Layered double hydroxides (LDHs) or hydrotalcite (HT)-like compounds
with different kinds of metal ions (Mg-Al and Mg-Fe) in the brucite-like
sheets were prepared and their adsorption properties were studied in the
boron removal from aqueous solution under laboratory conditions. The
hydrotalcites were synthesized by the coprecipitation method and were
characterized by chemical analyses, X-ray diffraction (XRD), Fourier
Transform infrared spectroscopy (FTIR) and specific surface area
measurements (BET). The affinity of these materials with a mixture of
B(OH)(3) and B(OH)(4)(-) was studied as a function of contact time,
initial pH of the solutions, HT quantity and B concentration (adsorption
isotherms). It was found that 120 min is enough time for the equilibrium
state to be reached in boron adsorption. Boron removal was independent
of the initial pH of the solutions because of the high buffering
capacity of the LDHs. On the other hand, the adsorption capacity
increases with increasing the adsorbent quantity. The adsorption
isotherms, described by the Langmuir model, are of L-type, suggesting
that B(OH)(4)(-) is adsorbed preferentially on HT-like materials.
Besides, Mg-Al hydrotalcites showed higher adsorption capacity than
Mg-Fe. We proposed that in Mg-Al hydrotalcites, the boron removal occurs
by both adsorption on external surface and ion exchange, whereas for
Mg-Fe it occurs only by surface adsorption. After treatment of a
solution containing 5.2 mgB l(-1) with Mg-Al hydrotalcites the final
boron concentration reached the recommended limit by WHO for drinking
water (0.5 mg l(-1)). (c) 2005 Elsevier Ltd. All rights reserved.
%0 Journal Article
%1 WOS:000234279300010
%A Ferreira, OP
%A de Moraes, SG
%A Duran, N
%A Cornejo, L
%A Alves, OL
%C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
%D 2006
%I PERGAMON-ELSEVIER SCIENCE LTD
%J CHEMOSPHERE
%K (HT)-like boron compounds; double hydroxides; layered removal; treatment} water {hydrotalcite
%N 1
%P 80-88
%R 10.1016/j.chemosphere.2005.04.009
%T Evaluation of boron removal from water by hydrotalcite-like compounds
%V 62
%X Layered double hydroxides (LDHs) or hydrotalcite (HT)-like compounds
with different kinds of metal ions (Mg-Al and Mg-Fe) in the brucite-like
sheets were prepared and their adsorption properties were studied in the
boron removal from aqueous solution under laboratory conditions. The
hydrotalcites were synthesized by the coprecipitation method and were
characterized by chemical analyses, X-ray diffraction (XRD), Fourier
Transform infrared spectroscopy (FTIR) and specific surface area
measurements (BET). The affinity of these materials with a mixture of
B(OH)(3) and B(OH)(4)(-) was studied as a function of contact time,
initial pH of the solutions, HT quantity and B concentration (adsorption
isotherms). It was found that 120 min is enough time for the equilibrium
state to be reached in boron adsorption. Boron removal was independent
of the initial pH of the solutions because of the high buffering
capacity of the LDHs. On the other hand, the adsorption capacity
increases with increasing the adsorbent quantity. The adsorption
isotherms, described by the Langmuir model, are of L-type, suggesting
that B(OH)(4)(-) is adsorbed preferentially on HT-like materials.
Besides, Mg-Al hydrotalcites showed higher adsorption capacity than
Mg-Fe. We proposed that in Mg-Al hydrotalcites, the boron removal occurs
by both adsorption on external surface and ion exchange, whereas for
Mg-Fe it occurs only by surface adsorption. After treatment of a
solution containing 5.2 mgB l(-1) with Mg-Al hydrotalcites the final
boron concentration reached the recommended limit by WHO for drinking
water (0.5 mg l(-1)). (c) 2005 Elsevier Ltd. All rights reserved.
@article{WOS:000234279300010,
abstract = {Layered double hydroxides (LDHs) or hydrotalcite (HT)-like compounds
with different kinds of metal ions (Mg-Al and Mg-Fe) in the brucite-like
sheets were prepared and their adsorption properties were studied in the
boron removal from aqueous solution under laboratory conditions. The
hydrotalcites were synthesized by the coprecipitation method and were
characterized by chemical analyses, X-ray diffraction (XRD), Fourier
Transform infrared spectroscopy (FTIR) and specific surface area
measurements (BET). The affinity of these materials with a mixture of
B(OH)(3) and B(OH)(4)(-) was studied as a function of contact time,
initial pH of the solutions, HT quantity and B concentration (adsorption
isotherms). It was found that 120 min is enough time for the equilibrium
state to be reached in boron adsorption. Boron removal was independent
of the initial pH of the solutions because of the high buffering
capacity of the LDHs. On the other hand, the adsorption capacity
increases with increasing the adsorbent quantity. The adsorption
isotherms, described by the Langmuir model, are of L-type, suggesting
that B(OH)(4)(-) is adsorbed preferentially on HT-like materials.
Besides, Mg-Al hydrotalcites showed higher adsorption capacity than
Mg-Fe. We proposed that in Mg-Al hydrotalcites, the boron removal occurs
by both adsorption on external surface and ion exchange, whereas for
Mg-Fe it occurs only by surface adsorption. After treatment of a
solution containing 5.2 mgB l(-1) with Mg-Al hydrotalcites the final
boron concentration reached the recommended limit by WHO for drinking
water (0.5 mg l(-1)). (c) 2005 Elsevier Ltd. All rights reserved.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND},
author = {Ferreira, OP and de Moraes, SG and Duran, N and Cornejo, L and Alves, OL},
biburl = {https://www.bibsonomy.org/bibtex/2cec52c92baa6076d73e5136d7c8a8396/ppgfis_ufc_br},
doi = {10.1016/j.chemosphere.2005.04.009},
interhash = {e9a2b1445e79bec6e670baf673cbcf96},
intrahash = {cec52c92baa6076d73e5136d7c8a8396},
issn = {0045-6535},
journal = {CHEMOSPHERE},
keywords = {(HT)-like boron compounds; double hydroxides; layered removal; treatment} water {hydrotalcite},
number = 1,
pages = {80-88},
publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
pubstate = {published},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {Evaluation of boron removal from water by hydrotalcite-like compounds},
tppubtype = {article},
volume = 62,
year = 2006
}