酸改性活性炭吸附甲苯的性能研究  

Adsorption of Toluene on Activated Carbons with Acid Modified

作　　者：李立清[1] 石瑞[1] 顾庆伟[1] 梁鑫[1] 唐琳[1] 李海龙[1] 马卫武[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《湖南大学学报（自然科学版）》2013年第5期92-98,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(20676154;20976200)

摘　　要：商业活性炭分别经过1mol/L的硝酸、盐酸、硫酸处理.采用Boehm滴定、傅式转换红外光谱仪(FTIR)、比表面积分析仪对活性炭样品的物化性质进行测试.以甲苯为吸附质,在283K下进行了固定床吸附实验.研究讨论了改性前后活性炭对甲苯的吸附量影响,计算了相应的动力学参数和吸附能.结果表明:酸改性可以增加活性炭表面酸性官能团的总数量;改变孔径分布.酸改性活性炭对甲苯的吸附量大小顺序为:N-AC,S-AC,AC,Cl-AC.准二阶动力学方程比准一阶动力学能更好地描述甲苯在改性活性炭上的吸附过程;酸改性增大了微孔占有率,提高了吸附速度;酸改性增大活性炭吸附有机气体的吸附能,导致酸改性活性炭与甲苯结合度降低.Commercially activated carbon was treated with lmol/L nitric acid, lmol/L sulfuric acid and lmol/L hydrochloric acid respectively. The physicochemical properties of these modified activated carbons were described with Boehm titration, Fourier transformed infrared spectroscopy （FT1R） and BET surface area measurement. Fixed-bed adsorption experiments were conducted under the same experimental conditions at 283K, where toluene was activated as adsorbates. Adsorption capacity on modified activated carbons was conducted, combining the calculation of dynam- ics and adsorption energy. The results have shown that the total amount of acid groups increased after acid modifica- tion and the pore size distribution is different from the unmodified activated carboru The adsorption capacity of toluene on acid modified activated carbon shows the following order. N-AC, S-AC, AC, C1-AC. The pseudo- second-order ki- netic equation is better than the pseudo-first-order kinetic equation to describe the adsorption process of toluene on the modified activated carbons. Acid modification can increase the percentage of micropore and enhance the rate of adsorp- tion. With the increase of adsorption energy, it is hard for the modified activated carbons to join toluene.

关 键 词：改性活性炭 表面基团 孔结构 吸附动力学 吸附能 

分 类 号：O613.71[理学—无机化学]