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Journal ArticleDOI

Cadmium Removal from Aqueous Solution by a Tunisian Smectitic Natural and Activated Clay: Thermodynamic Study

30 Dec 2011-Vol. 1, Iss: 4, pp 65-71
TL;DR: In this paper, the capacity of fixing of cadmium present in aqueous solution, by two types of clay: natural and activated, was investigated using batch experiments and the experimental data obtained were evaluated and fitted using adsorbent equilibrium isotherms.
Abstract: The removal of heavy metals from industrial waste streams has become one of the most important applications in wastewater treatment in terms of protecting public health and environment. The recovery of metals present in the industrial effluents by adsorption onto natural materials constitutes a technological option increasingly studied throughout the world. However, the implementation of such process on an industrial scale requires the use of adsorbents easily available and inexpensive. Clay in these two forms natural and activated answers very well to these two requirements. The present research aimed the study of the capacity of fixing of cadmium present in aqueous solution, by two types of clay: natural and activated. The adsorption capacity of adsorbent was investigated using batch experiments. The influence of pH, temperature and adsorbent dose were investigated and the experimental data obtained were evaluated and fitted using adsorbent equilibrium isotherms. Adsorption isotherms of cadmium onto natural and activated clay were determined and correlated with common isotherm equations such as the Langmuir and Freundlich models. The Langmuir model agrees very well with experimental data. The thermodynamic parameters obtained indicated that the adsorption of cadmium ions onto natural clay was a spontaneous and an endothermic process.

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Citations
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Journal ArticleDOI
14 Aug 2019-Minerals
TL;DR: A survey of the literature shows that water treatment residuals may be a suitable material for developing an efficient adsorbent for the removal of heavy metals and metalloids from water as discussed by the authors.
Abstract: Heavy metal contamination is one of the most important environmental issues. Therefore, appropriate steps need to be taken to reduce heavy metals and metalloids in water to acceptable levels. Several treatment methods have been developed recently to adsorb these pollutants. This paper reviews the ability of residuals generated as a by-product from the water treatment plants to adsorb heavy metals and metalloids from water. Water treatment residuals have great sorption capacities due to their large specific surface area and chemical composition. Sorption capacity is also affected by sorption conditions. A survey of the literature shows that water treatment residuals may be a suitable material for developing an efficient adsorbent for the removal of heavy metals and metalloids from water.

100 citations


Cites background from "Cadmium Removal from Aqueous Soluti..."

  • ...It might be explained by the fact that metal ions form complexes with acidic functional groups in the sorbent [92]....

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Journal ArticleDOI
TL;DR: A low cost adsorbent based on sludge of drinking water treatment plant (DWTP), solid waste byproduct of sedimentation process in the DWTP, was studied for adsorption of cadmium ion in water as discussed by the authors.

78 citations

Journal ArticleDOI
TL;DR: In this paper, photo-fenton processes were used as handy tools to ascertain the capability of natural clays to remove cadmium (Cd) and 2-chlorophenol (2-CP) from aqueous solution.

47 citations

Journal ArticleDOI
TL;DR: In this paper, a representative clay sample was collected from the outcropping feature of the Aidoudi area to the west of Gabes city; it followed a simple treatment to enhance its physicochemical properties.
Abstract: The present study has been carried out for potential use of a raw clay from Gabes district (southern Tunisia) in wastewater treatment. A representative clay sample was collected from the outcropping feature of the Aidoudi area to the west of Gabes city; it followed a simple treatment to enhance its physicochemical properties. Adsorption experiments were performed by using a simple batch technique in single- and multi-element solution (Pb2+, Cd2+, Cu2+ and Zn2+). The obtained results were fitted to different adsorption models, including extended and modified Langmuir, extended Freundlich and modified Redlich–Peterson. Our results indicated that the collected clay sample is mainly a smectite with high amounts of silica, alumina and iron. Adsorptive removal of single elements revealed encouraging efficiencies for most of the studied metals, reaching nearly 100%. Our results also indicated that lead removal reached 26.78 mg/g and 45.94 mg/g for natural and activated clay samples, respectively. Competitive adsorption showed strong dependence on the initial concentration and the metal properties, with preferential removal of lead that reached 41.71 mg/g in binary systems. In most of the mixed systems, metal removal substantially decreased in the presence of competing ions. It showed preferential removal of lead over other metals, regardless of the studied mixture. Further, the use of smectitic clay from southern Tunisia showed a good potential for metal ions removal in single and multi-element systems from aqueous solutions. Thus, it could be turned out to a viable material for the treatment of metal loaded waters.

10 citations

Journal ArticleDOI
TL;DR: The bio-adsorbent developed based on leaf of platanus sp.

10 citations

References
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Journal ArticleDOI
TL;DR: The technical feasibility of various low-cost adsorbents for heavy metal removal from contaminated water has been reviewed and it is evident from the literature survey of about 100 papers that low- cost adsorbent have demonstrated outstanding removal capabilities for certain metal ions as compared to activated carbon.

3,072 citations


Additional excerpts

  • ...The treatments methods, such as chemical precipitation, reverse osmosis, ion exchange and adsorption have been practiced for the removal of heavy metals [2], but these methods are not economical and do not exhibit high treatment efficiency....

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Journal ArticleDOI
TL;DR: A comparison of the results of the present investigation with those reported in the literature showed that chitosan coated on alumina exhibits greater adsorption capacity for chromium(VI), while the ultimate capacity obtained from the Langmuir model is 153.85 mg/g chitan.
Abstract: A new composite chitosan biosorbent was prepared by coating chitosan, a glucosamine biopolymer, onto ceramic alumina. The composite bioadsorbent was characterized by high-temperature pyrolysis, porosimetry, scanning electron microscopy, and X-ray photoelectron spectroscopy. Batch isothermal equilibrium and continuous column adsorption experiments were conducted at 25 degrees C to evaluate the biosorbent for the removal of hexavalent chromium from synthetic as well as field samples obtained from chrome plating facilities. The effect of pH, sulfate, and chloride ion on adsorption was also investigated. The biosorbent loaded with Cr(VI) was regenerated using 0.1 M sodium hydroxide solution. A comparison of the results of the present investigation with those reported in the literature showed that chitosan coated on alumina exhibits greater adsorption capacity for chromium(VI). Further, experimental equilibrium data were fitted to Langmuir and Freundlich adsorption isotherms, and values of the parameters of the isotherms are reported. The ultimate capacity obtained from the Langmuir model is 153.85 mg/g chitosan.

484 citations

Journal ArticleDOI
TL;DR: In this article, activated carbon prepared from coirpith, an agricultural solid waste byproduct, has been used for the adsorption of Cd(II) from aqueous solution.

447 citations


"Cadmium Removal from Aqueous Soluti..." refers background in this paper

  • ...Cadmium is one of the most toxic contaminants found in the environment and is released into the aqueous system from metal plating, smelting, mining cadmium-nickel batteries, phosphate fertilizers, paint industries, pigments, and alloy industries as well as from sewage [3]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the ability of crab shell to remove heavy metals from aqueous solution was evaluated by comparing with that of several sorbents (cation exchange resin, zeolite, granular activated carbon, powdered activated carbon).

352 citations

Journal ArticleDOI
TL;DR: In this paper, a method for the rapid determination of CEC values in clays using au ethylenediamine complex of Cu was tested with different clays and the results were generally in good agreement with those given by the classical Kjeldahl method.

319 citations