Heavy metal removal from water by sorption using surfactant-modified montmorillonite

Lin, Su‐Hsia; Juang, Ruey‐Shin

doi:10.1016/s0304-3894(02)00026-2

Cited by 546 publications

(202 citation statements)

References 16 publications

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“…the finding of this study can serve as a base for preparing a low cost adsorbent with relatively similar advantages of the plain bentonite in addition to an improved physical properties that can expand the bentonite applicability for metals removal . The results obtained in this study is in agreement with the findings of many studies that have reported the ability of bentonite to remove heavy metals (Álvarez-Ayuso and Garćia-Śanchez, 2003;Bereket et al, 1997;Fu & Wang, 2011;Lin and Juang, 2002). Talaat et al, (2011), evaluated the use of different type of Egyptian clay in the form of kaolin, calcium bentonite and sodium bentonite for the removal of 5 metals as Ni, Cd, Cu, Zn, and Pb.…”

Section: Resultssupporting

confidence: 90%

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

2016

Global NEST Journal

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Adsorption is one of the methods that can be used for metal removal. In this study five metals were used cadmium, chromium, lead, copper and nickel (Cd, Cr, Pb, Cu, and Ni) over a concentration range from 0.8 to about 7 mg l -1 for each metal. Adsorbents were prepared with increasing chitosan to bentonite ratio from 0 to 0.67 g chitosan/g bentonite. The study showed that adsorption of metals on plain bentonite and chitosan modified bentonite can fit well with Langmuir and Freundlich adsorption isotherms. Furthermore, the bentonite adsorption capacity will decrease with the increase of chitosan/bentonite ratio. This study concluded that bentonite is a good adsorbent. However, the applicability of bentonite as potential adsorbent may be limited by its physical properties such as slow settling rate and difficulty to use it as an adsorbent in adsorption columns. Despite the decrease of maximum theoretical adsorption capacity as a result of chitosan modification, the addition of small amount of chitosan can improve the physical characteristics of bentonite clay to be used as an adsorbent.

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Section: Resultssupporting

confidence: 90%

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

2016

Global NEST Journal

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“…The clays-Cu interactions occurred spontaneously and were accompanied by a decrease in Gibbs free energy (ΔG < 0). The degree of spontaneity was found to decline as the process temperature rose, ranging from −16.6 to −27.9 kJ.mol -1 for the temperature range between 273 and 348 K. Adsorption and ion exchange of Cu(II) on different clays had already been reported as endothermic [23][24][25][26][27][28] , as shown in Table 6. It was likely that adsorption of Cu(II) ions on clay surface require an activation energy and rise in temperature helped more Cu(II) ions to overcome this energy barrier and get attached to the surface 23 .…”

Section: Adsorption Thermodynamicsmentioning

confidence: 90%

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

2011

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Cu (II) removal equilibrium from aqueous solutions using calcined clays "Bofe" and "Verde-lodo" has been studied by batch and fixed-bed in static and dynamic systems, respectively. Analyses were performed for physicochemical characterization of clays using the techniques: X-ray fluorescence (XRF), thermogravimetry (TG), N 2 adsorption (BET) and Cationic Exchange Capacity (CEC). Batch experiments were performed at a constant temperature, adjusting the pH of the solution in contact with clays. Adsorption assays in fixed bed were conducted at the flow rate determined through mass transfer zone (MTZ). Langmuir and Freundlich models were adjusted to equilibrium data. The results of characterization indicated that the temperature of 500 °C is best suited for the calcination of the clays. The maximum adsorption capacity was higher for dynamic system than fixed bed compared to static system, enhancing from 0.0748 to 0.1371 and from 0.0599 to 0.22 mmol.g -1 of clay for "Bofe" and "Verde-lodo", respectively.

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“…Parameters K T and b can be estimated by drawing the variation of q e as a function of lnC e . The D-R isotherm does not assume homogeneous or constant adsorption potential for the surface (Lin and Juang 2002). The equation describing D-R is given by Eq.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption efficiency, thermodynamics and kinetics of Schiff base-modified nanoparticles for removal of heavy metals

Moftakhar

Yaftian

Ghorbanloo

2016

Int. J. Environ. Sci. Technol.

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Nanosilica particles modified by Schiff base ligands 3-methoxy salicylaldimine propyl triethoxysilane (MNS 1 ), 5-bromo salicylaldimine propyl triethoxysilane (MNS 2 ) and 3-hydroxy salicylaldimine propyl triethoxysilane (MNS 3 ) were prepared, and their potential for separation of copper, lead, zinc, cadmium, cobalt and nickel ions from aqueous solutions was examined. The effect of parameters influencing adsorption efficiency including aqueous-phase pH, amount of adsorbent, stirring time and initial concentration of the metal ions was assessed and discussed. Although MNS 1 and MNS 3 removed lead ions efficiently, all adsorbents showed strong selectivity toward copper ions. It was shown that, under some circumstances, MNS 3 decreased the amount of other ions, particularly cobalt, in the aqueous phase. The adsorbents were also applied for removal of copper and lead ions from real samples. Possible quantitative desorption of the metal ions loaded onto the adsorbents suggests their multiple uses in adsorption-desorption process. Investigation of temperature dependency of the process led to determination of the DH°, DS°and DG°values. This investigation indicates that the adsorption of copper ions onto the all studied adsorbents and lead ions onto MNS 1 and MNS 3 is endothermic. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were tested to describe the equilibrium data. Pseudo-first-order, pseudo-secondorder, Elovich and intra-particle diffusion equations were applied to study the kinetics of copper and lead adsorption onto the modified nanoparticles. This investigation indicates that the process for all adsorbents follows pseudosecond-order kinetics and suggests a chemisorption mechanism for the adsorption processes by the studied adsorbents.

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Heavy metal removal from water by sorption using surfactant-modified montmorillonite

Cited by 546 publications

References 16 publications

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

Adsorption efficiency, thermodynamics and kinetics of Schiff base-modified nanoparticles for removal of heavy metals

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