Preparation of activated carbons from walnut shells via vacuum chemical activation and their application for methylene blue removal

被引:437
作者
Yang, Juan [1 ]
Qiu, Keqiang [1 ]
机构
[1] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China
关键词
Activated carbon; Walnut shell; Vacuum chemical activation; Methylene blue; Adsorption; ZINC-CHLORIDE ACTIVATION; SURFACE-AREA; ZNCL2; ACTIVATION; AQUEOUS-SOLUTION; COCONUT HUSK; DYE REMOVAL; ADSORPTION; SAWDUST; HYDROXIDE; KINETICS;
D O I
10.1016/j.cej.2010.09.019
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Activated carbons were prepared florin walnut shells by vacuum chemical activation with zinc chloride as the activation agent To optimize the preparation method the effects of the main process parameters (such as system pressure activation temperature and impregnation ratio) on the properties (expressed in terms of specific surface area and pore volume) of the obtained activated carbons were studied It was found that the optimum activated carbon obtained with system pressure of 30 kPa activation temperature of 450 C and impregnation ratio of 2 0 has a BET sui face area of 1800 m(2)/g and total pore volume of 1 176 cm(3)/g The prepared activated carbons were characterized by SEM TEM and FTIR Then they were used as an adsorbent for the removal of methylene blue from aqueous solutions The results showed that the methylene blue adsorption capacity was positively correlated to the BET surface area The highest methylene blue adsorption capacity was 315 mg/g for the optimum activated carbon The effect of the dose of the activated carbon was evaluated and the adsorption isotherm of methylene blue was determined Redlich-Peterson and Langmuir-Freundlich models were found to best represent the equilibrium data suggesting heterogeneous surface adsorption of methylene blue on the activated carbon (C) 2010 Elsevier B V All rights reserved
引用
收藏
页码:209 / 217
页数:9
相关论文
共 38 条
[1]   Preparation and characterization of activated carbon from oil palm wood and its evaluation on methylene blue adsorption [J].
Ahmad, A. L. ;
Loh, M. M. ;
Aziz, J. A. .
DYES AND PIGMENTS, 2007, 75 (02) :263-272
[2]   Preparation of activated carbon from Tunisian olive-waste cakes and its application for adsorption of heavy metal ions [J].
Baccar, R. ;
Bouzid, J. ;
Feki, M. ;
Montiel, A. .
JOURNAL OF HAZARDOUS MATERIALS, 2009, 162 (2-3) :1522-1529
[3]   Preparation of high surface area activated carbon from corn by chemical activation using potassium hydroxide [J].
Bagheri, Narges ;
Abedi, Jalal .
CHEMICAL ENGINEERING RESEARCH & DESIGN, 2009, 87 (8A) :1059-1064
[4]   Applicability of the various adsorption models of three dyes adsorption onto activated carbon prepared waste apricot [J].
Basar, Canan Akmil .
JOURNAL OF HAZARDOUS MATERIALS, 2006, 135 (1-3) :232-241
[5]   PREPARATION OF ACTIVATED CARBON BY CHEMICAL ACTIVATION WITH ZNCL2 [J].
CATURLA, F ;
MOLINASABIO, M ;
RODRIGUEZREINOSO, F .
CARBON, 1991, 29 (07) :999-1007
[6]   Preparation and characterization of activated carbon from cotton stalk by microwave assisted chemical activation-Application in methylene blue adsorption from aqueous solution [J].
Deng, Hui ;
Yang, Le ;
Tao, Guanghui ;
Dai, Jiulei .
JOURNAL OF HAZARDOUS MATERIALS, 2009, 166 (2-3) :1514-1521
[7]   Removal of direct blue-86 from aqueous solution by new activated carbon developed from orange peel [J].
El Nemr, Ahmed ;
Abdelwahab, Ola ;
El-Sikaily, Amany ;
Khaled, Azza .
JOURNAL OF HAZARDOUS MATERIALS, 2009, 161 (01) :102-110
[8]  
Freundlich H, 1906, Z PHYS CHEM-STOCH VE, V57, P385
[9]   Dye removal from aqueous solution by adsorption on treated sawdust [J].
Garg, VK ;
Gupta, R ;
Yadav, AB ;
Kumar, R .
BIORESOURCE TECHNOLOGY, 2003, 89 (02) :121-124
[10]   Batch study of liquid-phase adsorption of methylene blue using cedar sawdust and crushed brick [J].
Hamdaoui, Oualid .
JOURNAL OF HAZARDOUS MATERIALS, 2006, 135 (1-3) :264-273