Fig. 1. X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, 10-2 M Al, pH 4.0, and Fe(II)/Al molar ratio = 0 after aging for (a) 1 d, (b) 1 wk, (c) 2 wk, (d) 3 wk, and (e) 4 wk.
Fig. 1. X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, 10-2 M Al, pH 4.0, and Fe(II)/Al molar ratio = 0 after aging for (a) 1 d, (b) 1 wk, (c) 2 wk, (d) 3 wk, and (e) 4 wk.