Removal of As(V) and As(III) by reclaimed iron-oxide coated sands

Hsu, Jia-Chin; Lin, Chien‐Jung; Liao, Chih‐Hsiang; Chen, Shyi-Tien

doi:10.1016/j.jhazmat.2007.09.031

Cited by 95 publications

(48 citation statements)

References 26 publications

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“…where C e corresponds to the residual concentration of As(III) ions in the solution at equilibrium (µg/ᐉ), K F and 1/n are characteristic constants that can be related to the relative adsorption capacity of the adsorbent and the intensity of adsorption, respectively, q m is a measure of monolayer adsorption capacity (µg/g) and K L is a constant related to the free energy of adsorption (Borah et al 2008(Borah et al , 2009Chutia et al 2009;Faghihian and Nejati-Yazdinejad 2009a,b;Gupta and Ghosh 2009;Kul and Caliskan 2009;Banerjee et al 2008;Hsu et al 2008;Partey et al 2008;So et al 2008;Jeong et al 2007;Ohe et al 2005;Thirunavukkarasu et al 2003). To assess the extent to which the kinetic and adsorption isotherms equations fit the experimental data, two different error functions were examined.…”

Section: Adsorption Equilibriummentioning

confidence: 99%

Adsorption of As(III) Ions onto Iron-Containing Waste Sludge

Negrea

Lupa

Ciopec

et al. 2010

Adsorption Science & Technology

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ABSTRACT:The adsorption performance of a low-cost adsorbent (IS), viz. an iron-containing waste sludge arising during a hot-dip galvanizing process, towards the removal of As(III) ions from synthetic aqueous solutions and natural underground water was examined. The adsorption process was best described by the pseudo-second-order kinetic equation. The equilibrium adsorption data were well described by the Langmuir model. The value of the dimensional separation factor, R L , indicated favourable adsorption. The maximum adsorption capacity of IS was 625 µg As(III)/g. The variation in the extent of adsorption with temperature was used to evaluate the thermodynamic parameters for the adsorption process. The values of ∆H 0 and ∆G 0 obtained demonstrated that the adsorption process was exothermic and spontaneous. The studied material exhibited an excellent As(III) ion adsorption performance from both synthetic solutions and a natural water sample. Moreover, no secondary contaminated substances arise if the exhausted adsorbent is recycled (e.g. in glass applications).

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Section: Adsorption Equilibriummentioning

confidence: 99%

Adsorption of As(III) Ions onto Iron-Containing Waste Sludge

Negrea

Lupa

Ciopec

et al. 2010

Adsorption Science & Technology

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“…More than 50 household treatment technologies exist worldwide for water pollution removal (24). Arsenic removal by low-cost adsorbents, such as filter based granulated adsorbents, has been the most promising technique, which meets all the mentioned criteria offering reliable and efficient performance for communities living in scattered settlements (8,25,27). However, natural adsorbents are favorable for their low-cost and abundant sources, yet, some studies have shown that they had no sufficient capacity to remove total arsenic (As (III) + As (V)) from water resources (28,29).…”

Section: Introductionmentioning

confidence: 99%

Removal of Arsenic and Coliform Bacteria by Modified Sand Filter With Slag and Zeolite from Drinking Water

et al. 2017

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Background: Among the various adverse pollutants in water, coliform bacteria and arsenic are very important. Drinking of arseniccontaminated water has become a serious threat to public health and has affected millions of people across the world. Objectives: The aim of this study was to investigate the removal of arsenic and coliform bacteria from drinking water in small communities with the use of a conventional Slow Sand Filter (SSF) and modified filter by slag (SMF) and Zeolite (ZMF). Methods: In this study, initial concentrations of arsenic were 0.073, 0.11, 0.171, 0.21, 0.24, and 0.33 mg/l and the initial number of coliform bacteria was 4*10 6 MPN/100 mL. Arsenic and coliform bacteria samples were taken every 24 and 48 hours, respectively.

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“…Many adsorbents have been reported in the literature for the removal of As(V) such as red mud (Genc-Fuhrman et al 2004), iron-modified bamboo charcoal (Liu et al 2012), mesoporous alumina (Han et al 2013), iron-coated rice husk (Pehlivan et al 2013), granular activated carbonbased iron-containing adsorbents (Gu et al 2005), magnesia or manganese-loaded fly ash cenospheres , iron-oxide-coated sand (Hsu et al 2008), natural and iron-modified zeolite (Baskan and Pala 2011), and clays (Wainipee et al 2013). However, the use of these adsorbents for the removal of As(V) has some limitations due to the disposable of spent media, technical difficulties for the preparation of these adsorbents, and removal of coexisting ions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of arsenic(V) from aqueous solutions by goethite/silica nanocomposite

Attinti

Sarkar

Barrett

et al. 2015

Int. J. Environ. Sci. Technol.

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Silica nanoparticles were synthesized and coated with goethite, creating a nanocomposite. The nanocomposite was tested for removal of arsenic, As(V), from aqueous solutions. We used scanning electron microscopy (SEM), Fourier transform infrared spectrometry, and a Zetasizer to characterize particle size, surface morphology, functional groups, and surface charge of the nanocomposite. SEM results showed that the size of the synthesized silica nanoparticles ranged from 150 to 250 nm. Batch sorption studies were carried out on the adsorption of As(V) as a function of pH, contact time, initial concentration, and ionic strength. Maximum adsorption occurred at pH 3.0. The adsorption capacity did not change significantly with increasing ionic strength. A kinetics study revealed that adsorption of As(V) by the goethite/silica nanocomposite was rapid: Equilibrium was reached within 120 min. Adsorption kinetics followed a pseudo-second-order kinetic model. The adsorption data were analyzed by both the Langmuir and Freundlich isotherm models. The maximum adsorption capacity of goethite/silica nanocomposite for As(V) from the Langmuir isotherm was 17.64 mg g -1 , which is larger than that of several other adsorbents. The nanocomposite adsorbent showed high efficiency in removing arsenic from aqueous solutions, even at low initial concentrations.

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Removal of As(V) and As(III) by reclaimed iron-oxide coated sands

Cited by 95 publications

References 26 publications

Adsorption of As(III) Ions onto Iron-Containing Waste Sludge

Adsorption of As(III) Ions onto Iron-Containing Waste Sludge

Removal of Arsenic and Coliform Bacteria by Modified Sand Filter With Slag and Zeolite from Drinking Water

Adsorption of arsenic(V) from aqueous solutions by goethite/silica nanocomposite

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