In this work,the gold nanoparticles（Au-NPs）were in-situ generated on the surface of MnO2nanosheets to form MnO2/Au-NPs nanocomposite in a simple and cost-effective way.Multiple experiments were carried out to optimi...In this work,the gold nanoparticles（Au-NPs）were in-situ generated on the surface of MnO2nanosheets to form MnO2/Au-NPs nanocomposite in a simple and cost-effective way.Multiple experiments were carried out to optimize the oxidation of basic dye（Methylene Blue（MB））,including the molar ratio of MnO2to chloroauric acid（HAu Cl4）,the p H of the solution and the effect of initial material.Under the optimal condition,the highest degradation efficiency for MB achieved to 98.9%within 60 min,which was obviously better than commercial MnO2powders（4.3%）and MnO2nanosheets（74.2%）.The enhanced oxidative degradation might attribute to the in-situ generation of ultra-small and highly-dispersed Au-NPs which enlarged the synergistic effect and/or interfacial effect between MnO2nanosheets and Au-NPs and facilitated the uptake of electrons by MnO2from MB during the oxidation,thus validating the application of MnO2/Au-NPs nanocomposite for direct removal of organic dyes from wastewater in a simple and convenient fashion.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21277048 and 21505046)the China Postdoctoral Science Foundation (No. 2016 M590336)+1 种基金the "Chenguang Program" funded by Shanghai Education Development FoundationShanghai Municipal Education Commission (No. 15CG21)
文摘In this work,the gold nanoparticles（Au-NPs）were in-situ generated on the surface of MnO2nanosheets to form MnO2/Au-NPs nanocomposite in a simple and cost-effective way.Multiple experiments were carried out to optimize the oxidation of basic dye（Methylene Blue（MB））,including the molar ratio of MnO2to chloroauric acid（HAu Cl4）,the p H of the solution and the effect of initial material.Under the optimal condition,the highest degradation efficiency for MB achieved to 98.9%within 60 min,which was obviously better than commercial MnO2powders（4.3%）and MnO2nanosheets（74.2%）.The enhanced oxidative degradation might attribute to the in-situ generation of ultra-small and highly-dispersed Au-NPs which enlarged the synergistic effect and/or interfacial effect between MnO2nanosheets and Au-NPs and facilitated the uptake of electrons by MnO2from MB during the oxidation,thus validating the application of MnO2/Au-NPs nanocomposite for direct removal of organic dyes from wastewater in a simple and convenient fashion.
