scholarly journals Adsorptive removal of Pb(II) and Cd(II) ions from aqueous solution onto modified Hiswa iron-kaolin clay: Equilibrium and thermodynamic aspects

2021 ◽  
Author(s):  
CI Chemistry International
Keyword(s):  
Isotherm Models ◽  
Kaolin Clay ◽  
Lead And Cadmium ◽  
Adsorption Isotherm Models ◽  
Experimental Parameters ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Different Temperatures ◽  
Enthalpy And Entropy ◽  
Entropy Of Adsorption

In view of promising adsorption efficiency of clay based materials, a modified iron-kaolin clay was used as an adsorbent of Pb(II) and Cd(II) ions from aqueous solutions. The effects of various experimental parameters, such as initial metal ions concentration, contact time, temperature and pH were investigated. The Langmuir and Freundlich adsorption isotherm models were applied to the experimental equilibrium data at different temperatures. The maximum adsorption capacities of Pb(II) and Cd(II) ions were 76.92 and 75.19 (mg/g), respectively. Thermodynamic parameters such as the change of Gibbs free energy, enthalpy and entropy of adsorption were also calculated and it was found that the lead and cadmium ions uptake by modified kaolin clay is endothermic and spontaneous in nature.

Chitosan-coated black sesame (Sesamum indicum L.) seed pulp as a novel candidate adsorbent for Cr(VI) elimination

2019 ◽  
Vol 79 (4) ◽  
pp. 688-698
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna ◽  
Elif Özdemir ◽  
Erol Pehlivan
Keyword(s):  
Adsorption Capacity ◽  
Sesame Seed ◽  
Sesamum Indicum ◽  
Isotherm Models ◽  
Physical Treatment ◽  
Adsorption Isotherm Models ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Synthetic Solution ◽  
Maximum Removal

Abstract This study evaluates the application of Cr(VI) adsorption from the prepared synthetic solution by black sesame (Sesamum indicum L.) seed pulp (BSSP) and chitosan (Cts)-coated black sesame seed pulp beads (Cts-BSSP). BSSP and Cts-BSSP were used as an adsorbent without any chemical or physical treatment to remove Cr(VI) from an aqueous medium. The results indicated that the Cr(VI) removal was pH-dependent and reached an optimum at pH 2.0. It has been observed that the percentage of adsorption increased from 62% to 95% when the amount of Cts-BSSP increased from 0.0125 g to 0.0250 g. The required adsorbent amount for the maximum removal was 0.05 g and 0.1 g for Cst-BSSP and BSSP, respectively. The contact time for the adsorption was 120 min and 90 min for BSSP and Cst-BSSP, respectively. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to explore the possible adsorption mechanism for Cr(VI). The equilibrium data for the BSSP and Cts-BSSP were used with the Langmuir and Freundlich adsorption isotherm models to assess the adsorption capacity and relevant mechanism. The adsorption capacity of the Cts-BSSP for Cr(VI) is relatively high compared to BSSP. The monolayer maximum adsorption capacities for Cr(VI) ions were 31.44 and 18.32 mg/g for Cts-BSSP and BSSP, respectively.

scholarly journals Studies on Removal of Cr (VI) from Aqueous Solutions Using Powder of Mosambi Fruit Peelings (PMFP) As a Low Cost Sorbent

2012 ◽  
Vol 9 (3) ◽  
pp. 1389-1399 ◽  
Author(s):  
R. Hema Krishna ◽  
A. V. V. S. Swamy
Keyword(s):  
Particle Size ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Low Cost ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Batch Tests ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Agitation Time

The powder of mosambi fruit peelings (PMFP) was used as an adsorbent for the removal of heavy metal like Cr (VI) from aqueous solutions was studied using batch tests. The influence of physico-chemical key parameters such as the initial metal ion concentration, pH, agitation time, adsorbent dosage, and the particle size of adsorbent has been considered in batch tests. Sorbent ability to adsorb Cr (VI) ions was examined and the mechanism involved in the process investigated. The optimum results were determined at an initial metal ion concentration was 10 mg/lit, pH=2, agitation time – 60 min, an adsorbent dose (150 mg/50 ml) and the particle size (0.6 mm). The % adsorption, Langmuir constants [Q0=7.51(mg/g) and b=1.69(mg/lit)] Freundlich constant(Kf=2.94), Lagergren rate constants (Kad(min-1)=5.75 x 10-2) for [Cr(VI)] 10 mg/lit were determined for the adsorption system as a function of sorbate concentration. The equilibrium data obtained were tested using Langmuir, Freundlich adsorption isotherm models, and the kinetic data obtained were fitted to pseudo first order model.

Heterogeneity Analysis of Single-Walled Carbon Nanotubes from the Adsorption Equilibria of Nitrogen and Benzene

2006 ◽  
Vol 6 (11) ◽  
pp. 3583-3588
Author(s):  
Wang-Geun Shim ◽  
Hyun-Chul Kang ◽  
Chan Kim ◽  
Jae-Wook Lee ◽  
Sang-Chai Kim ◽  
...  
Keyword(s):  
Second Virial Coefficient ◽  
Nitrogen Adsorption ◽  
Isosteric Heat ◽  
Heat Of Adsorption ◽  
Isotherm Models ◽  
Type I ◽  
Isosteric Heat Of Adsorption ◽  
Adsorption Equilibria ◽  
Equilibrium Data ◽  
Different Temperatures

Nitrogen adsorption/desorption isotherms and gravimetric methods were employed to examine the structural and adsorption properties of selected adsorbent. The equilibrium data of benzene were also obtained at three different temperatures (303.15, 313.15, and 323.15 K) with pressures up to 7 kPa. The results of nitrogen and benzene sorption isotherm revealed that SWCNTs exhibit type II with the features of type I. The Toth and UNILAN models were found to provide a reasonable correlation between the adsorption isotherm data. In addition, the adsorption second virial coefficient and the isosteric heat of adsorption were determined by using these isotherm models. The isosteric heat of adsorption and adsorption energy distribution indicated that SWCNTs have energetically and structurally heterogeneous surfaces.

scholarly journals Chemical and physical preparation of activated carbon using Raw bagasse for cationic dye adsorption

2016 ◽  
Vol 18 (2) ◽  
pp. 402-415 ◽  
Keyword(s):  
Activated Carbon ◽  
Sugarcane Bagasse ◽  
Contact Time ◽  
Dye Adsorption ◽  
Isotherm Models ◽  
Adsorptive Capacity ◽  
Adsorption Isotherm Models ◽  
Equilibrium Data ◽  
Agriculture Wastes ◽  
Physical Preparation

<div> <p>Agriculture wastes like sugarcane bagasse are available in large quantities in Egypt. Various adsorbents from natural materials, industrial waste materials, agricultural by-products, and biomass based activated carbon can be used in the removal of various dyes. Raw Bagasse pith (RBP) was used to prepare activated carbon (AC) using phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) as a chemical activating agent. C The raw BP and the synthesized adsorbent were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM). The effectiveness of AC prepared in adsorption of methylene blue (MB) has been studied as a function of adsorbent type, initial dye concentration and contact time. The effects of the initial dye concentration and contact time were evaluated. Adsorption isotherm models - Langmuir, Freundlich and Temkin were used to simulate the equilibrium data. Langmuir equation was found to have the highest value of R<sup>2</sup> compared with other models. Furthermore, it was found that sugarcane bagasse have a high adsorptive capacity towards MB.</p> </div> <p>&nbsp;</p>

scholarly journals Solvent-Free Synthesized Monolithic Ultraporous Aluminas for Highly Efficient Removal of Remazol Brilliant Blue R: Equilibrium, Kinetic, and Thermodynamic Studies

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3054
Author(s):  
Huan Xu ◽  
Guilhem Boeuf ◽  
Zixian Jia ◽  
Kairuo Zhu ◽  
Mehrdad Nikravech ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Mechanical Stability ◽  
Brilliant Blue ◽  
Isotherm Models ◽  
Order Model ◽  
Isochronous Annealing ◽  
Remazol Brilliant Blue R ◽  
Equilibrium Data ◽  
Different Temperatures

In this study, ultraporous aluminas (UPA) were synthesized as new effective adsorbents for Remazol Brilliant Blue R (RBBR) removal from aqueous solutions. The UPA monoliths were grown via facile oxidation process, followed by isochronous annealing treatment in air at different temperatures, through which γ, θ, and α phase polycrystalline fibrous grains of UPA can be accordingly obtained. The experimental factors that affect the material adsorption performances including initial pH, contact time, and temperature were comprehensively studied by batch experiments. The RBBR adsorption isotherms of UPA(γ) and UPA(θ) powders were found almost identical, while UPA(α) powders showed low effectiveness. To obtain the desirable mechanical stability of the UPA monolith with considerable RBBR adsorption capacity, UPA(θ) powders were further studied. The UPA(θ) powders exhibited maximum RBBR adsorption at pH 2 due to the positively charged surface under acidic conditions. Compared with the Lagergren pseudo-first-order model, the pseudo-second-order model was found to explain the adsorption kinetics better. Despite the film diffusion dominating the adsorption process, the contributions of the intraparticle diffusion and chemical reactions were also found significant. The adsorption equilibrium data at different temperatures were fitted by the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) isotherm models. The Langmuir model was found the most effective in the description of equilibrium data, and the maximum RBBR adsorption capacity retained by UPA(θ) powders was 122.55 mg·g−1 at 295 K. Thermodynamic parameters (ΔG0, ΔH0, and ΔS0) indicated the adsorption process was spontaneous and exothermic in nature.

Carbonized medlar-core particles as a new biosorbent for removal of Cu2+ from aqueous solution and study of its surface morphology

2016 ◽  
Vol 74 (1) ◽  
pp. 236-245 ◽  
Author(s):  
Narges Samadani Langeroodi ◽  
Elaheh Safaei
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
High Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Isotherm Models ◽  
Freundlich Adsorption Isotherm ◽  
High Adsorption Capacity ◽  
Core Particles

The objective of this study was to investigate the use of carbonized medlar-core particles as a new biosorbent to remove Cu2+ from aqueous solution. Fourier transform infrared spectroscopy and scanning electron microscopy were used to characterize the biosorbent. This paper reports the effects of adsorbent dose, pH, temperature and concentration of adsorbate. Batch isotherm studies were also performed to understand the ability of the adsorbent. The adsorption behavior of the Cu2+ was studied using Langmuir and Freundlich adsorption isotherm models. The maximum adsorption capacity determined from the Langmuir adsorption equation has been found as 43.478 mg.g−1 at 298.15 K. The adsorption of Cu2+ by medlar core in carbonized form was spontaneous and endothermic. It was also found that the biosorption of Cu2+ followed second-order kinetics. Carbonized medlar-core particles showed great potential in aqueous solution due to the high adsorption capacity.

scholarly journals Sorption of Pb(II) and Cu(II) by low-cost magnetic eggshells-Fe3O4 powder

2012 ◽  
Vol 18 (2) ◽  
pp. 221-231 ◽  
Author(s):  
Jianwei Ren ◽  
Mokgadi Bopape ◽  
Katlego Setshedi ◽  
Jacob Kitinya ◽  
Maurice Onyango
Keyword(s):  
Metal Ions ◽  
Ph Value ◽  
Low Cost ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Solution Ph ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Media Interaction

This study explored the feasibility of using magnetic eggshell-Fe3O4 powder as adsorbent for the removal of Pb(II) and Cu(II) ions from aqueous solution. The metal ionsadsorption media interaction was characterized using XRD and FTIR. The effects of contact time, initial concentrations, temperature, solution pH and reusability of the adsorption media were investigated. The metal ions adsorption was fast and the amount of metal ions adsorbed increased with an increase in temperature, suggesting an endothermic adsorption. The kinetic data showed that the adsorption process followed the pseudo-second-order kinetic model. The optimal adsorption pH value was around 5.5 at which condition the equilibrium capacity was 263.2 mg/g for Pb(II) and 250.0 for Cu(II). The adsorption equilibrium data fitted very well to the Langmuir and Freundlich adsorption isotherm models. The thermodynamics of Pb(II) and Cu(II) adsorption onto the magnetic eggshell-Fe3O4 powder indicated that the adsorption was spontaneous. The reusability study has proven that magnetic eggshell-Fe3O4 powder can be employed as a low-cost and easy to separate adsorbent.

scholarly journals Adsorption of arsenazo (III) due by phosphorus-containing polymer sorbent

2016 ◽  
Vol 81 (8) ◽  
pp. 907-921 ◽  
Author(s):  
Rasim Alosmanov
Keyword(s):  
Ph Effect ◽  
Arsenazo Iii ◽  
Isotherm Models ◽  
Solution Ph ◽  
Phase Contact Time ◽  
Polymer Sorbent ◽  
Adsorption Isotherm Models ◽  
Phosphorus Containing ◽  
Equilibrium Data ◽  
Pseudo Second Order

Phosphorus-containing polymer sorbent was employed for removal hazardous Arsenazo (III) dye from water. The adsorption characteristics were determined by the study at different parameters such as effect of solution pH, effect of initial dye concentration, sorbent dose, phase contact time, and temperature. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. The highest monolayer adsorption capacity has been obtained (24.75 mg g-1) at 55?C. Different thermodynamic parameters such as free energy, enthalpy, and entropy have been calculated and it was concluded that when temperature rises, adsorption increases, indicating the endothermic nature of the process. Kinetic parameters were derived by pseudo-first-order, pseudo-second-order and intraparticle kinetic models. Scanning Electron Microscopy and Fourier Transform Infrared spectroscopy were used to characterize the sorbent and also to validate the adsorption mechanism.

scholarly journals The Use of Tea leaves Wastes to reduce Hexavalent Chromium Concentration in industrial Waste Water by Adsorption

2014 ◽  
Vol 11 (2) ◽  
pp. 1067-1073
Author(s):  
Baghdad Science Journal
Keyword(s):  
Waste Water ◽  
Hexavalent Chromium ◽  
Chromium Concentration ◽  
Experimental Results ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Adsorption Isotherm Models ◽  
Freundlich Adsorption Isotherm ◽  
Stirring Time ◽  
Carcinogenic Compound

Abstract : A research was conducted to study the process parameters affecting hexavalent chromium Cr (VI) (carcinogenic compound) the removal percentage from the electrical industries company waste water that contain 88 mg/l of Cr (VI) concentration by adsorption onto tea wastes. Synthetic water with 88 mg/l Cr (VI) concentration was used. Several operation parameters affecting Cr (VI) removal efficiency were investigated, such as pH, initial Cr (VI) concentration, stirring time and tea wastes dose. The experimental results reveal that maximum Cr (VI) removal reached up to 94.26% at pH of 2, stirring time of 180 minute, tea wastes dose of 8gm/100 ml and the equilibrium was attained at 180 minute. Langmuir and Freundlich adsorption isotherm models were analyzed and the experimental results fit very well with Freundlich model.

scholarly journals Adsorption of Phenol from Aqueous Solution Using Lantana camara, Forest Waste: Kinetics, Isotherm, and Thermodynamic Studies

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
C. R. Girish ◽  
V. Ramachandra Murty
Keyword(s):  
Lantana Camara ◽  
Isotherm Models ◽  
Order Model ◽  
Experimental Conditions ◽  
Batch Studies ◽  
Forest Waste ◽  
Monolayer Adsorption ◽  
Experimental Parameters ◽  
Equilibrium Data ◽  
Pseudo Second Order

The present work investigates the potential of Lantana camara, a forest waste, as an adsorbent for the phenol reduction in wastewater. Batch studies were conducted with adsorbent treated with HCl and KOH to determine the influence of various experimental parameters such as pH, contact time, adsorbent dosage, and phenol concentration. The experimental conditions were optimized for the removal of phenol from wastewater. Equilibrium isotherms for the adsorption of phenol were analyzed by Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich isotherm models. Thermodynamic parameters like the Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were also determined and they showed that the adsorption process was feasible, spontaneous, and exothermic in the temperature range of 298–328 K. The kinetic data were fitted with pseudo-second-order model. The equilibrium data that followed Langmuir model with the monolayer adsorption capacity was found to be 112.5 mg/g and 91.07 mg/g for adsorbent treated with HCl and KOH, respectively, for the concentration of phenol ranging from 25 to 250 mg/L. This indicates that the Lantana camara was a promising adsorbent for the removal of phenol from aqueous solutions.

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