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Abstract Peanut shells as the raw materials were chemical modified by NaOH, and adsorption behavior of peanut shells were compared before and after modification. The influences of the adsorption time, adsorbent dosage, adsorbate concentration, waste water pH value and temperature and other factors on the adsorption of Pb2+ by modified peanut shells were studied. The results show that after modified by NaOH, the surface of peanut shells becomes porous, fluffy structure, conductive to absorption, and the absorption performance has greatly improved. The optimum reaction conditions are adsorption time is 60 minutes, adsorbent dosage is 3g/L, initial concentration of Pb2+ is ≤50 mg/L, wastewater pH is 7, and temperature is 25~55℃, the removal rate of Pb2+ can reach 98.17% when equilibrium adsorption.
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