This work deals with studying the Composition, structure, and sorbability of the water deironing precipitate sample thermally treated at 850 degrees C (WDP-850) with respect to carbon monoxide. According to the data of X-ray fluorescence (XRF) spectroscopy, WDP-850 contains 44.14% of iron, 6.29% of silicon, and 34.78% of oxygen. The results of X-ray diffraction (XRD) analysis indicate the presence of Fe2O3, Fe3O4, and SiO2 nanocrystallites (similar to 11.4, 30.6, and 8.0%, respectively). The studies performed via the temperature-programmed desorption of CO show that WDP-850 can sorb carbon monoxide at 25 and 200 degrees C. The composition and structure of the precipitate sample obtained after CO adsorption at 200 degrees C (WDP-850-CO) have also been studied. According to XRD data, nearly 9.3% of the silicon carbide (SiC) phase with the moissanite's structure has appeared in the material. The SiC phase is supposed to result from the dissociative adsorption of CO on the surface of WDP-850. It has been concluded that WDP can be used as a base for the synthesis of functional materials, for example, CO sorbents. (C) 2013 Elsevier B.V. All rights reserved.