Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India.
Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India.
J Colloid Interface Sci. 2021 Feb 15;584:320-331. doi: 10.1016/j.jcis.2020.09.101. Epub 2020 Oct 6.
A novel visible-light-responsive 2D/2D g-CN/BiNbOCl nano-composite photocatalyst was hydrothermally synthesized using g-CN and BiNbOCl. Various characterization techniques were employed to characterize the as-synthesized g-CN/BiNbOCl nano-composites. The photocatalytic efficiency of the nano-composite materials was assessed by the degradation of an emerging pharmaceutical pollutant, oxytetracycline (OTC), under visible LED light irradiation. It was observed that at an optimum mass ratio of 20% (g-CN to BiNbOCl), the 20g-CN/BiNbOCl nano-composite produced the highest photocatalytic degradation efficiency toward OTC. The photocatalytic degradation of OTC (20 mgL) by 20g-CN/BiNbOCl (1 gL), under 60 min of visible LED light irradiation was 87%, which was about 1.2 and 1.8 times higher as compared to that of pure BiNbOCl and g-CN, respectively. This improved performance was associated with the formation of type-II heterojunction, which resulted in better visible-light absorption and reduced recombination of photogenerated electron-hole pairs. Moreover, it was observed that after four cycles of degradation experiments, the nano-composite was stable. The results of this work not only demonstrate the construction of 2D/2D g-CN/BiNbOCl nano-composite for successful low-cost and energy-efficient photocatalytic degradation of recalcitrant pollutant but also motivate the production of similar photocatalysts targeting environmental remediation.
采用水热法合成了一种新型可见光响应的二维/二维 g-CN/BiNbOCl 纳米复合材料，该复合材料由 g-CN 和 BiNbOCl 组成。采用多种表征技术对合成的 g-CN/BiNbOCl 纳米复合材料进行了表征。通过在可见 LED 光照射下降解新兴的药物污染物土霉素（OTC）来评估纳米复合材料的光催化效率。结果表明，在最佳质量比为 20%（g-CN 与 BiNbOCl 的质量比）时，20g-CN/BiNbOCl 纳米复合材料对 OTC 的光催化降解效率最高。在 60 分钟的可见 LED 光照射下，20g-CN/BiNbOCl（1 g/L）对 OTC（20 mg/L）的光催化降解率为 87%，分别比纯 BiNbOCl 和 g-CN 高 1.2 和 1.8 倍。这种性能的提高与形成 II 型异质结有关，这导致了更好的可见光吸收和减少光生电子-空穴对的复合。此外，观察到在四个降解实验循环后，纳米复合材料是稳定的。这项工作的结果不仅证明了 2D/2D g-CN/BiNbOCl 纳米复合材料的构建成功，用于高效、低成本地光催化降解难降解污染物，而且还激发了针对环境修复的类似光催化剂的制备。
