We reported the facile synthesis of new S-scheme 3D NiMoO₄/AgBr nanocomposites photocatalysts and their promising photoactivity for the methylene blue degradation. For efficient separation and transfer of charge carriers, heterojunction construction is desirable. The nickel molybdate heterostructured photocatalysts were fabricated by using facile template free hydrothermal and precipitation methods. The α-phase has doubly ionized vacancies and the β-phase has singly ionized vacancies, which makes the structures promising materials for photocatalytic applications. The fabricated photocatalysts were fully characterized. Photocurrent-time experiments, PL spectroscopy, and EIS were applied for charge carrier transfer, recombination and resistance investigations. Optical behavior of samples was analyzed by DRS technique and Tauc method and effect of different parameters on photoactivity was evaluated. The photocatalytic activity of NiMoO₄/AgBr nanocomposite was larger than that of bare NiMoO₄ and AgBr. Based on quenching method, it can be concluded that holes and hydroxyl radicals were the main active species and according to Langmuir-Hinshelwood kinetics model, the reaction obeyed the pseudo first order kinetics. High photocatalytic activity was related to the synergistic effect induced by formation of 3D NiMoO₄/AgBr nanostructures. Active site on the surface of 3D NiMoO₄/AgBr structure, high surface area, band structure and efficient charge separation and transfer through the NiMoO₄/AgBr, are other effective factors on photodegradation. No morphology and structure changes observed after 4 consecutive cycle which concluded that the nanocomposites are chemically stable and can be used for practical cases.

我们报告了新 S 型 3D NiMoO ₄的简便合成/AgBr 纳米复合光催化剂及其对亚甲基蓝降解的有希望的光活性。为了有效分离和转移电荷载流子，异质结结构是可取的。采用简便的无模板水热和沉淀法制备了钼酸镍异质结构光催化剂。α相具有双电离空位，β相具有单电离空位，这使得该结构成为光催化应用的有希望的材料。制造的光催化剂被充分表征。光电流时间实验、PL 光谱和 EIS 被应用于电荷载流子转移、复合和电阻研究。采用DRS技术和Tauc法分析样品的光学行为，评价不同参数对光活性的影响。₄ /AgBr 纳米复合材料比裸 NiMoO ₄和 AgBr 大。基于猝灭方法，可以得出结论，空穴和羟基自由基是主要的活性物种，根据Langmuir-Hinshelwood动力学模型，反应服从伪一级动力学。高光催化活性与由 3D NiMoO ₄ /AgBr 纳米结构形成引起的协同效应有关。3D NiMoO ₄ /AgBr 结构表面活性位点，高表面积、能带结构和有效的电荷分离和通过 NiMoO ₄转移/AgBr 是其他影响光降解的有效因素。在连续 4 次循环后没有观察到形态和结构变化，这表明纳米复合材料是化学稳定的，可以用于实际情况。