scholarly journals Recovery of Vanadium (V) Oxyanions by a Magnetic Macroporous Copolymer Nanocomposite Sorbent

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1777
Author(s):  
Ljiljana Suručić ◽  
Tamara Tadić ◽  
Goran Janjić ◽  
Bojana Marković ◽  
Aleksandra Nastasović ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Active Sites ◽  
Aqueous Media ◽  
Sorption Process ◽  
Chemical Modeling ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Surface Active ◽  
Ph Range ◽  
Macroporous Copolymer

An amino-functionalized magnetic macroporous copolymer of glycidyl methacrylate (GM) and ethylene glycol (E) dimethacrylate (m-poly(GME)-deta) was synthesized, fully characterized, and used to investigate the adsorption of vanadium (V) oxyanions from aqueous solutions (Ci = 0.5 mM) in a batch system at room temperature (298 K). Pseudo-first-order (PFO), pseudo-second-order (PSO), Elovich, and intra-particle diffusion (IPD) models were used to analyze the kinetic data. The study showed that sorption is rapid, i.e., the sorption half-time is approximately one minute. Initially, the sorption process primarily involved surface sorbent particles, and it was best described by the PSO model. However, after saturation of the surface active sites is attained, the sorption rate decreases significantly because of limitations of the diffusion rate, which is then primarily controlled by the IPD process. The sorption process is favorable in the pH range of 3–6 due to the strong electrostatic interactions between the absorption centers of copolymer and vanadium (V) oxyanions. In the stated pH range, deta absorption centers with two and three protonated N atoms are in equilibrium as studied by quantum chemical modeling. Among V(V) species present in diluted aqueous media, the adsorption of H2VO4− ions dominates.

scholarly journals Dual Functional Composite of Montmorillonite-Rich/Chitosan (MCC) for Decolorizing the Water Used in Joss Paper Process: Thermodynamic, Isotherm, and Kinetic Studies

2020 ◽  
Vol 10 (21) ◽  
pp. 7493
Author(s):  
Witsarut Muangrak ◽  
Nutthavich Thouchprasitchai ◽  
Yuththaphan Phongboonchoo ◽  
Sangobtip Pongstabodee
Keyword(s):  
Active Sites ◽  
Dye Removal ◽  
Adsorption Process ◽  
Kinetic Studies ◽  
Dual Functional ◽  
Rate Limiting Step ◽  
Wide Ph Range ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Ph Range

A hybrid montmorillonite (Mt)-rich/chitosan composite (MCC) with high adsorption performance was synthesized for the decolorization of water used in the joss paper process. The performance was reported in terms of the dye removal. The composite expressed higher performance than chitosan or Mt-rich clay, respectively. The optimum condition for complete dye removal was achieved when using at least 0.6 g of the composite over a wide pH range (3–10) and initial dye concentration (10–100 mg L−1). The composite showed good reusability without the requirement of regeneration, adsorbing the dye completely for up to eight successive cycles of adsorption (>1.33 gdye gMCC−1). Thermodynamic analyses revealed the degree of spontaneity and the endothermic adsorption process. From the isotherm studies, the Koble–Corrigan isotherm model fitted very well to the experimental data, revealing that the composite had a heterogeneous surface with various active sites to adsorb the dye molecules. This also evidenced the synergistic electrostatic attraction and hydrophobic interaction between the dye and the composite. The pseudo-second-order model best explained the kinetic rate of adsorption. From evaluation of the adsorption process using the Webber and Morris equation and Boyd model, the rate-limiting step consisted of film diffusion and intra-particle diffusion.

scholarly journals Biosorption of aniline blue from aqueous solution using a novel biosorbent Zizyphus oenoplia seeds: Modeling studies

2015 ◽  
Vol 17 (3) ◽  
pp. 70-77 ◽  
Author(s):  
M. Kumar ◽  
G. Elangovan ◽  
R. Tamilarasan ◽  
G. Vijayakumar ◽  
P.C. Mukeshkumar ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Sorption Process ◽  
Aniline Blue ◽  
Blue Dye ◽  
Batch Mode ◽  
Before And After ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Isotherm Equations

Abstract This article presents the feasibility for the removal of Aniline Blue dye (AB dye) from aqueous solution using a low cost biosorbent material Zizyphus oenoplia seeds. In this study, a batch mode experiments of the adsorption process were carried out as a function of pH, contact time, concentration of dye, adsorbent dosage and temperature. The experimental data were fitted with Freundlich and Langmuir isotherm equations. The feasibility of the isotherm was evaluated with dimensionless separation factor (RL). The kinetic data of sorption process are evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion process was evaluated with intra-particle diffusion model. The thermodynamic parameters like change in enthalpy (ΔHº); change in entropy (ΔSº) and Gibbs free energy change (ΔGº) were calculated using Van’t Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology was identified with Scanning Electron Microscope (SEM) in before and after adsorption of AB dye.

BSA Adsorption on Hydroxyapatite after Thermal Treatment

2007 ◽  
Vol 361-363 ◽  
pp. 127-130 ◽  
Author(s):  
Elena Mavropoulos ◽  
Nilce C.C. da Rocha ◽  
Maria Helena M. Rocha-Leão ◽  
Antonella M. Rossi
Keyword(s):  
Thermal Treatment ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Phosphate Buffer ◽  
Bovine Serum ◽  
Active Sites ◽  
Sorption Process ◽  
Buffer Concentration ◽  
Surface Active ◽  
Bsa Adsorption

Adsorption experiments of bovine serum albumin on hydroxyapatite previously annealed at temperatures up to 1100°C was performed at 37°C and phosphate buffer, pH 6.0. Kinetic process was very efficient and irreversible for low phosphate buffer concentration. Thermal treatment contributed to the decrease of bovine serum albumin immobilization indicating that sorption process depended on HA specific surface area and the number of surface active sites. However, it was verified that particle size was also an important parameter for bovine serum albumin immobilization.

Application of the intra-particle diffusion model for activated carbon fibers in an aqueous medium

2012 ◽  
Vol 1373 ◽  
Author(s):  
Teresa Ramírez-Rodríguez ◽  
Fray de Landa Castillo-Alvarado
Keyword(s):  
Activated Carbon ◽  
Diffusion Model ◽  
Carbon Fibers ◽  
Aqueous Media ◽  
Particle Diffusion ◽  
Activated Carbon Fibers ◽  
Kinetics Of Adsorption ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Kinetics Of

ABSTRACTThe intra-particle diffusion model (IPD), proposed by Weber and Morris has been applied to the analysis of the kinetics of adsorption on activated carbon fibers with phosphate groups in the removal of cadmium ions in aqueous media. It is evident that the removal of cadmium ion kinetic model of pseudo-second order provides a better fit than the model of pseudo-first order and the intra-particle diffusion model provides the best to the sample compared activating solution: grams fibers of 1:3.

Facile Synthesis of Novel Carboxymethyl-Chitosan/Sodium Alginate Grafted with Amino-Carbamate Moiety/Bentonite Clay Composite for Effective Biosorption of Ni (II) from Aqueous Solution

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hamza Shehzad ◽  
Ejaz Ahmed ◽  
Muhammad Imran Din ◽  
Zahoor H. Farooqi ◽  
Muhammad Arshad ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Aqueous Media ◽  
Bentonite Clay ◽  
Cost Effective ◽  
Sorption Process ◽  
Carboxymethyl Chitosan ◽  
Sorption Data ◽  
Hydrogel Beads ◽  
Pseudo Second Order ◽  
Order Rate Equation

AbstractIn the present study, a novel biosorbent clay composite, based on carboxymethyl-chitosan/sodium alginate grafted with amino-carbamate moiety/bentonite clay (CA-CMC/Bt) was prepared. The produced sorbent was conditioned in the form of hydrogel beads by ionotropic gelation with Ca(II) ions, and thoroughly characterized using FTIR, XRF, XRD, SEM and zeta potential measurements. FTIR and SEM confirmed the successful grafting and intercalation of clay mineral into modified biopolymer. Hydrogel beads were observed to be very integrated and stable under a wide pH working range (from 2.0 to 12.0). CA-CMC/Bt was employed for adsorptive remediation of Ni(II) from aqueous media. Sorption process was found as a function of various parameters such as sorbent dosage, contact time, pH and initial concentration. Kinetic data could be well explained by pseudo second order rate equation (PSORE), suggesting that complexation or valence forces are playing significant role in the uptake of Ni(II) ions. Isothermal sorption data was analysed using different sorption models such as Langmuir, Freundlich and Sips. Data was well fitted with Langmuir and Sips model, maximum monolayer sorption capacity (qm) was calculated (by non-linear fitting of data) as 159 mg/g at 298 K and pH 5.5. Separation factor (RL) was found as 0 < RL < 1 which indicated favourable sorption. Thermodynamic parameters i.e. ΔGo, ΔHo and ΔSo were quantified and patterned the sorption process as exothermic, spontaneous with increase in system entropy. CA-CMC/Bt was found cost-effective, efficient and reusable material in Ni(II) competitive recovery.

scholarly journals Kinetic, equilibrium and thermodynamic studies of Ni(II) ions sorption on sulfuric acid treated Lagenaria vulgaris shell

2016 ◽  
Vol 22 (3) ◽  
pp. 235-247 ◽  
Author(s):  
Danijela Bojic ◽  
Goran Nikolic ◽  
Jelena Mitrovic ◽  
Miljana Radovic ◽  
Milica Petrovic ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Significant Loss ◽  
Isotherm Models ◽  
Pseudo Second Order ◽  
Na Ions ◽  
Ph Range ◽  
Rate Limiting ◽  
Lagenaria Vulgaris

Chemically modified Lagenaria vulgaris shell (ccLVB) was tested as a new sorbent for the removal of Ni(II) from aqueous solution, in batch conditions. The sorption process was very fast reaching equilibrium in about 20 min. Ni(II) sorption is almost invariant in the pH range from 3 to 6. Sorption kinetics followed pseudo-second order, intraparticle diffusion and Chrastil?s models, which suggest that both surface reaction and diffusion were the rate-limiting steps. Equilibria experimental results are well fitted by Langmuir and Temkin sorption isotherm models, indicating mixed adsorption process. The maximum biosorption capacity of ccLVB for Ni(II) was found to be 84.51 mg g-1. The calculated thermodynamic parameters showed that the biosorption of nickel on ccLVB was feasible, spontaneous and exothermic at 25-45?C. The desorption experiments showed that the ccLVB could be reused for five cycles without significant loss in sorption capacity. Release of Na+ ions from the biosorbent during sorption of Ni(II) reveals that the main sorption mechanism is ion exchange. Presented study suggests that ccLVB can be used effectively for the removal of Ni(II) ions from aqueous solution.

scholarly journals Simultaneous sorption of heavy metals on Algerian Bentonite: mechanism study

2021 ◽  
Author(s):  
Radhia Yous ◽  
Razika Khalladi ◽  
Hakima Cherifi
Keyword(s):  
Heavy Metals ◽  
Electrostatic Interactions ◽  
Sorption Process ◽  
Underground Water ◽  
Second Order ◽  
Mechanism Study ◽  
Order Model ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Simultaneous Sorption

Abstract Industrialization has induced tremendous environmental problems, particularly surface and underground water pollution by harmful heavy metals. In this work, we attempt to eliminate simultaneously iron and cadmium from aqueous solutions by adsorption on Algerian Bentonite. This abundant material was used without any modification. The sorption mechanism was investigated, and effects of pH, initial adsorbate and adsorbent concentrations were studied. The kinetics study revealed that equilibrium was reached after 120 min for both metals, and maximal adsorbed quantities of cadmium (76 mg/g) and iron (55 mg/g ) were obtained at pH = 10 and 8 respectively. Different kinetic models were tested, such as pseudo first-order, pseudo second-order, film and intraparticle diffusion models. The pseudo second-order model fits well the experimental data. Biot number values (2–39) show that the simultaneous sorption process is controlled by film diffusion due to electrostatic interactions between negatively charged surface and cations, then by the internal diffusion and formation of bonds between cations and adsorbent constituents. Also, compared to iron the high and rapid sorption of cadmium reflects the selective nature of the sorption process. These results show that raw bentonite could be used without further treatment as an efficient sorbent for heavy metals mixture.

Experimental and Modeling Studies of Sorption of Tetracycline onto Zeolite in the Presence of Copper(II)

2012 ◽  
Vol 512-515 ◽  
pp. 2355-2360 ◽  
Author(s):  
Hong Huang ◽  
Yan Li Zou ◽  
Ya Nan Li
Keyword(s):  
Removal Rate ◽  
Sorption Process ◽  
Order Kinetic ◽  
Adsorption Removal ◽  
Intra Particle Diffusion ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Equilibrium Process ◽  
Presence And Absence ◽  
Rate Limiting

The sorption performance of tetracycline on zeolite under different conditions was investigated in presence and absence of Cu(Ⅱ).The presence of Cu(Ⅱ) greatly increased the adsorption of tetracycline on zeolite. Adsorption kinetics and adsorption equilibrium isotherms were studied by conducting series of batch experiments. The kinetic analysis indicated that the pseudo-second-order kinetic model was well described the sorption equilibrium process of tetracycline onto zeolite in the presence and absence of Cu(Ⅱ), and intra-particle diffusion was not the only rate-limiting in the sorption process. The qmax value calculated from Langmuir model were 17.37 and 68.26 mg/g in the absence and the presence of Cu(Ⅱ). The value of E calculated from Dubinin-Radushkevich (D-R) model confirmed that the adsorption in the absence and presence of Cu(Ⅱ) were mainly controlled by physical combined with chemical adsorption mechanism. The tetracycline sorption amount decreased in the absence of Cu(Ⅱ) and increased in the presence of Cu(Ⅱ) as the pH increasing. The adsorption removal rate of wastewater containing 0.1 mmol/L tetracycline was 95.5% in the presence of Cu(Ⅱ) and 34.5% in the absence of Cu(Ⅱ) when the dosage of zeolite was 0.05g.

scholarly journals The adsorption of Mn(II) by insolubilized humic acid

2020 ◽  
Vol 82 (4) ◽  
pp. 747-758
Author(s):  
Wenlin Zhao ◽  
Bozhi Ren ◽  
Andrew Hursthouse ◽  
Feng Jiang
Keyword(s):  
Humic Acid ◽  
Ph Value ◽  
Sorption Process ◽  
Maximum Adsorption Capacity ◽  
Electron Pairs ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Adsorption Kinetic Model ◽  
Langmuir And Freundlich Models ◽  
Physical Reaction

Abstract The eco-friendly and non-toxic natural organic substance, insolubilized humic acid (IHA), was used to remove Mn(II) from aqueous solutions. The adsorption characteristics were studied through a series of static adsorption tests. The results show that conditions such as the dose, the pH of the solution and the initial concentration of Mn(II) all affect removal efficiency, and the optimal pH value was 5.5. The sorption process for Mn(II) on IHA conforms to the pseudo-second-order adsorption kinetic model and intra-particle diffusion is not the only factor affecting the adsorption rate. Both Langmuir and Freundlich models can describe this adsorption behavior, and the experimental maximum adsorption capacity of IHA was 52.87 mg/g under optimal conditions. The thermodynamic analysis of adsorption shows that the adsorption process is a non-spontaneous endothermic physical reaction. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) were used to characterize the samples, it was found that as IHA successfully adsorbed Mn(II), the surface morphology of IHA changed after the adsorption reaction. The adsorption mechanism for Mn(II) on IHA is to provide electron pairs for carboxyl, phenolic hydroxyl and other functional groups to form stable complexes with Mn(II).

scholarly journals Equilibrium, thermodynamic and kinetic studies to study the sorption of rhodamine-b by moroccan clay

2013 ◽  
Vol 15 (4) ◽  
pp. 542-550 ◽  
Keyword(s):  
Rhodamine B ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Contaminated Water ◽  
Equilibrium Thermodynamic ◽  
Order Model ◽  
Sorption Data ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Rate Controlling Step

<p>This study aimed to evaluate the sorption capability of an inexpensive and easily available Moroccan clay, called locally Ghassoul, to remove Rhodamine B (Rh-B) from aqueous solution. Experimental results showed that the equilibrium sorption data fitted well with the Langmuir isotherm and the monolayer sorption capacity was estimated as 448 mg g-1 at 298K. Kinetic analyses showed that the sorption rate was more accurately represented by a pseudo second-order model. The intra-particle diffusion was involved in the overall rate of the sorption process but it was not the only rate-controlling step. The calculated thermodynamics parameters showed the spontaneous and the endothermic nature of the sorption process. The activation energy found to be 5.36 kJ mol-1 could indicate a physical sorption process. The obtained results confirmed the applicability of this clay as an efficient and economical adsorbent for cationic dyes from contaminated water.</p>

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