摘要
采用硝酸作为氧化剂,对树脂基球形活性炭(RCS)表面进行氧化改性,分别考察了氧化时间、氧化温度及硝酸浓度对改性RCS及附脱除油品中二苯并噻吩(DBT)的性能影响。通过N_2吸附、Boehm滴定和热重分析等手段对改性前后的RCS进行表征。实验结果表明:较为经济有效的改性工艺条件为硝酸浓度10 mol/国,氧化温度60℃,氧化时间3 h;改性RCS的比表面积和总孔体积都有所下降;硝酸改性后,RCS的表面酸性基团含量由0.83 mmoL/g提高至3.85 mmol/g;改性前后RCS吸附DBT的等温线可较好地用Freundlich方程进行拟合。
The surface of resin-derived activated carbon spheres（RCS） was modified using nitric acid as oxidant. The factors affecting the adsorption of dibenthiophene（DBT） from oil on the modified RCS were studied. The modified RCS and non modified RCS were characterized by N2 adsorption, Beohm titration and DTG. The economic and effective process conditions for RCS modification are as follows： nitric acid concentration 10 mol/L, oxidation temperature 60 ℃, oxidation time 3 h. The specific surface area and the total pore volume of the modified RCS are both decreased. The content of acid groups on the modified RCS surface is increased from 0.83 mmol/g to 3.85 mmol/g. The adsorption isotherms of DBT on the modified RCS and non modified RCS are both fitted well with Freundlich model.
出处
《化工环保》
CAS
CSCD
北大核心
2012年第5期471-474,共4页
Environmental Protection of Chemical Industry
关键词
活性炭
二苯并噻吩
改性
硝酸
氧化
吸附
activated carbon
dibenthiophene
modification
nitric acid
oxidation
adsorption
