The adsorption of formaldehyde on bamboo charcoal, before and after modified by potassium permanganate and manganese sulfate was discussed in the present study. The effects of the initial concentration of formaldehyde solution, adsorbent dosage, temperature, and time on the adsorption capacity were analyzed and the surface morphology, specific surface area and functional groups of unmodified and modified bamboo charcoal were characterized by scanning electron microscopy, specific surface area and infrared s...