Isotherm and Kinetics Parametric Studies for Aqueous Hg(II) Uptake onto N-[2-(Methylamino)Ethyl]Ethane-1,2-Diaminated Acrylic Fibre

Hashem, A.; Abou‐Okeil, A.; Fikry, Mohammad; Aly, Amal; Aniagor, Chukwunonso O.

doi:10.1007/s13369-021-05416-x

Cited by 19 publications

(8 citation statements)

References 44 publications

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“…According to Nwosu, et al [50], pHPZC is the pH value at which a given adsorbents' surface possesses a net neutral charge. Studies [51,52] have also shown that at adsorbate solution pH values higher than the pHPZC, the adsorbent surface will be predominately negative and vice versa [53]. From Figure 3a, the pHPZC of AC was recorded at pH 4.1, an indication of the relative surface acidity of the AC.…”

Section: Point Of Zero Charge (Phpzc) and The Effect Of Phmentioning

confidence: 93%

“…Meanwhile, the intraparticle diffusion model parameter provides further insight into the prevalent adsorption mechanism. Table 3 depicts an intraparticle diffusion c-value of 63.30 and based on literature reports, such a high value (c >>> 1) is synonymous with the occurrence of substantive boundary layer effect within the system [52]. Thus, intraparticle diffusion cannot be regarded as a probable sorption mechanism in the study [58].…”

Section: Adsorption Kineticsmentioning

confidence: 96%

“…This inverse relationship between the adsorption capacity and adsorbent dosage is explained by the fact that high adsorbate-adsorbent site affinity predominated at the initial low adsorbent dosage (0.2 g/L) [56]. Meanwhile, with the increasing adsorbent concentration (from 0.3 to 10.0 g/L) the sorption capacity consistently diminished (despite the supposed increase in available sorption sites), due to possible active sites clogging, overcrowding and interference [52]. Using different modified activated carbon, Alhan, et al [57] and Nejadshafiee, et al [26] also reported a similar variation between the heavy metal uptake capacity and the adsorbent dosage.…”

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

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Equilibrium and Kinetic Modelling of Aqueous Cadmium Ion and Activated Carbon Adsorption System

Aniagor

Elshkankery

Fletcher

et al. 2021

Water Conserv Sci Eng

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Despite their extensive and decade long application in wastewater treatment, activated carbon remains one of the most viable adsorbents, with substantive practical application, due to their high pollutant binding capacity. In this study, commercially available activated charcoal was applied in the uptake of aqueous cadmium [Cd(II)] ion. The effect of some process variables on the Cd (II) uptake was investigated via batch mode. Furthermore, the adsorbents' surface charge (pHPZC), surface morphology (using SEM) and available surface functional groups (using FTIR) were explained. The pH dependence of the present adsorption system was revealed, with the optimum pH was recorded at pH 5.0. Similarly, the Cd (II) uptake (mg/g) decreased with increasing adsorbent dosage due to possible active sites clogging, overcrowding and interference Furthermore, the isothermal and kinetics analyses of the experimental data, that were aptly validated using the hybrid error model, respectively depicted the Langmuir isotherm and pseudosecond-order kinetic model as the best fit. A Langmuir adsorption capacity of 682.5 mg g -1 was also recorded in the study. Consequently, the present adsorption system was characterized by an equilibrium timeframe of industrial practicability, hence the adsorbent was successfully applied for the aqueous Cd (II) uptake.

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Section: Point Of Zero Charge (Phpzc) and The Effect Of Phmentioning

confidence: 93%

Section: Adsorption Kineticsmentioning

confidence: 96%

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

See 1 more Smart Citation

Equilibrium and Kinetic Modelling of Aqueous Cadmium Ion and Activated Carbon Adsorption System

Aniagor

Elshkankery

Fletcher

et al. 2021

Water Conserv Sci Eng

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“…) significantly degrades water quality, thus, making it unsuitable for use as a direct source of potable water for industrial applications (Panagopoulos 2021). These issues have worsened the problem of freshwater scarcity over the last two decades (Panagopoulos 2022 ;Hashem et. al.…”

Section: Introductionmentioning

confidence: 99%

A comparative optimization and modeling of ammonia–nitrogen adsorption from abattoir wastewater using a novel iron-functionalized crab shell

et al. 2022

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High-grade adsorbent (Fe–CS) was successfully synthesized from waste crab shells (CS) for the adsorptive removal of ammonia–nitrogen (A–N) from abattoir wastewater. Fe–CS was analyzed using Fourier transform infrared spectroscopy, x-ray diffraction, Scanning electron microscopy, and Thermogravimetric analysis. The characterization results indicated that Fe–CS possessed important qualities required for surface-driven chelation. The analysis of variance result showed that Fe–CS dosage (with f–value of 284.5) was the most effective process parameter of influence during A-N adsorption. The regression coefficients obtained from the process modeling illustrated the applicability of RSM (R2 = 0.9799), ANN (R2 = 0.9025), and ANFIS (R2 = 0.9998) in predicting the A–N adsorptive removal, while the comparative statistical analysis established the superiority of ANFIS model over ANN and RSMs’ data prediction accuracy. The optimization result further demonstrated that ANFIS–GA predicted an optimum removal efficiency of 92.60% at pH of 6.5, a dosage of 2.2 g, A–N conc. of 18.8 mg/L, Temp. of 317 K, and adsorption time of 156 min. The mechanistic plot obtained from Weber–Morris model depicted that three regions were involved in the adsorption process. Boyd model parameters revealed that intraparticle diffusion controlled the process at low A–N concentration (A–N concentration ≤ 15 mg/L), while film diffusion dominated the adsorption process at concentrations higher than 15 mg/L. The average Gibbs free energy value ($$- \Delta G^{0}$$ - Δ G 0 = 3.08212 kJ/mol), enthalpy ($$\Delta H^{0}$$ Δ H 0 = 4.1150 kJ/mol), activation energy ($$E_{A}$$ E A = 3.7454 kJ/mol) and entropy ($$\Delta S^{0}$$ Δ S 0 = 22.9710 J/mol K) obtained from thermodynamic studies confirmed the spontaneous, endothermic, favorable and physical nature of the process.

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“…Similarly, the high operational cost and process inefficiency associated with the application of electrodialysis and reverse osmosis has also been highlighted [19]. However, the adsorption technique has been commonly applied due to its operational flexibility and economics, as well as low sludge generation [20,21]. Also, the spent adsorbent could have agricultural application as a phosphate fertilizer and soil conditioner [22].…”

Section: Introductionmentioning

confidence: 99%

Equilibrium studies on the uptake of nitrate and phosphate ion onto low-cost adsorbent prepared via radiation-induced graft polymerization and hydrazine hydrate functionalization

Aniagor

Sokker²,

Hashem

et al. 2021

Preprint

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In the study, cellulosic fabric waste-based anion exchanger (‘Cell-AE’), with abundant N+(CH3)2 functional groups were prepared by graft copolymerization of acrylonitrile (AN) onto cotton fabric waste using γ radiation 60Co, followed by chemical modification with hydrazine hydrate and alkylation with dimethyl sulfate. Factors affecting the grafting process, such as radiation dose and monomer concentration, was investigated. The main adsorbent (‘Cell-AE’) and its intermediate precursors were characterized using Fourier transform infrared spectroscopy (FTIR) and scan electron microscopy (SEM). The nitrate and phosphate sorption potentials of the Cell-AE further evaluated via batch mode. Based on the results obtained, ‘Cell-AE’ showed higher adsorption affinity towards phosphate ion (19.56 mg/g), when compared to that of the nitrate ion (11.23 mg/g). Similarly, the phosphate and nitrate ion adsorption onto ‘Cell-AE’ obeys both Dubinin–Radushkevich (D-R) and Redlich-Peterson (R-P) isotherm models, respectively. The present study conclusively proffered a potential mitigation approach to cotton fabric waste management.

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Isotherm and Kinetics Parametric Studies for Aqueous Hg(II) Uptake onto N-[2-(Methylamino)Ethyl]Ethane-1,2-Diaminated Acrylic Fibre

Cited by 19 publications

References 44 publications

Equilibrium and Kinetic Modelling of Aqueous Cadmium Ion and Activated Carbon Adsorption System

Equilibrium and Kinetic Modelling of Aqueous Cadmium Ion and Activated Carbon Adsorption System

A comparative optimization and modeling of ammonia–nitrogen adsorption from abattoir wastewater using a novel iron-functionalized crab shell

Equilibrium studies on the uptake of nitrate and phosphate ion onto low-cost adsorbent prepared via radiation-induced graft polymerization and hydrazine hydrate functionalization

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