Figures of the Article

• The mechanism of “adsorption—reduction—complexation” of Cr by organic matter in soil
• The reduction effect of phenolic hydroxyl groups on Cr(Ⅵ)
• The reduction of Cr(Ⅵ) by Fe(Ⅲ)/Fe(Ⅱ) modified biochar with Fe₃S₄
• The reduction effect of persistent free radicals in organic matter (OM) on Cr(Ⅵ) under light conditions