Abstract Novel a-MnO2/AgBr nanocomposite was synthesized successfully by simple template free metods. Hydrothermal method was applied for shape control fabrication of a-MnO2 and AgBr nanoparticles was loaded by precipitation. Prepared photocatalyststs were characterized physically and chemically by XRD, XPS, FTIR, Raman, EDX, PZC, BET, DRS, PL, PC, TEM and EIS to verify the a-MnO2/AgBr properties and structure. The photoactivity of the prepared photocatalysts was investigated under visible light. Different parameters on activity of visible light activated photocatalysts for methylene blue degradation were investigated and reaction mechanism was proposed based on quenching approach. The observation confirmed that a-MnO2/AgBr has high photocatalytic performance toward dye removal and degradation. The degradation kinetics followed pseudo first order kinetic model. It is found that a-MnO2/AgBr composite exhibits much higher photoactivity than a-MnO2. The high photocataytic activity based on DRS, PL and EIS is ascribed to improved light absorption, efficient separation and transfer of charge carriers through the a-MnO2/AgBr lattice. The PC experiments indicate that the combination of AgBr with a-MnO2 leads to the electron-hole recombination inhibition. The prepared photocatalysts exhibited excellent reusability capability which make them potentially useful in environmental remediation and management.

中文翻译：

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原位合成可见光驱动的 a-MnO2 纳米棒/AgBr 纳米复合材料以增加光诱导电荷分离和增强光催化活性

摘要 采用简单的无模板方法成功合成了新型a-MnO2/AgBr纳米复合材料。水热法用于形状控制制造 a-MnO2，并通过沉淀负载 AgBr 纳米颗粒。通过 XRD、XPS、FTIR、拉曼、EDX、PZC、BET、DRS、PL、PC、TEM 和 EIS 对制备的光催化剂进行物理和化学表征，以验证 a-MnO2/AgBr 的性质和结构。在可见光下研究了制备的光催化剂的光活性。研究了可见光活化光催化剂降解亚甲基蓝的不同活性参数，并基于淬灭方法提出了反应机理。观察证实a-MnO2/AgBr对染料去除和降解具有高光催化性能。降解动力学遵循伪一级动力学模型。发现a-MnO2/AgBr复合材料比a-MnO2表现出更高的光活性。基于 DRS、PL 和 EIS 的高光催化活性归因于改进的光吸收、载流子通过 a-MnO2/AgBr 晶格的有效分离和转移。PC 实验表明 AgBr 与 a-MnO2 的组合导致电子-空穴复合抑制。制备的光催化剂表现出优异的可重复使用能力，使其在环境修复和管理中具有潜在的应用价值。通过 a-MnO2/AgBr 晶格有效分离和转移电荷载流子。PC 实验表明 AgBr 与 a-MnO2 的组合导致电子-空穴复合抑制。制备的光催化剂表现出优异的可重复使用能力，使其在环境修复和管理中具有潜在的应用价值。通过 a-MnO2/AgBr 晶格有效分离和转移电荷载流子。PC 实验表明 AgBr 与 a-MnO2 的组合导致电子-空穴复合抑制。制备的光催化剂表现出优异的可重复使用能力，使其在环境修复和管理中具有潜在的应用价值。