Abstract Reduced graphene oxide/zinc oxide-rods composites (RGO/ZnO) were prepared through simple hydrothermal treatment of graphene oxide /zinc peroxide (GO/ZnO2) microspheres. The results of TEM, SEM and XRD show that the rod-like structure ZnO were successfully transformed from ZnO2 microspheres after high temperature treatment and combine well with GO. The synthesized RGO/ZnO-rods composites showed better photocatalytic performance as compared to pure ZnO2, ZnO and GO/ZnO2 under UV and visible-light irradiation. The improved photocatalytic performance of RGO/ZnO-rods composites was attributed to the uniform structure and excellent electrical conductivity of RGO, which could reduce the combination rate of the photo electron-hole pairs. After 5 consecutive cycles of testing, the RGO/ZnO-rods composites still have excellent photocatalytic performance, which was found to depend on ZnO content and NaCl concentration but was not affected by pH. The result of ESR experiment confirmed that the superoxide radicals (O2 −) and hydroxyl radicals (O H) play an important role in the decolorization process of MO. Additionally, the kinetic rate constant (K) and mechanism of RGO/ZnO-rods composites had also been studied.

中文翻译：

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用 RGO 修饰的 ZnO 纳米棒的简便制造以增强染料的光分解

摘要 通过对氧化石墨烯/过氧化锌（GO/ZnO2）微球进行简单的水热处理，制备了还原氧化石墨烯/氧化锌棒复合材料（RGO/ZnO）。TEM、SEM和XRD结果表明，高温处理后的ZnO2微球成功转化为棒状结构的ZnO，并与GO结合良好。与纯 ZnO2、ZnO 和 GO/ZnO2 相比，合成的 RGO/ZnO 棒复合材料在紫外和可见光照射下表现出更好的光催化性能。RGO/ZnO-棒复合材料光催化性能的提高归因于RGO的均匀结构和优异的导电性，这会降低光电子-空穴对的结合率。经过 5 次连续循环测试后，RGO/ZnO-棒复合材料仍然具有优异的光催化性能，这取决于 ZnO 含量和 NaCl 浓度，但不受 pH 值的影响。ESR实验结果证实超氧自由基(O2-)和羟基自由基(OH)在MO的脱色过程中起重要作用。此外，还研究了 RGO/ZnO 棒复合材料的动力学速率常数 (K) 和机理。