Intraparticle Diffusion Kinetic Models Research Articles

Evaluation of the effectiveness of microparticle-embedded cryogel system in removal of 17β-estradiol from aqueous solution

In this study, we have synthesized microparticle-embedded cryogel system for removal of 17β-estradiol (E2). Firstly, the poly(hydroxyethyl methacrylate-N-methacryloyl-L-tryptophan methyl ester) poly(HEMA-MATrp) microparticles were produced by emulsion polymerization. And then, poly(HEMA-MATrp) microparticles were embedded in poly(hydroxyethyl methacrylate) cryogel and [PHEMA/MATrp] cryogel system was prepared. [PHEMA/MATrp] cryogel system was used for the removal of E2. The characterization studies of the poly(HEMA-MATrp) microparticles and cryogel system were conducted by infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and swelling studies. The effects of initial concentration, temperature, and contact time on adsorption of E2 were investigated. Maximum adsorption capacity of PHEMA/MATrp cryogel was determined as 2.75 mg E2/g cryogel at 25°C. The adsorption process obeyed both pseudo-second-order and intraparticle diffusion kinetic models. All the isotherm data can be fitted Langmuir isotherm model with high correlation coefficients for all studied temperatures. Thermodynamic parameters ΔH° = 654.9 J/mol, ΔS° = 85.90 J/K/mol, and ΔG° = −23.14 to −26.23 kJ/mol with the rise in temperature from 4 to 40°C indicated that the adsorption process was endothermic and spontaneous. The E2 adsorption capacity did not change after five batch successive adsorption–desorption cycles, demonstrating the usefulness of the microparticle-embedded cryogel system in applications.

Adsorptive removal of Pb(II) ions from polluted water by newly synthesized chitosan–polyacrylonitrile blend: Equilibrium, kinetic, mechanism and thermodynamic approach

The adsorption of Pb(II) ions onto a biopolymer based composite, chitosan blended polyacrylonitrile (chitosan/PAN), has been studied in a batch mode operation. The operating parameters such as solution pH, adsorbent dose, initial Pb(II) ions concentration, contact time and temperature were experimentally optimized for the maximum removal of Pb(II) ions. The optimum conditions for the 99.82% removal of Pb(II) ions for an initial Pb(II) ions concentration of 10mg/L was found to be: chitosan/PAN blend dose of 2g/L, pH of 5.0, equilibrium time of 30min and temperature of 30̊C. The adsorption isotherm data were fitted with the different adsorption isotherm models such as Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models to know the types of adsorption process. The results of the adsorption isotherm studies were applicable to confirm that the present adsorption system was favourable and the process was physisorption. The maximum monolayer adsorption capacity of chitosan/PAN for Pb(II) ions adsorption was found to be of 20.08mg/g. The adsorption kinetics and mechanism were analyzed by pseudo-first order, pseudo-second order, intraparticle diffusion and Boyd kinetic models. The pseudo-second order kinetic model provide the best fit for Pb(II) ions-chitosan/PAN adsorption system which indicates that the adsorption process was controlled by chemisorption. The kinetic results further indicated that the adsorption process controlled was by either film or particle diffusion or both. The adsorption process was found to be of spontaneous and exothermic in nature. The overall results indicated that the prepared adsorbent may be an alternative to the already existing adsorbents.

Adsorption of Methyl orange dye from Water solutions by carboxylate group functionalized multi-walled Carbon nanotubes

The present study was carried out to investigate the potential of carboxylate group functionalized Multi-walled carbon nanotubes (MWCNT−COOH) adsorbent for the removal of Methyl orange (MO) textile dye from aqueous solutions. The effects of pH, shaking time and temperature on adsorption capacity were studied; the contact time to obtain equilibrium at 298 ˚K was fixed at 25 min. The effect of temperature on adsorption process was evaluated from 298 to 338 ˚K. Results showed that removal of Methyl orange increased with increasing contact time and decreased with increasing pH and temperature. For Methyl orange dye, the equilibrium data were best fitted to The Langmuir isotherm model. The adsorbent was characterized by infrared spectroscopy, and scanning electron microscopy. The pseudo-secondorder kinetic model provided the best fit to the experimental data compared with The Elovich or pseudo-first-order or intra-particle diffusion kinetic adsorption models.

Biosorption of lead(II) ions onto nano-sized chitosan particle blended polyvinyl alcohol (PVA): adsorption isotherms, kinetics and equilibrium studies

Lead(II) ion is one of the most toxic heavy metal present in the industrial effluents that pose many health hazards to the living environment. The current investigation aimed at synthesizing nano-sized chitosan particles and then blending them with polyvinyl alcohol (PVA) to produce a stable chitosan/PVA composite membrane. This composite proved to be a promising adsorbent for the removal of lead(II) ions from the aqueous solution. The prepared nanoparticles of chitosan were characterized using Transmission electron microscope analysis. The morphological nature and the attachment of lead ions onto the adsorbent were studied using scanning electron microscope analysis. The adsorption ability of chitosan/PVA blend was optimized by varying physical parameters such as pH, adsorbent dose, adsorbate concentration, contact time, and temperature. The maximum adsorption of 96.1% was regarded for an initial concentration of 10 mg/L, adsorbent dose of 0.6 g/100 mL at 30°C. The adsorption kinetics were studied with pseudo-first order, pseudo-second order, Weber and Morris intraparticle diffusion and Boyd kinetic models and was found that the system better fitted the pseudo-second order kinetic model. The desorption of lead(II) ions was done effectively using HCl solution, thereby proving that chitosan/PVA blend can be regenerated and reused effectively for further process of removal.

Design of batch process for preconcentration and recovery of U(VI) from liquid waste by powdered corn cobs

Sorption of uranium(VI) from aqueous solution onto powdered corn cob has been carried out using batch technique. The maximum removal (98.5%) was obtained at pH 5 and contact time 60min. Freundlich, Langmuir, Temkin and Dubinin–Radushkevich (D–R) isotherms are used for describing the sorption process. It is found that the Langmuir isotherm appears to be the best fitting model and pseudo-first order, pseudo-second order, Elovich and intraparticle diffusion kinetics models were studied. The results indicate that the process follows the pseudo-second-order kinetics model. As well as the thermodynamic data indicate that the sorption processes is exothermic. The values of enthalpy (ΔH°), mean free energy (E) and activation energy (Ea) indicate that the sorption process is physical sorption. A single stage of batch adsorber has been designed for various volumes using the Langmuir isotherm.

Bioadsorption of a reactive dye from aqueous solution by municipal solid waste

The biosorbent was obtained from municipal solid waste (MSW) of the Mostaganem city. Before use the MSW was dried in air for three days and washed several times. The sorption of yellow procion reactive dye MX-3R onto biomass from aqueous solution was investigated as function of pH, contact time and temperature. The adsorption capacity of MX-3R was 45.84mg/g at pH 2–3 and room temperature. MX-3R adsorption decreases with increasing temperature. The Langmuir, Freundlich and Langmuir–Freundlich adsorption models were applied to describe the related isotherms. Langmuir–Freundlich equation has shown the best fitting with the experimental data. The pseudo first-order, pseudo second-order and intra-particle diffusion kinetic models were used to describe the kinetic sorption. The results clearly showed that the adsorption of MX-3R onto biosorbent followed the pseudo second-order model. The enthalpy (ΔH°), entropy (ΔS°) and Gibbs free energy (ΔG°) changes of adsorption were calculated. The results indicated that the adsorption of MX-3R occurs spontaneously as an exothermic process.

Equilibrium and kinetics studies of hexavalent chromium biosorption on a novel green macroalgae Enteromorpha sp.

This study focuses on the use of novel Enteromorpha sp. macroalgal biomass (EMAB), for the biosorption of hexavalent chromium from aqueous solutions. The biosorbent was characterized by Fourier transformer infrared spectroscopy, energy dispersive spectroscopy, and scanning electron microscopy techniques. The effect of experimental parameters such as pH, initial concentration of Cr(VI) ions, biosorbent dosage, and temperature were evaluated. The maximum biosorption capacity for Cr(VI) was observed at pH 2.0. The modeling of the experimental data at equilibrium was performed using two parameter isotherm models. Both Langmuir and Freundlich isotherm equations better fitted the equilibrium data. A contact time of different initial Cr(VI) concentrations was about 160 min to attain biosorption equilibrium. The kinetic data were fitted by models including pseudo-first-order, pseudo-second-order, and intraparticle diffusion. The pseudo-second-order and intraparticle diffusion kinetic models adequately described the kinetic data. Moreover, the thermodynamic parameters indicated that the biosorption process was spontaneous, endothermic, and increased randomness in nature. The results showed that EMAB could be used as an effective biosorbent for the removal of Cr(VI) from aqueous solution.

A kinetic study on cadmium adsorption from aqueous solutions by pre-conditioned phosphogypsum

In the present study, the effect of contact time, adsorbent dosage, and initial cadmium concentration on the adsorption of Cd(II) ions from aqueous solutions by pre-conditioned phosphogypsum was investigated. The kinetics of adsorption was studied and, pseudo-first-order, pseudo-second-order, and Elovich models were used to fit the experimental data, which was obtained from batch experiments. The kinetic adsorption data fitted well into the second-order kinetic model. Adsorption mechanism was explained with the intraparticle diffusion and Boyd kinetic models.

Comparative study of the kinetics and equilibrium of nickel(II) biosorption from aqueous solutions by free and immobilized biomass of Aspergillus awamori

In this research, the kinetics and equilibrium of nickel(II) biosorption were studied in aqueous solutions using batch technique. The biosorption was carried on Ca‐alginate beads, on nonliving mycelium of Aspergillus awamori immobilized on Ca‐alginate, and on free fungal biomass. The biosorbents were characterized by FTIR and SEM analyses. The experimental data were analyzed in terms of pseudo‐first‐order, pseudo‐second‐order, and intraparticle diffusion kinetic models. It was observed that the biosorption process of Ni(II) ions followed well pseudo‐second‐order model on all biosorbents. The experimental results showed that biosorption equilibrium on blank Ca‐alginate, free biomass, and immobilized fungal biomass fit better to the Langmuir model when compared with the Freundlich model in concentration range studied (25–75 mg L−1). The results showed that the maximum monolayer biosorption capacity of the immobilized fungal biosorbent was 8.34 mg g−1 when compared with the blank Ca‐alginate and free biomass with 4.63 and 7.13 mg g−1, respectively. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1356–1364, 2015

Synthesis of hydroxyapatite/clay and hydroxyapatite/pumice composites for tetracycline removal from aqueous solutions

Synthesized hydroxyapatite/clay (HA-C) and hydroxyapatite/pumice (HA-P) composites were used for tetracycline (TC) uptake studies from aqueous solution and their uptake capacities were compared. HA-C and HA-P composites were synthesized by precipitation method and the structures of the synthesized composites were characterized by XRD, SEM and BET analyses. Cation exchange capacities of HA-C and HA-P were found to be 84meq/100g and 33meq/100g, respectively. The TC adsorption using HA-C and HA-P was studied on batch mode. Various parameters such as contact time, solution pH, initial TC concentration, composite dosage, salinity and temperature were optimized. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models were applied to the equilibrium data. The maximum adsorption capacity onto HA-C was found to be 76.02mg/g and about four times larger than the adsorption capacity of the HA-P (17.87mg/g). The results indicated that the TC uptake onto HA-C and HA-P composites is mainly by a surface complexation and ion-exchange mechanism which depend on the solution pH. The calculated values of thermodynamic parameters indicated that the TC adsorption is favorable, physicochemical in nature. The sorption process follows pseudo-second-order and intraparticle diffusion kinetic models. The TC adsorption mechanism by HA-C and HA-P has been proposed.

Optimization, equilibrium, kinetic, thermodynamic and desorption studies on the sorption of Cu(II) from an aqueous solution using marine green algae: Halimeda gracilis

The aptitude of marine green algae Helimeda gracilis for sorption of Cu(II) ions from an aqueous solution was studied in batch experiments. The effect of relevant parameters such as function of pH, sorbent dosage, agitation speed and contact time was evaluated by using Response surface methodology (RSM). A maximum percentage removal of Cu (II) by Halimeda gracilis occurs at pH-4.49, sorbent dosage–1.98g/L, agitation speed–119.43rpm and contact time–60.21min. Further, the sorbent was characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning electron microscope (SEM) analysis. Experimental data were analyzed in terms of pseudo-first order, pseudo-second order, intraparticle diffusion, power function and elovich kinetic models. The results showed that the sorption process of Cu(II) ions followed well pseudo-second order kinetics. The sorption data of Cu(II) ions at 308.15K are fitted to Langmuir, Freundlich, Dubinin–Radushkevich (D–R), Temkin, Sips and Toth isotherms. Sorption of Cu(II) onto marine green algae Helimeda gracilis followed the Langmuir and Toth isotherm models (R2=0.998 and R2=0.999) with the maximum sorption capacity of 38.46 and 38.07mg/g. The calculated thermodynamic parameters such as ΔG°, ΔH° and ΔS° showed that the sorption of Cu(II) ions onto Helimeda gracilis biomass was feasible, spontaneous and endothermic. Desorption study shows that the sorbent could be regenerated using 0.2M HCl solution, with up to 89% recovery.

Biosorption of Cr(VI) ions from aqueous solutions by a newly isolated Bosea sp. strain Zer-1 from soil samples of a refuse processing plant.

The adsorption behavior of Cr(VI) ions from aqueous solution by a chromium-tolerant strain was studied through batch experiments. An isolate designated Zer-1 was identified as a species of Bosea on the basis of 16S rRNA results. It showed a maximum resistance to 550 mg·L(-1) Cr(VI). The effects of 3 important operating parameters, initial solution pH, initial Cr(VI) concentration, and biomass dose, were investigated by central composite design. On the basis of response surface methodology results, maximal removal efficiency of Cr(VI) was achieved under the following conditions: pH, 2.0; initial concentration of metal ions, 55 mg·L(-1); and biomass dose, 2.0 g·L(-1). Under the optimal conditions, the maximum removal efficiency of Cr(VI) ions was found to be nearly 98%. The experimental data exhibited a better fit with the Langmuir model than the Freundlich model. The biosorption mechanisms were investigated with pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics models. These results revealed that biosorption of Cr(VI) onto bacterial biomass could be an alternative method for the removal of metal ions from aqueous solution.

Potential Application of Periwinkle Shell Ash as Photocatalyst for the Heterogeneous Photocatalytic Decolourisation of Congo Red Dye in Aqueous Solution

The potential of locally sourced periwinkle shell ash (PSA) has been explored as an alternative photocatalyst for the photocatalytic decolourisation of Congo red dye. The effect of process parameters such as irradiation time, initial dye concentration, catalyst dosage, pH of the solution and the addition of hydrogen peroxide (H 2 O 2 ) on the extent of photodegradation was investigated. The optimum values of the process parameters were: irradiation time, 50 minutes; initial dye concentration, 10 mg/L; PSA dosage, 7 g/L and pH, 4. The addition of H 2 O 2 enhanced the photodegradation process with almost 100 percent decolourisation achieved. The adsorption equilibrium was well described by the Langmuir isotherm equation (R 2 =0.999) indicating mono layer type adsorption while the diffusion mechanism and kinetics of the process were well described by the intra-particle diffusion and Langmuir-Hinshelwood kinetic models with high R 2 values of 0.998 and 0.999 respectively.

Assessment of the adsorptive color removal of methylene blue dye from water by activated carbon sorbent-immobilized-sodium decyl sulfate surfactant

Sodium decyl sulfate (SDeS) as an anionic surfactant was used for the surface modification of activated carbon (AC). Micelle-like structure was formed on the surface of AC sorbent-modified surfactant (AC-SDeS). The modified sorbent was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and thermal gravimetric analysis. The AC-SDeS sorbent was proved to have high enhanced removal capability for methylene blue (MB), a cationic dye, from various water matrices. The adsorptive removal process of MB dye was investigated and monitored using the batch equilibrium technique. Adsorptive removal of MB dye by AC-SDeS sorbent was examined in presence of various controlling parameters such as pH, contact time, sorbent dosage, initial dye concentration, and different interfering substances. The results showed that the optimum pH range for removal of MB dye from aqueous solutions (120 mg L−1) is pH 7.0–13.0 and the determined percentage values of removal were 92.25–94.50%. The percentage of dye removal decreased upon increasing the initial dye concentration and addition of interfering substances. The Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich adsorption models were applied to describe the equilibrium isotherms, and the experimental data were found to agree with the Langmuir isotherm model. The pseudo first-order, pseudo-second-order, intraparticle diffusion and Elovich kinetic models were used to examine the kinetic data and determine the rate constants. The results were found to fit well with the pseudo-second-order kinetic model. The efficiency of AC-SDeS for adsorptive removal of MB dye from tap water and real wastewater was also studied and excellent results were obtained as 95.90–96.20 ± 2.0–4.0%.

Removal of cationic dyes by poly(AA-co-AMPS)/montmorillonite nanocomposite hydrogel

In this work, adsorption feasibility of a cationic dye, methylene blue (MB), onto an anionic hydrogel nanocomposite was investigated in detail. Firstly, the hydrogel nanocomposite was synthesized via a simple solution copolymerization of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid monomers in the presence of montmorillonite (MMT) by using ammonium persulfate as an initiator and methylene bisacrylamide as a crosslinker. Then, the effects of agitation time, MMT content, pH, initial dye concentration, adsorbent dose, and temperature were optimized with respect to the dye adsorption capacity of nanocomposites. The thermodynamic parameters such as changes in standard free energy, enthalpy, and entropy demonstrated that dye adsorption onto the hydrogel nanocomposite was spontaneous and endothermic, and especially more effective at high temperatures. Moreover, the results indicated that the equilibrium adsorption isotherm data of the hydrogel nanocomposite better fit to the Redlich–Peterson than to the Langmuir, Freundlich, and Temkin models. The experimental results also fit to pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models. The results indicated that the adsorption of MB followed pseudo-second-order kinetics.

Modification of commercial activated carbon for the removal of 2,4-dichlorophenol from simulated wastewater

In this study, modification of commercial activated carbon (AC) has been examined for the removal of 2,4-dichlorophenol (2,4-DCP) from aqueous solutions. The modified process involves impregnation of phosphoric acid at ratios of 0.6–2.4 followed by 500°C and 700°C for 2h. The effect of different impregnation ratios and activation temperatures was studied. Physical and chemical characterization of modified AC was conducted including percentage yield, moisture content, ash content, pH, morphology study and functional groups. The adsorption of 2,4-DCP by modified AC was also investigated. Various tests were conducted on the unmodified AC and chemically modified AC at different contact times (5–60min) and adsorbent dosages (0.1–0.9g). Results revealed that the modified AC (AC2) prepared with impregnation ratio, Xp value of 1.2 at 500°C for 2h was found to have the highest percentage removal of 2,4-DCP (50ppm), which is 93.63%. The modified AC showed better capability to adsorb 2,4-DCP from aqueous solutions, the percentage removal was improved to 20.40%. Elovich and intraparticle diffusion kinetic models were used to test the adsorption kinetics. The adsorption of 2,4-DCP proved to fit better in the intraparticle diffusion model compared to Elovich equation. The mechanism of the adsorption process was determined by the intraparticle model.

REMOVAL OF 2,4 DICHLOROPHENOL FROM WASTEWATER ON COST-EFFECTIVE SORBENTS: KINETICS AND THERMODYNAMICS INVESTIGATIONS

Maximum removal (94 1.2%) of 2, 4 dichlorophenol (50 mg.dm-3) was achieved on silica with agitation of 4 hours, at pH 8 and 42 C. The positive enthalpy (.H) and negative free energy values (.G315K) suggested the endothermic and a spontaneous nature of sorption. The free energy of the process at all temperature was negative and increased with the increase in temperature. The values of free energy suggested a spontaneous process where the spontaneity decreased with the rise in temperature. Positive values of .S described the randomness and a greater stability of sorption process with no structural changes at the solid-solution interface during the sorption. The data was subjected to Freundlich and Langmuir isotherms and the values of qe (mg.g-1), K1,ads and K2,ads(min-1) demonstrated that pseudo first order model was not fit for process, whereas, the pseudo second order kinetic model was best to describe the kinetics of process. The Elovich model and Intra particle diffusion kinetic model graph were best to describe the kinetics for DCP. A comparative experimental data revealed that developed method might be employed for removal of DCP from the aqueous industrial effluents before discharging them into water bodies.

Equilibrium and Kinetics Behavior of Oil Spill Process onto Synthesized Nano-Activated Carbon

Oil spills were removed from polluted wastewater using synthetic nano-activated carbon that prepared through the alkaline activation of water hyacinth roots followed by zinc chloride treatment prior to its carbonization. The prepared nano-activated carbon attains high oil sorption capacity of 28.31 g oil/ g sorbent and no water pickup. The SEM examination of the prepared activated carbon investigates its spherical morphological structure with average diameter of 60nm. The different processing parameters affecting on the oil sorption onto the prepared nano-activated carbon were optimized. The maximum oil sorption capacity of 30.2 g oil/g activated carbon has been recorded after 60 min sorption time using 10 g from the prepared nano-activated carbon at initial oil film thickness of 1 mm. The oil sorption data recorded at equilibrium conditions have been analyzed using the linear forms of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherm models and the applicability of these isotherm equations to the sorption system was compared by judging the correlation coefficients, R2. It was established that the equilibrium isotherm models applicability follows the order of: Freundlich< Langmuir< Dubinin-Radushkevich for the oil sorption onto activated carbon. Accordingly, the oil sorption process at equilibrium may be described mainly using both Freundlich and Langmuir isotherms. These results give prediction that the oil sorption process takes place onto nano-activated carbon as mono-layer coverage with some degree of heterogeneity. The kinetics of the oil sorption process was modeled using four kinetic models namely pseudo first-order, pseudo second-order, Elovich, and intraparticle diffusion kinetic models. The pseudo second-order model yielded the highest R2 value of 0.9933. So, the kinetics of the oil sorption process onto the prepared nano-activated carbon may be described as second-order, which reveals that the main oil adsorption mechanism is probably chemisorption reaction.

Sorption of cadmium ions from saline waters onto Fe(III)-zeolite

The sorption of Cd2+ from natural seawater, artificial seawater, distilled water and NaCl solution of the same ionic strength as the seawater onto zeolite modified by iron(III) oxide (Fe(III)-zeolite) was investigated. The sorption was found to be time, concentration and pH dependent. The sorption capacity at the initial pH = 7 decreased in the following order: distilled water &gt; NaCl solution &gt; artificial seawater &gt; natural seawater. The isotherm study showed that Langmuir isotherm model could be adequately applied for the sorption in distilled water, indicating the homogeneous monolayer coverage at Fe(III)-zeolite surface, while the Freundlich isotherm model showed a better fit than the Langmuir model of the sorption data in saline waters, indicating multilayer heterogeneous coverage at the sorbent surface. The values of Freundlich parameter n suggested that the sorption was a favorable process and bonds between Cd2+ and Fe(III)-zeolite surface were stronger in NaCl solution than in natural and artificial seawater. Kinetics analyzes showed that the mechanism of Cd2+ sorption from natural seawater differed from the sorption mechanism out of distilled water, NaCl solution and artificial seawater. The intra-particle diffusion kinetic model indicated that both boundary layer diffusion and intra-particle diffusion influenced the rate of sorption.

Kinetic, equilibrium and thermodynamic studies on sorption of uranium and thorium from aqueous solutions by a selective impregnated resin containing carminic acid

In this work, the removal of uranium and thorium ions from aqueous solutions was studied by solid–liquid extraction using an advantageous extractant-impregnated resin (EIR) prepared by loading carminic acid (CA) onto Amberlite XAD-16 resin beads. Batch sorption experiments using CA/XAD-16 beads for the removal of U(VI) and Th(IV) ions were carried out as a function of several parameters, like equilibration time, metal ion concentration, etc. The equilibrium data obtained from the sorption experiments were adjusted to the Langmuir isotherm model and the calculated maximum sorption capacities in terms of monolayer sorption were in agreement with those obtained from the experiments. The experimental data on the sorption behavior of both metal ions onto the EIR beads fitted well in both Bangham and intra-particle diffusion kinetic models, indicating that the intra-particle diffusion is the rate-controlling step. The thermodynamic studies at different temperatures revealed the feasibility and the spontaneous nature of the sorption process for both uranium and thorium ions.