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The polydimethylsiloxane (PDMS) coating penetrated into the underneath ZIF-8 polycrystalline membrane not only blocking the inter-crystalline defects but also hindering the flexibility of the ZIF-8 framework, resulting in an unusual and highly desired increase in the separation selectivity of the CH/CH mixture under high feeding pressures.

A series of unique nanowire superstructures, Cu 2 O nanowire polyhedra, have been synthesized through a cost-effective hydrothermal route. Three types of nanowire polyhedra, namely octahedra, concave octahedra, and hexapods, were formed in high morphological yields (90%) by reducing cupric acetate with o-anisidine or o-phenetidine in the presence of carboxylic acids. The architectures of these Cu 2 O nanowire polyhedra were examined by electron microscopy, which revealed ordered, highly aligned Cu 2 O nanowires within the polyhedral outlines. The growth of the Cu 2 O nanowire polyhedra is controlled by the orientation and growth rates of the nanowire branches which are adjusted by addition of carboxylic acids. Compared to the Cu 2 O samples reported in the recent literature, the Cu 2 O nanowire octahedra exhibit notably enhanced photocatalytic activities for dye degradation in the presence of H 2 O 2 under visible light, probably due to the high-density charge carriers photoexcited from the branched nanowires with their special structures. Additionally, the discussion in the recent literature of the photocatalytic activity of Cu 2 O in the absence of H 2 O 2 for direct photodegradation of dyes seems questionable.

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