Removal of crystal violet dye by a novel adsorbent derived from waste active sludge used in wastewater treatment

Şahbaz, Deniz Akın; Dandıl, Sahra; Açıkgöz, Çağlayan

doi:10.2166/wqrj.2019.049

Cited by 18 publications

(6 citation statements)

References 25 publications

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“…Furthermore, higher metal concentration provided increase in driving force of the concentration gradient to overwhelm all mass transfer resistance of Cr(VI) ions between liquid and solid phases. Consequently, the probability of collision between the adsorbate and adsorbent active sites increase and thus leading to higher Cr(VI) uptake [39,40]. These observations are consistent with previous reports [41,42].…”

Section: Influence Of Initial Concentrationsupporting

confidence: 91%

“…A specified amount of the adsorbent was added to a series of 100 cm 3 of the Cr(VI) solution of fixed concentration (150 mg dm -3 ). The contents were agitated for different time intervals (20,40,60,80, 100, 120, 180 and 240 min) under room temperature (30 ± 2 °C). The mixture after each time interval were centrifuged immediately and subjected to analysis.…”

Section: Influence Of Contact Timementioning

confidence: 99%

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Equilibrium and Thermodynamic Studies on Adsorption of Hexavalent Chromium from Aqueous Solution onto Low Cost Activated Carbon

Yunusa¹,

Ibrahim²

2020

IJEM

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The removal of hexavalent chromium [Cr(VI)] is a challenging task due to its acute toxicity even at low concentration. In the present study, a low-cost activated carbon (LAC) was prepared from desert date seed shell by chemical activation with H 3 PO 4 and utilized for the removal of hexavalent chromium from aqueous solution. Batch experiments were conducted to investigate the influence of operating variables such as pH, contact time, adsorbent dosage, initial concentration, co-existing ions and temperature. The amount of Cr(VI) adsorbed was found to vary with solution pH and maximum adsorption was observed at a pH value of 2.0. The extent of chromium uptake (mg g-1) was found to increase with increase in initial concentration and contact time. The applicability of the four isotherm models for the present equilibrium data follows the sequence: Freundlich > Temkin > Langmuir > Dubinin-Radushkevich. The mean free energy from the Duninin-Radushkevic isotherm model hinted that the adsorption of Cr(VI) onto the adsorbent surface follows physisorption mechanism. Thermodynamic parameters related to adsorption, Gibbs free energy change (∆G°), enthalpy change (∆H°), entropy change (∆S°), were also calculated and the negative value of ∆H° indicates the exothermic nature of the adsorption process. The considerable adsorption capacity of 99.09 mg g-1 is a signifier of the suitability of the prepared adsorbent for commercial application. The findings implicated that the adsorbent can be employed in the treatment of Cr-bearing water and wastewater.

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Section: Influence Of Initial Concentrationsupporting

confidence: 91%

Section: Influence Of Contact Timementioning

confidence: 99%

Equilibrium and Thermodynamic Studies on Adsorption of Hexavalent Chromium from Aqueous Solution onto Low Cost Activated Carbon

Yunusa¹,

Ibrahim²

2020

IJEM

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“…The positive value of the entropy change implies the easiness of the adsorbate removal by the adsorbent and that the adsorption phenomenon is entropy-controlled rather than enthalpy-controlled (40). Similar outcome in thermodynamics has been reported for the adsorption of crystal violet using activated carbon prepared from waste active sludge (41).…”

Section: Thermodynamic Studiessupporting

confidence: 72%

Modeling and Regeneration Studies for the Removal of Crystal Violet Using Balanites aegyptiaca Seed Shell Activated Carbon

Yunusa

Usman

Ibrahim

2021

Journal of the Turkish Chemical Society Section A: Chemistry

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Activated carbon derived from Balanites aegyptiaca seed shell (ACBS) was employed to remove crystal violet (CV) from aqueous medium. The characterization of this ACBS has been conducted using analytical techniques such as SEM, EDS, and Brunauer-Emmett-Teller (BET) surface area analysis. The adsorption parameters investigated were as follows: contact time (5-120 min), temperature (303-333 K) and initial concentration (100-500 mg/L). The adsorption data were interpreted by using kinetic, isotherms and thermodynamic equations. The kinetic data matched the pseudo-second-order model well, and both external diffusion and internal diffusion influenced the adsorption of the dye onto the adsorbent. The isotherm data was in concurrence with the Freundlich model intimating the multilayer coverage of CV on the heterogeneous surface of the ACBS. The thermodynamic quantities like ∆S°, ∆H° and ∆G° were computed using Gibbs plot. The results implicated the practicability and endothermicity of the dye adsorption process. Regeneration studies show the effectiveness of CH3COOH solution in CV recovery from ACBS than distilled water, H2SO4, HCl, HNO3, and NaOH solutions. The regenerated ACBS was recycled five times and sustained an adsorption efficiency of 92.08%.

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“…Adsorption is either exclusively controlled by the rate of uptake of adsorbate on adsorbent or combination of rate [30,50,59]. Hence, the mechanism and rate of adsorption were studied for the adsorption of MO on CC, FCC and CCNC.…”

Section: Adsorption Kinetics and Mechanism Of Mo On Rh And Frhmentioning

confidence: 99%

Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

et al. 2020

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This study describes synthesis and characterization of corncob (CC), corncob nanocellulose (CCNC) and functionalized corncob (FCC) as unique adsorbents for methyl orange (MO) removal. Nanocellulose was synthesized via H 2 SO 4 hydrolysis and functionalization was achieved using H 3 PO 4 . All adsorbents were characterized by scanning electron microscopy coupled with energy dispersive X-ray and Fourier transform infra-red spectroscopy. Functionalization modified surface chemistry (disappearance of OH and appearance of PO 4 3− ), increased percentage carbon by 41.42% and produced welldeveloped pores. Nanocellulose retained intrinsic chemical properties of corncob though more porous with enhanced surface functionality prompted by more intense functional groups peaks and appearance of SO 4 2− . Maximum adsorption of MO occurred at pH 3.01, 4.11 and 2.09 for CC (54.34%), FCC (77.1%) and CCNC (96.81%) respectively. Adsorption parameters were fitted to four adsorption isotherms with Langmuir being the most appropriate to describe the adsorption process. Adsorption capacity increased from 17.86 mg g −1 in corncob to 60.82 mg g −1 in FCC and 206.67 mg g −1 in CCNC implying CCNC had the highest adsorption quality. The rate of adsorption was most accurately predicted by pseudo first order kinetics. Adsorption mechanism was governed by film diffusion with contribution from intra-particle diffusion. Adsorption process was spontaneous (− ∆G o ) at all temperatures (303-315 K), exothermic (− ∆H o ) and physical on CC (3.73 kJ mol −1 ) and CCNC (3.42 kJ mol −1 ) however it was endothermic (+ ∆H o ) and chemical on FCC (12.86 kJ mol −1 ). This study shows that CCNC is comparatively the best adsorbent with highest adsorption capacity.

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Removal of crystal violet dye by a novel adsorbent derived from waste active sludge used in wastewater treatment

Cited by 18 publications

References 25 publications

Equilibrium and Thermodynamic Studies on Adsorption of Hexavalent Chromium from Aqueous Solution onto Low Cost Activated Carbon

Equilibrium and Thermodynamic Studies on Adsorption of Hexavalent Chromium from Aqueous Solution onto Low Cost Activated Carbon

Modeling and Regeneration Studies for the Removal of Crystal Violet Using Balanites aegyptiaca Seed Shell Activated Carbon

Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

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