Optimization of crystal violet adsorption onto Date palm leaves as a potent biosorbent from aqueous solutions using response surface methodology and ant colony

Ghazali, Abolfazl; Shirani, Mahboube; Semnani, Abolfazl; Zare-Shahabadi, Vahid; Nekoeinia, Mohsen

doi:10.1016/j.jece.2018.05.043

Cited by 77 publications

(24 citation statements)

References 44 publications

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“…Figure 7 b shows the adsorbent surface charge neutrality at pH 5.35 which indicates the prevalence of positive surface charges when the solution pH < pHpzc and negatively charged pH > pHpzc, respectively [ 56 ]. RO16 dye being an anionic dye is overwhelmingly attracted by the surface of MA-AC400 under acidic conditions as described above, followed by a decrease under alkaline conditions [ 57 ]. The isoelectric nature of adsorbent surface and dye molecules under alkaline conditions results in repulsive interactions hindering the maximum dye uptake from aqueous solution [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Phosphoric Acid Activated Carbon from Melia azedarach Waste Sawdust for Adsorptive Removal of Reactive Orange 16: Equilibrium Modelling and Thermodynamic Analysis

et al. 2020

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Waste wood biomass as precursor for manufacturing activated carbon (AC) can provide a solution to ever increasing global water quality concerns. In our current work, Melia azedarach derived phosphoric acid-treated AC (MA-AC400) was manufactured at a laboratory scale. This novel MA-AC400 was tested for RO16 dye removal performance as a function of contact time, adsorbent dosage, pH, temperature and initial dye concentration in a batch scale arrangement. MA-AC400 was characterized via scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, dynamic light scattering (DLS) and fluorescence spectroscopy. MA-AC400 is characterized as mesoporous with BET surface area of 293.13 m2 g−1 and average pore width of 20.33 Å. pHPZC and Boehm titration confirm the acidic surface charges with dominance of phenolic functional groups. The average DLS particle size of MA-AC400 was found in the narrow range of 0.12 to 0.30 µm and this polydispersity was confirmed with multiple excitation fluorescence wavelengths. MA-AC400 showed equilibrium adsorption efficiency of 97.8% for RO16 dye at its initial concentration of 30 mg L−1 and adsorbent dose of 1 g L−1. Thermodynamic study endorsed the spontaneous, favorable, irreversible and exothermic process for RO16 adsorption onto MA-AC400. Equilibrium adsorption data was better explained by Langmuir with high goodness of fit (R2, 0.9964) and this fitness was endorsed with lower error functions. The kinetics data was found well fitted to pseudo-second order (PSO), and intra-particle diffusion kinetic models. Increasing diffusion constant values confirm the intraparticle diffusion at higher RO16 initial concentration and reverse was true for PSO chemisorption kinetics. MA-AC400 exhibited low desorption with studied eluents and its cost was calculated to be $8.36/kg.

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Section: Resultsmentioning

confidence: 99%

Phosphoric Acid Activated Carbon from Melia azedarach Waste Sawdust for Adsorptive Removal of Reactive Orange 16: Equilibrium Modelling and Thermodynamic Analysis

et al. 2020

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“…Another important factor affecting the adsorption process is pH of the sample solution. 41 The effect of pH in the range of 1-4 is depicted in Fig. 4a as well.…”

Section: Effect Of Adsorbent Mesh Size and Phmentioning

confidence: 97%

Adsorption Behavior of Fe(II) and Fe(III) Ions on Polyaniline Coated Sawdust: Batch and Fixed–Bed Studies

Mansoor

Abbasitabar

2020

ACSi

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The aim of this study is to investigate the suitability of polyaniline coated-sawdust (SD/PAni) as an adsorbent for removal of Fe(II) and/or Fe(III) ions from aqueous solutions. The study includes batch and column tests. With column experiments, the influence of different experimental parameters on the adsorption behavior of Fe(II), Fe(III), and a mixture of both ions were studied and it was found that the optimum adsorption conditions for individual iron species and a mixture of them were similar. The optimal values for pH, flow rate, temperature, and adsorbent mesh size were found to be 4.0, 5.0 mL min −1 , 25 °C, and 100 BSS mesh, respectively. Batch experiments were carried out to study the adsorption isotherms at ambient temperature. The results demonstrated that the adsorption isotherms for both iron species were best represented by the multilayer adsorption isotherm model. The adsorption-desorption stability performance of the adsorbent was evaluated and confirmed over 5 cycles.

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“…This suggests the significant role of electrostatic forces during the process of adsorption. 58 The adsorption process can be fathomed based on the ion exchange mechanism between the biosorbent and the studied polluters. Its contribution is illustrated through the replacement of protons from the exchangeable sites on the biosorbent surface with polluters, i.e., metal ions.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Perspectives regarding metal/mineral-incorporating materials for water purification: with special focus on Cr(vi) removal

et al. 2020

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Optimization of crystal violet adsorption onto Date palm leaves as a potent biosorbent from aqueous solutions using response surface methodology and ant colony

Cited by 77 publications

References 44 publications

Phosphoric Acid Activated Carbon from Melia azedarach Waste Sawdust for Adsorptive Removal of Reactive Orange 16: Equilibrium Modelling and Thermodynamic Analysis

Phosphoric Acid Activated Carbon from Melia azedarach Waste Sawdust for Adsorptive Removal of Reactive Orange 16: Equilibrium Modelling and Thermodynamic Analysis

Adsorption Behavior of Fe(II) and Fe(III) Ions on Polyaniline Coated Sawdust: Batch and Fixed–Bed Studies

Perspectives regarding metal/mineral-incorporating materials for water purification: with special focus on Cr(vi) removal

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