催化石墨化法活性炭电吸附材料的优化制备工艺

Optimum process for preparation of activated carbon electrosorption electrode by catalytic graphitization

以辣椒秸秆基活性炭(AC)为前驱体,Ni(NO3)2·6H2O为催化剂,探究电吸附过程中催化石墨化活性炭(GAC)电极材料的最佳工艺参数,通过BET、SEM、TEM、XRD、比表面积及孔径分析仪等对所制备活性炭的结构与性能进行表征。分析可知,在Ni∶AC质量分数为0.2%,热处理温度700℃时制得的GAC电极材料的BET比表面积为743.429m^2/g,比电容为262.595F/g。GAC中存在微孔及相当数量的介孔结构,其(002)晶面层间距d002和微晶尺寸Lc分别为0.340nm,11.523nm,石墨化度为0.46。通过催化石墨化法制备活性炭电极材料具有较高的石墨化度,提高了电极的性能,有利于电吸附的进行。

Taking pepper-based activated carbon(AC)as precursor and Ni(NO 3)2·6H 2O as catalyst,the optimal process parameters of catalytically graphitized activated carbon(GAC)electrode material during electrosorption were investigated.The surface structure and properties of the prepared catalytic graphitized activated carbon electrode materials were characterized by specific surface area,scanning electron microscope,transmission electron microscope,X-ray powder diffractometer and aperture analyzer.The response surface analysis results show that when the mass ratio of catalyst to activated carbon is 0.2%,the heat treatment temperature 700℃,the specific surface area of the graphitized activated carbon electrode material prepared by catalytic graphitization is 743.429 m^2/g,and the specific capacitance is 262.595 F/g.the pore size distribution structure of the sample prepared under this condition has a total pore volume of 0.547 cm^3/g and an adsorption average pore diameter of 2.941 nm.There are micropores and a considerable number of mesoporous structures.The(002)crystal plane spacing d 002 and the crystallite size L c of the sample are 0.340 nm and 11.523 nm,respectively.The degree of graphitization is 0.46.The graphitized activated carbon electrode material prepared by catalytic graphitization has higher graphitization degree,improves the performance of the electrode,and is beneficial to the electrosorption.