scholarly journals A study of adsorption isotherms for the removal of herbicide Atlantis WG from aqueous solutions by using Bentonite clay

2015 ◽  
Vol 12 (1) ◽  
pp. 148-156
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Equilibrium Concentration ◽  
Bentonite Clay ◽  
Langmuir Model ◽  
Effect Of Temperature ◽  
Isotherm Models ◽  
Sorption Data ◽  
Freundlich Model ◽  
The Subject

The subject of this research involves studying adsorption to removal herbicide Atlantis WG from aqueous solutions by bentonite clay. The equilibrium concentration have been determined spectra photometry by using UV-Vis spectrophotometer. The experimental equilibrium sorption data were analyzed by two widely, Langmuir and Freundlish isotherm models. The Langmuir model gave a better fit than Freundlich model The adsorption amount of (Atlantis WG) increased when the temperature and pH decreased. The thermodynamic parameters like ?G, ?H, and ?S have been calculated from the effect of temperature on adsorption process, is exothermic. The kinetic of adsorption process was studied depending on Lagergren ,Morris ? Weber and Rauschenberg equations.

Synthesis, Characterization and Adsorption Studies of a Graphene Oxide/Polyacrylic Acid Nanocomposite Hydrogel

2021 ◽  
Vol 19 (9) ◽  
pp. 46-54
Author(s):  
Makarim A. Mahdi ◽  
Aymen A.R. Jawad ◽  
Aseel M. Aljeboree ◽  
Layth S. Jasim ◽  
Ayad F. Alkaim
Keyword(s):  
Industrial Effluents ◽  
Langmuir Model ◽  
Isotherm Models ◽  
Nanocomposite Hydrogel ◽  
Adsorption System ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Dye Sorption ◽  
Pseudo Second Order

The AAc/GO nanocomposite hydrogel was successfully employed as a polymeric Nano sorbent of the removal efficiency of M G dye from the model. The complication of the mechanism of the adsorption system was completely exposed by examining how solution pH affects adsorption, Ionic strength isotherm models, kinetic models, and thermodynamics. The adsorption of the MG dye was greatly dependent on the solution pH. The Freundlich model has been demonstrated to be the most accurate in describing the MG dye sorption, whilst the Langmuir model was shown to be the least accurate. Additionally, these integrated mechanisms fit nicely within the framework of a pseudo-second-order model. Additionally, the contact time at equilibrium short (ten minutes) required to MG removes demonstrates the AAc/GO nanocomposite hydrogel can be considered an efficient and potentially useful adsorbent for MG removal from industrial effluents.

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.

scholarly journals Adsorption Study for Chromium (VI) on Iraqi Bentonite

2010 ◽  
Vol 7 (1) ◽  
pp. 745-756
Author(s):  
Baghdad Science Journal
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Kinetic Equations ◽  
Bentonite Clay ◽  
Sorption Process ◽  
Adsorption Study ◽  
Chromium Vi ◽  
Freundlich Adsorption Isotherm ◽  
Different Temperatures ◽  
The Subject

The subject of this research involves studying adsorption to remove hexavalent chromium Cr(VI) from aqueous solutions. Adsorption process on bentonite clay as adsorbent was used in the Cr(VI) concentration range (10-100) ppm at different temperatures (298, 303, 308 and 313)K, for different periods of time. The adsorption isotherms were obtained by obeying Langmuir and Freundlich adsorption isotherm with R2 (0.9921-0.9060) and (0.994-0.9998), respectively. The thermodynamic parameters were calculated by using the adsorption process at four different temperatures the values of ?H, ?G and ?S was [(+6.582 ? +6.547) kJ.mol-1, (-284.560 ? -343.070) kJ.mol-1 and (+0.977 ? +1.117) kJ.K-1.mol-1] respectively. This data indicates the spontaneous sorption process. The kinetic study of adsorption process was studied depending on three kinetic equations: 1- Lagergren equation 2- Morris-Weber equation 3- Reichenberg equation

scholarly journals Removal of anthracene from aqueous solutions using modified magnetic Fe3O4 nanoparticles by dendrimer polymer chains and 4-aminophenol Ligandide

2020 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Polymer Chains ◽  
Isotherm Models ◽  
Operational Parameters ◽  
X Ray Diffraction ◽  
Residual Concentration ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
The Fourier Transform

Background: Anthracene is an organic compound and environmentally resistant pollutant that causes severe damage to human health due to toxic and carcinogenic properties. The present study aimed to investigate the efficiency of magnetic dendrimer nano-adsorbent for the removal of anthracene from aqueous solutions. Methods: In this study, the synthesized iron oxide nanoparticles were modified by dendrimer polymer chains and 4-aminophenol ligand. The Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy were conducted to examine the nano-absorbent properties. Different operational parameters in the adsorption process in batch and laboratory conditions were also studied, and the adsorbent reusability was correspondingly examined in this study. The residual concentration of anthracene in aqueous solution was determined and reported by a spectrophotometer. Findings: Optimization results showed that the maximum adsorbent capacity under optimum conditions (pH=7, 20 mg/L anthracene concentration, 0.5 g/L adsorbent dosage, and 30 min contact time) was equal to 83 mg/g. The experimental data fitted with different isotherm models showed that the equilibrium data were well described by the Langmuir model. In this study, the adsorption process overlapped more with the pseudo-second-order kinetics model. Conclusion: The obtained results indicated that the synthesized nanostructured adsorbent has a high adsorption capacity with high recovery and is efficient enough to remove anthracene from aqueous solutions.

scholarly journals Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Maryam Rezaei ◽  
Nima Pourang ◽  
Ali Mashinchian Moradi
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Model ◽  
Influential Factor ◽  
Freundlich Model ◽  
Box Behnken Design ◽  
Initial Concentration ◽  
Affective Factors ◽  
Maximum Sorption ◽  
First Time ◽  
Xrf Analyses

AbstractThe biosorptive potentials of three aquatics-based biosorbents, including shells of a bivalve mollusk and scales of two fish species for Pb removal from aqueous solutions were evaluated, for the first time. A Box–Behnken design with the response surface methodology was used to investigate the effects of the seven important variables (contact time, temperature, initial concentration, dosage, size, salinity and pH) on the sorption capacity of the sorbents. Among the seven studied factors, the effects of biosorbent dosage, initial concentration and pH were significant for all the response variables, while biosorbent size was not significant for any of the responses. The initial concentration was the most influential factor. The presence of Pb ions on the surfaces of the biosorbents after the adsorption was clearly confirmed by the SEM–EDX and XRF analyses. The maximum sorption capacities of the biosorbents were comparable to the literature and the descending order was as follows: scales of Rutilus kutum and Oncorhynchus mykiss and the shells of Cerastoderma glaucum. The isotherm studies revealed Langmuir model applicability for the Pb adsorption by R. kutum and O. mykiss scales, while Freundlich model was fitted to the adsorption C. glaucum shells.

scholarly journals Adsorption of Malachite Green by Jordanian Diatomite Ores: Equilibrium Study

2019 ◽  
Vol 2 (1) ◽  
pp. 92-99
Author(s):  
Emad El Qada
Keyword(s):  
Particle Size ◽  
Adsorption Process ◽  
Isotherm Models ◽  
Equilibrium Isotherm ◽  
Freundlich Model ◽  
Equilibrium Study ◽  
Liquid Phase Adsorption ◽  
Experimental Parameters ◽  
Optimum Ph ◽  
Adsorption Processes

The focal theme of this work is to assess the ability of Jordanian diatomite to treat MG-bearing effluents. Effects of several experimental parameters namely, particle size of diatomite, pH and initial MG concentration were investigated through liquid-phase adsorption processes. Several equilibrium isotherm models were applied. It was found that initial MG concentration, pH and particle size of diatomite had a significant effect on the adsorption process. MG uptake has increased from 99.3 mg/dm3 to 898.7 mg/dm3 over the whole concentration range. A high percentage of MG removal (99.6%) was achieved as the diatomite particle size decreased from 500-710μm to 125-250μm. The optimum pH for the removal of MG was=9. Freundlich model was satisfactorily applied to the experimental data.

The Removal of Strontium(II) and Neodymium(III) from their Aqueous Solutions on Chrysotile Nanotubes

2014 ◽  
Vol 881-883 ◽  
pp. 519-524 ◽  
Author(s):  
Lei Lei Cheng ◽  
Xiao Dong Wei ◽  
Xiao Lei Hao ◽  
Di Ruan ◽  
Shao Ming Yu
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Hydrothermal Method ◽  
Adsorption Mechanism ◽  
Langmuir Model ◽  
Isotherm Models ◽  
Equilibrium Isotherm ◽  
Adsorption Capacities ◽  
Adsorption Desorption

In this research, chrysotile nanotubes (ChNTs) were synthesized by the hydrothermal method. Synthetic ChNTs were characterized using XRD, SEM, TEM and N2adsorption-desorption. Adsorption technique was applied for removal of Sr (II) and Nd (III) from aqueous solution by using ChNTs. The process had been investigated as a function of pH and temperature. The experimental data were analyzed using equilibrium isotherm models. The adsorption isotherms are fitted well by Langmuir model, having a maximum adsorption capacities of 102.56 mg·g-1for Sr (II) and 47.44 mg·g-1for Nd (III) at 298 ± 1 K. FTIR and XPS techniques were employed to investigate possible adsorption mechanism.

scholarly journals Kinetic Sorption Studies of Heavy Metal Contamination on Indian Expansive Soil

2009 ◽  
Vol 6 (4) ◽  
pp. 1125-1132 ◽  
Author(s):  
M. K. Gupta ◽  
A. K. Singh ◽  
R. K. Srivastava
Keyword(s):  
Heavy Metal Contamination ◽  
Expansive Soil ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Sorption Data ◽  
Freundlich Model ◽  
Metallic Cadmium ◽  
Pseudo Second Order ◽  
Alluvial Clay

Sorption of metallic cadmium from the pH adjusted aqueous solutions at varying initial concentrations onto an alluvial (clay) soil through batch sorption experiments was studied. The pH of the initial concentrations ranging between 50 mg/L to 250 mg/L was varied from 3.0 to 8.0. The sorption experiments were carried out for different durations and up to 16 hours. The cadmium continued to sorb till the last experimental pH=8. The experimental sorption data fitted very well with both Langmuir and Freundlich isotherm models and Freundlich model gave higher correlation coefficients. The pseudo-second order kinetics model was most agreeable with the experimental sorption data, whereas the pseudo-first order model was found to be insufficient.

Removal of Hexavalent Chromium from Aqueous Solutions by Ion-Exchange Resin

2012 ◽  
Vol 550-553 ◽  
pp. 2333-2337
Author(s):  
Zhen Yu Li ◽  
Shuang Hu
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Adsorption Process ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Order Rate Equation

The adsorption of hexavalent chromium [Cr(VI)] from aqueous solutions using weakly basic ion-exchange resin D301 was studied in this work. The result showed that the adsorption of Cr(VI) was strongly dependent on pH, the optimum condition was investigated at pH 2 and the maximum adsorption capacity was 247.71 mg g-1. The equilibrium datas were fitted well with Langmuir and Redlich–Peterson isotherm models. The pseudo-second-order rate equation was best represented by the adsorption process.

scholarly journals Effect of the strong magnetic field on copper adsorption processes on activated carbon

2017 ◽  
Vol 8 (2) ◽  
pp. 7-10 ◽  
Author(s):  
Krzysztof Rajczykowski ◽  
Krzysztof Loska
Keyword(s):  
Magnetic Field ◽  
Activated Carbon ◽  
External Magnetic Field ◽  
Adsorption Process ◽  
Equilibrium Concentration ◽  
Process Efficiency ◽  
Effect Of Temperature ◽  
Copper Adsorption ◽  
Adsorption Processes ◽  
The Magnetic Field

In the presented studies an influence of the strong static magnetic field on the process of copper adsorption on activated carbon was analysed. The magnetic field was generated by the annular neodymium magnets, placed at the bottom of the glass reactors, with the magnetic induction value at the surface equal 0.517 T. Additionally, during the study an effect of temperature on the adsorption process efficiency and its susceptibility to the external magnetic field was also investigated. As a result of the study, it was found that using a magnetic modification can increase the efficiency of the adsorption process up to 80%. However, such a strong influence of the external magnetic field was observed only in the case of relatively low initial and equilibrium concentration of the adsorbate. With the increase of the equilibrium concentration, stimulating nature of the magnetic field weakened significantly until finally at an equilibrium concentration about 80 mg/dm3, it was almost negligible. In addition, it was also found that the magnetic field modifications were much more efficient if the adsorption processes were conducted at the higher temperature.

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