超声辅助酸碱改性活性炭纤维对DBT脱硫性能的研究

摘要

以不同浓度和温度的酸碱溶液改性活性炭纤维(ACF),发现8 mol/L、90 ℃的混酸改性ACF对二苯并噻吩(DBT)的脱除效果较好,对其进行了BET、FTIR及Boehm滴定的结构表征.结果表明,改性后ACF的比表面积、孔容和含氧官能团明显增加.将改性后的ACF对DBT 模拟油的脱硫条件进行优化,得到适宜的操作条件为:超声时间80 min,吸附温度50 ℃,吸附时间1.5 h,m(油):m(剂)=100:1,在该条件下,吸附剂的吸附容量可达到49.61 mg/g.改性后的ACF对DBT 有较好的重复使用性,且等温吸附数据的拟合符合Langmuir方程,吸附饱和硫容量可达到57.80 mg/g.%Activated carbon fiber(ACF)was modified with different concentration and temperature of acid and alkali solutions.It was concluded that the ACF modified with 8 mol/L,90 ℃ mixed acid had best removal effects for DBT.The structure of modified ACF was characterized with BET,FTIR and Boehm titration.The results showed that the specific surface area,pore volume and oxygen-containing functional groups of ACF were significantly increased after modification.The absorption capacity of the modified ACF reached 49.61 mg/g under the optimized conditions of ultrasonic time 80 min,adsorption temperature 50 ℃,adsorption time 1.5 h,and mass ratio of oil to adsorbent of 100:1.The modified ACF had good reproducibility to remove DBT,and the fitting of isothermal adsorption data was in accordance with Langmuir equation,the saturated sulfur capacity could reach 57.80 mg/g.