To investigate the photocatalytic activities of heterogeneous systems under visible light, graphitic carbon nitride (g-$$\hbox {C}_{3}\hbox {N}_{4})$$ and chitosan (CS) were chosen as a model system. By solution cast method, $$\hbox {C}_{3}\hbox {N}_{4}$$ were embedded into a CS biopolymer matrix in this study. The purpose is to degrade methyl orange (MO) using a novel $$\hbox {C}_{3}\hbox {N}_{4}$$/CS nanocomposite thin film. Using a visible light-equipped photoreactor with a tungsten incandescent lamp, photo-decolourization of dye was carried out. To catalyse the photodegradation of organic dye pollutant MO, a $$\hbox {C}_{3}\hbox {N}_{4}$$/CS nanocomposite film photocatalyst was found to be successful and a recovery of 100% of the photocatalyst is achieved by a simple new hand-picking technique. Using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy and UV–visible diffuse reflectance spectroscopy, detailed characterization was carried out. $$\hbox {C}_{3}\hbox {N}_{4}$$/CS has high capacity and better photocatalytic activity compared to g-$$\hbox {C}_{3}\hbox {N}_{4}$$ and CS, because $$\hbox {C}_{3}\hbox {N}_{4}$$ possesses a larger surface area and CS has high absorption efficiency which is indicated by the photocatalytic discolouration of MO under visible light irradiation. The $$\hbox {C}_{3}\hbox {N}_{4}$$/CS nanocomposite thin film photocatalyst is regarded as an excellent catalyst with 98% degradation efficiency and is prepared by the simple solution cast method. The total organic carbon value was measured to be 86%. These values evidence that the mineralization of MO was carried out under these conditions.

中文翻译：

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$$\hbox {C}_{3}\hbox {N}_{4}$$ 支持壳聚糖，可简单轻松地回收可见光活性高效光催化剂

为了研究可见光下异质体系的光催化活性，选择石墨氮化碳（g-$$\hbox {C}_{3}\hbox {N}_{4}）$$ 和壳聚糖（CS）作为模型系统。在本研究中，通过溶液浇铸方法，$$\hbox {C}_{3}\hbox {N}_{4}$$ 被嵌入到 CS 生物聚合物基质中。目的是使用新型 $$\hbox {C}_{3}\hbox {N}_{4}$$/CS 纳米复合薄膜降解甲基橙 (MO)。使用配备可见光的光反应器和钨白炽灯，进行染料的光脱色。为了催化有机染料污染物 MO 的光降解，发现 $$\hbox {C}_{3}\hbox {N}_{4}$$/CS 纳米复合膜光催化剂是成功的，并且回收率 100%光催化剂是通过一种简单的新手工挑选技术实现的。使用扫描电子显微镜，透射电子显微镜、X 射线衍射、傅里叶变换红外光谱和紫外-可见漫反射光谱，进行了详细的表征。$$\hbox {C}_{3}\hbox {N}_{4}$$/CS 与 g-$$\hbox {C}_{3}\hbox {N 相比具有高容量和更好的光催化活性}_{4}$$ 和 CS，因为 $$\hbox {C}_{3}\hbox {N}_{4}$$ 具有更大的表面积和 CS 具有高吸收效率，这由光催化作用表明MO 在可见光照射下的变色。$$\hbox {C}_{3}\hbox {N}_{4}$$/CS 纳米复合薄膜光催化剂被认为是一种具有 98% 降解效率的优良催化剂，并通过简单的溶液浇铸法制备。测得的总有机碳值为 86%。