School of Engineering Science, Department of Separation Science, LUT University, FI-53850, Lappeenranta, Finland.
School of Engineering Science, Department of Separation Science, LUT University, FI-53850, Lappeenranta, Finland.
Environ Pollut. 2024 Sep 1;356:124322. doi: 10.1016/j.envpol.2024.124322. Epub 2024 Jun 4.
Arsenic is a hazardous element found in water sources, and removing it is crucial for ensuring a safe environment and water quality. Iron-based metal oxides efficiently remove arsenic; however, their small particle sizes make separation from water difficult after arsenic removal. Furthermore, the growing global issue of polymer waste further complicates environmental concerns. Combining three-dimensional (3D) printing and adsorption technology by incorporating nanosized functional materials into supporting polymers offers a potential solution to address both challenges. In this study, we developed a 3D-printed adsorption material through the incorporation of synthesized Fe-Ni bimetallic particles into a supporting polymer using selective laser sintering (SLS) technology. This adsorbent's properties were examined through scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and zeta potential. Furthermore, its performance in removing As(III) and As(V), even at trace levels, was assessed under varied conditions. The 3D-printed adsorbent demonstrated excellent removal of As(III) at pH 6, and As(V) at pH 4, lowering their concentration below 10 μg/L, thereby adhering to the limit established by the World Health Organization (WHO). Both As(III) and As(V) fitted the Freundlich isotherm and pseudo-second-order model, suggesting potential heterogeneous and chemisorption processes. FT-IR indicated that the exchange of the -OH group of Fe-OH with oxyanions of As(III) and As(V) could be the adsorption mechanism. Additionally, thermodynamic evaluation unveiled an endothermic and non-spontaneous adsorption reaction. The 3D-printed adsorbent exhibited excellent reusability across recurring adsorption cycles. The combination of SLS 3D printing with Fe-Ni bimetallic particles produces structures that retain their functionality in removing both arsenic species present in water. This indicates the potential of the 3D-printed adsorbent for effective treatment of arsenic-contaminated water, offering remedies to challenges like handling small particle sizes, mitigating polymer waste, and addressing environmental concerns.
砷是一种存在于水源中的有害元素，去除它对于确保安全的环境和水质至关重要。基于铁的金属氧化物可以有效地去除砷；然而，它们的小颗粒尺寸使得在去除砷后很难从水中分离出来。此外，日益严重的全球聚合物废物问题进一步加剧了环境问题的复杂性。通过将纳米功能材料纳入支撑聚合物中，结合三维（3D）打印和吸附技术，为解决这两个挑战提供了一种潜在的解决方案。在这项研究中，我们通过选择性激光烧结（SLS）技术将合成的 Fe-Ni 双金属颗粒纳入支撑聚合物中，开发了一种 3D 打印吸附材料。通过扫描电子显微镜（SEM）、X 射线衍射（XRD）、傅里叶变换红外（FT-IR）和动电电位对该吸附剂的性能进行了研究。此外，还评估了其在不同条件下去除痕量 As(III)和 As(V)的性能。3D 打印吸附剂在 pH 值为 6 时对 As(III)表现出优异的去除效果，在 pH 值为 4 时对 As(V)表现出优异的去除效果，将其浓度降低到 10μg/L 以下，符合世界卫生组织（WHO）设定的限值。As(III)和 As(V)都符合 Freundlich 等温线和伪二阶模型，表明可能存在非均相和化学吸附过程。FT-IR 表明，As(III)和 As(V)的含氧阴离子与 Fe-OH 的 -OH 基团的交换可能是吸附机制。此外，热力学评估表明这是一个吸热和非自发的吸附反应。3D 打印吸附剂在反复吸附循环中表现出良好的可重复使用性。SLS 3D 打印与 Fe-Ni 双金属颗粒的结合产生了保留其功能的结构，可有效去除水中存在的两种砷物种。这表明 3D 打印吸附剂具有有效处理砷污染水的潜力，为处理小颗粒尺寸、减少聚合物废物和解决环境问题等挑战提供了解决方案。
