Surface Oxidation Modification of Wooden Activated Carbon Fibers with Nitric Acid
GAO Wei1,2, ZHAO Guangjie1
1 College of Materials Science and Technology, Beijing Forestry University, Beijing 100083; 2 College of Resources, Environment and Materials, Guangxi University, Nanning 530004
Abstract: The surface oxidation of wooden activated carbon fibers (WACF) by nitric acid can increase the content of oxygen-containing functional groups and contribute to the functional utilization of WACF. Samples were treated with different nitric acid concentration, temperature and soaking time, and then the performance characteristics were characterized by Raman, XPS, water adsorption and mercury adsorption. The results showed the enhancement of nitric acid oxidation increased the proportion of oxygen atoms. The content of phenol and alcohol functional groups rose with the increase of nitric acid concentration, and reduced with the increase of soaking time. The content of hydroxyl group increased significantly with the increase of soaking time. The graphitization degree on the surface of WACF rose with the increase of nitric acid concentration, and the graphitization degree in the core increased as a whole, but it was not affected by the concentration gradient. The water adsorption pore volume of WACF decreased and the specific surface area of water adsorption rose remarkably after nitric acid modification. The adsorption amount of WACF on HgCl2 grew with the increase of nitric acid concentration, temperature and oxidation time. On the basis of the adsorption capacity of WACF, the internal rules of surface structure and chemical properties of water adsorption and mercury adsorption are revealed through the cha-racterization of morphology, crystal structure and surface functional groups, which have significant guidance for the functional utilization of WACF.
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2018, Vol. 32 
