Evaluating the adsorptive capacity of montmorillonitic and calcareous clays on the removal of several heavy metals in aqueous systems

Sdiri, Ali; Higashi, Teruo; Hatta, Toshihisa; Jamoussi, Fakher; Tase, Norio

doi:10.1016/j.cej.2011.05.015

Cited by 138 publications

(79 citation statements)

References 34 publications

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“…Those studies were limited to the adsorption of single metals, despite the fact that contaminated wastewaters contain more than one pollutants [e.g., Pb(II), Cd(II), Cu(II), and Zn(II)] that have to be removed before the final discharge in the receiving ecosystems. The Coniacian-Lower Campanian clays of the Aleg formation, Tunisia, showed high adsorptive capacities for heavy metal (Sdiri et al 2011(Sdiri et al , 2012b. While most sorption studies that are conducted on clays usually start by the removal of non-clay minerals (e.g., carbonate minerals, and quartz) in order to concentrate the clay minerals and improve the sorption properties of the adsorbent (Al-Degs et al 2006), the effects of carbonates impurities have not been studied in details.…”

Section: Introductionmentioning

confidence: 99%

“…The use of natural clays in the removal of Cu(II) and Zn(II) from aqueous solutions is of particular interest for environmental cleanup since the use of natural adsorbents is particularly beneficial for the development of cost-effective process for heavy metal removal from wastewaters. Adsorption is the most preferred method for removal of heavy metals from aqueous solutions due to its simplicity and its high A. T. Sdiri (&) Á T. Higashi Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan e-mail: alisdiri@yahoo.fr effectiveness (Sdiri et al 2011(Sdiri et al , 2012a. In this regards, multiple researchers studied the effectiveness of various type of clay in removing heavy metals from aqueous solutions including kaolinite (Sari et al 2007;Schaller et al 2009), bentonite (Ulmanu et al 2003;Kaya and Hakan Ö ren 2005;Eren et al 2009), illite (Ozdes et al 2011), sepiolite (Guerra et al 2010), montmorillonite (Lin and Juang 2002), and other adsorbents (Al-Degs et al 2006;Engates and Shipley 2011).…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of copper and zinc onto natural clay in single and binary systems

Sdiri

Higashi

Jamoussi³

2013

Int. J. Environ. Sci. Technol.

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Calcareous and smectitic clay samples from the Coniacian-Lower Campanian system, Tunisia, were used as adsorbents for the removal of copper and zinc from aqueous solutions in single and binary systems. Calcareous clay sample was treated with acetic acid to obtain carbonate-free sample that was also used for metals removal. The adsorption of metal ions onto natural clay was tested in a batch method by mixing 1 g/L of each sample with a metal ion solution of zinc (300 lmol/L) and/or copper 600 lmol/L under the operating pH of 6, and agitation speed of 200 rpm within the equilibrium time of 60 min at 25°C for single and binary systems. Our results showed that natural clay samples were mainly composed of silica, alumina, iron, and magnesium oxides. Adsorption data showed that the studied clay samples removed substantial amounts of heavy metals in single and mixed systems. Initial solution pH and carbonates contents enhanced the removal capacities of the studied clay samples, confirming their strong influencing effects. Thermodynamic parameters indicated an endothermic adsorption for metals removal by calcareous clay, but exothermic process for the smectitic sample. These results suggest that the Late Cretaceous clays, Tunisia, can be effectively used as natural adsorbents for the removal of toxic heavy metals in aqueous systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of copper and zinc onto natural clay in single and binary systems

Sdiri

Higashi

Jamoussi³

2013

Int. J. Environ. Sci. Technol.

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“…The separation factor was computed by R L = 1/(1 + K L C o ), where C o (mg/L) is the initial As(V) concentration. [15]. The values of R L computed for As(V) adsorption on Raw Clay, Clay/FeSO 4 , and Clay/FeCl 3 were 0.05-0.72, 0.04-0.66, and 0.06-0.77, respectively.…”

Section: Kinetic Studiesmentioning

confidence: 99%

“…Clays are good adsorbents because of their large specific surface area, chemical and mechanical stability, layered structure, and high cation exchange capacity [14], [15]. However, raw clays express low adsorption of some anionic pollutants due to the negative charges on the surface [16].…”

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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“…The physical and chemical treatment has been used in metal effluent removal. The adsorption method with different types of adsorbent has been used to treat these metals from waste water [8][9][10][11] . Iron and manganese are the most common elements in the groundwater supplies (Sequestering methods of iron and manganese treatment).…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid Activation on Adsorption of Iron and Manganese Using Libyan Bentonite Clay

2017

Chem Sci Trans

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Abstract:The pollution by heavy metals currently is becoming a big challenge and a concern for the water quality and also for the environment in general. Some metal ions are toxic even if their concentration is very low and their toxicity increases with accumulation in water and soils. Several industrial wastewater streams may contain heavy metals such as, Pb, Cr, Cd, Ni, Fe, Mn as well as Zn, As, Hg, Cu and Ag. The clays have been extensively utilized for the removal of heavy metals from aqueous solutions. The aim of this research work was to prepare acid activated bentonite clay by using H 2 SO 4 and C 2 H 4 O 2 as acid chemical reagents. The adsorption capacity of natural and acid activated bentonite clay with iron and manganese was also investigated. The removal of two heavy metals was studied at 25 °C. Both modified forms showed higher adsorption efficiency than the natural clay. Moreover, the empirical values were evaluated according to the Freundlich isotherms that are generally used to describe the adsorption processes. The heavy metal-clay adsorption phenomena can be illustrated on the basis of the interaction between surface functional group of silicates (clay) and the metal ions. It is deduced that clay can be used as a low cost adsorbent and locally available for the removal of heavy metals, especially in the developing countries.

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Evaluating the adsorptive capacity of montmorillonitic and calcareous clays on the removal of several heavy metals in aqueous systems

Cited by 138 publications

References 34 publications

Adsorption of copper and zinc onto natural clay in single and binary systems

Adsorption of copper and zinc onto natural clay in single and binary systems

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

Effect of Acid Activation on Adsorption of Iron and Manganese Using Libyan Bentonite Clay

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