Fabrication and characterization of iron oxide ceramic membranes for arsenic removal

Sabbatini, P.; Yrazu, Fernando Miguel; Rossi, Francesca; Thern, G.; Marajofsky, A.; Cortalezzi, María Marta Fidalgo de

doi:10.1016/j.watres.2010.05.059

Cited by 75 publications

(46 citation statements)

References 37 publications

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“…Because of their low cost and affinity to arsenic, various iron oxides, including amorphous hydrous ferric oxide (FeOOH), goethite (␣-FeOOH), and hematite (␣-Fe 2 O 3 ), have been extensively studied in various forms for the removal of arsenic from water [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Although the amorphous FeOOH and goethite have the high surface areas, which are deemed beneficial to the adsorption process, they are not stable and could easily decompose or form low surface-area crystalline iron oxides during the synthesis and usage, which will greatly reduce their As removal capacity [18].…”

Section: Introductionmentioning

confidence: 99%

“…Till now, most reports on the arsenic removal by ␣-Fe 2 O 3 are concentrated on using natural hematite [7,14,[20][21][22][23][24][25][26]. Reports are limited for the use of synthetic nano-sized ␣-Fe 2 O 3 to remove arsenic (most on As(V)) [27][28][29], and no systematic study had been made on the removal of As(III) from water with nano-sized ␣-Fe 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

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Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

Tang

Gao

et al. 2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

Tang

Gao

et al. 2011

Journal of Hazardous Materials

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“…It has been estimated that an approximate of 35-77 million people in Bangladesh are at the risk of drinking arsenic contaminated water (Ahmad et al 1997;Chowdhury et al 1999;Maji et al 2008;Argos et al 2010). Due to high health risks associated with the consumption of arsenic contaminated water and food products, the World Health Organization (WHO), European Union, and the US Environmental Protection Agency (US EPA) have set the arsenic standard for drinking water as 10 lg/L (10 ppb) to protect consumers from the long time chronic exposure to arsenic (Sabbatini et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Ceria modified activated carbon: an efficient arsenic removal adsorbent for drinking water purification

et al. 2016

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Ceria (CeO 2 ) coated powdered activated carbon was synthesized by a single step chemical process and demonstrated to be a highly efficient adsorbent for the removal of both As(III) and As(V) from water without any pre-oxidation process. The formation of CeO 2 on the surface of powdered activated carbon was confirmed by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The percentage of Ce in the adsorbent was confirmed to be 3.5 % by ICP-OES. The maximum removal capacity for As(III) and As(V) was found to be 10.3 and 12.2 mg/g, respectively. These values are comparable to most of the commercially available adsorbents. 80 % of the removal process was completed within 15 min of contact time in a batch process. More than 95 % removal of both As(III) and As(V) was achieved within an hour. The efficiency of removal was not affected by change in pH (5-9), salinity, hardness, organic (1-4 ppm of humic acid) and inorganic anions (sulphate, nitrate, chloride, bicarbonate and fluoride) excluding phosphate. Presence of 100 ppm phosphate reduced the removal significantly from 90 to 18 %. The equilibrium adsorption pattern of both As(III) and As(V) fitted well with the Freundlich model with R 2 values 0.99 and 0.97, respectively. The material shows reusability greater than three times in a batch process (arsenic concentration reduced below 10 ppb from 330 ppb) and a life of at least 100 L in a column study with 80 g material when tested under natural hard water (TDS 1000 ppm, pH 7.8, hardness 600 ppm as CaCO 3 ) spiked with 330 ppb of arsenic.

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“…Several technologies reported to remove arsenic from water include coagulation-flocculation, ion exchange, membrane technologies, reverse osmosis and adsorption processes [10]. Adsorption is more advantageous over other As removal technologies in terms of simplicity, economy, removal efficiency, easiness in operation and maintenance, flexibility to be scaled up (from the point of use to a municipal water treatment plant), and avoidance of liquid waste generation on site [6], [11], [12]. Low cost materials have gained increasing interest to be used as adsorbents for As removal from water to reduce the operational costs.…”

Section: Introductionmentioning

confidence: 99%

Modification of Natural Common Clays as Low Cost Adsorbents for Arsenate Adsorption

Te¹,

Wichitsathian²,

Yossapol³

2015

IJESD

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Abstract-In this study, natural common clays were used as raw materials to be modified with ferric and ferrous solutions to develop improved efficient and low cost adsorbents. The adsorbents (Raw Clay, Clay/FeSO 4 , and Clay/FeCl 3 ) were investigated for arsenate removal from synthetic aqueous solution in batch studies with respect to contact time, solution pH, initial As(V) concentration, and temperature. The results showed that As(V) uptake was pH dependent and the high efficiency occurred in the acidic condition. The adsorption kinetic data were fitted well with the pseudo second order adsorption model. The estimated maximum adsorption capacity from Langmuir model was 0.44, 1.50, and 0.86 mg/g for Raw Clay, Clay/FeSO 4 , and Clay/FeCl 3 , respectively. The values of a dimensionless constant separation factor (R L ) and the magnitude of the adsorption intensity (1/n) showed that As(V) was adsorbed favorably on all adsorbents. The thermodynamic parameters indicated that the adsorption is spontaneous and endothermic and an irregular increase of the randomness at the adsorbent-adsorbate interface during the adsorption.

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Fabrication and characterization of iron oxide ceramic membranes for arsenic removal

Cited by 75 publications

References 37 publications

Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

Ceria modified activated carbon: an efficient arsenic removal adsorbent for drinking water purification

Modification of Natural Common Clays as Low Cost Adsorbents for Arsenate Adsorption

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