Abstract： Biochar is a solid product of biomass treated with pyrolysis or gasification, As a renewable resources adsorbent for water treatment, biochar will obtain better environmental benefits. The surface of biochar was modified by physical or chemical methods to improve its target application performance. The modification method of biochar adsorbent was described, the removal effect and mechanism of heavy metals in water by adsorbent were expounded, the effects of pH value of reaction system, reaction temperature and dosage of biochar adsorbent on the adsorption performance of biochar were analyzed, and the current research trends, prospects and research needs are also discussed.
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