Journal of Environmental Treatment Techniques 2016, Volume 4, Issue 3, Pages: 62-70
62
Experimental and Kinetic modeling of As (V) adsorption on
Granular Ferric Hydroxide and Laterite
Yacouba Sanou
1
, Samuel Pare
1
*, Nguyen Thi Thanh Phuong
2
, Nguyen Van Phuoc
2
1- Laboratory of Analytical, Environmental and Bio-Organic Chemistry (LCAEBiO), University of Ouaga I, Professor Joseph
KI-ZERBO, URF/SEA, Chemistry Department, 03 BP 7021 Ouagadougou 03. Burkina Faso.
2- Institute for Environment and Resources (IER/ HCMC), Vietnam National University, Vietnam.
Received: 11/02/2016 Accepted: 18/03/2016 Published: 30/06/2016
Abstract
This work aims to study the As (V) removal in aqueous solutions using Granular Ferric Hydroxide (GFH) and Natural
Laterite at ambient temperature. Column experiments were conducted to investigate the As (V) removal mechanism and effects
of parameters affecting the adsorption were studied to follow the adsorption kinetics. Maximum removal of arsenic (99.99% and
99.5%) was achieved at 15 min of contact time with an initial concentration of 20 mg/L using 10 g of GFH and laterite in 50 m l
volume of solution, respectively. From the isotherm models study, i.e. Langmuir, Freundlich and Dubinin - Radushkevich, the
adsorption process in our study followed best Freundlich isotherm. The study of isotherms showed that the adsorption was
physical, spontaneous with GFH while endothermic using laterite, respectively. The kinetics study showed that the adsorption
process fits with a pseudo-second order reaction model using both adsorbents. The adsorption column design was done using
Logit method and the obtained values of adsorption rate coefficient (K) and adsorption capacity coefficient (N) were 3.2 10-4
L/(mg. min) and 8968.46 mg/L, respectively for GFH and 1.43 10-3 L/(mg. min), 977.19 mg/L using laterite. The fixed bed
column studies showed that Granular Ferric Hydroxide and Laterite were efficient in s mall-scale for As (V) removal.
Keywords: Arsenic, Removal, Granular Ferric Hydroxide, Laterite, aqueous solutions.
1-Introduction
1
Arsenic contamination of surface and subsurface waters
is reported in many parts of the world and is considered a
global issue. As a naturally occurring toxic substance in the
earths crust, arsenic enters into aquifers and wells through
natural processes, and to the water cycle as a result of
anthropogenic activities [1]. Arsenic pollution has been
reported in countries such as Bangladesh, USA, west
Bengal, Mexico, Chile, Taiwan and many others [2].
Vietnam and Burkina Faso are among these countries
requiring the research studies.
Its well known that the ingestion of inorganic ars enic
can result in both cancers (skin, lung, liver and urinary
bladder) and non-cancer effects such as melanosis,
hyperkeratosis, and prostate [3]. Population-based studies
showed that arsenite [As (III)] and arsenate [As (V)] that
are inorganic and more toxic forms may adversely affect
several organs in the human body [4]. In Northern of
Burkina Faso, Yatenga Province is known for polluted
groundwater by arsenic. Arsenic pollution in this area was
due to arsenopyrite specie
in bedrock
[5]. SOME et al. [5]
showed that the arsenic concentration in water from tube
Corresponding author: Samuel Pare, Laboratory of
Analytical, Environmental and Bio-Organic Chemistry
(LCAEBiO), University of Ouaga I, Professor Joseph KI-
ZERBO, URF/SEA, Chemistry Department, 03 BP 7021
Ouagadougou 03. Burkina Faso. Tel: +226 25 30 70 64. E-
mail contact: samuel.pare@gmail.com
wells was ranging between 1 and 124 g/L while 87% of
villagers use the water from tube wells. Among the first
recognized consequences from chronic exposure to arsenic
was melanosis, a skin disorder of hyperpigmentation or
keratosis where the skin goes rough and dry with skin
papules [5]. A study in Vietnam on Red Delta River
showed that 48% of ground waters in rural Hanoi area have
arsenic concentrations exceeded Vietnam guideline on
arsenic in drinking water [6].
Some treatment technologies have been developed to
remove arsenic from drinking water and groundwater under
both laboratory and pilot-scale conditions including
coagulation, advanced oxidation processes, ion exchange
and adsorption [7]. However, their implementation inquires
the use of adsorbent such as silicate, clay, ferric hydroxide,
maize cob, rice husk, Activated Carbon and other
composite materials [8]. In addition of these adsorbents,
laterite and Granular F erric Hydroxide have been used in
previous studies by many authors given their particularities
[9, 10]. In Burkina Faso, Granular Ferric Hydroxide has
been tested successfully at laboratory column scale and
found efficient for the arsenic removal [11]. Natural
Laterite from Burkina Faso showed a low arsenic removal
capacity in column experiments [12]. However, Laterite
from Vietnam was tested and found efficient with an
arsenic removal capacity of 600 g/g and 1100 g/g for As
(III) and As (V), respectively [13].
The objective of this present study was to assess the
potential and applicability of Granular Ferric Hydroxide
Journal web
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J. Environ. Treat. Tech.
ISSN: 2309
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1185