Effect of MXene Loaded on g-C3N4 Photocatalyst for the Photocatalytic Degradation of Methylene Blue
Effect of MXene Loaded on g-C3N4 Photocatalyst for the Photocatalytic Degradation of Methylene Blue
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DOI：
10.3390/en15030955
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发表时间：
2022-01
期刊：
影响因子：
3.2
通讯作者：
Muhammad Syahmi Irfan Nasri;Mohamad Fakhrul Ridhwan Samsudin;A. Tahir;S. Sufian
中科院分区：
文献类型：
--
作者：
Muhammad Syahmi Irfan Nasri;Mohamad Fakhrul Ridhwan Samsudin;A. Tahir;S. Sufian
光催化降解是处理染料废水的一种环境友好方法。本研究采用湿法浸渍法制备了一系列不同负载量(1、4、8和12wt.%)的MXene/g-C3N4异质结光催化剂，并通过可见光照射下降解亚甲基蓝来评价其光催化活性。因此，与纯g-C3N4相比，1wt.%MXene/g-C3N4异质结光催化剂在180min的可见光照射下对亚甲基蓝的降解率较高。这一显著的改善归功于紧密的界面接触，FESEM分析表明，这使得光滑的光电荷载流子在g-C3N4和MXene之间传输。此外，1wt.%MXene/g-C3N4异质结具有较大的比表面积，使得该样品对染料分子具有较高的吸附能力，并提供了较多的活性中心，这有利于光催化活性的提高。然而，研究发现，过多的MXene负载会严重阻碍光催化活性。FTIR和XRD分析表明，这是由于MXene/g-C3N4异质结晶型光催化剂活性中心的减少和结晶度的减弱所致。综上所述，本研究显示了MXene/g-C3N4光催化剂作为高效废水处理催化剂的潜力。
Photocatalytic degradation is one of the environmentally friendly methods used in treating dye wastewater. In this study, a series of MXene/g-C3N4 heterostructure photocatalysts with different loading amounts of MXene (1, 4, 8, and 12 wt.%) were successfully synthesized via the wet impregnation method and their photocatalytic activity was evaluated via the degradation of methylene blue under visible-light irradiation. As such, the 1 wt.% MXene/g-C3N4 heterostructure photocatalyst achieved a high degradation of methylene blue compared to the pure g-C3N4 under visible-light illumination of 180 min. This significant improvement was attributed to the intimate interfacial contact, evidently from the FESEM analysis, which allows the smooth photocharge carriers to transport between g-C3N4 and MXene. Additionally, the larger BET surface area demonstrated by the 1 wt.% MXene/g-C3N4 heterostructure allowed this sample to have higher adsorption of dye molecules and provided a higher number of reactive sites, which was beneficial for the enhancement of the photocatalytic activity. Nevertheless, it was found that the excessive loading of MXene can substantially impede photocatalytic activity. This was attributed to the decrease in the active sites, as well as the weakened crystallinity of the MXene/g-C3N4 heterostructure photocatalyst, evident from the FTIR and XRD analysis. All in all, this study has shown the potential of the MXene/g-C3N4 photocatalyst as a promising photocatalyst for highly efficient wastewater treatment applications.