Sayago Uriel Fernando Carreño, Ballesteros Vladimir Ballesteros, Lozano Angelica María
Fundación Universitaria los Libertadores, Bogotá 111221, Colombia.
Polymers (Basel). 2025 Jun 19;17(12):1712. doi: 10.3390/polym17121712.
Cellulose has been identified as a medium for heavy metal removal due to its high adsorption capacity in relation to these contaminants. Furthermore, cellulose is abundant and can be obtained in a practical and easy way. A notable example is biomass, which is abundant in wetlands and has not yet been efficiently and sustainably removed. Another biomass that has been used in heavy metal removal projects is bacterial cellulose. Generating this biomass in a laboratory setting is imperative, given its 100% cellulose composition, which ensures optimal adsorption capacities during the development of heavy metal adsorbent systems. Therefore, the objective of this project was to design biomass adsorbents that combine the properties of bacterial and cellulose for Cr(VI) removal. The rationale for combining these two materials is based on the premise that it will produce optimal results, a hypothesis supported by the documented efficiency of bacterial cellulose and the formidable resilience of biomass to elution processes. The second-order model and the Langmuir isotherm fit proved to be the most suitable, indicating that there an occurred interaction between the adsorption sites of these biomasses and Cr (VI). This suggests the presence of a significant number of active sites on the surface of these materials. The EC(50)+BC(50) biomass, with an adsorption capacity of 42 g of Cr(VI) per dollar, is the most cost-effective due to the low cost of and the high capacity of bacterial cellulose. It is a mixture that guarantees high adsorption capacities and facilitates up to seven reuse cycles through elutions with ethylenediaminetetraacetic acid (EDTA). This finding emphasizes the potential of this material for implementation in environmental sustainability initiatives, particularly those focused on the removal of heavy metals, including Cr(VI).
纤维素因其对这些污染物具有高吸附能力而被确定为一种去除重金属的介质。此外，纤维素资源丰富，且能够以实用且简便的方式获得。一个显著的例子是生物质，它在湿地中大量存在，尚未得到有效且可持续的清除。另一种已用于重金属去除项目的生物质是细菌纤维素。鉴于其100%的纤维素组成，在实验室环境中生成这种生物质至关重要，这确保了在重金属吸附剂系统开发过程中具有最佳吸附能力。因此，本项目的目标是设计结合细菌纤维素和纤维素特性的生物质吸附剂，用于去除六价铬（Cr(VI)）。将这两种材料结合的基本原理基于这样一个前提，即它将产生最佳效果，这一假设得到了细菌纤维素已记录的效率以及生物质对洗脱过程具有强大耐受性的支持。二阶模型和朗缪尔等温线拟合被证明是最合适的，表明这些生物质的吸附位点与Cr(VI)之间发生了相互作用。这表明这些材料表面存在大量活性位点。EC(50)+BC(50)生物质每克的吸附容量为42克Cr(VI)，由于细菌纤维素成本低且吸附容量高，因此是最具成本效益的。它是一种混合物，保证了高吸附容量，并通过用乙二胺四乙酸（EDTA）洗脱实现多达七个重复使用周期。这一发现强调了这种材料在环境可持续发展倡议中实施的潜力，特别是那些专注于去除包括Cr(VI)在内的重金属的倡议。
