Abstract：Humic acid (HA) is one of the most abundant organic substances in natural water. In the practical application of materials. However, the exist of HA can also enhance the performance of materials in some special cases. Based on this, in this paper, HA modified biochar (HCSs) was prepared by crayfish shell biochar (CS) which was modified by HA, and applied to adsorb methylene blue (MB) in water. The results showed that the adsorption capacity of modified HCSs for MB (370.6 mg/g) was higher than that of CS (252.0 mg/g), which indicated that the presence of HA in water could promote the adsorption and removal of MB by CS, and HA in water was also removed (> 30%). Further analysis shows that the adsorption of MB on CS is mainly heterogeneous chemical adsorption, and the addition of HA can effectively improve the content of hydroxyl functional groups on the surface of biochar, thus improving the chemical adsorption capacity of CS.
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