As can be seen from Figure 2 , the F − removal ratio showed an increasing trend with the increase in SA@RM dosage.
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Synthesis of Polymer Sodium Alginate-Red Mud Adsorbent and Its Application in the Removal of Low-Concentration Fluoride.
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The sentences
In contrast the adsorption capacity showed a decreasing trend, with the adsorption capacity decreasing from 0.922 to 0.339 mg·g −1 .
The adsorption capacity of SA@RM showed a trend of increasing and then decreasing with the increase in pH value.