Preparation method for concave-convex stick clay soil/polyacrylamide composite adsorption agent

The invention discloses a method to prepare an attapulgite clay/polyacrylamide compound adsorbent. Coupling agent is adopted to react with the attapulgite clay to achieve surface functionalization, and thereby, modified attapulgite clay with a hydrophobic vinyl functional group surface is prepared; under the protection of inert gas, graft copolymerization of the modified attapulgite clay and acrylamide is conducted by solution polymerization to achieve compound adsorbent with amido functional group. The preparation method is simple and easy to operate, and has a wide prospect of application; the compound adsorbent has excellent adsorbing performance to mercury and other heavy-metal ions which can have chelate reaction with amido. When pH is 4.4, the adsorptive capacity to mercury ion is 10-15 times higher than the former attapulgite clay; when pH is 2.0, during the adsorption in the mixed-ion solution of mercury and chromium, the adsorbent has sound selective adsorption capacity to Hg .