Adsorptive Performance of Ni(II) from Aqueous Solutions Using Biochar Made of Phragmites australis by Adding Ammonium Polyphosphate as Flame Retardant

Figure 3

Sorption isotherms of Ni(II) on the BCs. (a) BC-300- samples; (b) BC-400- samples; (c) BC-500- samples.

(a)

(b)

(c)