A composite gel adsorbent for treating heavy metal wastewater, its preparation method and application

Abstract

This application provides a composite gel adsorbent for treating heavy metal wastewater, its preparation method, and its application. The gel is prepared from raw materials including CMCS, modified eggshell membrane powder, AMPS, AA, NaOH, MBAA, HAP, and KPS. The gel in this application possesses a rough mesoporous morphology and abundant surface functional groups, providing ample adsorption sites and diffusion channels for heavy metal ions. The ternary composite gel with modified eggshell membrane exhibits significantly better adsorption performance than the binary composite gel without eggshell membrane, and demonstrates excellent adsorption selectivity in a multi-ion competition system, realizing the high-value utilization of eggshell membrane resources. Furthermore, the maximum adsorption capacities for Ni, Cd, and Cu at an initial concentration of 100 mg / L are 98.28 mg / g, 109.20 mg / g, and 96.50 mg / g, respectively, and the gel reaches adsorption equilibrium for the three heavy metal ions within 15 minutes. This composite gel is simple to prepare, exhibits outstanding selective adsorption performance, and demonstrates excellent adsorption effect, showing broad application potential and prospects in the treatment of heavy metal wastewater.

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