【摘 要】
：
A facile,green,cost effective,and template or surfactant free strategy via a two-step route i.e.UV irradiation followed by dissolution-growth for the controlled
【机 构】
：
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China“,”Instit
论文部分内容阅读
A facile,green,cost effective,and template or surfactant free strategy via a two-step route i.e.UV irradiation followed by dissolution-growth for the controlled synthesis of Mn-Co composite nanorings at room temperature was proposed.The nanorings structures and the process were systematically studied via TEM,HRTEM,EDX and XRD.Bir-MnO2 nanosheets first formed through the direct photolysis of KMnO4 under UV light irradiation.This was followed by a dissolution-growth process via the dissolution of Bir-MnO2 nanosheets by the generated H+ from the redox reaction between the added Co(NO3)2 and residual KMnO4,as well as the accompanied formation of CoOOH,and Mn-Co composite nanorings.It was found that a balance between the dissolution and growth rate was needed.Suitable pH,KMnO4 presence and the starting nanosheets like Bir-MnO2 were the key factors for the formation of nanorings.The obtained Mn-Co nanorings/TiO2 showed enhanced efficiency for the catalytic oxidation of HCHO.Based on the above understandings,it is believed that the developed dissolution-growth method can be adopted for the designing and preparation of other Mn-Co composite nanostructures which can be further applied for environmental pollution remediation.
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