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This study aims to investigate the impacts of pH, inorganic fractions and dissolved organic carbon (DOC) on pentachlorophenol (PCP) adsorption on reed biochars prepared by pyrolysis temperatures ranging from 300 °C to 600 °C, as well as illustrating the adsorption mechanisms. The adsorption capacities for PCP on acid-washed reed biochars were higher than that of original reed biochars. The dedication of neutral PCP molecules (PCP⁰) and ionized PCP species (PCP⁻) to the overall adsorption at pH 3.0–12.0 was calculated. The relative contribution of PCP⁰ was above 53.4% at pH 3.0–5.0, and PCP⁻ was dominant for adsorption at pH 6.0–12.0 with the contributions of 43.2%-100%. The inorganic fractions in the biochars present the negligible or negative effect on PCP adsorption due to its high hydrophilic. The water extractable DOC decreased the adsorption capacity of PCP on reed biochars. The …