GUO Xing-mei1, LIU Hai-xing1, YANG Yong-zhen2. Characterization and dispersion of carbon spheres modified by HNO3/H2O2 oxidization in water. New Carbon Mater., 2013, 28(3): 228-234.
Citation:
GUO Xing-mei1, LIU Hai-xing1, YANG Yong-zhen2. Characterization and dispersion of carbon spheres modified by HNO3/H2O2 oxidization in water. New Carbon Mater., 2013, 28(3): 228-234.
GUO Xing-mei1, LIU Hai-xing1, YANG Yong-zhen2. Characterization and dispersion of carbon spheres modified by HNO3/H2O2 oxidization in water. New Carbon Mater., 2013, 28(3): 228-234.
Citation:
GUO Xing-mei1, LIU Hai-xing1, YANG Yong-zhen2. Characterization and dispersion of carbon spheres modified by HNO3/H2O2 oxidization in water. New Carbon Mater., 2013, 28(3): 228-234.
1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology,Taiyuan 030024, China;
2.
Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology),
3.
Ministry of Education, Taiyuan 030024, China;
Funds:
Program for Changjiang Scholar and Innovative Research Team in University (IRT0972); National Natural Science Foundation of China (20971094, 21176169, 51152001); Natural Science Foundation of Shanxi Province (2012011020-03); Ph. D. Programs Foundation of Ministry of Education of China (20101402110007); International S&T Co-operation Program of Shanxi Province (2010081017).
Carbon spheres (CSs) were modified by a mixture of HNO3 and H2O2 with different volume ratios and concentrations to improve their dispersability in a liquid. The morphologies and microstructures of the modified CSs were characterized by field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectrometry and acid-base titration. Results show that the amount and types of oxygen-containing groups can be tuned by the concentration and ratio of HNO3/H2O2. HNO3 favors the formation of carboxyl and carbonyl groups while H2O2 introduces mainly hydroxyl. The amount of oxygen-containing functional groups increases with the concentration of the oxidants when the volume ratio of HNO3/H2O2 is 1, which is as high as 2.164 mmol/g when the concentrations of HNO3 and H2O2 are 16 and 8.8 mol/L, respectively. The resulting CSs have a remarkable dispersability and stability in water.