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

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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High Efficiency of Natural Safiot Clay to Remove Industrial Dyes from Aqueous Media: Kinetic, Isotherm Adsorption and Thermodynamic Studies

Biointerface Research in Applied Chemistry ◽

10.33263/briac115.1271712731 ◽

2021 ◽

Vol 11 (5) ◽

pp. 12717-12731

Keyword(s):

High Efficiency ◽

Aqueous Media ◽

Kinetic Equations ◽

Experimental Tests ◽

Batch Process ◽

Second Order ◽

Synthetic Wastewater ◽

Isotherm Models ◽

Order Kinetic ◽

Pseudo Second Order

This study's objective was to demonstrate the potential of Natural Safiot Clay (NSC) for removing cationic dyes MB and Safranin from synthetic wastewater. The operation parameters investigated included initial concentrations, adsorbent dose, initial pH, and temperature. Experimental tests were conducted in a batch process. The experimental isotherms data were analyzed using Langmuir, Freundlich, and Dubinin–Radushkevich isotherm models. The Langmuir model obtained the best fit with a maximum monolayer adsorption capacity of 68.49 mg/g for MB and 45.45 mg/g for safranin. Pseudo-first-order, pseudo-second-order kinetic equations, and intraparticle diffusion models were used to examine the experimental data at different initial concentrations. It was found that the pseudo-second-order kinetic model described the data of dyes adsorption on NSC adsorbent very well. Thermodynamic adsorption processes were found to be spontaneous, exothermic, and physical reactions. The natural safiot clay was characterized using the following technique: DRX, XRF, SEM, EDX, and FT-IR.

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Prediction of adsorption efficiency for the removal malachite green and acid blue 161 dyes by marble sludge dust using ANN

Global NEST Journal ◽

10.30955/gnj.001366 ◽

2014 ◽

Vol 16 (4) ◽

pp. 676-689 ◽

Cited By ~ 6

Keyword(s):

Experimental Data ◽

Malachite Green ◽

Second Order ◽

Isotherm Models ◽

Batch Adsorption ◽

Order Kinetic ◽

Ann Model ◽

Marble Dust ◽

Pseudo Second Order ◽

Acid Blue

<div> In the present study, batch adsorption studies were performed for the removal of malachite green and acid blue 161 dyes from aqueous solutions by varying parameters such as contact time, waste marble dust amount, initial dye concentration and temperature. The equilibrium adsorption data were analyzed by Langmuir, Freundlich and Temkin adsorption isotherm models. The Langmuir and Freundlich adsorption models agree well with experimental data. The pseudo-second order, intraparticle intraparticle diffusion and Elovich kinetic models were applied to the experimental data in order to describe the removal mechanism of dye ions by waste marble dust. The pseudo-second order kinetic was the best fit kinetic model for the experimental data. Thermodynamics parameters such as ΔG, ΔH and ΔS were also calculated for the adsorption processes. The experimental data were used to construct an artificial neural network (ANN) model to predict removal of malachite green and acid blue 161 dyes by waste marble dust. A three-layer ANN, an input layer with four neurons, a hidden layer with 12 neurons, and an output layer with one neuron is constructed. Different training algorithms were tested on the model to obtain the proper weights and bias values for ANN model. The results show that waste marble dust is an efficient sorbent for malachite green dye and ANN network, which is easy to implement and is able to model the batch experimental system. </div>

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A Study of The Equilibrium, Kinetics, and Thermodynamics of Malachite Green Dye Adsorption Onto Lignin

10.21203/rs.3.rs-1009760/v1 ◽

2021 ◽

Author(s):

Vani Gandham ◽

UMA Addepally ◽

Bala Narsaiah T

Keyword(s):

Malachite Green ◽

Group Analysis ◽

Dye Adsorption ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adequate Treatment ◽

Pseudo Second Order ◽

Kinetics And Isotherms

Abstract Malachite Green (MG), a cationic synthetic dye is considered hazardous when discharged into the water bodies without any adequate treatment. It can affect the multiple segments of the environment leading to irreversible persistent changes. So, there is a need for remediation with cost-effective method to remove dyes from effluents. Adsorption is one such technique to remove dyes from wastewater and is effective and economical. The present study describes the removal of MG cationic dye from wastewater using eco-friendly and biodegradable lignin extracted from hydrothermally treated rice straw by adsorption process. Functional group analysis and morphological characterisation was done to the extracted lignin after quantification. The maximum percent removal of MG 92 ± 0.2 % was observed from a series of batch experiments at optimum process parameters of: contact time 80 min, initial dye concentration 50 ppm, lignin dosage 0.25g, pH 7, temperature 300c and with 100 rpm agitation speed. The adsorption kinetics and isotherms were determined for the experimental data using four kinetic models (pseudo-first-order, second order, pseudo-second-order and intra-particle diffusion model) and two isotherm models (Langmuir and Freundlich). The results suggested that the kinetics data fit to the pseudo-second-order kinetic model with the maximum adsorption capacity 36.7 mg/g and the two isotherm models were applicable for the adsorption of MG onto the lignin. Additionally, the thermodynamic parameters ΔSo, ΔHo and ΔGo were evaluated. Therefore, lignin which is an environmental friendly and low cost carbon material that can be used as an adsorbent for dye removal.

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Fabrication of Amino Functionalized Magnetic Expanded Graphite Nanohybrids for Application in Removal of Ag(I) from Aqueous Solution

Journal of Nanomaterials ◽

10.1155/2017/6839474 ◽

2017 ◽

Vol 2017 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Ying-Xia Ma ◽

Yong-Xin Ruan ◽

Dan Xing ◽

Xue-Yan Du ◽

Pei-Qing La

Keyword(s):

Experimental Data ◽

Aqueous Solution ◽

Photoelectron Spectroscopy ◽

Expanded Graphite ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

One Pot ◽

X Ray ◽

Pseudo Second Order

Ethylenediamine functionalized magnetic expanded graphite decorated with Fe3O4 nanoparticles (MEG-NH2) was fabricated by one-pot solvothermal method. The as-prepared MEG-NH2 nanohybrids were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Zeta potential analyzer. The effects of Fe3O4 content in MEG-NH2 nanohybrids, pH, initial concentration, contact time, and dosage on adsorption properties of the MEG-NH2 nanohybrids for Ag(I) from aqueous solution were investigated by batch experiments. The pseudo-first-order and the pseudo-second-order kinetic models were utilized to study adsorption kinetics. The experimental data was also analyzed with Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models. The results show that Ag(I) was reduced to silver in the process of the adsorption by MEG-NH2 nanohybrids; the experimental data was better fitted to pseudo-second-order model and Langmuir isotherm model which revealed that the adsorption process was a chemical adsorption by the formation of silver on the surface of MEG-NH2 nanohybrids.

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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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Adsorption and dyeing properties of acid dyes on fine denier silk fibers

Textile Research Journal ◽

10.1177/0040517519869389 ◽

2019 ◽

Vol 90 (3-4) ◽

pp. 433-441

Author(s):

Sheng Sun ◽

Yuansong Zhang ◽

Yushan Zou ◽

Fangyin Dai ◽

Shixiong Yi

Keyword(s):

Kinetic Equations ◽

Dye Adsorption ◽

Second Order ◽

Silk Fiber ◽

Order Kinetic ◽

Order Model ◽

Dyeing Property ◽

Silk Fibers ◽

Ph Values ◽

Pseudo Second Order

In this work, the surface morphology and diameter distribution of fine denier silk fiber were observed and measured. The adsorption property of acid orange 7 on the fine denier silk fiber was studied. The pseudo-first-order model and pseudo-second-order model adsorption kinetic models were employed to evaluate the experimental data. The effects of pH values and reaction temperature on the dyeing property were investigated. The results indicated that the fine denier silk fiber exhibited a uniform fiber diameter (9 µm), which is smaller than that of conventional silk fiber (16 µm). The adsorption process of the dye could be described using pseudo-second-order kinetic equations. A higher the amount of dye adsorption at equilibrium and faster adsorption rate was obtained for the fine denier silk fiber. The color strength of fine denier silk fibers was improved for the decreased pH values and increased temperature, which exhibited an excellent dyeing property.

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ADSORPTION CHARACTERISTICS OF ZIZYPHUS JUJUBA SEED SHELL ACTIVATED NANO POROUS CARBON FOR REMOVING COPPER (II) IONS FROM WASTEWATER

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v4.i12.2016.2412 ◽

2016 ◽

Vol 4 (12) ◽

pp. 226-241

Author(s):

K Veeravelan ◽

S Arivoli ◽

V Marimuthu

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Solution Ph ◽

Batch Mode ◽

Zizyphus Jujuba ◽

Pseudo Second Order ◽

Nano Carbon

In the present study, adsorption of copper (II) ions from aqueous solution by Activated Zizyphus Jujuba shell Nano Carbon was investigated under batch mode. The influence of solution pH, sorbent dose, copper concentration, contact time and temperature was studied. The copper adsorption was favored with maximum adsorption at pH 6.5. Sorption equilibrium time was observed in 60 min. The equilibrium adsorption data were correlated with Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Hurkins-Jura, Halsay, Radlich-Peterson, Jovanovic and BET isotherm models. The kinetics of the adsorption process was tested by pseudo-first-order, pseudo-second order, Elovich and Intra-particle diffusion models. It was shown that adsorption of copper could be described by the pseudo-second order kinetic model. Thermodynamic parameters such as Gibbs free energy (ΔG0), the enthalpy (ΔH0) and the entropy change of sorption (ΔS0) have also been evaluated and it has been found that the adsorption process was spontaneous, feasible and endothermic in nature. The results indicated that Activated Zizyphus Jujuba shell Nano Carbon can be used as an effective and low-cost adsorbent to remove copper (II) from aqueous solution.

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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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Adsorption of Chromium Ions on Activated Carbon Produced from Cow Bones

Iraqi Journal of Chemical and Petroleum Engineering ◽

10.31699/ijcpe.2019.2.4 ◽

2019 ◽

Vol 20 (2) ◽

pp. 23-32

Author(s):

Marah Waleed Khalid ◽

Sami D. Salman

Keyword(s):

Surface Area ◽

Kinetic Equations ◽

Freundlich Isotherm ◽

Second Order ◽

Raw Material ◽

Isotherm Models ◽

Order Kinetic ◽

Solution Ph ◽

Chromium Ions ◽

Pseudo Second Order

Due to the broad range uses of chromium for industrial purposes, besides its carcinogenic effect, an efficient, cost effective removal method should be obtained. In this study, cow bones as a cheap raw material were utilized to produce active carbon (CBAC) by physiochemical activation, which was characterized using: SEM to investigate surface morphology and BET to estimate the specific surface area. The best surface area of CBAC was 595.9 m2/gm which was prepared at 600 ᵒC activation temperature and impregnation ratio of 1:1.5. CBAC was used in aqueous chromium ions adsorption. The investigated factors and their ranges are: initial concentration (10-50 mg/L), adsorption time (30-300 min), temperature (20-50 ᵒC) and solution pH (2-11). Isotherm of adsorption and its kinetics were studied. The adsorption process was modeled statistically and was represented by an empirical model. Equilibrium data were fitted to the Langmuir and Freundlich isotherm models and the data best represented by Freundlich isotherm. Pseudo- first order and pseudo- second order kinetic equations were utilized to study adsorption kinetics, where chromium adsorption on CBAC fitted pseudo- second order fitted the data more adequately. The best removal efficiency was found to be 94.32%.

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Removal of cationic dye (basic red 18) from aqueous solution using natural turkish clay

Global NEST Journal ◽

10.30955/gnj.000944 ◽

2013 ◽

Vol 15 (4) ◽

pp. 529-541 ◽

Cited By ~ 12

Keyword(s):

Experimental Data ◽

Ionic Strength ◽

Initial Conditions ◽

Kinetic Equations ◽

Agitation Speed ◽

Second Order ◽

Order Kinetic ◽

Cationic Dye ◽

Adsorbent Dosage ◽

Pseudo Second Order

In this study, the removal of a cationic dye, basic red 18, used in the textile industry with montmorillonite was investigated as a function of initial dye concentration, pH, agitation speed, adsorbent dosage, ionic strength, and temperature. Adsorption process was attained to the equilibrium within 30 minutes. The adsorption capacity of basic red 18 increased with increasing ionic strength, initial dye concentration, pH, agitation speed, and temperature, but decreased with increasing adsorbent dosage. The experimental data were analyzed by Langmuir, Freundlich, Temkin, Elovich and Dubinin-Radushkevich isotherms, and it was found that the isotherm data were reasonably correlated by Freundlich isotherm. Pseudo-first order, pseudo-second order, Elovich kinetic equations and intraparticle diffusion model were used to examine the experimental data of different initial conditions. It was found that the pseudo-second order kinetic equation described the data of dye adsorption onto montmorillonite very well. Furthermore, for the removal of basic red 18, a semi-empirical model was established. Thermodynamic analysis was carried out for basic red 18 onto montmorillonite. It was found that the adsorption processes were endothermic in nature. The values of Ea, ΔH*, ΔS* and ΔG* at 293 K for basic red 18 adsorption on clay were calculated as 27.635 kJ mol-1, 25.041kJ mol-1, -0.090 kJ mol-1 K-1 and 51.412 kJ mol-1, respectively. The results indicated that montmorillonite could be employed as an alternative to commercial adsorbents in wastewater treatment for the removal of color and dyes.

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