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 concentr...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.展开更多
The travelling wave solutions of a generalized Camassa-Holm-Degasperis-Procesi equation ut-uxxt+(1+b)umux=buxuxx+uuxxx are considered where b>1 and m are positive integers.The qualitative analysis methods of planar...The travelling wave solutions of a generalized Camassa-Holm-Degasperis-Procesi equation ut-uxxt+(1+b)umux=buxuxx+uuxxx are considered where b>1 and m are positive integers.The qualitative analysis methods of planar autonomous systems yield its phase portraits.Its soliton wave solutions,kink or antikink wave solutions,peakon wave solutions,compacton wave solutions,periodic wave solutions and periodic cusp wave solutions are obtained.Some numerical simulations of these solutions are also given.展开更多
基金part of the Innovation Program for Undergraduate supported by China University of Mining & Technology,Beijing.
文摘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.
基金supported by China Postdoctoral Science Foundation(Grant Nos.20100470249,20100470254)
文摘The travelling wave solutions of a generalized Camassa-Holm-Degasperis-Procesi equation ut-uxxt+(1+b)umux=buxuxx+uuxxx are considered where b>1 and m are positive integers.The qualitative analysis methods of planar autonomous systems yield its phase portraits.Its soliton wave solutions,kink or antikink wave solutions,peakon wave solutions,compacton wave solutions,periodic wave solutions and periodic cusp wave solutions are obtained.Some numerical simulations of these solutions are also given.
