Removal of a cationic dye from aqueous solutions by adsorption onto bentonite clay

Tahir, S.S.; Ullah, Shafqat

doi:10.1016/j.chemosphere.2005.10.033

Cited by 608 publications

(243 citation statements)

References 29 publications

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“…13 and Table 2. In addition, the values of 1/n or n (less than 1 or in the range of 2-10) determined with the Freundlich isotherm model describe favourable adsorption of As(V) on both DPF and the hybrid adsorbent [58][59]. The relatively higher R 2 value of the Langmuir model compared to the Freundlich model represents better adsorption of As(V) on OP, which also confirms that a fixed number of adsorption sites were available on this adsorbent.…”

Section: Equilibrium Isotherms and Kineticssupporting

confidence: 48%

Absorption Behaviours of Copper, Lead, and Arsenic in Aqueous Solution Using Date Palm Fibres and Orange Peel: Kinetics and Thermodynamics

Amin¹,

Alazba²,

Amin³

2017

Pol. J. Environ. Stud.

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In this study, date palm fibres and orange peel in both individual and hybrid forms were studied for the removal of copper, lead, and arsenic. Equilibrium was achieved after 150 minutes, and the highest and the lowest removal efficiencies were for Cu +2 and As(V), respectively. A slightly higher removal efficiency of metal ions using orange peel was observed, which could be due to the greater number of functional groups on the chemically pre-treated adsorbent. The highest removal was observed at pH 6, and the adsorption data exhibited a linear increase in metal removal capacity with increasing adsorbent concentrations from 0.1 to 2 g/L. A significantly higher removal efficiency was observed for a 45 µm particle size compared to larger particle sizes. Additionally, a 30-40% decrease in removal efficiencies was observed for all three heavy metal ions when using the date palm fibres or the hybrid adsorbent when the initial metal concentrations were increased from 20 to 80 mg/L. The Freundlich model agreed with the experimental data slightly better than the Langmuir model for both date palm fibres and the hybrid adsorbent. A pseudo second-order kinetic model better described the kinetic behaviour of As(V) adsorption on the investigated adsorbents. Date palm fibres exhibited exothermic adsorption, while both orange peel and the hybrid adsorbent displayed exothermic and endothermic reactions. Increased randomness at the solid-liquid interface was observed for all adsorbents, and the Gibbs free energy change values were negative, confirming the spontaneous nature of adsorption, which proceeded in the forward direction.

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Section: Equilibrium Isotherms and Kineticssupporting

confidence: 48%

Absorption Behaviours of Copper, Lead, and Arsenic in Aqueous Solution Using Date Palm Fibres and Orange Peel: Kinetics and Thermodynamics

Amin¹,

Alazba²,

Amin³

2017

Pol. J. Environ. Stud.

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“…Other studies are those reported by Liao et el. [4] (microwave modified bamboo charcoal), Rafatullah et al [5] (low cost adsorbent), Malana et al [6] (polymeric gels), El Qada et al [7] (activated carbon), Annadura et al [1] (cellulose-based waste), Malik [8] (activated carbon from wood sawdust), Halder et al [9] (thermally modified granular charcoal), Onai [10] (activated carbon prepared from apricot waste), Perira et al [11] (carbons), Tahir and Rauf [12] (bentonite clay), Vega-Negron et al [13] (chitosan/cellulose beads), Beheshti et al [14] (supramolecular complex) , Naeem et al [15] (graphene oxide sheets integrated with gold nanoparticles), Ogata et al [16] (poly-y-glutamic acid), El Alouani et al [17] (fly ashbased geopolymer), Adeyemo et al [18] (clay), etc. However, most of the reported studies on the adsorption of dyes have not paid significant attention on the potential of neem seed as an adsorbent nor fully explored detail mechanism for their adsorption.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Odoemelam

Emeh

Eddy

2018

Journal of Taibah University for Science

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Adsorption of methylene blue and malachite green dyes from aqueous solution by neem leaves was studied using experimental and computational chemistry approaches. The two dyes have N-H stretch, C≡C vibration vibration, C=C stretch and C-Cl stretch as common functional groups. Batch adsorption experiments were concluded by measuring absorbance (at wavelength of maximum absorption, i.e. 660 and 630 nm for methylene blue and malachite green dyes, respectively). The adsorption of the dyes on neem leaves favoured Langmuir and Temkin isotherms and was influenced by concentration, biomass dose, pH and by contact time, and favoured chemisorption mechanism. Although surface adsorption and intra particle diffusion were identified as the rate-limiting steps, a pseudo second-order kinetics was also favoured. Quantum chemical analysis supported better adsorption of methylene blue dye on neem seed surface than malachite green dye and through Fukui function analysis, the site for adsorption of the dyes was proposed.ARTICLE HISTORY

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“…This might be attributed to the surface charge of the natural bentonite. Bentonite is positively charged at low pH values and negatively charged at higher pH (Tahir and Rauf, 2006). Therefore the electrostatic interactions between the positively charged alkylamino groups in the dye molecule and the negatively charged adsorbent increased.…”

Section: Effect Of Ph On Adsorptionmentioning

confidence: 96%

Adsorption From Aqueous Solution Onto Natural and Acid Activated Bentonite

Al-Khatib

Fraige

Al-Hwaiti

et al. 2012

American Journal of Environmental Sciences

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Dyes have long been used in dyeing, paper and pulp, textiles, plastics, leather, paint, cosmetics and food industries. Nowadays, more than 100,000 commercial dyes are available with a total production of 700,000 tones manufactured all over the world annually. About 10-15% of dyes are being disposed off as a waste into the environment after dyeing process. This poses certain hazards and environmental problems. The objective of this study is to investigate the adsorption behavior of Methylene Blue (MB) from aqueous solution onto natural and acid activated Jordanian bentonite. Both bentonites are firstly characterized using XRD, FTIR and SEM techniques. Then batch adsorption experiments were conducted to investigate the effect of initial MB concentration, contact time, pH and temperature. It was found that the percentage of dye removal was improved from 75.8% for natural bentonite to reach 99.6% for acid treated bentonite. The rate of MB removal followed the pseudo second order model with a high correlation factor. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The Langmuir isotherm model was found more representative. The results indicate that bentonite could be employed as a low cost adsorbent in wastewater treatment for the removal of colour and dyes.

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Removal of a cationic dye from aqueous solutions by adsorption onto bentonite clay

Cited by 608 publications

References 29 publications

Absorption Behaviours of Copper, Lead, and Arsenic in Aqueous Solution Using Date Palm Fibres and Orange Peel: Kinetics and Thermodynamics

Absorption Behaviours of Copper, Lead, and Arsenic in Aqueous Solution Using Date Palm Fibres and Orange Peel: Kinetics and Thermodynamics

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Adsorption From Aqueous Solution Onto Natural and Acid Activated Bentonite

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