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Nanomaterials: environmental remediation Photocatalytic MoS2/Fe2O3 heterojunction nanocomposites are able to remove organic pollutants from wastewater under ultraviolet light. Material systems are needed that can remove organic pollutants from the environment, many of which are driven by photocatalysis. As well as the challenge of efficiently removing contaminants from the environment, the photocatalytic material must also be recovered afterwards. Here, a team led by Jinghai Yang from Jilin Normal University report a MoS2/Fe2O3 nanocomposite that photocatalytically degrades bisphenol A under ultraviolet irradiation. Their semiconducting composite can also function as an effective SERS catalysis for bisphenol A. Compared to the component materials – MoS2 and Fe2O3 – the rate of degradation and sensitivity of the nanocomposite were both enhanced, and could be recovered from a solution via the use of a magnetic field.