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The development of underwater mechanically robust oil-repellent materials is important due to the high demand for these materials with the increase in underwater activities. Based on the previous study, a new strategy is demonstrated to prepare underwater mechanically robust oil-repellent materials by combining conflicting properties using a heterostructure, which has a layered hydrophobic interior structure with a columnar hierarchical micro/nanostructure on the surface and a hydrophilic outer structure. The surface hydrophilic layer imparts underwater superoleophobicity and low oil adhesion to the material, which has oil contact angle of larger than 150° and adhesion of lower than 2.8 µN. The stability of the mechanical properties stemming from the interior hydrophobic-layered structure enables the material to withstand high weight loads underwater. The tensile stress and the hardness of such a heterostructure film after 1 month immersion in seawater and pH solution are in the range from 83.92 ± 8.22 to 86.73 ± 7.8 MPa and from 83.88 ± 6.8 to 86.82 ± 5.64 MPa, respectively, which are superior to any underwater oil-repellent material currently reported.

Layered heterostructure poly(acrylic acid) (PAA)/poly(vinylidene fluoride)–graphene nanosheet composites with a convex hexagonal columnar structure on the surface are prepared. The outer hydrophilic PAA hydrogel coating prevents underwater oil adhesion to the material. The inner hydrophobic layer microstructure endows the material with excellent mechanical properties even after immersion in seawater and at different pH values for 1 month.

This paper reports the green and in situ preparation of Fe₃O₄@SiO₂-Ag magnetic nanocatalyst synthesized using safflower (Carthamus tinctorius L.) flower extract without the addition of any stabilizers or surfactants. The catalytic performance of the resulting nanocatalyst was examined for the reduction of 4-nitrophenol (4-NP), methylene blue (MB) and methyl orange (MO) in an environment-friendly medium at room temperature. The main factors such as pH, temperature and amount of catalyst influencing the nanocatalyst performance were studied. The apparent rate constants for 4-NP, MO and MB reduction were calculated, being 0.756 min⁻¹, 0.064 s⁻¹ and 0.09 s⁻¹, respectively. The catalyst was recovered using an external magnet and reused several times with negligible loss of catalytic activity. The as-synthesized nanoparticles were characterized using powder X-ray diffraction, transmission electron microscopy, UV–visible, Fourier transform infrared and inductively coupled plasma atomic emission spectroscopies, dynamic light scattering and vibrating sample magnetometry.

Fe₃O₄@SiO₂-Ag nanocatalyst was prepared by using safflower flower extract and characterized by X-ray powder diffraction, transmission electron microscopy, UV-Vis spectroscopy, Fourier transform infrared spectra, Inductively coupled plasma atomic emission spectroscopy, dynamic light scattering and vibration sample magnetometer. This nanocatalyst was used for the reduction of dye pollutants in water such 4-nitrophenol (4-NP), methylene blue (MB) and methyl orange (MO). The nanocatalyst is stable and reusable.

Palladium(II) have been immobilized into the nano magnetic Fe₃O₄ which was functionalized with glucose in order to achieve a one-pot synthesis of 2-substituted benzoxazole derivatives with high yields in the diverse range of organic solvents. The nano catalyst is highly dispersive in polar solvents and can be easily recovered and reused for 6 runs without significant loss of its activity. Finally, the catalyst was fully characterized by FT-IR, TGA, CHN, SEM, EDX and atomic absorption spectroscopy.

• A catalyst based on Pd immobilized onto glucose functionalized magnetic nanoparticles is synthesized for the benzoxazoles synthesis.
• The catalyst recovery is carried out by applying an external magnetic field.
• Using glucose as a green ligand for synthesis of benzoxazole derivatives.

KCC-1/IL/Pd NPs can used as an excellent support for the synthesis of highly sparse homogeneous catalyst. KCC-1 has high surface area that was functionalized with ionic liquid phase acting as the strong performers so that the Pd catalyst was well-dispersed without aggregation on the framework of the KCC-1/IL. This nano catalyst was specified by TGA, XRD, TEM, SEM, FT-IR, and ICP. For reduction of 2-nitroaniline and 4-nitrophenol used from the KCC-1/IL/Pd NPs as a green catalyst that showed excellent catalytic activities. Compared with the traditional substrate, KCC-1 substantially increases protection and the accessibility of the nanoparticle sites due to its three dimensional hierarchical structure.

KCC-1/IL/Pd NPs can used as a excellent support for the synthesis of highly sparse homogeneous catalyst. This nano catalyst was specified by TGA, XRD, TEM, SEM, FT-IR, and ICP. For reduction of 2-nitroaniline and 4-nitrophenol used from the KCC-1/IL/Pd NPs as a green catalyst that showed excellent catalytic activities. Compared with the traditional substrate, KCC-1 substantially increases protection and the accessibility of the nanoparticle sites due to its three dimensional hierarchical structure.

In this study, we have focused on the synthesis, characterization, and oil absorption properties of Al₂O₃ microspheres/acrylic ester resin (AER) hybrids. The Al₂O₃ microspheres are prepared by a combined hydrothermal and sintering processes, followed by surface modification with silane coupling agent (KH 570). The Al₂O₃ microspheres/AER hybrids with a rough surface are synthesized by a microwave polymerization route by using modified Al₂O₃ microspheres as modifiers. In this hybrid materials system, the Al₂O₃ microspheres with porous structures may provide fast oil absorption due to the low oils absorption energy and short diffusion lengths. The resin hybrids exhibited reversible oils and organic solvents adsorption with maximum absorption capacities up to 29.85 g/g. This study suggests potential environmental advantage in using metal oxide microspheres in improving the oil absorption properties of oil-absorbing resins as absorbents for recovering oil and organic solvent from water.

The synthesis, characterization, and oil absorption properties of Al₂O₃ microspheres/acrylic ester resin hybrids

A novel water stable luminescent Zn^II-MOF (NUM-5) has been successfully assembled that exhibits a fast, sensitive and selective luminescence quenching response towards Cr^VI (Cr₂O₇²⁻/CrO₄²⁻) in aqueous solution. Moreover, it also shows excellent recyclability and low detection limit. So, NUM-5 is an ideal candidate for detecting contaminants. More information can be found in the Full Paper by T.-L. Hu, X.-H. Bu et al. (DOI: 10.1002/chem.201705328).