《化学科学与工程前沿（英文）》
>> 2017年
第11卷
第2期
doi:
10.1007/s11705-017-1630-6
RESEARCH ARTICLE
Surface modification of broom sorghum-based activated carbon via functionalization with triethylenetetramine and urea for CO
Chemical Engineering Department, Babol University of Technology, Shariati Av., Babol, Mazandaran 47148-71167, Iran
录用日期：
2017-03-29
发布日期：
2017-05-12
下一篇
上一篇
摘要
A new type of activated carbon (AC) was synthesized using broom sorghum stalk as a low cost carbon source through chemical activation with H PO and KOH. The AC obtained by KOH had the largest BET surface area of 1619 m ·g and the highest micropore volume of 0.671 cm ·g . CO adsorption was enhanced by functionalizing the AC with two different amines: triethylenetetramine (TETA) and urea. The structure of the prepared ACs was characterized by Brunauer-Emmett-Teller method, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and acid-base Boehm titration analyses. The adsorption behavior of CO onto raw and amine-functionalized ACs was investigated in the temperature range of 288–308 K and pressures up to 25 bar. The amount of CO uptake at 298 K and 1 bar achieved by AC-TETA and AC-urea was 3.22 and 2.33 mmol·g which shows a 92% and 40% improvement compared to pristine AC (1.66 mmol·g ), respectively. Among different model isotherms used to describe the adsorption equilibria, Sips isotherm presented a perfect fit in all cases. Gas adsorption kinetic study revealed a fast kinetics of CO adsorption onto the ACs. The evaluation of the isosteric heat of adsorption demonstrated the exothermic nature of the CO adsorption onto unmodified and modified samples.
京公网安备 11010502051620号
