As the pH changes, the structure of the dye molecule changes. Under strong acid conditions, the -NH2 in the adsorbent and the anionic dye have chelating effect. The embedding effect of H+ on the -NH2, -SO3 and other groups on the anionic dye molecule and the decolorizing agent will gradually increase, which is not conducive to the adsorption and bridging effect, and the sedimentation rate will decrease, which will affect the decolorization rate.
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