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In this article, mechanical grinding, an effortless and super-effective synthetic strategy, is used to successfully synthesize a TiO quantum dot (TiOQD)/graphitic carbon nitride (g-CN) heterostructure. X-ray photoelectron spectroscopy results together with transmission electron microscopy reveal the formation of the TiOQD/g-CN heterostructure with strong interfacial interaction. Because of the advantages of this characteristic, the prepared heterostructure exhibits excellent properties for photocatalytic wastewater treatment. Notably, the optimum photocatalytic activity of the TiOQD/g-CN heterostructure is nearly 3.4 times higher than that of the g-CN nanosheets used for the photodegradation of rhodamine B pollutant. In addition, the stability and possible degradation mechanism of the TiOQD/g-CN heterojunction are studied in detail. This method may stimulate an effective approach to synthesizing QD-sensitized semiconductor materials and facilitate their application in environmental protection.

The systematic and delicate geometry control of Cu 2 O nanostructures with different size can be achieved by simply tuning the dropping speed of NH 2 OH HCl, the volume of solvent and the concentration of NaOH.All the Cu 2 O nanocrystals exhibit better adsorption ability than granular active carbon on MO (methyl orange), and the hollow sphere Cu 2 O shows the best adsorption performance, MO with a concentration of 15 mg L À1 is completely absorbed by the hollow sphere Cu 2 O in 5 min. The gas detection sensitivity is also investigated and the hollow sphere structures exhibit the best gas-sensing response, and more importantly, at low temperature and even ppb level it also exhibits a remarkably high response, fast response, recovery time and good stability.

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