Tea waste as a low cost adsorbent for the removal of Cu and Pb from wastewater

被引:631
作者
Amarasinghe, B. M. W. P. K. [1 ]
Williams, R. A.
机构
[1] Univ Moratuwa, Dept Chem & Proc Engn, Moratuwa, Sri Lanka
[2] Univ Leeds, Inst Particle Sci & Engn, Leeds, W Yorkshire, England
关键词
adsorption; heavy metals; tea waste;
D O I
10.1016/j.cej.2007.01.016
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Adsorption of copper and lead ions onto tea waste from aqueous solutions was studied to enable comparison with alternative commonly available absorbents. Batch experiments were conducted to determine the factors affecting adsorption and kinetics of the process. Fixed bed column experiments were performed to study practical applicability and breakthrough curves were obtained. Tea waste is capable of binding appreciable amounts of Pb and Cu from aqueous solutions. The adsorption capacity was highest at solution pH range 5-6. The adsorbent to solution ratio and the metal ion concentration in the solution affect the degree of metal ion removal. The equilibrium data were satisfactorily fitted to Langmuir and Freundlich isotherms. Highest metal uptake of 48 and 65 mg/g were observed for Cu and Pb, respectively. Pb showed higher affinity and adsorption rate compared to Cu under all the experimental conditions. Kinetic studies revealed that Pb and Cu uptake was fast with 90% or more of the adsorption occurring within first 15-20 min of contact time. The kinetic data fits to pseudo second order model with correlation coefficients greater than 0.999. Increase in the total adsorption capacity was observed when both Cu and Pb ions are present in the solution. Higher adsorption rate and the capacity were observed for smaller adsorbent particles. Tea waste is a better adsorbent compared to number of alternative low cost adsorbents reported in literature. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:299 / 309
页数:11
相关论文
共 58 条
[41]   The role of sawdust in the removal of unwanted materials from water [J].
Shukla, A ;
Zhang, YH ;
Dubey, P ;
Margrave, JL ;
Shukla, SS .
JOURNAL OF HAZARDOUS MATERIALS, 2002, 95 (1-2) :137-152
[42]   Adsorption of Ni(II), Zn(II) and Fe(II) on modified coir fibres [J].
Shukla, SR ;
Pai, RS ;
Shendarkar, AD .
SEPARATION AND PURIFICATION TECHNOLOGY, 2006, 47 (03) :141-147
[43]   Removal of nickel from aqueous solutions by sawdust [J].
Shukla, SS ;
Yu, L ;
Dorris, KL ;
Shukla, A .
JOURNAL OF HAZARDOUS MATERIALS, 2005, 121 (1-3) :243-246
[44]   Removal of heavy metals from solution using dried brown seaweed material [J].
Stirk, WA ;
van Staden, J .
BOTANICA MARINA, 2000, 43 (05) :467-473
[45]   Sunflower stalks as adsorbents for the removal of metal ions from wastewater [J].
Sun, G ;
Shi, WX .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (04) :1324-1328
[46]   REMOVAL OF LEAD, CADMIUM AND ZINC BY WASTE TEA LEAVES [J].
TEE, TW ;
KHAN, ARM .
ENVIRONMENTAL TECHNOLOGY LETTERS, 1988, 9 (11) :1223-1232
[47]  
Treybal R.E., 1980, MASS TRANSFER OPERAT
[48]   Removal of lead and copper ions from aqueous solutions by bacterial strain isolated from soil [J].
Tunali, S ;
Çabuk, A ;
Akar, T .
CHEMICAL ENGINEERING JOURNAL, 2006, 115 (03) :203-211
[49]  
Uzun I, 2000, TURK J CHEM, V24, P291
[50]   Removal of selected metal ions from aqueous solution using modified corncobs [J].
Vaughan, T ;
Seo, CW ;
Marshall, WE .
BIORESOURCE TECHNOLOGY, 2001, 78 (02) :133-139