Industrial Cr(VI) effluents pose persistent environmental threats due to their toxicity and non-biodegradability. This study pioneers a novel functional sludge-derived biochar (SC@BC) synthesized via co-pyrolysis of coking sludge (CS, carbon source) and cold-rolling oily sludge (CROS, iron source) for enhanced Cr(VI) removal. Under optimized conditions (pyrolysis temperature: 800 degrees C, CS:CROS mass ratio = 1:1), SC@BC demonstrated a maximum Cr(VI) adsorption capacity of 161.13 mg/g. Kinetic analysis revealed that the adsorption process followed a pseudo-first-order model, governed by syne...
