Kinetics and adsorption equilibrium of some radionuclides on polyaniline/SiO2 composite

2021 ◽  
Vol 109 (2) ◽  
pp. 85-97
Author(s):  
Abeer E. Kasem ◽  
Ezzat A. Abdel-Galil ◽  
Nabil Belacy ◽  
Nagwa A. Badawy
Keyword(s):  
Adsorption Equilibrium ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Abstract The sorption kinetics and equilibrium isotherms of zirconium, uranium, and molybdenum ions onto synthetic polyaniline/SiO2 composite (PAn/SiO2) have been studied using batch-sorption techniques. This study was carried out to examine the sorption behavior of the PAn/SiO2 for the removal of Zr(IV), U(VI), and Mo(VI) ions from an aqueous solution. The influence of some parameters on the sorption process was also studied. The maximum sorption for Zr(IV), U(VI), and Mo(VI) ions was achieved at 60 min shaking time. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 24.26, 21.82, and 13.01 mg/g for Zr(IV), U(VI), and Mo(VI) ions, respectively. Kinetic modeling revealed that the sorption of all ions follows the pseudo-second-order kinetic model. The results demonstrated that both the external and intra-particular diffusion are taken into account in determining the sorption rate. Thermodynamic parameters like ΔG°, ΔH°, and ΔS° for the sorption process were evaluated. The synthetic composite has been successfully applied for the removal and recovery of U(VI) ions from real solution (monazite leachate) using a chromatographic column packed with PAn/SiO2 composite with a breakthrough capacity equal to 239.70 mg/g.

Chromate sorption and reduction kinetics onto an aminated biosorbent

2006 ◽  
Vol 54 (10) ◽  
pp. 1-8 ◽  
Author(s):  
S. Deng ◽  
Y.P. Ting ◽  
G. Yu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Penicillium Chrysogenum ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Order Kinetic ◽  
Chromium Species ◽  
X Ray ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Amine Groups

A novel biosorbent was prepared by chemically grafting of polyethylenimine (PEI) onto the fungal biomass of Penicillium chrysogenum through a two-step reaction. The modified biosorbent is favorable for the removal of anionic Cr(VI) species from aqueous solution due to the protonation of amine groups on the biomass surface. The sorption capacity for Cr(VI) increased by 7.2-fold after surface modification. Sorption kinetics results show that the pseudo-second-order kinetic model described the experimental data well. During the sorption process, X-ray photoelectron spectroscopy (XPS) was used to analyze the chromium species on the biosorbent surface and the results indicate that part of the Cr(VI) ions were reduced to Cr(III) ions which can be chelated with the amine groups on the biomass surface. The reduced Cr(III) ions formed some aggregates on the surface at higher solution pHs.

scholarly journals Uranium (VI) Recovery from Black Shale Leaching Solutions Using Ion Exchange: Kinetics and Equilibrium Studies

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 689
Author(s):  
Omirserik Baigenzhenov ◽  
Alibek Khabiyev ◽  
Brajendra Mishra ◽  
M. Deniz Turan ◽  
Merey Akbarov ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Sorption Isotherm ◽  
Room Temperature ◽  
Sorption Kinetics ◽  
Second Order ◽  
Order Kinetic ◽  
Strong Base ◽  
Maximum Sorption Capacity ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This work studies the removal of uranium ions from chemically leached solutions by sorption using two weak and two strong base anionites. Batch sorption experiments were performed to evaluate the optimum conditions at pH 1.2–2.2, 1.0 g resin dose for 1–12 h contact time at room temperature. These experiments addressed sorption kinetics and sorption isotherm. The maximum sorption capacity reached 55.8 mg/g at room temperature. The kinetics data are well described by the pseudo-second-order kinetic model at initial uranium concentration of 0.62 mg·L−1. To describe sorption kinetics pseudo-first-order, pseudo-second-order and intraparticle diffusion models were proposed. Studies indicated that the sorption of uranium can be fitted by a pseudo-second-order kinetic model very well. Equilibria were described by Langmuir, Freundlich, and Dubinin–Radushkevich equations. The experimental sorption isotherm is successfully described by the Langmuir model.

scholarly journals Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Thu Dieu Le ◽  
Luyen Thi Tran ◽  
Hue Thi Minh Dang ◽  
Thi Thu Huyen Tran ◽  
Hoang Vinh Tran
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Metal Treatment ◽  
Pseudo Second Order ◽  
Adsorption Of Co2

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg−1·min−1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (qmax) reaching 373.37 mg·g−1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

scholarly journals EFFICIENT ADSORPTION OF Ce (III) ONTO POROUS CELLULOSE/GRAPHENE OXIDE COMPOSITE MICROSPHERES PREPARED IN IONIC LIQUID

2021 ◽  
Vol 55 (9-10) ◽  
pp. 1163-1175
Author(s):  
YAN HAO ◽  
◽  
JING QU ◽  
ZUNYI LIU ◽  
SONGBO LI ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Adsorption Equilibrium ◽  
Rare Earth Ions ◽  
Order Kinetic ◽  
Oxide Composite ◽  
Composite Microspheres ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

A novel adsorbent made of porous cellulose/graphene oxide composite microspheres (PCGCM) was synthesized in [Bmim]Cl ionic liquid. The as-prepared PCGCM was evaluated for the removal of Ce (III) via static adsorption experiments. The results showed that the adsorption equilibrium of Ce (III) onto PCGCM was achieved within 50 min and the adsorption was highly pH dependent. An excellent adsorption capacity as high as 415.1 mg•g-1 was obtained at a pH of 4.9, which was much higher than most adsorbents reported in the literature. The pseudo-second order kinetic model and Langmuir isotherm model were found to fit the adsorption behavior of PCGCM well. The XPS analysis confirmed that the adsorption was based on the ion exchange mechanism. Meanwhile, PCGCM could be regenerated with 1 mol•L-1 HCl for repetitious adsorption of Ce (III). This work provides an attractive approach for the removal of rare earth ions as pollutants.

Retention behavior of anionic radionuclides using metal hydroxide sludge

2019 ◽  
Vol 107 (12) ◽  
pp. 1161-1172 ◽  
Author(s):  
Mostafa M. Hamed ◽  
I. M. Ahmed ◽  
M. Holiel
Keyword(s):  
Nuclear Power ◽  
Metal Hydroxide ◽  
Order Kinetic ◽  
Factors Affecting ◽  
Maximum Sorption Capacity ◽  
Security Issues ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Anionic Species ◽  
Pseudo Second Order

Abstract With the speedy growth of nuclear power production, the removal and disposal of radioactive nuclides such as 129I, 99Tc, 79Se, 36Cl, 93Mo, and 137Cs become major environmental security issues. Retention of these radionuclides, especially anionic species such as 129I (t1/2 1.7 × 107 years), 93Mo (t1/2 4 × 103 years) and 79Se (t1/2 3.27 × 105 years) has been challenging. 129I, 93Mo and 79Se bind very weakly to most sorbents and deposits. This study has examined the sorption potential of Metal hydroxide sludge (MHS) for 125I (t1/2 60.2 days), 99Mo (t1/2 2.75 days) and 75Se (t1/2 120 days) as a surrogate for 129I, 93Mo and 79Se, respectively. MHS has been characterized by different techniques and the factors affecting the sorption processes were investigated. The experimental data were analyzed using kinetic models and thermodynamic parameters. The results showed that the kinetics of sorption of 125I and 99Mo on MHS proceeds according to the pseudo-first-order, on the contrary of 75Se sorption follows pseudo second-order kinetic model. The maximum sorption capacity of MHS was found to be 51.2 mg/g, 46.5 mg/g and 40.2 mg/g for 125I, 99Mo and 75Se, respectively. It can be concluded that, in the case of release of anionic radionuclide species to the surroundings the MHS could act as a succeeded and economical sorbent material for retention of different anionic radionuclides such as 133, 129I, 79Se, 36Cl, 93, 99Mo, and 99Tc. To avoid the release of such anionic species from the stored nuclear wastes to the environment.

Adsorption of enrofloxacin from aqueous solution by bentonite

Clay Minerals ◽  
2013 ◽  
Vol 48 (4) ◽  
pp. 627-637 ◽  
Author(s):  
J. X. Zhang ◽  
Q. X. Zhou ◽  
W. Li
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Adsorption Equilibrium ◽  
Order Kinetic ◽  
Batch Experiments ◽  
Freundlich Model ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Better Than

AbstractThe removal of enrofloxacin, a fluoroquinolone antibiotic, from aqueous solution by adsorption onto bentonite was investigated in this study. The effects of initial concentrations, contact time and temperature on the adsorption of enrofloxacin were studied via batch experiments. The adsorption equilibrium was achieved within 60 min for all studied concentrations. The adsorption capacity increased with the increase of initial concentration within a concentration range. Higher temperatures were favourable for the adsorption. The change of Gibbs free energy (ΔG°), change of enthalpy (ΔH°) and change of entropy (ΔS°) were evaluated and the results indicate that the adsorption should be an endothermic and spontaneous process. The Langmuir isotherm model fitted to the experimental data better than the Freundlich model. The adsorption follows the pseudo-second order kinetic model.

scholarly journals Biochar from Maize Hybrid Fermentation Residuelow Cost and Efficient Heavy Metals Sorbent

2019 ◽  
Vol 26 (4) ◽  
pp. 743-757
Author(s):  
Michaela Tokarčíková ◽  
Jana Seidlerová ◽  
Oldřich Motyka ◽  
Mirka Šafaříková
Keyword(s):  
Experimental Data ◽  
Contact Time ◽  
Low Cost ◽  
Order Kinetic ◽  
Leaching Test ◽  
Maize Hybrid ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Abstract Biochar produced from fermentation residue of maize hybrid was used in untreated form as a sorbent for the removal of Cd(II), Pb(II) and Zn(II) from aqueous solution. The capability of biochar to immobilized ions was investigated by leaching test. Equilibrium between biochar sample and studied elements in solution was reached at a contact time 30 min for Zn(II) and 90 min for Pb(II) and Cd(II). The experimental data were described by pseudofirst-order and pseudo-second-order kinetic model, two- and three-parameter isotherms in non-linear form. The maximum sorption capacity achieved was 30.07 mg·g−1 in the case of Cd(II) ions, 99.44 mg·g−1 in the case of Pb(II) and 40.18 in the case of Zn(II). Biochar developed for this study is comparable to conventional biochar, low cost, non-toxic and experimental results show that is a suitable and efficient sorbent for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions.

scholarly journals Nickel (II) sorption from aqueous media by Agave salmiana as biosorbent

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
D. M. Sánchez Nava ◽  
H. López González ◽  
M. T. Olguín ◽  
S. Bulbulian
Keyword(s):  
Heavy Metal ◽  
Aqueous Media ◽  
Second Order ◽  
Order Kinetic ◽  
Sorption Data ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Agave Salmiana ◽  
Order Kinetic Model ◽  
Pseudo Second Order

In this work, the removal of nickel from aqueous solutions by Agave salmiana was investigated. For this purpose the removal of this heavy metal (Ni2+) was carried out in a batch system as a function of contact time, pH, and the initial concentration of the metallic specie in solution. The sorption data were fitted to pseudo-first order and pseudo-second order kinetic models to found the parameteres which describe the processes. It was found that the maximum sorption of the Agave for Ni2+ was at pH 10 and pseudo-second order kinetic model well described the biosorption behavior of this heavy metal by the non-living biomass. Furthermore, the maximum sorption capacity obtained from the isotherm was 10 mgNi/gAgave.

scholarly journals Adsorption of Reactive Black M-2R on Different Deacetylation Degree Chitosan

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Fang Li ◽  
Chunmei Ding
Keyword(s):  
Sorption Process ◽  
Order Kinetic ◽  
Sorption Data ◽  
Kinetic Experiment ◽  
Isotherm Equation ◽  
Degree Of Deacetylation ◽  
Deacetylation Degree ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Effects Of Temperature

Different degree of deacetylation (DD) chitosan was prepared and used for the removal of a Reactive black M-2R (RBM) from aqueous solution. The effects of temperature (298 K~323 K), chitosan dosage, degree of deacetylation on RBM removal were investigated. The adsorption equilibrium was reached within one hour. In order to determine the adsorption capacity, the sorption data were analyzed by using linear form of Langmuir, Freundlich and Tempkin isotherm equation. Langmuir equation shows higher conformity than the other two equations. From the kinetic experiment data, it was found that the sorption process follows the pseudo-second-order kinetic model. Activation energy value for sorption process was found to be 58.28 kJ mol-1. Chitosan with 66% deacetylation degree (DD) exhibited good adsorption performance for RBM. In order to determine the interactions between RBM and chitosan, FTIR analysis was also conducted.

Arsenic removal from groundwater by Anjili tree sawdust impregnated with ferric hydroxide and activated alumina

2015 ◽  
Vol 16 (1) ◽  
pp. 115-127 ◽  
Author(s):  
P. Dhanasekaran ◽  
P. M. Satya Sai ◽  
C. Anand Babu ◽  
R. Krishna Prabhu ◽  
K. K. Rajan
Keyword(s):  
Arsenic Removal ◽  
Heart Diseases ◽  
Ferric Hydroxide ◽  
Sorption Kinetics ◽  
Activated Alumina ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order ◽  
Removal Of Arsenic

Arsenic is a toxic element found naturally in groundwater. Due to its carcinogenicity, risk for heart diseases and diabetes, arsenic needs to be removed from groundwater for potable application. ‘Anjili’ tree sawdust was chemically modified with ferric hydroxide and activated alumina (SFAA) and used as an adsorbent for the removal of arsenic from groundwater. The adsorbent was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) to study the pore structure and surface functional groups. Effect of contact time, initial concentration, pH, particle size and temperature was studied. Arsenic adsorbed by SFAA followed Freundlich adsorption isotherm. Maximum sorption of arsenic by SFAA adsorbent occurred at pH 6.5. Arsenic sorption kinetics followed a pseudo-second-order model. The maximum sorption capacity at 303 K was found to be 54.32 mg/g for As(III) and 77.60 mg/g for As(V). Interference of other ions on the adsorption was in the order of PO43− > SO42− > HCO3− > NO3−.

Sign in / Sign up

Export Citation Format

Share Document