Abstract
The biochar adsorbent was prepared at 400, 500 and 600 °C using the discarded Chinese herb residue as raw material to remove the phenol in the waste water. The results of adsorption experiments show that the initial concentration of phenol in wastewater, the preparation temperature of biochar, the temperature and time of adsorption can affect the adsorption effect of biochar on phenol. The adsorption capacity with three kinds of biochar to phenol was BC600> BC500> BC400. When the initial concentration of phenol was 50 mg/L and the temperature was 45 °C, the removal rate of phenol was up to 97% after BC600 adsorption. The isothermal adsorption line for phenol conforms to the Langmuir mode and the Freundlich mode.
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