Enhanced adsorption capacity of activated alumina by impregnation. with alum for removal of As(V) from water

被引:92
作者
Tripathy, Sushree Swarupa [1 ]
Raichur, Ashok M. [1 ]
机构
[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
关键词
adsorption; Arsenic(V); speciation; impregnation; alumina; isotherm; kinetics; EDAX mapping;
D O I
10.1016/j.cej.2007.06.028
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Alum-impregnated activated alumina (AIAA) was investigated in the present work as an adsorbent for the removal of As(V) from water by batch mode. Adsorption study at different pH values shows that the efficiency of AIAA is much higher than as such activated alumina and is suitable for treatment of drinking water. The adsorption isotherm experiments indicated that the uptake of As(V) increased with increasing As(V) concentration from I to 25 mg/l and followed Langmuir-type adsorption isotherm. Speciation diagram shows that in the pH range of 2.8-11.5, arsenate predominantly exists as H2AsO4- and HASO(4)(2-) species and hence it is presumed that these are the major species being adsorbed on the surface of AIAA. Intraparticle diffusion and kinetic studies revealed that adsorption of As(V) was due to physical adsorption as well as through intraparticle diffusion. Effect of interfering ions revealed that As(V) sorption is strongly influenced by the presence of phosphate ion. The presence of arsenic on AIAA is depicted from zeta potential measurement, scanning electron microscopy (SEM) and energy-dispersive analysis of X-ray (EDAX) mapping study. Alum-impregnated activated alumina successfully removed As(V) to below 40ppb (within the permissible limit set by WHO) from water, when the initial concentration of As(V) is 10 mg/l. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:179 / 186
页数:8
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