Abstract We report a facile sol-gel synthetic method of graphene oxide (GO) embedded ternary heterostructure nanocomposites of N-TiO2/Ag3PO4@GO with different weight ratios of N-TiO2 to Ag3PO4. XRD, Raman spectroscopy, XPS, TEM, DRS, PL studies and BET surface area analysis are employed for characterization which reveals that the nanocomposite can become an excellent photocatalyst. The material is extensively used in photodegradation of Acid Blue 25 dye. The degradation of the dye is influenced by catalyst load, initial concentration, and solution pH and follows modified Langmuir–Hinshelwood model. Among the different nanocomposites, N-TiO2/Ag3PO4@GO(0.6) exhibit superior photoactivity. The highest photo-degradation of 98% is achieved with a catalyst dose of 1.00 g L−1 for an initial dye concentration of 18 μmol L−1 at pH 3 in 20 min of visible-light illumination. The corresponding L-H first order rate constant (k1) value is found to be 17.26 × 10−2 min−1. A possible mechanism relating to the enhanced visible light absorption, substantial separation of photogenerated electron-hole pairs and faster interfacial charge separation between N-TiO2, Ag3PO4 and GO sheets is proposed.

中文翻译：

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N-TiO2/Ag3PO4@GO纳米复合材料在可见光下光降解有机染料的简易制备

摘要 我们报告了一种简便的溶胶-凝胶合成方法，即氧化石墨烯 (GO) 嵌入 N-TiO2/Ag3PO4@GO 三元异质结构纳米复合材料，其中 N-TiO2 与 Ag3PO4 的重量比不同。XRD、拉曼光谱、XPS、TEM、DRS、PL 研究和 BET 表面积分析用于表征，表明纳米复合材料可以成为一种优良的光催化剂。该材料广泛用于酸性蓝 25 染料的光降解。染料的降解受催化剂负载、初始浓度和溶液 pH 值的影响，并遵循改良的 Langmuir-Hinshelwood 模型。在不同的纳米复合材料中，N-TiO2/Ag3PO4@GO(0.6) 表现出优异的光活性。催化剂剂量为 1 时，光降解率最高可达 98%。00 g L-1，初始染料浓度为 18 μmol L-1，pH 3，可见光照射 20 分钟。发现相应的 LH 一阶速率常数 (k1) 值为 17.26 × 10-2 min-1。提出了与增强的可见光吸收、光生电子-空穴对的显着分离和 N-TiO2、Ag3PO4 和 GO 片之间更快的界面电荷分离有关的可能机制。