Malachite green adsorption onto modified pine cone: Isotherms, kinetics and thermodynamics mechanism

Kavcı, Erbil

doi:10.1080/00986445.2020.1715961

Cited by 37 publications

(5 citation statements)

References 53 publications

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“…2g). Similar results have been reported for the adsorption of MG by rice husk, pine cone, and Catha edulis stem (Chowdhury et al 2011;Abate et al 2020;Kavci 2021). MG is a cationic dye and the number of negatively charged sites on the adsorbent increases with pH, resulting in further enhancement of the electrostatic interaction between the cationic MG molecules and the tea stalk.…”

Section: The Effect Of Ph Of the Solutionsupporting

confidence: 85%

Adsorption of malachite green from aqueous phase by tea stalk powder: Parameters, kinetic, isothermal, and thermodynamic studies

Liu

Zhao

et al. 2023

BioRes

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Decolorization of malachite green (MG) from the aqueous phase was investigated using tea stalk powder. The adsorption efficiency decreased with the initial MG concentration, ionic strength of the solution, and heavy metal content. A suitable initial MG concentration of up to 200 mg/L can be accepted because adsorption efficiency of more than 95% is achieved. Various adsorption kinetic models were used to fit the experimental data, and the data obtained was best explained by the pseudo second-order model. The adsorption capacities calculated with the pseudo second-order model at different initial MG concentrations ranging from 24.27 to 158.7 mg/g were very close to the experimental data. The Langmuir isotherm fitted well, and the thermodynamic investigation showed that the adsorption of MG by tea stalk powder was feasible, endothermic, and spontaneous. The regeneration/adsorption experiments indicated that the tea stalk powder remained more than 95% of efficiency after six cycles using NaOH as desorbent and thus could be used many times. In conclusion, tea stalk has considerable potential as a cost-effective adsorbent for the removal of MG.

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Section: The Effect Of Ph Of the Solutionsupporting

confidence: 85%

Adsorption of malachite green from aqueous phase by tea stalk powder: Parameters, kinetic, isothermal, and thermodynamic studies

Liu

Zhao

et al. 2023

BioRes

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show abstract

“…If a molecule has an affinity for activated carbon, it will be attracted to the adsorbent through different mechanisms (physisorption, chemisorption or both), until it reaches equilibrium. Adsorption isotherms are indicators that provide information on the adsorption capacity and the relationship of the adsorbent with the adsorbate [ 29 , 30 ]—in this case, how activated carbon works by adsorbing contaminants from the leachate.…”

Section: Resultsmentioning

confidence: 99%

Selection of the Activated Carbon Type for the Treatment of Landfill Leachate by Fenton-Adsorption Process

et al. 2020

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Sanitary landfill leachates usually have characteristics that depend on the region where they are generated and according to the age of the landfill, which is why a unique treatment for their sanitation has not been found. However, the adsorption preceded by the Fenton process has been proven to be highly efficient at removing contaminants. In this study, the adsorptive capacity of two types of activated carbon, granular and powdered, was analyzed to determine which was more efficient in the adsorption stage in the Fenton-adsorption process. Likewise, its behavior was analyzed using three isotherm models (Langmuir, Freundlich and Temkin), testing the raw leachate and the Fenton-treated one with both carbons. The adsorption that is carried out on the carbons is better adjusted to the Freundlich and Temkin models. It concludes that multilayers, through the physical adsorption, carry out the adsorption of pollutants on the surface of the carbons. The results show that, statistically, granular activated carbon is more efficient at removing chemical oxygen demand (COD), and powdered activated carbon removes color better. Finally, an adsorption column was designed for the Fenton-adsorption process that was able to remove 21.68 kgCOD/kg carbon. Removal efficiencies for color and COD were >99%.

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“…As shown in the Figure 4 that percentage of CR removal remained steady until pH 7, but then declined. According to the results, the highest CR removal was found to be 99.04% at pH 7 [36].…”

Section: Effect Of Ph On Adsorptionmentioning

confidence: 95%

Removal of Congo Red From Water By Adsorption Onto Chitosan-BN-Fe2O3: Kinetic and Isotherm Studies

Bingöl

2022

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Dünyada artan teknoloji ile birlikte atıklar ciddi bir problem haline gelmiştir. Bu atıklardan en önemlilerinden olan atık boyar maddeler, çevre için önemli zararlar vermektedir. Bunların giderimi ile ilgili çalışmalar artmıştır. Bu çalışmada da Kongo red giderimi için Kitosana Boron Nitride- Fe2O3 katkılanıp adsorbent hazırlanmıştır. Bu adsorbentin (Ch-BN-Fe2O3) kimyasal yapıları FT-IR analizi ile doğrulanmıştır. Adsorpsiyon çalışmalarında adsorbent kütleleri, pH, temas süresi congo red giderimi üzerine etkileri araştırılmıştır. Buna göre 0,1 gram adsorbent kütlesi, pH 7, 60 dk sürede en yüksek %99,58 giderim gerçekleşmiştir. Ayrıca çalışmada termodinamik, izoterm ve kinetik çalışmalar gerçekleşmiştir. İzoterm çalışmalarında en uygun modelin langmuir olduğu belirlenmiş ve qmax değeri de 86,95 mg/g bulunmuştur. Bununla birlikte pseudo second order kinetic modeli uygun olduğu tespit edilmiştir

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Malachite green adsorption onto modified pine cone: Isotherms, kinetics and thermodynamics mechanism

Cited by 37 publications

References 53 publications

Adsorption of malachite green from aqueous phase by tea stalk powder: Parameters, kinetic, isothermal, and thermodynamic studies

Adsorption of malachite green from aqueous phase by tea stalk powder: Parameters, kinetic, isothermal, and thermodynamic studies

Selection of the Activated Carbon Type for the Treatment of Landfill Leachate by Fenton-Adsorption Process

Removal of Congo Red From Water By Adsorption Onto Chitosan-BN-Fe2O3: Kinetic and Isotherm Studies

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