The adsorption effect of magnesium modified corncob biochar,steel slag powder and their com-bination on phosphorus-containing simulated wastewater was investigated.The results showed that the bio-char produced by 5 g corncob powder modified by 10 mL of 1.5 mol/L MgCl2 in muffle furnace with py-rolysis temperature of 450℃could adsorb phosphorus.The addition of steel slag powder and magnesium modified corncob biochar is composed of 14 g/L steel slag powder and 4 g/L magnesium modified corncob biochar.The adsorption effect of the combination of steel slag powder and magnesium modified corncob biochar on phosphorus was better than that of the combination of steel slag powder and magnesium modi-fied corncob biochar,the removal rate was up to 98%and the adsorption reached equilibrium in 60 min,and the adsorption equilibrium time was shorter than that of the combination of the two materials.Com-bined dosage adsorption quasi-second-order adsorption kinetics model and Langmuir isothermal adsorption equation,the maximum theoretical adsorption capacity is 0.12 mg/g.
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