Adsorption of toxic crystal violet dye using coffee husks: Equilibrium, kinetics and thermodynamics study

Cheruiyot, Gilbert K.; Wanyonyi, Wycliffe Chisutia; Kiplimo, Joyce Jepkorir; Maina, Esther N.

doi:10.1016/j.sciaf.2019.e00116

Cited by 134 publications

(68 citation statements)

References 35 publications

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“…Furthermore, the percentage of the removal declined as a result of the initial increase in the concentration of CV because of the saturation of active sites on the adsorbent. Similar observations were reported by other researchers [17][18][19], which showed the increase in an absorbent dose reduces the amount of adsorbed dye per unit mass. It is because, in it, the equilibrium time is considered fast compared to what was reported before [17].…”

Section: Outcomes Of the Time For Shaking And The Startingsupporting

confidence: 91%

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

Al-Shahrani

2020

Journal of Chemistry

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The study investigates the phenomena involved in the crystal violet (CV) removal using the Khulays natural bentonite from the wastewater. The batch technique was utilized for performing the adsorption experiments. The operating systems were used for the investigation of the adsorption behaviour in the study, which included the initial CV concentration, time taken for shaking, the dosage of adsorbent, and the initial solution pH. The Freundlich isotherm framework and the Langmuir data were assessed in the experiment. The study outcome revealed that the equilibrium in the study was reached when shaking takes place for about 40 minutes. Additionally, the data of the sorption revealed that the enhancement of the CV concentration at the start mitigates the percentage of the CV removal as a result of which saturation integration in the Khulays bentonite dye occurs. The initial improvement in the solution pH led to improved CV adsorption. The data achieved at the isotherm adsorption were found adequate with the frameworks of Freundlich isotherm and Langmuir. Along with it, the model of pseudo-second-order kinetics was used to exhibit the adsorption of crystal violet with the Khulays natural bentonite. The Khulays natural bentonite adsorption of CV was demonstrated by the thermodynamic data exhibiting its spontaneous as well as endothermic nature. The study concludes that basic dyes can be effectively removed from the wastewater by the use of Khulays natural bentonite.

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Section: Outcomes Of the Time For Shaking And The Startingsupporting

confidence: 91%

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

Al-Shahrani

2020

Journal of Chemistry

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“…Thus, the adsorption systems are more suitably represented by pseudo-second-order model which is based on the assumption that the process rate determining step may be chemisorption involving valence forces through exchange or sharing of electrons between adsorbate and adsorbent. The pseudo-second-order model has been reported to well describe the adsorption of dyes and metals from aqueous solution by various researchers [38,39]…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorptive Removal of Basic Dyes and Hexavalent Chromium from Synthetic Industrial Effluent: Adsorbent Screening, Kinetic and Thermodynamic Studies

Yunusa¹,

Usman²,

Ibrahim³

2020

IJEM

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：The feasibility of utilizing an abundant agricultural waste (desert date seed shell) as an alternative lowcost adsorbent for the removal of hazardous basic dyes [crystal violet (CV) and malachite green (MG)] and hexavalent chromium [Cr(VI)] from synthetic industrial effluent was investigated. Five different adsorbents including the raw, carbonized and chemically activated carbons were prepared and screened with respect to adsorption efficiency of the chosen adsorbates. The prepared adsorbents were characterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and pH of zero point charge (pHzpc) analyses. The effects of operational variables such as solution pH, contact time and temperature on adsorption have been investigated. The removal of the adsorbates was found to be highly pH-dependent and the optimum pH was determined as 8.0 for the dyes and 2.0 for hexavalent chromium. The screening results revealed that the NaOH activated carbon (NAC) has the best adsorption characteristics with removal efficiencies of 91.10, 99.15 and 91.5 % for CV, MG and Cr(VI), respectively. The process dynamics was evaluated by pseudo-first-order and pseudosecond-order kinetic models. Experimental data have been found to be well in line with the pseudo-second-order model, suggesting therefore, a chemically-based sorption process. Negative Gibbs free energy change (∆G) values obtained from thermodynamic analysis indicated that the adsorption process was spontaneous and had a high feasibility. Positive values for enthalpy change (∆H) showed that the removal process was endothermic, implying that the amount of adsorbate adsorbed increased with increasing reaction temperatures. Additionally, positive values of entropy change (∆S) reflect the high affinity of the adsorbent material to the adsorbates. On the basis of results and their analyses, it has been established that adsorbent derived from desert date seed shell has a promising potential in environmental applications such as removing hazardous substances from industrial effluents. Through this work, it is believed that contributions are provided to the scientific investigations about the decontamination of precious water resources.

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“…For examples, Rice husk [9], pyrophyllite [13], Mangrove plant (Sonneratia apetala) leaf powder (MPLP), Mangrove plant (Sonneratia apetala) fruit powder (MPFP), Mango (Mangifera indica) leaf powder (MLP), Tamarind (Tamarindus indica) fruit shell powder (TFSP), Teak tree (Tectona grandis) bark powder (TTBP), Almond tree (Terminialia cattapa) bark powder (ATBP) [14]. Potato peels [15], clay [16], Kaolin [17], Mango stone biocomposite [2] and coffee husks [18] showed promising efficiencies for CV adsorption.…”

Section: Introductionmentioning

confidence: 99%

Batch mode for adsorption of crystal violet by cedar cone forest waste

et al. 2020

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In this work, cedar cone (CC), an abundant agricultural waste in north Algeria, was used as an adsorbent in batch mode for elimination of cationic dye crystal violet (CV) from aqueous solution. The functional groups were determined by Fourier transform infrared spectroscopy. The adsorption process was examined as the functions of adsorbent dose, contact time, initial CV concentration and solution pH. The isotherms adsorption were studied at different temperatures (289-318) K, the shape obtained was compatible with the "L-type" isotherm. The equilibrium data were fitted by Langmuir and Freundlich models, using non-linear regression method. The results show that equilibrium data were best fitted by Freundlich model, with good coefficient of correlation (R 2 = 0.991). The adsorption processes could be described by the pseudo-second order kinetic model with R 2 ≥ 0.997. The results proved that CC could be a potential abundant adsorbent for the removal of CV from aqueous solution.

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Adsorption of toxic crystal violet dye using coffee husks: Equilibrium, kinetics and thermodynamics study

Cited by 134 publications

References 35 publications

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

Adsorptive Removal of Basic Dyes and Hexavalent Chromium from Synthetic Industrial Effluent: Adsorbent Screening, Kinetic and Thermodynamic Studies

Batch mode for adsorption of crystal violet by cedar cone forest waste

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