Attapulgite-crosslinked chitosan compound mercury removing adsorbent and solid-phase synthesizing method thereof

The invention belongs to the technical field of treatment of heavy metal wastewater containing mercury and particularly relates to an attapulgite-crosslinked chitosan compound mercury removing adsorbent and a solid-phase synthesizing method thereof. The method utilizes a mode of adding chitosan and glutaraldehyde in batches to finish preparing the attapulgite-crosslinked chitosan compound mercury removing adsorbent. As solubility of the chitosan is limited, the chitosan is added in batches, and the purpose of dissolving the chitosan can be achieved by utilizing residual acid liquor mixed with attapulgite and then replenishing a little organic acid; acid liquor use is reduced at the same time, and industrial production is facilitated. The compound mercury removing adsorbent can be applied to removing mercury ions in wastewater and has excellent adsorbing performance, a simple use method and good regeneration performance. Furthermore, compared with a single chitosan modified material, cost is remarkably reduced