Dual-mode adsorption of cochineal natural dye on wool fibers: Kinetic, equilibrium, and thermodynamic studies

Mirnezhad, Somayeh; Safapour, Siyamak; Sadeghi‐Kiakhani, Mousa

doi:10.1007/s12221-017-6923-3

Cited by 31 publications

(19 citation statements)

References 26 publications

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“…hydrogen bonding, van der Waals forces and hydrophobic interactions) between dye and fibre. In addition, due to the presence of the –COOH functional group (the main colouring component of cochineal) in carminic acid, cochineal behaves like anionic dye in acidic media . Consequently, the adsorption of dye is possible because of electrostatic interactions between the ionised carboxyl groups of the dye (–COO − ) and terminal protonated amino groups (–NH 3 + ) of the polyamide fibre.…”

Section: Resultsmentioning

confidence: 99%

“…hydrogen bonding, van der Waals forces and hydrophobic interactions) between dye and fibre. In addition, due to the presence of the -COOH functional group (the main colouring component of cochineal) in carminic acid, cochineal behaves like anionic dye in acidic media [19].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the kinetic, thermodynamic and equilibrium characteristics of wool dyeing with cochineal were investigated . Results demonstrated the crucial role of dyeing pH in assessments of the dyeing mechanism and the type of dyeing adsorption isotherm.…”

Section: Introductionmentioning

confidence: 99%

“…Although the effects of some significant parameters on the dyeing of textile fibres with cochineal have been investigated , less attention has been paid to thermodynamic and kinetic studies of polyamide dyeing with cochineal. Determining thermodynamic and kinetic parameters of cochineal dyeing on polyamide would help with understanding the dye adsorption mechanism in order to achieve better control of the dyeing process.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Sadeghi‐Kiakhani

Safapour

Mirnezhad

2018

Coloration Technology

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The adsorption behaviour of the natural dye cochineal on polyamide 66 was studied at different pH values. The thermodynamic and kinetic parameters such as standard affinity (−Δμ˚), changes in enthalpy (ΔH˚) and entropy (ΔS˚), diffusion coefficient and activation energy of the diffusion, were determined for pH values of 3 and 6. Results indicated that the experimental data fitted appropriately with the Nernst isotherm. Furthermore, the partitioning ratio and −Δμ˚ decreased significantly with increasing temperature, and it was revealed that the adsorption of cochineal onto polyamide was an exothermic process. The −Δμ˚ value of polyamide dyed at pH 3 was higher than that dyed at pH 6. This is related to higher numbers of electrostatic and non‐electrostatic interactions between cochineal and polyamide at pH 3, whereas at pH 6 non‐electrostatic hydrophobic interactions between cochineal and polyamide are dominant. At pH 6 comparatively higher negative values for ΔH˚ and ΔS˚ were obtained. The diffusion coefficient increased with rises in temperature. The polyamide dyed at pH 3 had a higher diffusion coefficient at every temperature than the polyamide dyed at pH 6. The dyeing rate for polyamide at pH 3 was higher than at pH 6 and reached equilibrium in a shorter time. Furthermore, a lower activation energy of diffusion was obtained at pH 3 compared to pH 6.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Sadeghi‐Kiakhani

Safapour

Mirnezhad

2018

Coloration Technology

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“…Meanwhile, the peaks in the range 1900–2700 cm −1 cannot be attributed to the wool fiber, as natural wool fiber has no absorption peaks in this range [ 50 ]. As dyed wool fibers were used in the study, these peaks probably belong to the groups included in the dye composition [ 51 ]. In addition, as shown in Figure 8 , the intensity and width of the peaks in this range do not change through-out the adsorption/diffusion cycles.…”

Section: Ftir Analysis Of Cu X Se-coated Wool Fmentioning

confidence: 99%

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

2021

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A study of altering the conductive properties of wool fibers by applying copper selenide is presented. The researched modification of wool fibers was based on a two-stage adsorption-diffusion process. X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectrum, and Fourier transform infrared spectroscopy were performed to evaluate the morphological and physical characteristics of all CuxSe-coated wool fibers. X-ray diffraction (XRD) data showed a single, Cu0.87Se (klockmannite), crystalline phase present, while Atomic Absorption Spectroscopy (AAS) and Energy Dispersive X-ray (EDX) analyses showed that the concentrations of Cu and Se in copper selenide coatings depend on the number of wool fiber treatment cycles. It was determined that a dense layer of CuxSe grows through a nucleation mechanism followed by particle growth to fill out the complete surface. It was found that the conductivity of the coated wool fibers depends on the quality and density of the copper selenide coating, thus the resistance of electrically impermeable wool fibers can be reduced to 100 Ω by increasing the number of treatment cycles.

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Grafting of Wool with Alginate Biopolymer/Nano Ag as a Clean Antimicrobial and Antioxidant Agent: Characterization and Natural Dyeing Studies

et al. 2021

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There is a continuous search for sustainable materials and processes for dyeing and finishing of textiles to diminish the hazardous impact on the nature. In current study, the grafting of biocomposite Sodium Alginate-Silver nanoparticles (SA-Ag NPs) on the wool yarns was performed, and all samples were dyed with Cochineal and Madder dyes. The weight gain of the samples was measured to find the optimized SA-Ag NPs initial concentration, and the surface morphology of samples was studied by SEM-EDX. The color strengths of the treated samples were calculated, and the impacts of various parameters, including the initial dye concentration, pH, temperature, and duration were investigated . It was found that the pretreatment enhanced the dye-ability, antimicrobial, and antioxidant characteristics of the samples noticeably. To obtain the same color strength on the treated wool samples, one can use less amount of initial dye concentration, at a lower temperature, and for a shorter duration compared to the values needed for dyeing of untreated samples. The colorfastness characteristics of the treated samples remained the same, and no negative impact was observed.

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Dual-mode adsorption of cochineal natural dye on wool fibers: Kinetic, equilibrium, and thermodynamic studies

Cited by 31 publications

References 26 publications

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

Grafting of Wool with Alginate Biopolymer/Nano Ag as a Clean Antimicrobial and Antioxidant Agent: Characterization and Natural Dyeing Studies

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