超声辅助酸碱改性活性炭纤维对DBT脱硫性能的研究

Study on DBT desulfurization performance with activated carbon fiber modified by ultrasonic assisted acid-alkali

关键词:  活性炭纤维  酸碱溶液  吸附脱硫  二苯并噻吩  脱硫性能

Key words:  activated carbon fiber  acid and alkali solutions  adsorption desulfurization  dibenzothiophene  desulfurization performance

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。 

Abstract:

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.