优化操作参数提高赤铁矿-氧化石墨烯纳米复合材料降解亚甲基蓝染料的光催化活性

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-01-10 DOI:10.1140/epjb/s10051-024-00849-3

Anuradha, Arshdeep Singh, Raj Kumar Seth, Praveen Kumar, Sandeep Kumar

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引用次数: 0

摘要

采用共沉淀法和退火法制备了不同氧化石墨烯浓度的α-Fe2O3/rGO纳米复合材料。FESEM研究表明，该复合材料由平均粒径为32.77 nm的准球形α-Fe2O3纳米颗粒组成，分布在皱褶状氧化石墨烯薄片上。此外，FESEM元素映射证实碳是主要成分，占66.26 at.%。研究了不同光催化剂负载、染料浓度、光强和ph条件下纳米复合材料对亚甲基蓝染料的降解效果。当光催化剂负载为0.4 g/L时，染料浓度为5.34µM时效果最好。另一方面，随着负载和染料浓度的进一步增加，纳米复合材料的光催化活性降低。在强光和碱性条件下，纳米复合材料也能有效降解MB染料分子。通过对比Langmuir-Hinshelwood模型得出的降解速率常数值，深入研究了操作参数对纳米复合材料降解效率的影响。此外，还提出了一种合适的机制来解释光催化活性的结果。当初始染料浓度为5.34 μM、高光强、pH为12时，掺杂量为0.4 g/L的纳米复合材料降解效率最高，达到94%。图形抽象

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Optimizing operational parameters for improved photocatalytic activity of hematite–rGO nanocomposites in methylene blue dye degradation

The α-Fe₂O₃/rGO nanocomposites with varying GO concentrations were successfully synthesized utilizing the co-precipitation method followed by annealing. FESEM investigation revealed that the nanocomposites were composed of quasi-spherical α-Fe₂O₃ nanoparticles with an average particle size of 32.77 nm which were distributed on the wrinkled rGO sheets. Further, the elemental mapping of FESEM confirms that carbon is the dominant component with 66.26 at.%. The nanocomposites were studied for degrading methylene blue dye under varying conditions like photocatalyst load, dye concentration, light intensity, and pH. The photocatalyst load of 0.4 g/L gives the best results at the dye concentration of 5.34 µM. On the other hand, as load and dye concentrations increased further, the nanocomposite’s photocatalytic activity reduced. The nanocomposites were also found to be effective in degrading MB dye molecules under high light intensity and alkaline pH. The impact of operational parameters on nanocomposite’s degrading efficiency was examined in depth by contrasting their deterioration rate constant values, which were derived from the Langmuir–Hinshelwood model. Additionally, a suitable mechanism has been mentioned to explain the outcomes of photocatalytic activity. The highest doped nanocomposite with 0.4 g/L load at 5.34 μM initial dye concentration, high light intensity, and pH 12 had the maximum degradation efficiency of 94%.