Influence of the ratio “porosity-generating agent versus sol” on the adsorption capacity of hydroxyapatite-based materials (HAp) to remove Cd2+ dissolved in water
Keywords:
hydroxyapatite, water decontamination, toxic metals, adsorption processAbstract
Water contamination by toxic metals is one of the main environmental problems. Decontamination can be achieved through the adsorption method, which has technical and economic advantages for industrial applications. This work investigates the synthesis of hydroxyapatite-based materials using food industry waste as raw material. The application for example as adsorbents for toxic metals dissolved in water was also studied. To analyze the physical and chemical properties the materials were characterized by N2 adsorption isotherms and XRD. It was found that the ratio between the amount of porosity-generating agent and the amount of sol (Sol. C) influences the properties of the synthesized materials (i.e. surface area, pore volume, chemical composition). Materials synthesized from mollusk shells showed good adsorption capacity (≈ 70%), and those synthesized from eggshells also achieved high adsorption percentages (≈ 95%), particularly at short residence times. Solid materials with the best adsorption capacities were synthesized from porosity-generating agent to sol ratios of 0.25-0.50. A synergy between physical and chemical properties, crucial for the efficiency of the adsorption process, was determined.
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