Zanoni Ilaria, Amadori Sara, Brigliadori Andrea, Costa Anna Luisa, Ortelli Simona, Giacò Pierluigi, Baldisserotto Costanza, Pancaldi Simonetta, Blosi Magda
CNR-ISSMC, National Research Council of Italy, Institute of Science, Technology and Sustainability for Ceramics Faenza Italy
Department of Chemical Science, Life and Environmental Sustainability, Parma University Parma Italy.
Nanoscale Adv. 2025 May 12. doi: 10.1039/d5na00236b.
In this work, we combined microalgae's sorptive properties with titania-based nanoparticles' photocatalytic capabilities to develop technologies applicable to wastewater treatment while also providing valuable insights into the innovation of adsorption technologies. The coupling of biomass with an inorganic nanophase enables the formation of hybrid materials integrating heavy metal adsorption with photocatalytic action. To prepare the samples, we employed a water-based colloidal method followed by a spray freeze granulation treatment. The preparation process was followed by comprehensive physicochemical characterization from the wet precursors to the final hybrid granules. Key performance indicators, including adsorption and photocatalytic activity, were assessed using two model contaminants: copper ions (for heavy metal adsorption) and Rhodamine B (for photocatalysis). The results revealed a synergistic effect of the hybrid nanomaterials, significantly enhancing the Cu adsorption capacity of the biomass, which increases from 30 mg g to 250 mg g when coupled with the inorganic phase and is likely due to the supporting and dispersing role of the inorganic nanoparticles on the biomass. The adsorption experimental values followed the Freundlich isothermal model and pseudo-second-order kinetic model, indicating that the adsorption occurred primarily through a multimolecular layer adsorption process, consistent with chemisorption mechanisms. The photocatalytic performance of the inorganic counterpart was preserved when coupled with the microalgae, with TiO-SiO/biomass achieving complete Rhodamine B degradation within 1 hour.
在这项工作中,我们将微藻的吸附特性与二氧化钛基纳米颗粒的光催化能力相结合,以开发适用于废水处理的技术,同时也为吸附技术的创新提供了有价值的见解。生物质与无机纳米相的耦合能够形成将重金属吸附与光催化作用整合在一起的杂化材料。为了制备样品,我们采用了水基胶体法,随后进行喷雾冷冻造粒处理。制备过程之后,对从湿前驱体到最终杂化颗粒进行了全面的物理化学表征。使用两种模型污染物评估了包括吸附和光催化活性在内的关键性能指标:铜离子(用于重金属吸附)和罗丹明B(用于光催化)。结果表明杂化纳米材料具有协同效应,显著提高了生物质对铜的吸附能力,与无机相结合时,铜的吸附量从30 mg/g增加到250 mg/g,这可能是由于无机纳米颗粒对生物质的支撑和分散作用。吸附实验值符合Freundlich等温模型和准二级动力学模型,表明吸附主要通过多分子层吸附过程发生,这与化学吸附机制一致。与微藻结合时,无机对应物的光催化性能得以保留,TiO-SiO/生物质在1小时内实现了罗丹明B的完全降解。