methods currently used in their treatment plants fail to remove these dyes from their wastewater discharges resulting in coloured effluents.…”

Preparation of amphiphilic copolymers via base-catalyzed hydrolysis of quaternized poly[2-(dimethylamino)ethyl methacrylate]

“…36 Other researchers were also interested in this kind of diblock and random copolymer. 37–39 These facts encouraged us to investigate an alternative route of synthesis of PMAA- co -PDMAEMA, simultaneously figuring out the intricacies of alkaline hydrolysis of qPDMAEMA.…”