Figure 3

Effect of initial Cd(II) concentration and temperature on the adsorption of Cd(II) onto four rice straw adsorbents. The fitted results of the Langmuir, Freundlich and Temkin models were represented by a solid, short dot, and dash line, respectively. Sp, rice straw powder; Sa, rice straw ash; Sb, rice straw biochar; Ms, modified rice straw.