Figure 3
Nitrogen adsorption-desorption isotherms (a 1 -d 1 ) and corresponding pore diameter distributions (a 2 -d 2 ) of the mesoporous α-Fe 2 O 3 . The nanoarchitectures were synthesized at different temperatures for 12.0 h, with the molar ratio of FeCl3/H3BO3/NaOH = 2:3:4. Temperature (°C) = 120 (a1, a2); 150 (b1, b2); 180 (c1, c2); 210 (d1, d2). The blue line with blue circles represents the desorption curve; the red line with square rectangles represents the adsorption curve.