Self-Assembled 3D Flowerlike Iron Oxide Nanostructures and Their Application in Water TreatmentThis work was supported by the National Natural Science Foundation of China (Nos. 20121301, 20473103, 20520140277, and 20575070), the National Key Project on Basic Research (Grant 2006CB 806100 and 2002CCA03100). The Chinese Academy of Sciences is gratefully acknowledged. The authors thank Prof. Chun-Li Bai for discussion. Supporting information is available online from Wiley InterScience or from the author.