Physicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediation

Stathi, Panagiota; Litina, Kiriaki; Gournis, Dimitrios; Giannopoulos, Thomas; Deligiannakis, Yiannis

doi:10.1016/j.jcis.2007.07.078

Cited by 123 publications

(94 citation statements)

References 31 publications

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“…Clays and minerals such as montmorillonite, vermiculite, illite, kaolinite and bentonite are known as alternative materials used to adsorption of heavy metal due to several economic advantages [1][2][3][4][5][6][7][8][9] and their intrinsic properties, such as large specific surface area, excellent physical and chemical stability and properties structural and surface 10 . Other low-cost adsorbents have been investigated, mainly using bioadsorbents, such as algae 11 and chitosan 12 .…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

2011

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“…Recently, the use of clay for sorptionor elimination of heavy metals in effluents has been conisderd as an object of study in a great deal of research due to its several economic advantages [2][3][4]. The cost of these adsorbents is relatively low when it's compared to other alternative adsorbents, including activated coal, natural and synthetic zeolites, ionexchange resins and other adsorbent materials.…”

Section: Introductionmentioning

confidence: 99%

“…The acceptable limit of Ni in drinking water is 0.01 mg 4 ] has been estimated as lethal in humans at atmospheric exposures of 30 ppm for 30 min [8]. Acute poisoning of Ni(II) causes headache, dizziness, nausea and vomiting, chest pain, tightness of the chest, dry cough and shortness of breath, rapid respiration, cyanosis and extreme weakness.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Toxic Ni (II) from an Aqueous Solution by Bentonite

Sallam¹

2017

IJEE

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Abstract:In this study, the adsorption potential of bentonite for removal of Ni(II) ions from wastewater has been investigated. The study involves batch type experiments to investigate the effect of initial concentration, adsorbent dose, agitation speed, contact time, temperature and pH of the solution on adsorption process and the optimum conditions were evaluated. The adsorption process fits pseudo-second order kinetic models. Langmuir and Freundich adsorption isotherm models were applied to analyze adsorption data and both were found to be applicable to the adsorption process. Thermodynamic parameters, e.g., ∆G o , ∆S o and ∆H o of the on-going adsorption process have also been calculated and the sorption process was found to be endothermic. Finally, it can be seen that Bentonite was found to be more effective for the removal of Ni(II) at the same experimental conditions.

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“…Similarly, there is a growing research interest in the use of some micro-porous materials such as zeolites in heavy metal remediation [24][25][26][27][28]. The study reported here compares chemical precipitation or adsorption of lead from contaminated aqueous solution by commercial chemicals (chlorides, carbonates, and sulfates of sodium and calcium) and biomaterials (Charred grapes and spinach, fishbone) and molecular sieves.…”

Section: Introductionmentioning

confidence: 99%

Biosorption and Chemical Precipitation of Lead Using Biomaterials, Molecular Sieves, and Chlorides, Carbonates, and Sulfates of Na & Ca

Agwaramgbo¹,

Nancy²,

Nunez³

et al. 2013

JEP

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Lead, a heavy metal, is a well known contaminant in water and has been reported to cause serious health implications to humans, animals, and plants. One of the processes for heavy metal remediation of contaminated water is chemical precipitation. In this present work, chemical precipitation of lead from a contaminated aqueous matrix by chlorides, carbonates, and sulfates of sodium and calcium was compared to lead removal by molecular sieves and biomaterials (fishbone, grape and spinach). The order of lead removal from 1400 ppm of lead solution is sodium chloride (31%) < calcium chloride (62%) < burnt grape (83%) < charred spinach (92.3%) < sodium phosphate (95.8%) < sodium carbonate (97%) < molecular sieve sphere (98.7%) < sodium sulfate (99.3%) < calcium sulfate (99.7%) < molecular sieves ground (99.71%) < fishbone (99.87%) < calcium carbonate (99.9%).

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Physicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediation

Cited by 123 publications

References 31 publications

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

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

Adsorption of Toxic Ni (II) from an Aqueous Solution by Bentonite

Biosorption and Chemical Precipitation of Lead Using Biomaterials, Molecular Sieves, and Chlorides, Carbonates, and Sulfates of Na & Ca

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Physicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediation

Cited by 123 publications

References 31 publications

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

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

Adsorption of Toxic Ni (II) from an Aqueous Solution by Bentonite

Biosorption and Chemical Precipitation of Lead Using Biomaterials, Molecular Sieves, and Chlorides, Carbonates, and Sulfates of Na &amp; Ca

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Biosorption and Chemical Precipitation of Lead Using Biomaterials, Molecular Sieves, and Chlorides, Carbonates, and Sulfates of Na & Ca