Fig. 1. Powder X-ray diffraction patterns of pure magnetite and cellulose–magnetite
samples varying some synthesis parameters. The total iron concentrations are:
0.04 mol l1 (a), 0.4 mol l1 (b) and 0.8 mol l1 (c); precipitation temperatures 25 8C
(a–c); and 70 8C (d); cellulose–C25-magnetite composite (e).