Abstract:

The effects of pH,Al³⁺ and PO^3-₄ on the adsorption of phenol by MnO₂ formed in situ were studied in aqueous solution.The behavior and adsorption mechanism were investigated.The adsorption isotherm was of “S” shape.The adsorption process of phenol on MnO₂ formed in situ was divided into adsorption on the external surface of MnO₂ formed in situ and diffusion to the interior of MnO₂.Phenol adsorption capacity decreased slightly with increasing pH in the range of 6—9，but declined to nearly zero at pH≥10.The presence of a small amount of aluminum ion adsorbed onto the oxide surface changed the surface characteristics, which promoted the adsorption of phenol.Phosphate inhibited the adsorption of phenol by forming a negatively charged complex with phenol.