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A series of activated carbons(ACs) were prepared using HNO_3,H_2O_2 and steam as activation agents with the aim to introduce functional groups to carbon surface in the ACs preparation process.The effects of concentration of activation agent,activation time on the surface functional groups and redox property of ACs were characterized by Temperature Program Desorption(TPD) and Cyclic Voltammetry(CV).Results showed that lactone groups of ACs activated by HNO_3 increase with activation time,and the carboxyl groups increase with the concentration of HNO_3.Carbonyl/quinine groups of ACs activated by H_2O_2 increase with the activation time and the concentration of H_2O_2,although the acidic groups decrease with the concentration of H_2O_2.The redox property reflected by CV at 0 and 0.5 V is different with any kinds of oxygen functional groups characterized by TPD,but it is consistent with the SO_2 catalytic oxidization /oxidation properties indicated by TPR.
A series of activated carbons (ACs) were prepared using HNO 3, H 2 O 2 and steam as activation agents with the aim to introduce functional groups to carbon surfaces in the ACs preparation process. The effects of concentration of activation agent, activation time on the surface functional groups and redox property of ACs were characterized by Temperature Program Desorption (TPD) and Cyclic Voltammetry (CV). Results showed that lactone groups of ACs activated by HNO_3 increase with activation time, and the carboxyl groups increase with the concentration of HNO_3.Carbonyl / quinine groups of ACs activated by H 2 O 2 increase with the activation time and the concentration of H 2 O 2, although the acidic groups decrease with the concentration of H 2 O 2. redox property by CV at 0 and 0.5 V is different with any kinds of oxygen functional groups characterized by TPD, but it is consistent with the SO 2 catalytic oxidization / oxidation properties indicated by TPR.