Arsenic adsorption on Ti‐pillared montmorillonite

Na, Ping; Jia, Xiumin; Yuan, Bin; Li, Yuan; Na, Jiyu; Chen, Yu‐Chen; Wang, Linshuang

doi:10.1002/jctb.2360

Cited by 54 publications

(22 citation statements)

References 32 publications

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“…At boundary conditions from t = 0 to t and from q t = 0 to q e (Na et al, 2010), the rate law becomes: It can be observed that the pseudo-second-order model provides a better correlation to the kinetic data, with correlation coefficients of 0.99. A pseudo-second-order model for arsenic adsorption process has also been reported previously (Pena et al, 2005;Maity et al, 2005;Na et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

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Algerian natural montmorillonites for arsenic(III) removal in aqueous solution

Zehhaf

Benyoucef

Quijada

et al. 2013

Int. J. Environ. Sci. Technol.

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The adsorption of As(III) from aqueous solutions using naturally occurring and modified Algerian montmorillonites has been investigated as a function of contact time, pH and temperature. Kinetic studies reveal that uptake of As(III) ions is rapid within the first 3 hours and it slows down thereafter. Equilibrium studies show that As(III) shows the highest affinity towards Acidic-montmorillonite even at very low concentration of arsenic. The kinetics of As(III) adsorption on all montmorillonites used is well described by a pseudosecond-order chemical reaction model, which indicates that the adsorption process of these species is likely to be chemisorption. Adsorption isotherms of As(III) fitted the Langmuir and Freundlich isotherm models well. The adsorption of As(III) is pH-dependent obtaining an optimal adsorption at pH 5. From the thermodynamic parameters, it is concluded that the process is exothermic, spontaneous and favorable. The results suggest that M 1 , M 2 and Acidic-M 2 could be used as low cost and effective filtering materials for removal of arsenic from water.

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Section: Resultsmentioning

confidence: 99%

“…It seems that pH has little effect on the adsorption of As(III) under acidic conditions. This is probably because arsenic ions exist in the form of H 3 AsO 3 in the pH range 0-9 (Na et al, 2010), and therefore there is a lack of electrostatic interaction between As(III) and the adsorbent surface.…”

Section: Effect Of Ph On the Adsorption Of As(iii)mentioning

confidence: 99%

Algerian natural montmorillonites for arsenic(III) removal in aqueous solution

Zehhaf

Benyoucef

Quijada

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Adsorption of As onto clay can occur directly on edge surfaces and indirectly through cation bridging on basal surfaces [17], which has been shown to be highly dependent on pH [9,10,12,13]. As can form inner sphere complexes on (hydr)oxides [18,19,22], which are confirmed by density functional theory (DFT) calculations [20,22,23,27].…”

Section: Introductionmentioning

confidence: 81%

“…Numerous studies have been carried out to investigate As adsorption on various minerals, such as clay minerals [9][10][11][12][13][14][15][16][17] and (hydr)oxides [18][19][20][21][22][23][24][25][26][27]. Adsorption of As onto clay can occur directly on edge surfaces and indirectly through cation bridging on basal surfaces [17], which has been shown to be highly dependent on pH [9,10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Interlayer Structures and Dynamics of Arsenate and Arsenite Intercalated Layered Double Hydroxides: A First Principles Study

Zhang¹,

Liu²,

Zhang³

et al. 2017

Minerals

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Abstract:In this study, by using first principles simulation techniques, we explored the basal spacings, interlayer structures, and dynamics of arsenite and arsenate intercalated Layered double hydroxides (LDHs). Our results confirm that the basal spacings of NO 3 − -LDHs increase with layer charge densities. It is found that Arsenic (As) species can enter the gallery spaces of LDHs with a Mg/Al ratio of 2:1 but they cannot enter those with lower charge densities. Interlayer species show layering distributions. All anions form a single layer distribution while water molecules form a single layer distribution at low layer charge density and a double layer distribution at high layer charge densities. H 2 AsO 4 − has two orientations in the interlayer regions (i.e., one with its three folds axis normal to the layer sheets and another with its two folds axis normal to the layer sheets), and only the latter is observed for HAsO 4 2− . H 2 AsO 3 − orientates in a tilt-lying way. The mobility of water and NO 3 − increases with the layer charge densities while As species have very low mobility.Our simulations provide microscopic information of As intercalated LDHs, which can be used for further understanding of the structures of oxy-anion intercalated LDHs.

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“…Так у ряді робіт вказують на достатньо високі сорбційні властивості пілардованих глин щодо вида-лення арсенатів з водного середовища [7][8][9], ртуті [10].…”

Section: літературний оглядunclassified