Li Kun-Quan, Li Ye, Zheng Zheng, Zhang Yu-Xuan
Jiangsu Key Laboratory for Intelligent Agricultural Equipment, College of Engineering, Nanjing Agricultural University, Nanjing 210031, China.
Huan Jing Ke Xue. 2013 Jun;34(6):2479-85.
Mesoporous activated carbons containing acidic groups were prepared with cotton stalk based fiber as raw materials and H3PO4 as activating agent by one step carbonization method. Effects of impregnation ratio, carbonization temperature and heat preservation time on the yield, elemental composition, oxygen-containing acid functional groups and adsorptive capacity of activated carbon were studied. The adsorption capacity of the prepared activated carbon AC-01 for p-nitroaniline and Pb(II) was studied, and the adsorption mechanism was also suggested according to the equilibrium experimental results. The maximum yield of activated carbons prepared from cotton stalk fiber reached 35.5% when the maximum mesoporous volume and BET surface area were 1.39 cm3 x g(-1) and 1 731 m2 x g(-1), respectively. The activated carbon AC-01 prepared under a H3 PO4/precursor ratio of 3:2 and activated at 900 degrees C for 90 min had a total pore volume of 1.02 cm3 x g(-1), a micoporous ratio of 31%, and a mesoporous ratio of 65%. The pore diameter of the mesoporous activated carbon was mainly distributed in the range of 2-5 nm. The Langmuir maximum adsorption capacities of Pb(II) and p-nitroaniline on cotton stalk fiber activated carbon were 123 mg x g(-1) and 427 mg x g(-1), respectively, which were both higher than those for commercial activated carbon fiber ACF-CK. The equilibrium adsorption experimental data showed that mesopore and oxygen-containing acid functional groups played an important role in the adsorption.
以棉秆基纤维为原料、磷酸为活化剂，采用一步碳化法制备了含酸性基团的介孔活性炭。研究了浸渍比、碳化温度和保温时间对活性炭产率、元素组成、含氧酸官能团及吸附性能的影响。研究了制备的活性炭AC-01对对硝基苯胺和Pb(II)的吸附性能，并根据平衡实验结果提出了吸附机理。棉秆纤维制备的活性炭最大产率达到35.5%，此时最大介孔体积和BET比表面积分别为1.39 cm3·g-1和1731 m2·g-1。在磷酸/前驱体比为3:2、900℃活化90 min条件下制备的活性炭AC-01总孔体积为1.02 cm3·g-1，微孔率为31%，介孔率为65%。介孔活性炭的孔径主要分布在2-5 nm范围内。棉秆纤维活性炭对Pb(II)和对硝基苯胺的Langmuir最大吸附容量分别为123 mg·g-1和427 mg·g-1，均高于商业活性炭纤维ACF-CK。平衡吸附实验数据表明，介孔和含氧酸官能团在吸附过程中起重要作用。
