The Characterization and Amoxicillin Adsorption Activity of Mesopore CaCO3 Microparticles Prepared Using Rape Flower Pollen

A precipitation reaction method was employed to prepare mesopore calcium carbonate (CaCO3) using rape flower pollen as the template. CaCO3 adsorbent was characterized using X-ray diffraction (XRD), scanning electronic microscopy (SEM), and Brunner−Emmet−Teller measurements (BET). The equilibrium adsorption data on amoxicillin were explained using Langmuir, Freundlich, and Temkin adsorption isotherm models. The pseudo-first order, second order, pseudo-second order, and intra-particle diffusion kinetic models were used to explore adsorption kinetics. Equilibrium adsorption of as-prepared CaCO3 was better depicted using the Langmuir adsorption model with an R2 of 0.9948. The separation factor (RL) was found to be in the range of 0 < RL < 1, indicating the favorable adsorption of amoxicillin. The adsorption capacity of mesopore CaCO3 reached 13.49 mg·g−1 in 0.2 g∙L−1 amoxicillin solution. The values of adsorption thermodynamic parameters (ΔHθ, ΔSθ, ΔGθ) were obtained. In addition, the adsorption process turned out to be endothermic and spontaneous for the CaCO3 product at 298 K, 308 K, and 318 K.

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Adsorptive removal of pentachlorophenol from aqueous solutions using powdered eggshell

Archives of Environmental Protection ◽

10.1515/aep-2017-0029 ◽

2017 ◽

Vol 43 (3) ◽

pp. 10-16 ◽

Cited By ~ 4

Author(s):

Krzysztof Kuśmierek ◽

Paulina Idźkiewicz ◽

Andrzej Świątkowski ◽

Lidia Dąbek

Keyword(s):

Aqueous Solutions ◽

Low Cost ◽

Second Order ◽

Isotherm Models ◽

Order Model ◽

Diffusion Kinetic ◽

Monolayer Adsorption ◽

Equilibrium Data ◽

Intra Particle Diffusion ◽

Pseudo Second Order

AbstractThe usefulness of untreated powdered eggshell as low-cost adsorbent for the removal of pentachlorophenol (PCP) from aqueous solutions was investigated. The most important parameters affecting the adsorption process, including the pH and ionic strength, were examined. The adsorption characteristics of PCP onto eggshell were evaluated in terms of kinetic and equilibrium parameters. The kinetic data were studied in terms of the pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using the Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. The pseudo-second order model best described the adsorption kinetics. Using the Langmuir equation, the monolayer adsorption capacity of eggshell for PCP was found to be 0.127 mg/g. The results showed that PCP can be effectively removed from aqueous solution employing eggshell as a cheap adsorbent.

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Adsorption of textile dyes on raw Tunisian clay: Equilibrium, kinetics and thermodynamics

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v11i6.857 ◽

2015 ◽

Vol 11 (6) ◽

pp. 3685-3697 ◽

Cited By ~ 1

Author(s):

Naghmouchi Nahed ◽

Nahdi Kais

Keyword(s):

Exchange Capacity ◽

Textile Dyes ◽

Second Order ◽

Bet Surface Area ◽

Isotherm Models ◽

Order Kinetic ◽

Adsorption Model ◽

Diffusion Kinetic ◽

Kinetics Of Adsorption ◽

Pseudo Second Order

Natural clay from Nabeul region (north of Tunisia) was investigated for the removal of two anionic textile dyes (RR120 and BB150) from aqueous solution. The raw clay was characterized by means of XRD, IR spectroscopic, chemical analysis, cation exchange capacity and BET surface area analysis.Adsorption studies were carried out under various parameters such as pH, contact time, initial dye concentration and temperature. The adsorption kinetic data was tested by pseudo-first order, pseudo second-order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The thermodynamic parameters (DH°, DS° and DG°) of the adsorption were also evaluated. The adsorption process was found spontaneous and endothermic in nature. The kinetics of adsorption were best described by pseudo-second order kinetic model. The Langmuir adsorption model totally agrees with the experimental data.

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Removal of Basic Orange 2 dye and Ni2+ from aqueous solutions using alkaline-modified nanoclay

Water Science & Technology ◽

10.2166/wst.2021.121 ◽

2021 ◽

Author(s):

Armin Geroeeyan ◽

Ali Niazi ◽

Elaheh Konoz

Keyword(s):

Experimental Data ◽

High Efficiency ◽

Adsorption Process ◽

Kinetic Equations ◽

Dye Adsorption ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Diffusion Kinetic ◽

Pseudo Second Order

Abstract In the present research, the removal of Basic Orange 2 (BO2) dye using alkaline-modified clay nanoparticles was studied. To characterize the adsorbent, XRD, FTIR, FESEM, EDX, BET and BJH analyses were performed. The effect of the variables influencing the dye adsorption process such as adsorbent dose, contact time, pH, stirring rate, temperature, and initial dye concentration was investigated. Furthermore, the high efficiency of Ni2+ removal indicated that it is possible to remove both dye and metal cation under the same optimum conditions. The experimental data were analyzed by Langmuir and Freundlich isotherm models. Fitting the experimental data to Langmuir isotherm indicated that the monolayer adsorption of dye occurred at homogeneous sites. Experimental data were also analyzed with pseudo-first-order, pseudo-second-order, and intra-particle diffusion kinetic equations for kinetic modeling of the dye removal process. The adsorption results indicated that the process follows a pseudo-second-order kinetic model. The thermodynamic parameters of the dye adsorption process such as enthalpy, entropy, and Gibbs free energy changes were calculated and revealed that the adsorption process was spontaneous and endothermic in nature. The results presented the high potential of the modified nanoclay as a cost-effective adsorbent for the removal of BO2 dye and Ni2+ from aqueous medium.

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Biosorption potentials of acid modified Saccharum bengalense for removal of methyl violet from aqueous solutions

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq151217054d ◽

2017 ◽

Vol 23 (3) ◽

pp. 399-409 ◽

Cited By ~ 5

Author(s):

Muhammad Din ◽

Kiran Ijaz ◽

Khalida Naseem

Keyword(s):

Experimental Data ◽

Adsorption Isotherm ◽

Aqueous Medium ◽

Methyl Violet ◽

Isotherm Models ◽

Langmuir Adsorption ◽

First Order ◽

Adsorption Isotherm Models ◽

Intra Particle Diffusion ◽

Pseudo Second Order

In the present work, Saccharum bengalense (SB) was treated with sulfuric acid to enhance its efficiency. Methyl violet (MV), a cationic dye, was removed from aqueous medium using acid modified S. bengalense (A-SB). Different parameters like adsorbent dosage, stirring speed, temperature, contact time and effect of initial concentration of dye on rate of adsorption of dye from aqueous medium was studied. Experimental data obtained from adsorption of MV was analyzed by applying pseudo first order, pseudo second order and intra-particle diffusion models and it was found that the data best follows the pseudosecond order kinetics. Thermodynamic parameters indicate that adsorption reaction was spontaneous, feasible and endothermic in nature. Different adsorption isotherm models, like Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin, were used to study the mechanism of adsorption process and experimental data was well fitted by the Langmuir adsorption isotherm.

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Study of the Digestate as an Innovative and Low-Cost Adsorbent for the Removal of Dyes in Wastewater

Processes ◽

10.3390/pr8070852 ◽

2020 ◽

Vol 8 (7) ◽

pp. 852

Author(s):

Sicong Yao ◽

Massimiliano Fabbricino ◽

Marco Race ◽

Alberto Ferraro ◽

Ludovico Pontoni ◽

...

Keyword(s):

Methylene Blue ◽

Contact Time ◽

Removal Rate ◽

Low Cost ◽

Second Order ◽

Isotherm Models ◽

Batch Adsorption ◽

Order Kinetic ◽

Diffusion Kinetic ◽

Pseudo Second Order

Digestate, as an urban solid waste, was considered as an innovative adsorbent for colorant polluted wastewater. Batch adsorption experiments were carried out using digestate as an adsorbent material to remove various dyes belonging to different categories. The removal rate and adsorption capacity of dyes were evaluated and the dose of digestate, contact time, and initial dye concentration were studied. The maximum removal rate was approximately 96% for Methylene Blue. The equilibrium time for the Methylene Blue was 4 h, while for other dyes, a longer contact time was required to reach the equilibrium. The suspicion of colloidal matter release into the solution from solid fraction of the digestate led to the investigation of the consequence of a washing step of the digestate adsorbent upstream the adsorption experiment. Washed and not washed adsorbents were tested and the differences between them in terms of dye removal were compared. Moreover, experimental data were fitted by pseudo-first order, pseudo-second order, and intra-partial diffusion kinetic models as well as Langmuir, Freundlich, and Sips isotherm models. The results from fitted models showed that the adsorption of various dyes onto the digestate was mostly well fitted by the Langmuir isotherm and pseudo-second-order kinetic model.

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Chromium (VI) adsorption onto activated sulfate lignin

Water Practice & Technology ◽

10.2166/wpt.2009.038 ◽

2009 ◽

Vol 4 (2) ◽

Cited By ~ 8

Author(s):

Nassima Tazrouti ◽

Moussa Amrani

Keyword(s):

Adsorption Capacity ◽

Contact Time ◽

Analytical Data ◽

Order Equation ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Adsorption Model ◽

Chromium Vi ◽

Pseudo Second Order

Activated lignin having surface area of 1023 m2.g-1 has been prepared from sulfate lignin that was treated by 30 % H2O2 and carbonized at 300 °C in order to test the chromium (VI) adsorption from aqueous solution. The influence of contact time, pH, initial concentration of adsorbent and adsorbate and temperature on the adsorption capacity were investigated. The maximum removal of Cr(VI) was found to be 92,36 % at pH=2 and contact time of 80 min. Optimal concentration of lignin and Cr(VI) were found to be 3.8 g.l-1 and 180 mg.l-1, respectively. The adsorption kinetics was tested pseudo-first-order and pseudo-second-order equation. The analytical data were fitted well in a pseudo-second-order equation and the rate of removal of chromium was found to speed up with increasing temperature. Activation energy for the adsorption process was found to be 18.19 Kj.mol-1. The Langmuir and Freundlich adsorption isotherm models were applied to describe the isotherm and isotherm constants for the adsorption of Cr (VI) on lignin. These constants and correlation coefficients of the isotherm models were calculated and compared. Results indicated that Cr (VI) uptake could be described by the Langmuir adsorption model. The maximum adsorption capacity (qm) of Cr (VI) on lignin was 75.75 mg.g-1 at temperature of 40°C. The dimensionless equilibrium parameter (RL) signified a favorable adsorption of Cr (VI) on lignin and was found between 0.0601 and 0.818 (0<RL<1). The thermodynamic parameters like ΔG°, ΔS° and ΔH° were calculated and it has been found that the reaction was spontaneous and endothermic in nature. This study indicates that lignin has the potential to become an effective and economical adsorbent for removal Cr (VI) from the waste water.

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Thermodynamics of Biosorption for Removal of Co(II) Ions by an Efficient and Ecofriendly Biosorbent (Saccharum bengalense): Kinetics and Isotherm Modeling

Journal of Chemistry ◽

10.1155/2013/528542 ◽

2013 ◽

Vol 2013 ◽

pp. 1-11 ◽

Cited By ~ 10

Author(s):

Muhammad Imran Din ◽

Muhammad Latif Mirza ◽

Sadia Ata ◽

Makshoof Athar ◽

Ijaz Ul Mohsin

Keyword(s):

Low Cost ◽

Research Work ◽

Activation Parameters ◽

Entropy Change ◽

Second Order ◽

Isotherm Models ◽

Adsorption Isotherm Models ◽

Pseudo Second Order ◽

Adsorption Of Co ◽

Langmuir And Freundlich Models

In this research work, a low-cost biomass derived from the pulp ofSaccharum bengalense(SB) was used as an adsorbent material/biosorbent for the removal of Co(II) ions from aqueous solution. Langmuir, Freundlich Timken, and Dubinin-Radushkevich (D-R) adsorption isotherms have been applied to further define the mechanism of sorption. From the comparison of different adsorption isotherm models, it was found that biosorption of Co(II) by SB followed Langmuir and Freundlich models. The sorption capacity for cobalt ofSaccharum bengalensewas ( mg/g) at 323K. A comparison of kinetic models applied to the adsorption of Co(II) ontoSaccharum bengalensewas evaluated for the pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion and Bangham's kinetics models. It was found that the pseudo-second-order mechanism is predominant. Activation parameters evaluated from thermodynamics and kinetic parameters such as free energy change , kJ/mol), enthalpy change , kJ/mol), and entropy change , kJ/mol) revealed the spontaneous, endothermic, and feasible nature of adsorption process. The results of the present investigation suggested thatSaccharum bengalense(SB) can be used as an environmentally and economically feasible biosorbent for the removal of Co(II) from aqueous solutions.

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Novel, Environment-Friendly Cellulose-Based Derivatives for Tetraconazole Removal from Aqueous Solution

Polymers ◽

10.3390/polym13030450 ◽

2021 ◽

Vol 13 (3) ◽

pp. 450

Author(s):

Bayan Khalaf ◽

Othman Hamed ◽

Shehdeh Jodeh ◽

Ghadir Hanbali ◽

Roland Bol ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Isotherm ◽

Second Order ◽

Order Kinetic ◽

Adsorption Model ◽

Adsorption Enthalpy ◽

Environment Friendly ◽

Carbonyl Chloride ◽

Intra Particle Diffusion ◽

Pseudo Second Order

In this study, cellulose-based derivatives with heterocyclic moieties were synthesized by reacting cellulose with furan-2-carbonyl chloride (Cell-F) and pyridine-2,6-dicarbonyl dichloride (Cell-P). The derivatives were evaluated as adsorbents for the pesticide tetraconazole from aqueous solution. The prepared adsorbents were characterized by SEM, TGA, IR, and H1 NMR instruments. To maximize the adsorption efficiency of tetraconazole, the optimum conditions of contact time, pH, temperature, adsorbent dose, and initial concentration of adsorbate were determined. The highest removal percentage of tetraconazole from water was 98.51% and 95% using Cell-F and Cell-P, respectively. Underivatized nanocellulose was also evaluated as an adsorbent for tetraconazole for comparison purpose, and it showed a removal efficiency of about 91.73%. The best equilibrium adsorption isotherm model of each process was investigated based on the experimental and calculated R2 values of Freundlich and Langmuir models. The adsorption kinetics were also investigated using pseudo-first-order, pseudo-second-order, and intra-particle-diffusion adsorption kinetic models. The Van’t Hoff plot was also studied for each adsorption to determine the changes in adsorption enthalpy (∆H), Gibbs free energy (∆G), and entropy (∆S). The obtained results showed that adsorption by Cell-F and Cell-P follow the Langmuir adsorption isotherm and the mechanism follows the pseudo-second-order kinetic adsorption model. The obtained negative values of the thermodynamic parameter ∆G (−4.693, −4.792, −5.549 kJ) for nanocellulose, Cell-F, and Cell-P, respectively, indicate a spontaneous adsorption process. Cell-F and Cell-P could be promising absorbents on a commercial scale for tetraconazole and other pesticides.

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Synthesis of Specific ZnF Based Nanoparticles (ZnFe2O4): Antimicrobial Properties, Surface Characteristics, and Adsorption Activity for AB 29 Textile Dye

Journal of Nanotechnology ◽

10.1155/2020/3139701 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Ferda Gönen ◽

Gökhan Tekinerdoğan

Keyword(s):

Kinetic Model ◽

Kinetic Data ◽

Second Order ◽

Color Removal ◽

Isotherm Models ◽

Textile Dye ◽

Order Kinetic ◽

Adsorption Activity ◽

Order Kinetic Model ◽

Pseudo Second Order

In this investigation, the color removal from synthetic wastewaters containing Acid Blue 29 (AB 29) dye was investigated by ZnF-based nanomaterials (ZnFe2O4) synthesized by the coprecipitation method in a batch system. SEM, FT–IR, and XRD analysis were used for the characterization of the nanoparticles (before and after adsorption), and the analysis results were compared with each other. The parameters such as pH, temperature, dye concentration, and nanoparticle dosage affecting color removal were examined systematically, and favorable color removal conditions were determined by the classical approach. From the experimental results, the favorable conditions with high removal efficiency for the adsorption were determined: removal temperature 35°C and the removal pH 2.0. At these experimental conditions, the adsorbed dye amount per unit mass of adsorbent and the percentage dye removal were determined as 1489.79 mg·g−1 and 98.83%, respectively. In the other part of the research, three different isotherm models (Langmuir, Freundlich, and Temkin) were used to examine the adsorption equilibrium data. Langmuir and especially Freundlich linear isotherm models provided the highest R2 regression coefficients, successfully. The kinetic data was evaluated by pseudo-first-order and pseudo-second-order kinetic model approach. It was observed that pseudo-second-order kinetic model best represented AB 29-ZnF adsorption kinetic data. The determined thermodynamic parameters such as ΔH, ΔS, and ΔG were proved that the AB 29-ZnF adsorption system was an exothermic (ΔH < 0), spontaneous, thermodynamically favorable (ΔG < 0), and stabilized system without any structural changes in sorbate and sorbents (ΔS<0).

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Evaluation of the possible use of a Bulgarian clinoptilolite for removing strontium from water media

Clay Minerals ◽

10.1180/claymin.2015.050.1.06 ◽

2015 ◽

Vol 50 (1) ◽

pp. 55-64 ◽

Cited By ~ 4

Author(s):

N. Lihareva ◽

O. Petrov ◽

Y. Tzvetanova ◽

M. Kadiyski ◽

V.A. Nikashina

Keyword(s):

Second Order ◽

Isotherm Models ◽

Sorption Data ◽

Water Media ◽

Effects Of Ph ◽

Equilibrium Data ◽

Intra Particle Diffusion ◽

Pseudo Second Order ◽

Na Ions ◽

Natural Clinoptilolite

AbstractThe sorption of Sr2+ ions by natural clinoptilolite was investigated using the batch method. The effects of pH, contact time and strontium concentrations were tested and the optimal conditions for sorption were determined. The process was very fast initially and equilibrium was reached within 24 h. Kinetic sorption data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion models. The simple pseudo-second-order rate model provides good agreement with the experimental data for Sr2+ uptake. The respective rate constants, k2, calculated at different initial Sr2+ concentrations, were obtained. The equilibrium data were analysed by applying the Langmuir, Freundlich and Dubinin–Raduchkevich isotherm models. The Langmuir model describes the observed Sr2+ uptake most accurately and the value of the monolayer sorption capacity is 32.81 mg Sr2+/g. The effect of Na+ ions and the effectiveness of uptake from low saline groundwater simulated solutions were also studied and discussed.

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