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(a) Adsorption conversion diagram of Cr6+ by biochar. (I) Cr(VI)0: in the initial solution; (II) Cr(VI)e: no adsorption; (III) Cr(VI)a: adsorption on the biochar surface; (IV) Cr(III)r: reduced Cr3+; (V) Cr(III)r1: adsorbed on the biochar surface in reduced Cr3+; (VI) Cr(III)r2: released into the solution in reduced Cr3+; (VII) Cr(III)r3: ion exchange with K+ in Cr(III)r2. (b) Content variation of Cr6+, Cr3+, and K+ in solution with the adsorption time.
