Biosorptive Removal of Zinc from  Aqueous Solution by Algerian  &amp;lt;i&amp;gt;Calotropis procera&amp;lt;/i&amp;gt; Roots

Meroufel, Bahia; Zenasni, Mohamed Amine; Merlin, André; George, B.

doi:10.4236/jep.2015.67067

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…pH of the solution is a major factor to decide the percentage removal of metal ions from the solution 2 . Batch experiments were carried at various pH values ranging 2-10.…”

Section: Resultsmentioning

confidence: 99%

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OPTIMIZATION OF ZINC(II) BIOSORPTION ONTOBoodleastruveiodes(MARINE ALGAE) BY CENTRAL COMPOSITE DESIGN

2017

RJC

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Heavy metal pollution is a major threat to the world as they can be toxic to all forms of life at high concentrations. They are released into the environment by a variety of industrial activities. The present study aims at removal of zinc from wastewater using low-costbiosorbentBoodlea struveiodes(marine algae). Batch experiments revealed that adsorption was influenced by various factors such as pH, initial metal ion concentration, the dosage of adsorbent, the size of the adsorbent and contact time. Langmuir, Freundlich and Tempkin adsorption isotherm models were used to test equilibrium data and they satisfactorily described the data. In order to analyze the effect of variables, the process parameters were set to optimum values pH 5, initial metal ion concentration 26.364 mg/l and dosage of adsorbent 3.0g were optimized with Response surface methodology through Central composite design. At optimum conditions, the maximum percentage of adsorption of Zinc by Boodlea struveiodeswas found to be 93.39.

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“…pH of the solution is a major factor to decide the percentage removal of metal ions from the solution 2 . Batch experiments were carried at various pH values ranging 2-10.…”

Section: Resultsmentioning

confidence: 99%

“…1000mg/l stock solution of Zinc was prepared by dissolving 8.80 g of ZnSO4.7H2O in pure distilled water and diluted to get standards of different concentration. 2,3 pH of the solution was adjusted to desired value by using 0.1N HCl and 0.1N NaOH and then measured with pH meter.…”

Section: Experimental Preparation Of Zinc Solutionmentioning

confidence: 99%

OPTIMIZATION OF ZINC(II) BIOSORPTION ONTOBoodleastruveiodes(MARINE ALGAE) BY CENTRAL COMPOSITE DESIGN

2017

RJC

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“…Heavy metals are the most commonly found inorganic pollutants, severely polluting water resources [1]. Even at low concentrations, these hazardous metal ions have caused damage to drinking water supplies and water resources, and they quickly accumulate in human beings through the food chain, leading to various kinds of disorders and diseases [2]. For subsequent and careful disposal of waste, heavy metals elimination from aqueous solution is a prerequisite.…”

Section: Introductionmentioning

confidence: 99%

Kaolinite-Composited Biochar and Hydrochar as Low-Cost Adsorbents for the Removal of Cadmium, Copper, Lead, and Zinc from Aqueous Solutions

Al-Swadi,

Al-Farraj,

Al-Wabel

et al. 2023

Sustainability

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During the last decade, due to an increase in anthropogenic activities, a higher environmental accumulation of heavy metals has been found, which has resulted in disturbed biogeochemical balance. Many kinds of remediation techniques have been practiced to mitigate heavy metal toxicity in the aqueous phase; however, adsorption is the most commonly accepted technique for efficient heavy metal removal. In this study, conocarpus waste was pretreated with 0%, 10%, and 20% kaolinite and pyrolyzed at 600 °C for 1 h to synthesize biochars (BC, BCK10, and BCK20, respectively), while hydrothermalized at 200 °C for 6 h to synthesize hydrochars (HC, HCK10, and HCK20, respectively). After characterization, synthesized materials were employed for the removal of cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) from contaminated water. Experimental data was further subjected to isotherm and kinetic models to estimate the adsorption mechanism. Among all the tested adsorbents, kaolinite-synthesized materials revealed comparatively higher adsorption compared to pristine materials. It was found that pH 7 was optimum for the maximum removal of tested heavy metals. Adsorption of tested heavy metals was well explained by Langmuir and Freundlich isotherms, while pseudo-second order and Elovich kinetics models fitted well for adsorption kinetics. The maximum adsorption capacity, as predicted by the Langmuir isotherm, was the highest for BCK20 (63.19 mg g−1 for Cd, 228.05 mg g−1 for Cu, 248.33 mg g−1 for Pb, and 45.79 mg g−1 for Zn) compared to the other tested materials, and for HCK20 (31.93 mg g−1 for Cd, 181.78 mg g−1 for Cu, 231.85 mg g−1 for Pb, and 45.72 mg g−1), it was higher than pristine HC. Isotherm and kinetics modeling data indicated that multiple mechanisms were involved in Cd, Cu, Pb, and Zn removal, such as chemisorption and electrostatic interactions. The amount of oxygen-containing surface functional groups and SiO2 particles could be responsible for the maximum adsorption of heavy metals by BCK20 and HCK20. Our findings suggest that biochar, hydrochar, and their kaolinite-modified composites possess the excellent potential to remove heavy metals from contaminated aqueous media, and could be further applied to treat wastewater to mitigate heavy metal toxicity for a sustainable environment.

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“…Water pollution caused by toxic heavy metal ions has become a serious environmental problem [1]. These toxic metal ions, even at low concentrations, have deteriorated water resources and drinking water and easily accumulated in the human body throughout the food chain, causing a variety of diseases and disorders [2]. So, it is necessary to remove these metal ions from industrial effluents for their subsequent safe disposal.…”

Section: Introductionmentioning

confidence: 99%

Valorisation and Modification of Saharan Clay for Removal of Cu(II), Ni(II), Co(II) and Cd(II) from Aqueous Solutions

Meroufel¹,

Zenasni²,

George³

2020

Pol. J. Environ. Stud.

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The organosilane-modified Saharan kaolin (KS) was prepared and tested as an adsorbent for Cu(II), Ni(II), Co(II) and Cd(II) removal from aqueous solution in comparison with original Saharan kaolin (K). Characterization of modified clay material and original clay was carried out by different methods (XRD, FTIR, TGA and SEM) in order to establish the link between synthesis, structures and properties. The hydrophilic properties of the clay surface have been modified, but not turned into hydrophobic ones. The graft has indeed a polar amine group and the chain length is too short to present an important hydrophobic character. The adsorption of heavy metal ions onto APTES-modified kaolin showed greater efficiency than original kaolin. The adsorption of metal ions by the original kaolin is dominated by the cation exchange phenomenon with a preferential order of selectivity: Cu(II)>Ni(II)>Co(II)>Cd(II), while adsorption on KS is mainly dominated by attraction of the chelating group of the amine in the same order of selectivity. This new hybrid organic-inorganic material may be a good alternative for separation and preconcentration of heavy metal ions.

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Biosorptive Removal of Zinc from Aqueous Solution by Algerian <i>Calotropis procera</i> Roots

Cited by 5 publications

References 25 publications

OPTIMIZATION OF ZINC(II) BIOSORPTION ONTOBoodleastruveiodes(MARINE ALGAE) BY CENTRAL COMPOSITE DESIGN

OPTIMIZATION OF ZINC(II) BIOSORPTION ONTOBoodleastruveiodes(MARINE ALGAE) BY CENTRAL COMPOSITE DESIGN

Kaolinite-Composited Biochar and Hydrochar as Low-Cost Adsorbents for the Removal of Cadmium, Copper, Lead, and Zinc from Aqueous Solutions

Valorisation and Modification of Saharan Clay for Removal of Cu(II), Ni(II), Co(II) and Cd(II) from Aqueous Solutions

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