Fig. 4From: Silica Aerogel-supported Hydrozincite and Carbonate-intercalated Hydrotalcite for High-efficiency Removal of Pb(II) Ions by Precipitation Transformation ReactionsAdsorption isotherms of Pb(II) on SA-Zn-HZ and SA-Zn3Al-HT (a), Langmuir (b), and Freundlich (c) adsorption isotherm models fitting for Pb(II) adsorption. Experiment conditions: initial Pb(II) concentration 100 ~ 1000 ppm; adsorbent dose 0.5 g L−1; contact time 24 h, solution pH 6.0 ± 0.1; temperature 30 °CBack to article page