Influence of activated carbon characteristics on toluene and hexane adsorption: Application of surface response methodology

被引:37
作者
Teresa Izquierdo, Ma [1 ]
Martinez de Yuso, Alicia [2 ]
Valenciano, Raquel [2 ]
Rubio, Begona [1 ]
Rosa Pino, Ma [2 ]
机构
[1] ICB CSIC, Inst Carboquim, Zaragoza 50018, Spain
[2] Univ San Jorge, Zaragoza 50830, Spain
关键词
Toluene adsorption; Hexane adsorption; Activated carbon; Surface response; DISTRIBUTIONS; CHEMISTRY; VOLUME; GASES;
D O I
10.1016/j.apsusc.2012.10.023
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The objective of this study was to evaluate the adsorption capacity of toluene and hexane over activated carbons prepared according an experimental design, considering as variables the activation temperature, the impregnation ratio and the activation time. The response surface methodology was applied to optimize the adsorption capacity of the carbons regarding the preparation conditions that determine the physicochemical characteristics of the activated carbons. The methodology of preparation produced activated carbons with surface areas and micropore volumes as high as 1128 m(2)/g and 0.52 cm(3)/g, respectively. Moreover, the activated carbons exhibit mesoporosity, ranging from 64.6% to 89.1% the percentage of microporosity. The surface chemistry was characterized by TPD, FTIR and acid-base titration obtaining different values of surface groups from the different techniques because the limitation of each technique, but obtaining similar trends for the activated carbons studied. The exhaustive characterization of the activated carbons allows to state that the measured surface area does not explain the adsorption capacity for either toluene or n-hexane. On the other hand, the surface chemistry does not explain the adsorption results either. A compromise between physical and chemical characteristics can be obtained from the appropriate activation conditions, and the response surface methodology gives the optimal activated carbon to maximize adsorption capacity. Low activation temperature, intermediate impregnation ratio lead to high toluene and n-hexane adsorption capacities depending on the activation time, which a determining factor to maximize toluene adsorption. (C) 2012 Elsevier B. V. All rights reserved.
引用
收藏
页码:335 / 343
页数:9
相关论文
共 26 条
[1]  
[Anonymous], 2009, 112009 EEA OFF OFF P
[2]  
[Anonymous], 1998, COMPOSES ORGANIQUES
[3]  
[Anonymous], 2009, 82009 EEA OFF OFF PU
[4]   THE DETERMINATION OF PORE VOLUME AND AREA DISTRIBUTIONS IN POROUS SUBSTANCES .1. COMPUTATIONS FROM NITROGEN ISOTHERMS [J].
BARRETT, EP ;
JOYNER, LG ;
HALENDA, PP .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1951, 73 (01) :373-380
[5]   SOME ASPECTS OF THE SURFACE-CHEMISTRY OF CARBON-BLACKS AND OTHER CARBONS [J].
BOEHM, HP .
CARBON, 1994, 32 (05) :759-769
[6]   Surface oxides on carbon and their analysis: a critical assessment [J].
Boehm, HP .
CARBON, 2002, 40 (02) :145-149
[7]   On a theory of the van der Waals adsorption of gases [J].
Brunauer, S ;
Deming, LS ;
Deming, WE ;
Teller, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1940, 62 :1723-1732
[8]   Adsorption of gases in multimolecular layers [J].
Brunauer, S ;
Emmett, PH ;
Teller, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1938, 60 :309-319
[9]   Impact of surface characteristics of activated carbon on adsorption of BTEX [J].
Daifullah, AAM ;
Girgis, BS .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2003, 214 (1-3) :181-193
[10]   Waste materials for activated carbon preparation and its use in aqueous-phase treatment:: A review [J].
Dias, Joana M. ;
Alvim-Ferraz, Maria C. M. ;
Almeida, Manuel F. ;
Rivera-Utrilla, Jose ;
Sanchez-Polo, Manuel .
JOURNAL OF ENVIRONMENTAL MANAGEMENT, 2007, 85 (04) :833-846