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首页> 外文期刊>Applied Surface Science >Green synthesis of AgI-reduced graphene oxide nanocomposites: Toward enhanced visible-light photocatalytic activity for organic dye removal
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Green synthesis of AgI-reduced graphene oxide nanocomposites: Toward enhanced visible-light photocatalytic activity for organic dye removal

机译：AgI还原的氧化石墨烯纳米复合材料的绿色合成：增强可见光去除有机染料的光催化活性

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Novel reduced graphene oxide (RGO) enwrapped AgI nanocomposites were successfully fabricated by a facile template-free ultrasound-assisted method at room temperature. The structural, morphological, and optical studies demonstrate that the obtained nanostructures have good crystallinity and that the graphene nanosheets are decorated densely with AgI nanostructures. The photocatalytic activity of the composite was evaluated by the degradation of an organic dye, Rhodamine B (RhB), under visible-light irradiation. The results indicate that AgI with incorporated graphene exhibited much higher photocatalytic activity than the pure AgI due to the improved separation efficiency of the photogenerated carriers and that it prolonged the lifetime of the electron-hole pairs due to the chemical bonding between AgI and graphene. AgI (0.4 mg mL(-1) of graphene oxide) nanocomposites displayed the highest photocatalytic degradation efficiency and the corresponding catalytic efficiencies within 70 min were similar to 96%. Moreover, with the assistance of H2O2 the photocatalytic ability of the as-obtained AgI-RGO nanocomposites was enhanced. The corresponding catalytic efficiencies within 30 min were similar to 96.8% (for 1 mL H2O2) under the same irradiation conditions. The excellent visible-light photocatalytic efficiency and luminescence properties make the AgI-RGO nanocomposites promising candidates for the removal of organic dyes for water purification and enable their application in near-UV white LEDs. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过一种简便的无模板超声辅助方法，在室温下成功制备了包裹有新型还原氧化石墨烯（RGO）的AgI纳米复合材料。结构，形态和光学研究表明，所获得的纳米结构具有良好的结晶度，并且石墨烯纳米片被AgI纳米结构密集地装饰。在可见光照射下，通过降解有机染料若丹明B（RhB）来评估复合材料的光催化活性。结果表明，由于提高了光生载流子的分离效率，掺入石墨烯的AgI表现出比纯AgI高得多的光催化活性，并且由于AgI和石墨烯之间的化学键合，它延长了电子-空穴对的寿命。 AgI（0.4 mg mL（-1）的氧化石墨烯）纳米复合材料显示出最高的光催化降解效率，在70分钟内相应的催化效率与96％相似。此外，借助于H 2 O 2，增强了所获得的AgI-RGO纳米复合材料的光催化能力。在相同的照射条件下，30分钟内相应的催化效率类似于96.8％（对于1 mL H2O2）。出色的可见光光催化效率和发光性能使AgI-RGO纳米复合材料有望用于水净化去除有机染料，并使其可用于近紫外白光LED。 （C）2015 Elsevier B.V.保留所有权利。

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