Sobouti Arash, Rezai Bahram, Hoseinian Fatemeh Sadat
Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran.
Sci Rep. 2025 Jun 1;15(1):19186. doi: 10.1038/s41598-025-04883-8.
The study presents a novel approach to wastewater treatment by utilizing graphene oxide (GO) as a nanocollector for the elimination of manganese (Mn) ions via the ion flotation. GO outperformed traditional collectors, achieving a maximum removal efficiency of 78.1% with optimized GO concentrations. The investigation into the number of GO layers and its Brunauer-Emmett-Teller (BET) surface area revealed that GO with 3-5 layers was most effective, attributed to its larger surface area and BET, which enhance the adsorption capacity. In optimal conditions with 3 to 5 layers of GO, 89.4% of Mn ions were removed. SEM, EDX, WDX, and FTIR confirmed the adsorption of Mn ions onto GO, providing evidence of the ion flotation process's efficacy. GO was also very good at being reused; after three regeneration cycles, it kept more than 85% of its original adsorption capacity. This increased adsorption efficiency while lowering costs. The adsorption mechanism is explained by electrostatic attraction, surface complexation, and ion exchange, which facilitate the binding of Mn ions to the GO surface. This research offers new information about using GO as a nanocollector in ion flotation to eliminate other heavy metal ions for water treatment and addressing environmental problems.
该研究提出了一种新型的废水处理方法，即利用氧化石墨烯（GO）作为纳米捕集剂，通过离子浮选法去除锰（Mn）离子。GO的性能优于传统捕集剂，在优化的GO浓度下，去除效率最高可达78.1%。对GO层数及其布鲁诺尔-埃米特-泰勒（BET）表面积的研究表明，3至5层的GO最为有效，这归因于其较大的表面积和BET，增强了吸附能力。在3至5层GO的最佳条件下，89.4%的Mn离子被去除。扫描电子显微镜（SEM）、能量散射X射线光谱（EDX）、波长色散X射线光谱（WDX）和傅里叶变换红外光谱（FTIR）证实了Mn离子吸附在GO上，为离子浮选过程的有效性提供了证据。GO的可重复使用性也很好；经过三个再生循环后，它仍保持其原始吸附容量的85%以上。这提高了吸附效率，同时降低了成本。吸附机理通过静电吸引、表面络合和离子交换来解释，这些作用促进了Mn离子与GO表面的结合。这项研究提供了关于在离子浮选中使用GO作为纳米捕集剂以去除其他重金属离子用于水处理和解决环境问题的新信息。
