Synergetic Oxidation Modification of Wooden Activated Carbon Fiber with Nitric Acid and Ceric Ammonium Nitrate
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 wooden activated carbon fiber(WACF) was immersed 5 h for oxidative modification, 0.005 mol/L to 0.050 mol/L ammonium ceric nitrate and 1.0 mol/L to 7.0 mol/L nitric acid were added, the modification temperature was 23 ℃ to 83 ℃. The surface and structural properties were characterized by XPS, RAMAN, water vapor adsorption and mercury adsorption. The results showed that the average value of oxygen/carbon ratio of modified WACF was 0.160, the content of phenolic groups and alcohol groups increased, it presented an inverse correlation between the content of carboxyeste and the intensity of oxidation. The degree of graphitization on the sample surface reduced slightly, and the degree of graphitization of the sample core increased. The pore volume decreased after synergistic modification, the specific surface area for water adsorption increased significantly. The adsorption capacity for mercury and the specific surface area for water adsorption were linearly related to the concentration of oxygen atoms. Nitric acid can increase the content of functional groups, and has little effect on the structure. While increasing the content of the functional group, ceric ammonium nitrate has a certain adjustment on the structure and pore, and definite selectivity for the adsorbed objects of diffe-rent diameters, which extends the application range of WACF.
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2018, Vol. 32 
