Adsorption behavior of MnO2 functionalized multi-walled carbon nanotubes for the removal of cadmium from aqueous solutions

Luo, Chao; Wei, Rongyan; Guo, Dan; Zhang, Shengfang; Yan, Shan

doi:10.1016/j.cej.2013.03.128

Cited by 163 publications

(72 citation statements)

References 50 publications

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“…Between these two stages of the uptake, the rate of adsorption is found to be nearly constant. This is obvious from the fact that a large number of vacant surface sites are available for adsorption during the initial stage, and after a lapse of time, the remaining vacant surface sites are difficult to be occupied due to repulsive forces between the solute molecules on the solid and bulk phases (Luo et al, 2013).…”

Section: Kinetic Studiesmentioning

confidence: 99%

Adsorption of peroxidase from Raphanus sativus L onto alginate–guar gum matrix: Kinetic, equilibrium and thermodynamic analysis

Silva

Valetti

Brassesco

et al. 2016

Adsorption Science & Technology

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This work explores the kinetics, equilibrium and thermodynamics of peroxidase adsorption onto spherical guar gum-alginate matrices. The effect of contact time, solution pH, initial protein concentration and temperature was studied in batch experiments. The results show that peroxidase adsorption increased with rising contact time and initial enzyme concentration, and was higher at pH 4.0. The kinetic processes can be predicted by both the pseudo-first-order rate kinetics and the pseudo-second-order rate kinetics. Equilibrium adsorption data were analyzed with different isotherm models. The experimental data fitted to the Freundlich model in

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Section: Kinetic Studiesmentioning

confidence: 99%

Adsorption of peroxidase from Raphanus sativus L onto alginate–guar gum matrix: Kinetic, equilibrium and thermodynamic analysis

Silva

Valetti

Brassesco

et al. 2016

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…Next, the residual concentrations of cadmium were detected the equilibrium data were fitted to the Langmuir and Freundlich isotherms (equations: 5 and 6) (Coruh et al, 2014;Luo et al, 2013;Salman et al, 2016). constants.…”

Section: Reaction Kinetic and Adsorption Isothermmentioning

confidence: 99%

Cadmium Removal by using Pumice Modified with Iron Nanoparticles from Aqueous Solutions

2016

Global NEST Journal

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In this study, the removal of cadmium by using pumice coated with iron nanoparticles (INPs) from synthetic wastewater was investigated. The effects of parameters influencing adsorption: contact time (10-20 min), pH (3-9), initial cadmium concentration (25-125 mg l ) were studied. The pumice stone used in this research was, first, crashed and then sieved with 20 mesh standard sieves (0.85 mm); finally, it was coated with INPs. An atomic absorption spectrophotometer was used to measure cadmium contents and isotherm models and adsorption kinetics were studied. The results showed the adsorption process of cadmium reached equilibrium at contact time of 80 min. With increasing pH solution, the efficiency enhanced which peaked at pH 7-8. Cadmium concentration increase resulted in a decrease in efficiency, whereas adsorbent dose increase improved it. Equilibrium data of adsorption followed isotherms models: Langmuir and Freundlich. The highest removal efficiency and adsorption capacity were, respectively, 83% and 17.27 mg g -1 . Furthermore, absorption kinetics is better described by the pseudo second-order model. According to the results obtained, pumice coated with INPs is an effective adsorbent and can be introduced as a suitable option in practical applications.

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“…Examples include chemical sensors, catalyst supports, and hydrogen storage [3]. Since it has been demonstrated that carbon nanotubes possess potential for the removal of many kinds of pollutants from aqueous solutions due to their large surface areas along with their ability to establish π-π electrostatic interactions, carbon nanotubes have been focused on widely in analytical chemistry and environmental protection in particularly [4].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study on the Heavy Metal Ions Removal from Aqueous Solutions Using Multi-Walled Carbon Nanotubes

Chen

Liu

2016

ILCPA

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Abstract. Kinetic study on the removal of zinc(II), copper(II), lead(II) and cadmium(II) from the aqueous solutions using multi-walled carbon nanotubes (MWNTs) was carried out to examine the temperature effect on the adsorption of zinc(II), copper(II), lead(II) and cadmium(II) as well as to explore the potentiality of using carbon nanotubes as a promising adsorbent for environmental remediation. Multi-walled carbon nanotubes were characterized by BET (Brunauer-Emmett-Teller), FE-SEM (Field emission scanning electron microscopy), and DPASV (differential pulse anodic stripping voltammetry). Adsorption experiments were carried out and comparisons with the previous work were made. Experimental results showed that the multi-walled carbon nanotubes can successfully remove zinc(II), copper(II), lead(II) and cadmium(II) from aqueous solutions. Increasing solution temperature can significantly improve the removal efficiency because of the endothermic nature of adsorption process. The kinetics of zinc(II), copper(II), lead(II) and cadmium(II) adsorption on multi-walled carbon nanotubes were analyzed, and the calculation results showed that the heavy metal ions adsorption is a pseudo-second-order process, and its capacity increases with increasing solution temperature. The binding of the metal ions by the multi-walled carbon nanotubes was evaluated from the adsorption capacities and found in the following order: copper(II) > lead(II) > zinc(II) > cadmium(II). Finally, multi-walled carbon nanotubes demonstrated that they are a promising adsorbent for the removal of heavy metal ions from aqueous solutions.

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Adsorption behavior of MnO2 functionalized multi-walled carbon nanotubes for the removal of cadmium from aqueous solutions

Cited by 163 publications

References 50 publications

Adsorption of peroxidase from Raphanus sativus L onto alginate–guar gum matrix: Kinetic, equilibrium and thermodynamic analysis

Adsorption of peroxidase from Raphanus sativus L onto alginate–guar gum matrix: Kinetic, equilibrium and thermodynamic analysis

Cadmium Removal by using Pumice Modified with Iron Nanoparticles from Aqueous Solutions

Kinetic Study on the Heavy Metal Ions Removal from Aqueous Solutions Using Multi-Walled Carbon Nanotubes

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