Department of Materials and Ceramic Engineering/CICECO- Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
Department of Materials and Ceramic Engineering/CICECO- Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
J Hazard Mater. 2016 Nov 15;318:631-640. doi: 10.1016/j.jhazmat.2016.07.059. Epub 2016 Jul 25.
In this study novel porous biomass fly ash-containing geopolymer monoliths were produced using a simple and flexible procedure. Geopolymers exhibiting distinct total porosities (ranging from 41.0 to 78.4%) and low apparent density (between 1.21 and 0.44g/cm(3)) were fabricated. Afterwards, the possibility of using these innovative materials as lead adsorbents under distinct conditions was evaluated. Results demonstrate that the geopolymers' porosity and the pH of the ion solution strongly affect the lead adsorption capacity. Lead adsorption by the geopolymer monoliths ranged between 0.95 and 6.34mglead/ggeopolymer. More porous geopolymers presented better lead removal efficiency, while higher pH in the solution reduced their removal ability, since metal precipitation is enhanced. These novel geopolymeric monoliths can be used in packed beds that are easily collected when exhausted, which is a major advantage in comparison with the use of powdered adsorbents. Furthermore, their production encompasses the reuse of biomass fly-ash, mitigating the environmental impact associated with this waste disposal, while decreasing the adsorbents production costs.
在这项研究中，使用简单灵活的方法制备了新型多孔生物质粉煤灰基地质聚合物整体材料。制备的地质聚合物具有明显的总孔隙率（41.0%至 78.4%）和低表观密度（1.21 至 0.44g/cm³）。之后，评估了这些创新材料在不同条件下作为铅吸附剂的可能性。结果表明，地质聚合物的孔隙率和离子溶液的 pH 值强烈影响铅的吸附容量。地质聚合物整体材料的铅吸附量在 0.95 至 6.34mg 铅/g 地质聚合物之间。更具多孔性的地质聚合物具有更好的铅去除效率，而溶液中较高的 pH 值会降低其去除能力，因为金属沉淀会增强。与使用粉末状吸附剂相比，这些新型地质聚合物整体材料可用于填充床，当它们失效时很容易收集。此外，它们的生产包括再利用生物质粉煤灰，减轻了与这种废物处置相关的环境影响，同时降低了吸附剂的生产成本。
