Equilibrium, Kinetic, and Thermodynamic Studies of Cationic Dyes Adsorption on Corn Stalks Modified by Citric Acid

Soldatkina, L. M.; Yanar, Marianna

doi:10.3390/colloids5040052

Cited by 30 publications

(11 citation statements)

References 30 publications

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“…Figure 14 shows the desorption efficiency values for the three regenerating agents used. The very low desorption percent in distilled water shows that the adsorption is not dominated by weak bonds [ 93 ]. The desorption results obtained using HCl and NaOH indicate that ion exchange may be involved in adsorption but it doesn’t have a very significant role and other strong forces intervene in process [ 94 , 95 , 96 ].…”

Section: Resultsmentioning

confidence: 99%

The Use of Bilberry Leaves (Vaccinium myrtillus L.) as an Efficient Adsorbent for Cationic Dye Removal from Aqueous Solutions

et al. 2022

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In this study, a new lignocellulosic bioadsorbent, bilberry (Vaccinium myrtillus L.) leaves powder, was used to remove the methylene blue dye from aqueous solutions. The characterization of the adsorbent was performed by FTIR, SEM and color analysis. The influence of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on the adsorption process were followed. Equilibrium, kinetic, and thermodynamic studies were conducted in order to understand the adsorption process mechanism. Process optimization was performed using the Taguchi method. Sips isotherm and general order kinetic model characterize the adsorption process. The maximum adsorption capacity, 200.4 (mg g−1), was better compared with other similar bioadsorbents. Thermodynamic parameters indicated that the adsorption process is spontaneous, favorable and endothermic and also that physisorption is involved in the process. The factor with the highest influence on the dye removal process was pH, followed by contact time, temperature, adsorbent dose, ionic strength and initial dye concentration. The obtained results revealed that the bioadsorbent material based on bilberry (Vaccinium myrtillus L.) leaves is highly efficient for cationic dyes removal from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

The Use of Bilberry Leaves (Vaccinium myrtillus L.) as an Efficient Adsorbent for Cationic Dye Removal from Aqueous Solutions

et al. 2022

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“…After that, a Van't Hoff curve can be constructed, which is a plot of ln(K e ) to 1/T. The values of ΔH° (standard enthalpy change) and ΔS° (standard entropy change) can be identified based on the slope and intercept of the Van't Hoff curve [25,27].…”

Section: Particle Size Effect On Adsorption Thermodynamics Testmentioning

confidence: 99%

Effect of Activated Carbon Particle Size on Methylene Blue Adsorption Process in Textile Wastewater

2023

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Up to 60–70% of the total textile dyes produced are azo dyes. An example of azo dye is methylene blue, which is commonly used in dyeing wool, silk, and cotton. This substance possessed harmful effects on the environment. Therefore, the removal process is mandatory. The adsorption process is a common method for dye removal in wastewater. One innovation to increase adsorption efficiency even further is by reducing adsorbent particle size. To understand the effect of adsorbent particle size on the adsorption process, in this study, granular activated carbon (GAC) was pulverized into powder (PAC) and superfine powder (SPAC). Adsorbent characterizations, isotherm, kinetics, and thermodynamics tests were conducted. Based on this study, surface area, pore volume, and adsorption capacity were increased for smaller adsorbent particle sizes. Isotherm and kinetic analysis showed that there was no difference in the isotherm and kinetic models that applied to each activated carbon, but there was an increase in the isotherm and kinetic coefficient values at smaller particle sizes. Meanwhile, based on the thermodynamic test, there were differences in the dominant adsorption mechanism for each activated carbon. In GAC and SPAC, the dominant adsorption mechanism was electrostatic interactions, while in PAC was van der Waals forces.

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“…Chemical modification with various chemicals alters the structure and the surface properties of adsorbents, allows one improving their adsorption performance [1,2]. Generally, native straw of cereal plants as an adsorbent has the low adsorption capacity and its modification using citric acid increases of carboxyl groups in lignocellulosic materials and is efficient, economical, environmentally friendly, and easily produced [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, for novel adsorbents' introduction, the adsorption studies of kinetics, isotherms and thermodynamics are essential in supplying the basic information required for the design and operation of adsorption equipment for wastewater treatment. Concluding from the literature [9][10][11][12][13][14][15][16][17], the kinetics, equilibrium, and thermodynamics of cationic dyes adsorption on citric acid modified wheat straw [9,10], citric acid modified corn straw [11,12] as well as on citric acid modified rice straw [13][14][15] is well understood. In this paper, the focus of the study was to investigate kinetic, equilibrium, and thermodynamic aspects in order to evaluation cationic dyes (methylene blue and malachite green) adsorption efficiency on citric acid modified barley straw because these issues have not yet been examined [17].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of cationic dyes on barley straw modified by citric acid: kinetic, equilibrium, and thermodynamic studies

Soldatkina¹,

Yanar²

2022

Him. Fiz. Tehnol. Poverhni

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The adsorption performance of cationic dyes (methylene blue and malachite green) on barley straw modified by citric acid has been studied. Barley straw modified by citric acid is a low-cost and eco-friendly adsorbent, however the effectiveness of the adsorbent towards cationic dyes have not yet been examined. Accordingly, kinetic, equilibrium, and thermodynamic aspects of the cationic dyes adsorption from aqueous solution were studied in order to evaluate the citric acid modified barley straw efficiency. The modified barley straw was characterized versus unmodified matter using Fourier Transform Infrared spectroscopy (FT-IR). FT-IR analysis showed that modification of barley straw using citric acid allowed us to increase the number of carboxyl groups on the straw surface. Adsorption studies were conducted on a batch process, to study the effects of contact time, concentration of cationic dyes, and temperature. The results of kinetic experiments showed that adsorption process attained equilibrium within 120 and 90 min for methylene blue and malachite green, respectively, and equilibrium time for both the cationic dyes was temperature independent. The adsorption kinetics of the cationic dyes was well described by the pseudo-second order model. The equilibrium data are analyzed by the Freundlich, Langmuir, and Temkin isotherms. The experimental data of adsorption indicated more conformity with the Langmuir isotherm model for methylene blue and malachite green adsorption on the modified straw. Furthermore, the thermodynamic parameters calculated at 293–333 K showed that the adsorption of methylene blue and malachite green on the modified straw was endothermic. Negative results of ∆Go-values (between −32.1 and −24.6 kJ mol−1) indicated that the adsorption process was spontaneous at all the tested temperatures. Desorption of methylene blue and malachite green from the exhausted adsorbent was estimated using water and aqueous solutions of hydrochloric and acetic acids. Desorption efficiency follows the order: HCl > CH3COOH > H2O. The study has revealed that citric acid modified barley straw is an effective adsorbent and can be used as an alternative for more costly adsorbents used for cationic dyes removal from wastewater.

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Equilibrium, Kinetic, and Thermodynamic Studies of Cationic Dyes Adsorption on Corn Stalks Modified by Citric Acid

Cited by 30 publications

References 30 publications

The Use of Bilberry Leaves (Vaccinium myrtillus L.) as an Efficient Adsorbent for Cationic Dye Removal from Aqueous Solutions

The Use of Bilberry Leaves (Vaccinium myrtillus L.) as an Efficient Adsorbent for Cationic Dye Removal from Aqueous Solutions

Effect of Activated Carbon Particle Size on Methylene Blue Adsorption Process in Textile Wastewater

Adsorption of cationic dyes on barley straw modified by citric acid: kinetic, equilibrium, and thermodynamic studies

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