考察了不同结构的活性炭样品对高浓度和低浓度甲苯蒸汽的吸附行为,采用低温(77 K)氮气吸附和129Xe-核磁共振方法对所用活性炭的结构进行了表征.并将活性炭对甲苯的吸附性能与其结构进行了关联.结果表明:孔容积大的活性炭对高浓度甲苯蒸汽吸附容量大,而具有丰富微孔和较小平均孔径的活性炭对低浓度(2×10-5)甲苯蒸汽具有高的吸附容量.沥青基活性炭纤维对低浓度(2×10-5)甲苯蒸汽表现出较好的吸附能力.随着比表面积的增大,活性炭纤维对低浓度(2×10-5)甲苯蒸汽的吸附容量略有增加.OG5A,OG10A,OG15A和OG20A在30 ℃下对2×10-5甲苯蒸汽的饱和吸附容量分别为:202 mg/g,219 mg/g,221 mg/g和235 mg/g.
The toluene adsorption behavior of various activated carbons with different surface areas and pore structures was investigated by a static method at saturation concentration and a dynamic method at low concentration. The pore structures of these activated carbons were characterized by nitrogen adsorption at 77 K and 129Xe-NMR measurements. Results showed that activated carbons with a larger pore volume have the higher toluene adsorption capacity at saturation concentration. But at low concentration, activated carbons with abundant micropores and a narrow pore size have a higher adsorption capacity. Among the investigated samples, pitch-based activated carbon fibers (ACFs) showed a better toluene adsorption capacity at low concentration (2×10-5). With the increase of surface area for ACFs, the toluene adsorption capacities at low concentration (2×10-5) increase slightly and for OG5A, OG10A, OG15A and OG20A at 30 ℃ were 202 mg/g, 219 mg/g, 221 mg/g and 235 mg/g respectively.
参考文献
| [1] | Young-Ki Ryu;Hyun-Jeong Lee;Han-Kyu Yoo;Chang-Ha Lee .Adsorption Equilibria of Toluene and Gasoline Vapors on Activated Carbon[J].Journal of Chemical and Engineering Data: the ACS Journal for Data,2002(5):1222-1225. |
| [2] | 荣海琴,郑经堂.改性PAN-ACFs对甲醛吸附性能的初步研究[J].新型炭材料,2001(01):44-48. |
| [3] | 张丽丹,赵晓鹏,马群,王琪,郭坤敏.改性活性炭对苯废气吸附性能的研究[J].新型炭材料,2002(02):41-44. |
| [4] | 乔志军,李家俊,赵乃勤,魏娜.高温热处理对活性炭纤维微孔及表面性能的影响[J].新型炭材料,2004(01):53-56. |
| [5] | 李建刚,李开喜,凌立成,贺福,吕春祥.成型活性炭的制备及其甲烷吸附性能的研究[J].新型炭材料,2004(02):114-118. |
| [6] | 蔡琼,黄正宏,康飞宇.超临界水和水蒸气活化制备酚醛树脂基活性炭的对比研究[J].新型炭材料,2005(02):122-128. |
| [7] | 解强,张香兰,李兰廷,金雷.活性炭孔结构调节：理论、方法与实践[J].新型炭材料,2005(02):183-190. |
| [8] | 乔文明,宋燕,尹圣昊,持田勲.通过再活化浸渍金属盐的活性炭来发展中孔结构[J].新型炭材料,2005(03):198-204. |
| [9] | 孙新,查庆芳,郭燕生,李兆丰.石油焦系超级活性炭的孔结构控制[J].新型炭材料,2005(03):240-244. |
| [10] | Shin HC.;Park JW.;Park K.;Song HC. .Removal characteristics of trace compounds of landfill gas by activated carbon adsorption[J].Environmental Pollution,2002(2):227-236. |
| [11] | Gregg S J;Sing K S W.Adsorption,surface area and porosity[M].London:Academic Press,1986 |
| [12] | Ryu Zhenyu;Zheng Jingtang;Wang Maozhang;Zhang Bijinang .Characterization of pore size distributions on carbonaceous adsorbents by DFT[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(8):1257-1264. |
| [13] | Popescu M;Joly J P;Carre J et al.Dynamic adsorption and temperature-programmed desorption of VOCs (toluene,butyl acetate and butanol) on activated carbons[J].CARBON,2003,41(04):739-748. |
| [14] | Chuang C L;Chiang P C;Chang E E .Modeling VOCs adsorption onto activated carbon[J].Chemosphere,2003,53(01):17-27. |
| [15] | Song Y;Qiao W M;Yoon S H.Water adsoption behavior of various carbons[A].San Diego,2005 |
| [16] | Mangun CL.;Braatz RD.;Economy J.;Daley MA. .Effect of pore size on adsorption of hydrocarbons in phenolic-based activated carbon fibers[J].Carbon: An International Journal Sponsored by the American Carbon Society,1998(1/2):123-129. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%