Selective nitrate radical adsorbent preparation method

The invention belongs to the field of sewage treatment, and particularly relates to a selective nitrate radical adsorbent preparation method. According to the preparation method, hydrotalcite with anadjustable and controllable interlayer structure and polypyrrole modified montmorillonite are respectively prepared; hydrotalcite is subjected to delaminating separation to form a dispersed lamellar structure; the surface electrical property of a material is changed by utilizing characteristics of adjustable types and adjustable number of the cations of the hydrotalcite polar plate; montmorillonite is intercalated, so that the montmorillonite polypyrrole modification effect is improved, and the adsorption characteristic on nitrate radicals is improved while steric hindrance is formed; and finally the hydrotalcite and the montmorillonite are subjected to composite bonding intercalation to form a layered structure composite material with a certain steric hindrance, wherein the material is applied to adsorption of ni