Lead ion composite adsorbent and preparation method thereof

The invention discloses a lead ion composite adsorbent and a preparation method thereof, wherein natural polymer chitosan is used as a functional monomer and graphene oxide is used as a modified material, and the lead ion composite adsorbent is prepared by a cross-linking copolymerization method. The preparation process comprises the following steps: 1) preparing a chitosan acetic acid solution; 2) preparing a graphene oxide acetic acid dispersion liquid, mixing the chitosan acetic acid solution, the graphene oxide acetic acid dispersion liquid and lead salt, dropwise adding the mixed liquid into a sodium hydroxide solidification liquid by using an injector to form spheres, performing crosslinking by using glutaraldehyde, eluting the Pb by using an eluent, washing the spheres with water, and drying the spheres to obtain the imprinted lead ion composite adsorbent. The prepared composite adsorbent is millimeter-scale gel microspheres which are regular in shape, developed in pore structure and uniform in pa