Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha, Caixa Postal 486, Belo Horizonte, Minas Gerais, 31970-901, Brazil.
Laboratório de Fisiologia de Plantas Sob Estresse, Departamento de Botânica, Setor de Ciências Biológicas, Universidade Federal Do Paraná, Avenida Coronel Francisco H. Dos Santos, 100, Centro Politécnico Jardim Das Américas, C.P. 19031, Curitiba, 81531-980, Paraná, Brazil.
Environ Pollut. 2023 Jun 15;327:121483. doi: 10.1016/j.envpol.2023.121483. Epub 2023 Mar 27.
Microalgae and Cyanobacteria extracts can be used for the synthesis of spherical silver nanoparticles by the reduction of AgNO under air atmosphere at room temperature. Here, we synthesized AgNPs using extracts of one cyanobacterium (Synechococcus elongatus) and two microalgae (Stigeoclonium sp. and Cosmarium punctulatum). The nature of the AgNPs was characterized by TEM, HR-TEM, EDS, and UV-Vis. Considering the large quantity of functional groups in the ligands of AgNPs, we suppose they could retain ion metals, which would be useful for water decontamination. Thus, their capacity to adsorb iron and manganese at concentrations of 1.0, 5.0, and 10.0 mg L in aqueous solutions was evaluated. All experiments were performed in triplicate of microorganism extract with no addition of AgNO (control) and AgNP colloid (treatment) at room temperature. The ICP analyses showed that the treatments containing nanoparticles were commonly more efficient at removing Fe and Mn ions than the corresponding controls. Interestingly, the smaller nanoparticles (synthesized by Synechococcus elongatus) were the most effective at removing Fe and Mn ions, probably due to their higher surface area:volume ratio. The green synthesized AgNPs proved to be an interesting system for the manufacture of biofilters that could be used to capture contaminant metals in water.
微藻和蓝藻提取物可在空气氛围中于室温下通过还原 AgNO 来合成球形银纳米粒子。在此，我们使用一种蓝藻（长球藻）和两种微藻（Stigeoclonium sp. 和 Cosmarium punctulatum）的提取物来合成 AgNPs。AgNPs 的性质通过 TEM、HR-TEM、EDS 和 UV-Vis 进行了表征。考虑到 AgNPs 配体中大量的功能基团，我们假设它们可以保留离子金属，这对于水的净化将是有用的。因此，评估了它们在水溶液中浓度为 1.0、5.0 和 10.0 mg/L 时吸附铁和锰的能力。所有实验均在没有添加 AgNO（对照）和 AgNP 胶体（处理）的情况下重复进行了三次微藻提取物的实验，在室温下进行。ICP 分析表明，含有纳米粒子的处理通常比相应的对照更有效地去除 Fe 和 Mn 离子。有趣的是，较小的纳米粒子（由长球藻合成）在去除 Fe 和 Mn 离子方面最为有效，这可能是由于其更高的表面积与体积比。绿色合成的 AgNPs 被证明是制造生物过滤器的有趣系统，可用于捕获水中的污染物金属。
