Adsorption of carcinogenic dye Congo red onto prepared graphene oxide-based composites

Mizhir, Alaa A.; Abdulwahid, Ali Abdulrazzaq; Al-Lami, Hadi S.

doi:10.5004/dwt.2020.26141

Cited by 10 publications

(5 citation statements)

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“…acidity function pH = 5 and this increase in the %R values is attributed to the hydrostatic interactions between the solid phases and dyes, as for the acid functions that follow the optimum value and within the range (6-12), we notice a decrease in the values of %R, and this can be attributed to the fact that the hydroxyl radical OHwhose concentration increases with the increase of the acidic function competes with the dye molecules towards the solid phases. The value of the optimal pH function in extracting or removing the CR dye is equal to 5 and was identical to the results of previous studies [24,25].…”

Section: Effect Of Phsupporting

confidence: 85%

An efficient cheap source of activated carbon as solid phases for extraction and removal of Congo Red from aqueous solutions

Majid

Abdulwahid²

2022

Anal. Method Environ. Chem. J.

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The present study reported the preparation of solid phases from various available and cheap natural sources represented by activated carbon to remove the polluting dye Congo Red (CR). Activated carbon derived from the leaves of the Consocarpus plant (C/AC) and Ziziphus Spina-Christi plant (Z/AC) and Myrtus plant (M/AC) by chemical activation. The solid phases were diagnosed and examined using FTIR, FESE, and XRD. The results of the study indicated that the best amount for the solid phase was 0.25 g for the three solid phases used against dye, the optimal concentration of the CR was 100 mg L-1, and the optimum acidity function was equal to 5 with a volume of 25 mL, as the optimization experiments indicated that the best flow rate of the eluting solution was equal to 0.5 ml min-1. The elution processes were carried out using several solvents different in polarity and it was found that 8 mL of DMSO achieved the best percentage of recovery (%R). Also, the adsorption capacity based on the optimal conditions that were obtained by applying Langmuir and Freundlich isotherm models, and qmax, according to the Langmuir model, was (21.74, 23.53, 22.17) mg g-1 for (Z/AC), (C/AC), and (M/AC) adsorbents, respectively.

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Section: Effect Of Phsupporting

confidence: 85%

An efficient cheap source of activated carbon as solid phases for extraction and removal of Congo Red from aqueous solutions

Majid

Abdulwahid²

2022

Anal. Method Environ. Chem. J.

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“…As such, a fractional reaction order follows. [31] In general, the heat of adsorption of reaction intermediates decreases linearly with the total coverage as a result of the repulsive interactions between the adsorbate molecules. In this case, we assume a coverage between 0.2 and 0.8 and the fluxes for the first reaction can be adjusted by adding a term which refers to the change in adsorption free enthalpy as follows: [12,32]…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Influence of Intercalated Anions in NiFe LDH on the Electrocatalytic Behavior of OER: A Kinetic Study

Berger,

Popa,

Negahdar

et al. 2023

ChemElectroChem

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The oxygen evolution reaction (OER) as one half‐cell reaction of electrochemical water splitting has a fundamental impact on water splitting efficiency and thus on the competitiveness of electrochemically generated hydrogen in the energy market. Nickel‐iron layered double hydroxides (NiFe LDH) are among the most promising electrocatalysts for efficient OER under alkaline conditions. Despite intensive research, correlations of the material properties and the resulting kinetically limiting surface processes are poorly investigated. This work focuses on the kinetic behavior of NiFe LDH catalysts containing different anions in the basal spacing in alkaline OER. Steady‐state Tafel plots, impedance measurements as well as reaction order plots were used to elucidate differences in the catalytic performance. All catalysts showed a dual Tafel behavior and fractional reaction orders. For kinetic modelling, the physisorbed hydrogen peroxide mechanism and Temkin adsorption model were adopted to fit experimental data. Our study showed that the intercalated anions affect the kinetics of rate determining steps. The hypophosphite intercalated LDH possessed the highest OER activity and the first step as rate determining. While for both carbonate and borate intercalated NiFe LDH, the second step proved to be rate determining in the low Tafel region, while the first step was found to be rate‐limiting in the high Tafel region.

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“…The duration time before the process of adsorption reaches equilibrium called contact time [38]. At the initial concertation of each adsorbent and optimal pH at different temperatures, the effects of contact time on CR and BB dyes adsorption on the prepared hydrogel were investigated.…”

Section: Effect Of Time and Temperature On Adsorptionmentioning

confidence: 99%

Preparation of Semi IPNs-Hydrogel Composite for Removing Congo Red and Bismarck Brown Y from Wastewater: Kinetic and Thermodynamic Study

2021

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Modified acrylamide-based semi-interpenetrating polymer network (semi-IPN) hydrogel composites were prepared for Congo red (CR) and Bismarck brown Y (BBY) dyes adsorption from aqueous solutions. Adsorption for both dyes was studied in batch mode and results show adsorption highly dependent on concentration, solution pH, and contact time. The prepared hydrogels exhibited a high adsorption capability. Also, the kinetic studies indicated that the adsorption of dyes followed the pseudosecond-order model and was found to match well with the Langmuir isotherm model. Thermodynamic studies showed that the adsorption process was spontaneous and endothermic. The prepared hydrogel composites also exhibit good regeneration efficiency for the four successive adsorption-desorption cycles. Based on these analyses, it can be concluded that these adsorbents be acted as an efficient option for the removal of contaminant dyes from aqueous solutions.

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Adsorption of carcinogenic dye Congo red onto prepared graphene oxide-based composites

Cited by 10 publications

References 0 publications

An efficient cheap source of activated carbon as solid phases for extraction and removal of Congo Red from aqueous solutions

An efficient cheap source of activated carbon as solid phases for extraction and removal of Congo Red from aqueous solutions

Elucidating the Influence of Intercalated Anions in NiFe LDH on the Electrocatalytic Behavior of OER: A Kinetic Study

Preparation of Semi IPNs-Hydrogel Composite for Removing Congo Red and Bismarck Brown Y from Wastewater: Kinetic and Thermodynamic Study

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