摘要：

由氧化还原法成功合成出了MnO₂/石墨烯（MnO₂/Gh）复合材料。利用SEM、XRD、TGA等技术表征了该纳米粒子的表面形貌、晶型和热稳定性。考察了MnO₂/Gh非均相电-Fenton体系对亚甲基蓝的降解效果。结果表明，在非均相体系中，δ-MnO₂/Gh的催化效果优于γ-MnO₂/Gh，在最优条件下，MnO₂/Gh-0.8非均相电-Fenton体系对亚甲基蓝的去除率可达100%，COD的去除率可达89.61%，与传统的电催化反应相比分别提高了约40.99%和60.68%。该反应主要发生在催化剂的表面，并且循环使用5次后催化效果仅下降了6.37%，具有较高的稳定性。

关键词: 非均相电-Fenton, 石墨烯, MnO₂, 亚甲基蓝

Abstract:

MnO₂/graphene(MnO₂/Gh) hybrids were successfully synthesized by redox method. The surface morphology, crystal morphology and thermal stability of the nanoparticles were characterized by SEM, XRD and TGA, respectively. The performance of MnO₂/Gh heterogeneous electro-Fenton system on the degradation of methylene blue was investigated. The results showed that the catalytic effect of δ-MnO₂/Gh was better than that of γ-MnO₂/Gh in the heterogeneous system. Under optimal conditions, the removal rate of methylene blue in MnO₂/Gh-0.8 heterogeneous electro-Fenton system system reached 100% and the COD removal rate was up to 89.61%, which were about 40.99% and 60.68% higher than those by the traditional electrocatalysis. The reaction mainly occurred on the surface of the catalyst. The catalytic effect decreased by only 6.37% after five cycles of reuse, indicating a higher stability of the catalyst.

Key words: heterogeneous electro-Fenton, graphene, MnO₂, methylene blue

中图分类号: 

• X703