In-situ generation of gold nanoparticles on MnO2 nanosheets for the enhanced oxidative degradation o

• 作 者: Xueqin Bao Zhen Qin Tianshu Zh
• 机 构: School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, Chin
• 出 处: 环境科学学报（英文版）
• 发表日期: 2018年3期
• 关键词: MnO2/Au-NPs nanocomposite In-situ generation Dye degradation Synergistic effect

In this work,the gold nanoparticles (Au-NPs) were in-situ generated on the surface of MnO2 nanosheets 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 MnO2 to chloroauric acid (HAuCl4),the pH 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 MnO2 powders (4.3％) and MnO2 nanosheets (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 MnO2 nanosheets and Au-NPs and facilitated the uptake of electrons by MnO2 from 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.