Iron oxide/carbon nanotubes/chitosan magnetic composite film for chromium species removal

Neto, José de Oliveira Marques; Bellato, Carlos Roberto; Silva, Danilo de Castro

doi:10.1016/j.chemosphere.2018.11.080

Cited by 65 publications

(16 citation statements)

References 65 publications

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“…Therefore, the removal of Cr(VI) is favoured at a lower pH because of the electrostatic attraction between the protonated surface and negatively charged dichromate ions. [ 27 ]…”

Section: Resultsmentioning

confidence: 99%

Multiwalled CNTs for Cr(VI) removal from industrial wastewater: An advanced study on adsorption, kinetics, thermodynamics for the comparison between the embedded and non‐embedded carboxyl group

Verma

Goel²,

Balomajumder

2020

Can J Chem Eng

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The adsorption capabilities of multiwalled carbon nanotubes (MWCNTs) with and without the embedded carboxyl group for the removal of parts per million levels of hexavalent chromium were examined as a function of several parameters, namely contact time, pH of initial solution, initial concentration of Cr(VI), adsorbent dosage as well as temperature of solution. Adsorption isotherms have been utilized to explain the adsorption mechanism. Ion exchange, intra-particle diffusion, and electrostatic interactions are found to be the fundamental mechanisms describing the adsorption of Cr(VI). The maximum adsorption capacities of Cr(VI) ion by raw MWCNTs and functionalized MWCNTs were found to be 84.75 and 78.13 mg Á g −1 , respectively, as calculated by the Langmuir adsorption isotherm model. This is with regard to the electron-rich atoms inside the functional group which repels the negatively charged dichromate ions. Kinetic studies were performed, and the data was found in good agreement with the pseudo-second-order.

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“…Therefore, the removal of Cr(VI) is favoured at a lower pH because of the electrostatic attraction between the protonated surface and negatively charged dichromate ions. [ 27 ]…”

Section: Resultsmentioning

confidence: 99%

Multiwalled CNTs for Cr(VI) removal from industrial wastewater: An advanced study on adsorption, kinetics, thermodynamics for the comparison between the embedded and non‐embedded carboxyl group

Verma

Goel²,

Balomajumder

2020

Can J Chem Eng

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show abstract

“…Therefore, the removal of Cr(VI) is favoured at a lower pH due to the electrostatic attraction between the protonated surface and negatively charged dichromate ions. [ 26 ]…”

Section: Resultsmentioning

confidence: 99%

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Verma

Balomajumder

2020

Can J Chem Eng

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In this work, aluminum industrial waste, red mud (RM), was activated to verify its potential in the management of electroplating wastewater containing hexavalent chromium (Cr(VI)). A comparison between the adsorption capabilities of RM and activated red mud (ARM) towards Cr(VI) from aqueous solutions was made. The effects of several parameters were evaluated. The adsorbents were characterized by field emission scanning electron microscopy (FESEM), Fourier transmission infrared spectroscopy (FTIR), x-ray diffraction (XRD), zeta potential, and thermogravimetric analysis (TGA). The particle size was observed as 23.59 nm. The ARM demonstrated an acceptable adsorption capacity of 25.641 mg/g at a pH of 2, adsorbent dosage of 2 g/L, initial Cr(VI) concentration of 100 mg/L, at 25 C. The experimental data is in good agreement with Langmuir adsorption isotherm. The kinetic study was performed to verify that the adsorption follows pseudo-second-order kinetics. In addition, the ARM showed decent recyclability for adsorbing Cr(VI) as even after three adsorption cycles, and the adsorption capacity was reduced by 30%. The results recommend ARM to be an efficient and cost-effective adsorbent for Cr(VI) removal from industrial wastewater.

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“…Many methods have been demonstrated to be efficient for Cr(VI) removal, such as: ion exchange [5,6], electrochemical treatment [7][8][9], chemical precipitation [10], coagulation [11], chemical reduction [12,13], and adsorption [3,[14][15][16][17]. Some biological treatments [18,19] (phytoremediation [20]) are also applied to remove chromium (VI) from wastewater and groundwater.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Removal of Chromium (VI) from Wastewater

2019

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The removal of hexavalent chromium has attracted much attention as it is a hazardous contaminant. Electrochemical reduction technology was applied to remove chromium (VI) from wastewater. The mechanisms and parameters that affect the reduction process were investigated. The results showed that the reduction efficiency was significantly affected by the concentration of H2SO4, current density, and reaction temperature. The reduction efficiency was up to 86.45% at an H2SO4 concentration of 100 g/L, reaction temperature of 70 °C, current density at 50 A/m2, reaction time at 180 min, and stirring rate of 500 rpm. The reduction process of chromium (VI) followed a pseudo-first-order equation, and the reduction rate constant could be expressed as Kobs = k [H2SO4]1·[j]4·exp−4170/RT.

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Iron oxide/carbon nanotubes/chitosan magnetic composite film for chromium species removal

Cited by 65 publications

References 65 publications

Multiwalled CNTs for Cr(VI) removal from industrial wastewater: An advanced study on adsorption, kinetics, thermodynamics for the comparison between the embedded and non‐embedded carboxyl group

Multiwalled CNTs for Cr(VI) removal from industrial wastewater: An advanced study on adsorption, kinetics, thermodynamics for the comparison between the embedded and non‐embedded carboxyl group

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Electrochemical Removal of Chromium (VI) from Wastewater

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