scholarly journals A Comparative Study on the Adsorption of Two Remazol Dyes on Green Adsorbent

2020 ◽  
Vol 71 (4) ◽  
pp. 248-257
Author(s):  
Eszter Rapo ◽  
Krisztina Jakab ◽  
Katalin Posta ◽  
Maria Suciu ◽  
Szende Tonk
Keyword(s):  
Textile Industry ◽  
Morphological Structure ◽  
Sem Analysis ◽  
Textile Dyes ◽  
Second Order ◽  
Isotherm Models ◽  
Textile Dye ◽  
Adsorption Parameters ◽  
Experimental Conditions ◽  
Pseudo Second Order

Due to the large amount of wastewater discharged by the textile industry, many alternative researches have been undertaken in recent years to effectively remove textile dyes from water. In our study, the adsorption from aqueous solution of two important textile dyes, reactive azo dyes Remazol Red (RR) and Remazol Blue (RB) was studied with calcined chicken eggshell (Gallus Gallus domesticus) adsorbent. Batch biosorption studies were conducted to evaluate the effect of various parameters, such as contact time, initial dye concentration, amount of adsorbent, and pH, to determine the optimal adsorption parameters (Remazol Brilliant Red F3B: Ci=20 mg/l, 1.5g adsorbent, 160 μm, 700 rpm, pH=6.0�0.2, T=20�2 oC, where E%=97.3; Remazol Brilliant Blue R: Ci=20 mg/l, 1.5 g adsorbent, 160 μm, 700 rpm, pH=6.0�0.2, T=20�2oC, where E%=98.8). The changes in morphological structure were evaluated by SEM analysis. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models. Biosorption kinetics data were tested using pseudo-first-order, pseudo-second-order, where in our experimental conditions the biosorption followed a pseudo-second-order reaction. EDS analyses were carried out, and bioconcentration factors were calculated before and after adsorption. The results of this study indicate that adsorption with calcined eggshell is a promising, feasible, reliable and eco-friendly method for Remazol textile dye removal from aqueous solutions.

Preparation of mesoporous activated carbon from date stones for the adsorption of Bemacid Red

2019 ◽  
Vol 79 (7) ◽  
pp. 1357-1366 ◽  
Author(s):  
Rabia Boudia ◽  
Goussem Mimanne ◽  
Karim Benhabib ◽  
Laurence Pirault-Roy
Keyword(s):  
Activated Carbon ◽  
Textile Industry ◽  
Contact Time ◽  
Adsorption Process ◽  
Agricultural Waste ◽  
Organic Pollutant ◽  
Second Order ◽  
Textile Dye ◽  
Solution Ph ◽  
Pseudo Second Order

Abstract This work concerns the elimination of the organic pollutant; Bemacid Red (BR), a rather persistent dye present in wastewater from the textile industry in western Algeria, by adsorption on carbon from an agricultural waste in the optimal conditions of the adsorption process. An active carbon was synthesized by treating an agro-alimentary waste, the date stones that are very abundant in Algeria, physically and chemically. Sample after activation (SAA) with phosphoric acid was highly efficient for the removal of BR. The characterization of this porous material has shown a specific surface area that exceeds 900 m2/g with the presence of mesopores. The iodine value also indicates that the activated carbon obtained has a large micro porosity. The reduction of the infrared spectroscopy (FTIR) bands reveals that the waste has been synthesized and activated in good conditions. Parameters influencing the adsorption process have been studied and optimized, such as contact time, adsorbent mass, solution pH, initial dye concentration and temperature. The results show that for a contact time of 60 min, a mass of 0.5 g and at room temperature, the adsorption rate of the BR by the SAA is at its maximum. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were studied to analyse adsorption kinetics. The result shows the adsorption kinetic is best with the pseudo-second-order model. In this study, Langmuir, Freundlich and Temkin isotherms were investigated for adsorption of BR onto SAA. The Freundlich and Temkin isotherms have the highest correlations coefficients. The suggested adsorption process involves multilayer adsorption with the creation of chemical bonds. The mechanism of adsorption of BR by SAA is spontaneous and exothermic, and the Gibbs free energy values confirm that the elimination of the textile dye follows a physisorption.

Synthesis of Kit-6 magnetite silica nanocomposite functionalized by amine group for removal of Carmoisine dye from aqueous solutions

2020 ◽  
Vol 23 ◽  
Author(s):  
Seyedeh Mahsa Seyed Danesh ◽  
Shahab Shariati ◽  
Hossein Faghihian
Keyword(s):  
Aqueous Solutions ◽  
Second Order ◽  
Isotherm Models ◽  
Infrared Spectrometry ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
X Ray ◽  
Food Dye ◽  
Pseudo Second Order ◽  
Silica Nanocomposite

Objective: In this study, amine functionalized magnetite Kit-6 silica nanocomposite (Fe3O4@SiO2@Kit-6-NH2) was synthesized as an adsorbent for removing Carmoisine food dye from aqueous solutions. Method: The nanocomposite was chemically synthesized and was characterized by X-ray diffraction analysis (XRD), vi-brating sample magnetometer (VSM), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FT-IR). Taguchi orthogonal array experimental design method was used to op-timize the experimental conditions including adsorbent amount, pH of solution, amount of salt, the volume of sample and contact time. Pseudo first-order, pseudo second-order, intra-particle diffusion and Elovich kinetic models were investigated to study the kinetic parameters of sorption process. Results: The kinetic data corresponded to the pseudo second-order kinetic model with R2 = 0.9999. Also, adsorption data were analyzed using Langmuir, Freundlich and Temkin isotherm models. The results indicated that the data were well fitted to the Freundlich isotherm model (R2 = 0.9984, n=1.0786). The reusability tests showed the proposed nanocomposite can be used more than 8 cycles with removal efficiency higher than 90%. Conclusion: The applicability study of proposed nanocomposite proved its ability for efficient removal of Carmoisine dye from real aqueous samples.

Biosorption of Cd(II) Ions from Aqueous Solution Onto Eggshell Waste Kinetic and equilibrium isotherm studies

2017 ◽  
Vol 68 (9) ◽  
pp. 1951-1958
Author(s):  
Szende Tonk ◽  
Cornelia Majdik ◽  
Robert Szep ◽  
Maria Suciu ◽  
Eszter Rapo ◽  
...  
Keyword(s):  
Metal Ion ◽  
Physical Adsorption ◽  
Morphological Structure ◽  
Sem Analysis ◽  
Second Order ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Batch Biosorption ◽  
Eggshell Waste

Eggshell waste as adsorbent was successfully used for the removal of Cd(II) ions from model synthetic aqueous solutions. Batch biosorption studies were conducted in order to evaluate the effect of various parameters, such as: contact time and initial metal ion concentration. The changes in the morphological structure were evaluated by TEM and SEM analysis. The experimental isotherm data were analysed using Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm equations, using regression analysis linear and non-linear form. Langmuir model was found to be in better correlation with experimental data (R2=0.99). Biosorption kinetics data were tested using pseudo-first-order, pseudo-second-order, intra-particle and liquid film diffusion models. Kinetics studies showed that the biosorption followed a pseudo-second-order reaction. Removal efficiencies up to 92 % and a maximum adsorption capacity of 8.2 mg/g Cd(II) were obtained experimentally and 7.14 mg/g Cd(II) were obtained from Langmuir isotherm model. The percentage of metal sorption (Ci=11 mg/L, E,(%)=92.42), EDS analyses, and bioconcentration factor were also calculated. The investigation findings suggested that the physical adsorption is controlling the adsorption rate. Results of this study indicate that eggshell waste can be effectively used for the removal of Cd(II) ions from aquatic environments. The process is feasible, reliable and eco-friendly.

Removal of Cadmium (II) Ions from Aqueous Phase by Biosorption on Biological Activated Dates' Pedicels (Kinetic, Equilibrium and Thermodynamic Study)

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Hynda Yazid ◽  
Zahra Sadaoui ◽  
Rachida Maachi
Keyword(s):  
Freundlich Isotherm ◽  
Sem Analysis ◽  
Second Order ◽  
Isotherm Models ◽  
Heterogeneous Structure ◽  
Order Kinetic ◽  
Biological Pretreatment ◽  
Biosorption Capacity ◽  
Pseudo Second Order ◽  
Bacterial Film

The preparation of biological activated dates’ pedicels (ADP) adsorbents and its biosorption behaviour of cadmium (II) was the topic of this study. The raw (RDP) and activated (ADP) dates’ pedicels were characterized by SEM, XRF, FTIR and surface area analysis. SEM analysis revealed a heterogeneous structure for ADP and a cellular aspect different from that of RDP, due to the deposit of the bacterial film which has been constituted during the biological treatment of the material. The XRF results show the presence of potassium, calcium in RPD, and sodium in APD which could favour the retention of heavy metals in aqueous solutions by ions exchange. The FT-IR spectra showed that there are different functional groups in adsorbents, which are able to react with metal ions in aqueous solution. Biological pretreatment was carried out in nitrate enriched solution; allowing to enhance the development of denitrifying micro-organisms already existing on the organic support without the need for biomass inoculation. Biological pretreatment allowed the appearance of a bacterial film at the surface of the date pedicel particles, which improved their biosorption capacity. Indeed, the biosorption yields of cadmium (II) ions obtained at equilibrium (60 min) were 70.4 and 57.4% for ADP and RDP, respectively. The experimental data were analyzed by the Langmuir and Freundlich isotherm models and the model constants were evaluated. The maximum biosorption capacity as calculated using the Langmuir isotherm model was 10.75 mg g-1 which is greater than that of commercial and granular activated carbon. The kinetic data obtained at different initial cadmium concentrations and different temperatures were analyzed using pseudo-second-order and intra-particle diffusion models. The biosorption kinetics followed a pseudo-second-order kinetic model. The biosorption of cadmium ion was endothermic and spontaneous. Elution efficiencies with different concentrations of CaCl2, KCl and NaCl were evaluated. The desorption studies showed the reversibility of biosorption and CaCl2 was the most efficient desorbent for elution and desorption of cadmium from the biosorbant.

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

2015 ◽  
Vol 11 (6) ◽  
pp. 3685-3697 ◽  
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. 

scholarly journals Lifting removal of cationic dye (methylene blue) from wastewater by improving Zr-MOFs via second metal Al coordination

2021 ◽  
Vol 2 (2) ◽  
pp. 94-111
Author(s):  
Naser Al Amery ◽  
Hussein Rasool Abid ◽  
Shaobin Wang ◽  
Shaomin Liu
Keyword(s):  
Experimental Data ◽  
Methylene Blue ◽  
Correlation Coefficient ◽  
Textile Industry ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Models ◽  
Aquatic Life ◽  
Hazardous Chemical ◽  
Pseudo Second Order

Metal organic frameworks (MOFs) are frequently used as adsorbents in adsorption processes to remove dyes from effluent produced by the textile industry. Today, dye contaminants have become an important environmental problem. One of these dyes is methylene blue (MB) and its removal from wastewater is a priority because it is persistent and nondegradable. MB is used in many industries although it has potential harmful effects on human and aquatic life and can be considered a hazardous chemical when in wastewater. The present study shows the potential applications for enhanced forms of UiO-66 MOFs, such as UiO-66, UiO-66-10%Al and UiO-66-30%Al. These forms were prepared to remove MB from wastewater using batch experiments. Characterisation of adsorbents were accomplished successfully using Fourier transform infrared, X-ray powder diffraction, Brunauer–Emmett–Teller surface area and thermogravimetric analysis techniques. To investigate equilibrium adsorptive behaviour, Langmuir and Freundlich isotherm models were tested against the experimental data. Based on linear regression correlation coefficient (R2), the Freundlich model described the equilibrium isotherm of MOF/MB better than the Langmuir model. Of all forms of UiO-66 MOF, UiO-66-10%Al had the maximum Langmuir adsorption capacity at 49.26 mg/g. A kinetics study examined pseudo first-order, pseudo second order and Elovich models to determine which could explain the sorption mechanism. While the pseudo second order and Elovich models showed a good fit with the experimental data, the correlation coefficient of the pseudo second-order model was the highest. These results indicate that adsorption of MB is controlled by a chemisorption mechanism. Further, intraparticle diffusion was utilised to describe the adsorption mechanism and determine the rate-limiting steps in the adsorption process.

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

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).

scholarly journals Cr6+ adsorption by modified vermiculite

2020 ◽  
Author(s):  
Valeria Medoro ◽  
Celia Marcos Pascual ◽  
Giacomo Ferretti ◽  
Giulio Galamini ◽  
Massimo Coltorti
Keyword(s):  
Earth Sciences ◽  
Inductively Coupled Plasma ◽  
Contact Time ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
X Ray ◽  
Pseudo Second Order

&lt;p&gt;&lt;strong&gt;Abstract&lt;/strong&gt;: &lt;strong&gt;Cr&lt;sup&gt;6+&lt;/sup&gt; adsorption by modified vermiculite&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;&amp;#160;&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;Valeria Medoro- University of Ferrara , Department of Physics and Earth Sciences, Italy&lt;/p&gt;&lt;p&gt;Celia Marcos Pascual-University of Oviedo, Department of Geology, Spain&lt;/p&gt;&lt;p&gt;Giacomo Ferretti- University of Ferrara , Department of Physics and Earth Sciences, Italy&lt;/p&gt;&lt;p&gt;Giulio Galamini- University of Ferrara , Department of Physics and Earth Sciences, Italy&lt;/p&gt;&lt;p&gt;Massimo Coltorti- University of Ferrara , Department of Physics and Earth Sciences, Italy&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;This work aimed at investigating the adsorption of Cr&lt;sup&gt;6+&lt;/sup&gt;&amp;#160;in water by exfoliated vermiculite. The adsorbant tested in this experiment was a vermiculite (from China) which has been subjected to heating at 1000 &amp;#176;C for 1 minute, resulting in an exfoliated vermiculite.&lt;/p&gt;&lt;p&gt;Three effects were studied: 1) contact time; 2) initial concentracion of Cr&lt;sup&gt;6+&lt;/sup&gt;; 3) adsorbent mass. Samples were analysed by X Ray Fluorescence (XRF), X Ray Diffraction (XRD) and the solutions with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to quantify the adsorbed Cr&lt;sup&gt;6+&lt;/sup&gt; by the vermiculite.&lt;/p&gt;&lt;p&gt;Results from XRD diffraction showed a conversion of vermiculite into flogopite&amp;#160; after heating at 1000&amp;#176;C for 1 minute because of: 1) high content of potassium, 2) dehydration and 3) structural re-ordering; after the contact of vermiculite with Cr&lt;sup&gt;6+&lt;/sup&gt;, the mineral structure did not change. The adsorption of Cr&lt;sup&gt;6+&lt;/sup&gt;&amp;#160;was studied by Langmuir, Freundlich and&amp;#160;Dubinin-Kaganer-Radushkevich&amp;#160;(DKR) isotherm models. DKR model, indicative of a cooperative process, described adsorption equilibrium better than the other two models and the maximum adsorption capacity obtained was of 2.81 mol/g. Kinetic was studied using pseudo-first and pseudo-second order kinetic models, with a better description of the process by pseudo-second order model with correlation coefficient almost unitary (R&lt;sup&gt;2&lt;/sup&gt;=0.9984; other kinetic parameters were k&lt;sub&gt;2&lt;/sub&gt;=0.0015 and the absorption initial rate of 0.2x10&lt;sup&gt;-8&lt;/sup&gt; mg g&lt;sup&gt;-1&lt;/sup&gt; h&lt;sup&gt;-1&lt;/sup&gt;).&amp;#160;&lt;/p&gt;&lt;p&gt;The present study demonstrates the effectiveness of modified vermiculite adsorbents for the treatment of hexavalent chromium-contaminated waters and that its adsorption depends on the experimental conditions (such as contact time, initial concentracion of Cr&lt;sup&gt;6+&lt;/sup&gt; and adsorbent mass).&lt;/p&gt;

scholarly journals Kinetic of Phenol Adsorption by Mesoporous MCM-41 Nanoparticles

2019 ◽  
Vol 8 (12S) ◽  
pp. 316-323 ◽  
Keyword(s):  
Kinetic Equations ◽  
Sem Analysis ◽  
Second Order ◽  
Isotherm Models ◽  
Potential Candidate ◽  
Order Kinetic ◽  
Intraparticle Diffusion Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Mcm 41

In the present study application of MCM-41 for removal of phenol was investigated. MCM-41nano-adsorbent was synthesized and characterized by FTIR, XRD and SEM analysis. Adsorption isotherm experiment was performed in batch shake flask. The experimental data were analyzed using various isotherm models. Result revealsthat,Langmuir isotherm model fitted the data very well for the removal of phenol by the MCM-41 adsorbents. The calculated dimensionless separation factor, RL indicates that the adsorption of phenol onto MCM-41 was favorable. Pseudo-first order, pseudo-second order kinetic equations and intraparticle diffusion model were applied to analyze the adsorption kinetics of the MCM-41 at different initial phenol concentrations. It was found that the adsorption of phenol on to the MCM-41 follows the pseudo-second order kinetic. At an initial phenol concentration of 130 mgl-1, more than 99% phenol, 93% COD along with 96% of toxicity removal were achieved. Thus, the synthesized mesoporous MCM-41 proved to be a potential candidate for removal of phenol from industrial wastewater.

scholarly journals Investigation of competitive adsorption and desorption of heavy metals from aqueous solution using raw rock: Characterization kinetic, isotherm, and thermodynamic

2021 ◽  
Vol 348 ◽  
pp. 01016
Author(s):  
Rajaa Bassam ◽  
Marouane El Alouani ◽  
Nabila Jarmouni ◽  
Jabrane Maissara ◽  
Mohammed El Mahi Chbihi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Langmuir Model ◽  
Second Order ◽  
Isotherm Models ◽  
Desorption Process ◽  
Pseudo Second Order ◽  
Rock Characterization ◽  
Metals Adsorption

Heavy metals are the most dangerous inorganic pollutants Due to their bioaccumulation and their nonbiodegradability, for this, several studies have focused on the recovery of these metals from water using different techniques. In this context, our study consists of evaluating an efficient and eco-friendly pathway of competitive recovery of heavy metals (Cd, Cr and As) from aqueous solutions by adsorption using raw rock. This adsorbent was characterized before and after the adsorption process by several techniques. The multi-metals adsorption process in the batch mode was undertaken to evaluate the effect of adsorbent mass, contact time, pH, Temperature, and initial heavy metals concentration. The kinetic data were analyzed using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models. According to the modeling of the experimental results, the adsorption kinetics of heavy metals were adapted to the pseudo-second-order model. The adsorption isotherms were evaluated by the Langmuir and Freundlich isotherm models. The experimental isotherm data of heavy metals were better fitted with the Langmuir model rather than Freundlich isotherm models. The maximum experimental adsorption capacities (Qmax) predicted by the Langmuir model are 15.23 mg/g for Cd (II), 17.54 mg/g for Cr (VI) and 16.36 mg/g for As (III). The values of thermodynamic parameters revealed that the heavy metals adsorption was exothermic, favorable, and spontaneous in nature. The desorption process of heavy metals showed that this raw rock had excellent recycling capacity. Based on the results, these untreated clays can be used as inexpensive and environmentally friendly adsorbents to treat water contaminated by heavy metals.

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