Comparison of activated carbon and iron impregnated activated carbon derived from Golbasi lignite to remove cyanide from water

被引:91
作者
Depci, Tolga [1 ]
机构
[1] Yuzuncu Yil Univ, Fac Engn Architecture, Dept Min Engn, TR-65080 Van, Turkey
关键词
Cyanide; Magnetic activated carbon; Non-linear regression; Turkish lignite; AQUEOUS-SOLUTIONS; WASTE-WATER; ADSORPTION; SORPTION; NANOCOMPOSITE; ISOTHERM; MODELS; PORE;
D O I
10.1016/j.cej.2011.12.003
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The ability of lignite-activated carbon (LAC) and iron-impregnated activated carbon (FeAC) obtained from Golbasi lignite to remove cyanide ions from aqueous solution by adsorption was researched and compared with each other. The same process was applied also with commercial activated carbons which are in both granular (CAC-1) and powder forms (CAC-2). The morphologies, structures and properties of the activated carbons were determined by BET, XRD, XRF, SEM, zeta meter and magnetometer, respectively. The effects of various experimental parameters, such as initial cyanide concentration, pH, adsorbent type and particle size were researched in a batch adsorption technique at a temperature of 25 degrees C. BET surface area of LAC is determined as 921 m(2)/g. The obtained magnetic activated carbon has high surface area of 667 m(2)/g with 19 wt.% Fe3O4 coated and perfect magnetic separation performance. Langmuir model was found to be the best representative for cyanide-adsorption. The maximum monolayer adsorption capacities of LAC and FeAC are 60.18 mg/g and 67.82 mg/g at pH values of 7-7.5 and 64.10 mg/g and 68.02 mg/g at pH values of 10-10.5, respectively. Kinetic evaluation indicated that the cyanide adsorption onto the obtained activated carbons followed the pseudo-second order rate reaction. The diffusion-controlled kinetic models on the cyanide-adsorbent system showed that the removal rate was controlled not only by intraparticle diffusion but also by film diffusion. All experimental results point out that the LAC and FeAC are viable candidates for the removal of cyanide from water and wastewater. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:467 / 478
页数:12
相关论文
共 52 条
[1]   REMOVAL OF CYANIDE FROM SOLUTION USING ACTIVATED CARBON [J].
ADAMS, MD .
MINERALS ENGINEERING, 1994, 7 (09) :1165-1177
[2]   Removal of cyanide from aqueous solution using impregnated activated carbon [J].
Adhoum, N ;
Monser, L .
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 2002, 41 (01) :17-21
[3]   First application of cyanidation process in Turkish gold mining and its environmental impacts [J].
Akcil, A .
MINERALS ENGINEERING, 2002, 15 (09) :695-699
[4]   Managing cyanide: health, safety and risk management practices at Turkey's Ovacik gold-silver mine [J].
Akcil, Ata .
JOURNAL OF CLEANER PRODUCTION, 2006, 14 (08) :727-735
[5]   A New Global Approach of Cyanide Management: International Cyanide Management Code for the Manufacture, Transport, and Use of Cyanide in the Production of Gold [J].
Akcil, Ata .
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW, 2010, 31 (03) :135-149
[6]   Magnetically separable composite photocatalyst with enhanced photocatalytic activity [J].
Ao, Yanhui ;
Xu, Jingjing ;
Shen, Xunwei ;
Fu, Degang ;
Yuan, Chunwei .
JOURNAL OF HAZARDOUS MATERIALS, 2008, 160 (2-3) :295-300
[7]  
Balachandran M., 2004, THESIS U SCI TECHNOL
[8]   Adsorption behavior of copper and cyanide ions at TiO2-solution interface [J].
Barakat, MA .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2005, 291 (02) :345-352
[9]   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
[10]   Equilibrium and kinetic studies on free cyanide adsorption from aqueous solution by activated carbon [J].
Behnamfard, Ali ;
Salarirad, Mohammad Mehdi .
JOURNAL OF HAZARDOUS MATERIALS, 2009, 170 (01) :127-133