Patent ID: 8834982
Filing Date: 2014-09-16
Classification: B82Y,C01B,Y10T

Abstract:
1. A method for preparing a carbon nanoring composed of monolayered or multilayered coaxial carbon rings, wherein the carbon nanoring has a structure similar to that of a closed ring system formed by graphite sheet being rolled, and an axial dimension of the carbon nanoring is 0.5 to 1.0 nm and a radial dimension of the carbon nanoring is 2 to 30 nm, the method including the following steps: (1) a mixed-salt solution is prepared by mixing a soluble salt of divalent metal ion M the mixed-salt solution is mixed with an alkaline solution and reacts with each other for crystallization at 60-80° C. for 6-10 hours, under the protection of nitrogen gas, to give a suspension, the suspension is filtered and washed with deionized water to obtain a filtrate having a pH of 7-7.5, and then a filter cake is dried at 50-60° C. for 6-12 hours to give a layered double hydroxides of intercalation structure having a chemical composition represented by the following general formula: where, x is 0.2-0.33, α is 0.5-4, and β is 0.5-2; (2) the layered double hydroxides of intercalation structure is calcined for 0.5-3 hours in an inert atmosphere or a reducing atmosphere to give a calcined product, wherein the inert atmosphere is nitrogen gas or argon gas, the reducing atmosphere is hydrogen gas, and the calcination temperature is 600-800° C.; (3) the calcined product is placed in a nitric acid solution with the solid-liquid ratio of 2-5 g/L and subjected to the ultrasonic treatment for 0.5-2 hours, the solution is removed by using centrifugal separation, and then a precipitate obtained by centrifugal separation is washed with deionized water to obtain a filtrate having a pH of 6.5-7 and is dried at 50-60° C. for 6-12 hours to obtain the carbon nanoring.