材料期刊网

以棉花秸秆为原材料,采用＂炭化-活化＂工艺制备了高活性活性炭。研究了活性炭对苯酚、苯胺和苯甲酸等3种芳香族有机污染物的吸附过程动力学及热力学;测定了不同温度下该活性炭对3种污染物的吸附等温线。研究结果表明棉秸秆活性炭对苯酚、苯胺和苯甲酸的吸附过程均符合Lagergren二级吸附动力学方程;表观吸附活化能分别为Ea（苯酚）=15.91kJ/mol、Ea（苯甲酸）=12.56kJ/mol、Ea（苯胺）=11.16kJ/mol;吸附过程为自发的放热熵减过程;吸附等温模型符合Freundlich等温式;棉秸秆活性炭对苯酚、苯胺和苯甲酸的静态饱和吸附容量分别为450、321和298mg/g。棉秸秆活性炭制备简便、成本低廉,对水溶性有机污染物去除效果较好,可用于芳香族有机污染物的吸附治理。

A synthesise method of highly adsorptive activated carbon from an agricultural by-product （cotton stalk） was developed. The adsorption of the water soluble aromatic contaminations （phenol, aniline and benzoic acid） by cotton stalk activated carbon was investigated under different experimental conditions, including pH, contact time, temperature and initial concentration. Results showed that the kinetic experimental data correla ted well with the pseudo-second-order model. The adsorption capacity was decreased as the temperature in creased and the adsorption pattern on the activated carbon fitted Freundlich isotherms very well. The values of apparent activation energy for the adsorption were calculated, which Ea（phenol） was 15.91kJ/mol, Ea（benzoic acid, was 12.56kJ/mol and Ea（aniline） was ] 1. 16kJ/mol. The adsorption process was found to be spontaneous, exothermic and entropy reduction. The static saturated adsorption capacity of the cotton stalk activated carbon for phenol, aniline and benzoic acid were 450,321 and 298mg/g, respectively. Cotton stalk activated carbon has many ad- vantages over conventional activated carbon, which can make it useful in the treatment of aromatic organic pol lutants.