Arsenic Adsorption onto Pillared Clays and Iron Oxides

Lenoble, Véronique; Bouras, Omar; Deluchat, Véronique; Serpaud, Bernard; Bollinger, Jean‐Claude

doi:10.1006/jcis.2002.8646

Cited by 301 publications

(169 citation statements)

References 33 publications

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“…3. As shown in it, pH influenced arsenite and arsenate adsorption differently, which has also been observed in other experiments (Lenoble et al 2002;Hristovski et al 2009). The effect of pH on As (III) removal was insignificant at pH fin values ranging from 2 to 9, with maximum removal being observed at pH fin 4-5 (pH ini 7-8).…”

Section: Effect Of Phsupporting

confidence: 84%

“…Thus, the decrease in As(III) uptake above pH 9 was due to electrostatic repulsion between the adsorbent and negatively charged arsenite species. Similar results were also obtained from arsenite adsorption by carbon-based adsorbents (Pattanayak et al 2000), iron oxides (Lenoble et al 2002), and iron-impregnated materials (Kundu and Gupta 2007).…”

Section: Effect Of Phsupporting

confidence: 75%

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Arsenic Removal from Water by Iron-Modified Bamboo Charcoal

Liu

Xiong

et al. 2011

Water Air Soil Pollut

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The effectiveness of a novel and low-cost adsorbent, iron-modified bamboo charcoal (BC-Fe), for arsenic removal from aqueous systems was evaluated in this study. The BC-Fe was synthesized by loading iron onto bamboo charcoal via soaking in a ferric salt solution. The BC-Fe possessed a porous structure with a surface area of 277.895 m 2 /g. The adsorption characteristics of arsenic onto BC-Fe were further investigated at various pHs, contact times, arsenic concentrations, and adsorbent doses in batch tests. The corresponding optimum equilibrium pH ranges for As(III) and As(V) removal were 4-5 and 3-4, respectively. The equilibrium times for As(III) and As(V) adsorption were 30 and 35.5 h, respectively. The arsenic removal was strongly dependent on the initial adsorbate concentration and adsorbent dosage. The maximum arsenic removal capacities of BC-Fe under the experimental conditions were 7.237 and 19.771 mg/g for As(III) and As(V), respectively.The pseudo-second-order kinetic model and Freundlich isotherm explained the kinetic and equilibrium of both the As(III) and As(V) adsorbent processes, respectively. Based on these results, the BC-Fe developed in this study is a promising material for the treatment of arsenic-contaminated water.

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Section: Effect Of Phsupporting

confidence: 84%

Section: Effect Of Phsupporting

confidence: 75%

Arsenic Removal from Water by Iron-Modified Bamboo Charcoal

Liu

Xiong

et al. 2011

Water Air Soil Pollut

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“…Arsenic is challenging to treat, and some of the common remediation methods may include containment using barriers, soil washing/flushing, electrokinetics, solidification and stabilization [5]. Solidification and stabilization (S/S) is considered to be the cost effective method for treating high levels of arsenic in soils [6]. Additives and binders used in S/S oxidize As +3 andAs +5 and form insoluble complexes or become immobilized due to formation of strongly adsorbed species or form co-precipitates with calcium or iron [7].…”

Section: Introductionmentioning

confidence: 99%

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Moghal

Reddy²,

Mohammed³

et al. 2017

geomate

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ABSTRACT:In this study, locally available semi-arid soils (Al-Ghat and Al-Qatif) having different chemical and mineralogical characteristics are considered as barrier materials, and their response to arsenic adsorption at varying initial concentrations, pH conditions, temperature and dilution ratios is studied. Empirical models (Langmuir and Freundlich) are applied to ascertain monolayer or heterogeneous adsorption. Lime is added to these soils in order to enhance their geotechnical properties. Kinetic models are employed to validate the type and nature of arsenic sorption onto these soils (whether pseudo first-order or second-order). Also Elovich and intraparticle diffusion models revealed that along with surface adsorption, chemisorptions and diffusion are the other processes occurring concurrently in the system, but it was not able to identify the dominant phenomenon among these models. It was concluded that both Al-Ghat and Al-Qatif soils when amended with lime can attenuate arsenic, and the experimental results correlate well with selected empirical models.

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“…Because of their large specific surface area, high pore volume, micro-/mesoporosity, and strong surface acidity, PILCs have significant applications in diverse areas [5][6][7][8][9]. For example, they can be used as efficient adsorbents for oxyanionic contaminants [10][11][12] and heavy metals [13,14], and as attractive cracking catalysts for heavy petroleum [1,15,16]. However, PILCs do not efficiently remove the hydrophobic organic compounds from water because of the hydrophilic surface.…”

Section: Introductionmentioning

confidence: 99%

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

Zhou

Tian

et al. 2013

J Therm Anal Calorim

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For combining the properties of organoclays and pillared clays, inorganic-organic clays have attracted much attention in recent years. In this study, Al Keggin cation pillared montmorillonites (Al-Mts) were first prepared and parts of Al-Mts were calcined at different temperatures (C-Al-Mts). The inorganic-organic montmorillonites were synthesized by intercalating Al-Mts and C-Al-Mts with the cationic surfactant, hexadecyltrimethyl ammonium bromide (HDTMAB). The products were characterized by X-ray diffraction, X-ray fluorescence, and simultaneous thermogravimetric analysis. For HDTMAB-modified uncalcined Al Keggin cation pillared montmorillonites (H-Al-Mts), the basal spacing increased with the increment of surfactant loading level, but the Al content of H-Al-Mts decreased simultaneously, indicating that the intercalated surfactant replaced some Al Keggin cations in the interlayer space. However, in the case of C-Al-Mts, the interlayer spaces could not be further expanded after surfactant modification, implying that the neighboring montmorillonite layers were ''locked'' by the aluminum pillars which were formed by dehydroxylation of Al Keggin cation pillars during thermal treatment. The thermal stability of HDTMAB-modified C-Al-Mts (H-C-Al-Mts) was much better than that of H-AlMts. The major mass loss of H-C-Al-Mts occurred at ca. 410°C, corresponding to decomposition of intercalated surfactant cations. In contrast, H-Al-Mts displayed two mass loss temperatures at ca. 270 and 410°C, corresponding to the evaporation of surfactant molecules and the decomposition of surfactant cations in the interlayer space, respectively.

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Arsenic Adsorption onto Pillared Clays and Iron Oxides

Cited by 301 publications

References 33 publications

Arsenic Removal from Water by Iron-Modified Bamboo Charcoal

Arsenic Removal from Water by Iron-Modified Bamboo Charcoal

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

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