Redlich-Peterson Isotherm Equations Research Articles

Highly Porous Carbon Materials Prepared Through KOH‐Assisted CO2‐Activation of Carbonized Waste Tires for Removal of Cr(VI) and Cd(II) from Water

AbstractIn this study, waste tires (WTs) were carbonized under an N2 atmosphere. Subsequently, KOH/WTs‐char with KOH‐assisted CO2 activation was used to prepare activated carbon (AC) as a highly porous carbon material for the removal of Cr(VI) and Cd(II) from water. Various techniques such as elemental analysis, Fourier‐transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption/desorption were employed to investigate the physical and chemical characteristics of the prepared carbons. The WTs‐char activated with KOH under CO2 exhibited a microstructure with a high BET surface area and pore volume of 1841 m2/g and 0.869 cm3/g, respectively, demonstrating excellent adsorbent performance. The maximum removal efficiencies of 99.91 % for Cd(II) and 99.81 % for Cr(VI) were achieved using AC2 carbon under the following conditions: pH 2 for Cr(VI) and pH 5 for Cd(II), contact time of 120 min, adsorbent dose of 0.4 g/100 mL, and temperature of 298 K. The adsorption kinetics followed the pseudo‐second‐order equation, and the equilibrium data fit well with the Redlich–Peterson isotherm equation. The positive values of ▵G indicated that the uptake process for both ions was nonspontaneous and nonfeasible over the temperature studied. Both ions showed negative values of ΔH and ΔS on carbon, suggesting exothermic adsorption and a decrease in disorder. Regeneration studies showed that NaOH was a better desorbing agent than HCl. Cr(VI) desorption resulted in over 90 % removal recovery by AC2 using 1.0 M NaOH even after the fifth cycle. However, the low activation energy indicated that the adsorption was favorable kinetically. Overall, this study demonstrated the effective preparation of highly porous carbon and its successful performance in removing Cr(VI) and Cd(II) ions.

The Adsorption of Pb(II) from Aqueous Solution Using KOH-Modified Banana Peel Hydrothermal Carbon: Adsorption Properties and Mechanistic Studies.

Adopting banana peel as a raw material, the adsorption properties of banana peel hydrothermal carbon modified with a KOH solution for lead ions in aqueous solution were studied. The surface structure and functional groups of the modified hydrothermal carbon were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, the Brunner-Emmet-Teller (BET) method, element analysis, and Raman spectroscopy. The results showed that an adsorption capacity of 42.92 mg/g and a removal rate of 86.84% were achieved when the banana peel hydrothermal carbon was modified with a KOH solution of 0.5 mol/L, with a pH of 6 and a solid-liquid ratio of 1 g/L. The equilibrium adsorption time for lead ions in solution being adsorbed using KOH-modified hydrothermal carbon was 240 min, the adsorption process satisfied the quasi-second-order kinetic model and the Redlich-Peterson isotherm equation, and the equilibrium removal efficiency was 88.62%. The adsorption of lead ions using KOH-modified hydrothermal carbon is mainly chemical-physical adsorption.

High efficient Hg (II) and TNP removal by NH2 grafted magnetic graphene oxide synthesized from Typha latifolia

ABSTRACT The present study for the first time manifests the outstanding potential of amine grafted magnetic graphene oxide (m-GO-NH2) synthesized from Typha latifolia stems for mercury (Hg (II)) and 2,4,6-trinitrophenol (TNP) removal. The adsorption performance of m-GO-NH2 was apprized by considering the impact of the contact time (0–120 min), pH (2–9), adsorbent dose (5–40 mg), and adsorbate concentration (10–50 mg/L). The maximum Hg (II) and TNP removals (∼ 100%) were obtained using 30 mg adsorbent dose in 90 and 75 min, respectively. The best performance of m-GO-NH2 was observed at pH of 7, 20 mg/L Hg (II), and pH of 2, 30 mg/L TNP. According to the Brunauer–Emmett–Teller (BET) analysis, the surface area of GO was 34.81 m2/g and the simultaneous micro and mesoporosity was observed. Regarding the thermodynamic studies, the adsorption procedure was spontaneous and endothermic for Hg (II) followed Redlich-Peterson (R-P) and Freundlich isotherm equations while it was exothermic for TNP, well fitted with Langmuir and R-P isotherms. Kinetic data also indicated a good correlation with pseudo-second-order model. The highest adsorption capacity was estimated as 107.33 and 105.2 mg/g for Hg (II) and TNP, respectively. Accordingly, the proposed m-GO-NH2 can be a promising adsorbent for the elimination of metal and organic contaminants.

Modified expanded graphite/Fe3O4 composite as an adsorbent of methylene blue: Adsorption kinetics and isotherms

A magnetic expanded graphite (MEG) composite was synthesized by the explosive combustion method using black powder. Successful expanded graphite coating of iron oxide nanoparticles (Fe3O4) was confirmed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The expanded volume and specific surface area (SBET) of the expanded graphite were 300.0 mL/g and 34.8 m2/g, respectively, and the crystalline particle sizes of Fe3O4 were around 100–400 nm. In addition, the Fe3O4 and MEG exhibited magnetic properties, with a magnetic saturation of 72.1 and 17.5 emu/g, respectively. The adsorption kinetics of methylene blue (MB) dye were consistent with a pseudo-second-order model (R2 = 0.9999). The data obtained fit the Langmuir (R2 = 0.99906) and Redlich–Peterson (R2 = 0.99998) isotherm models, with a maximum MB adsorption capacity of 78.06 mg/g. The Redlich–Peterson isotherm equation best fit the adsorption experiment datasets examined in this study.

Biosorption of some pharmaceutical compounds from aqueous medium by Luffa cylindrica fibers: application of the linear form of the Redlich–Peterson isotherm equation

Biosorption of some pharmaceutical compounds from aqueous medium by Luffa cylindrica fibers: application of the linear form of the Redlich–Peterson isotherm equation

Adsorption Studies of Oil Spill Clean-up Using Coconut Coir Activated Carbon (CCAC)

The adsorption of crude oil from water by using Potassium hydroxide (KOH) prepared from coconut coir activated carbon CCAC_KOH was investigated by batch adsorption under varying parameters such as adsorbent dosage, contact time, initial oil concentration, temperature and agitation speed. The morphological modification significantly increased the hydrophobicity of the adsorbent, thus creating a CCAC with a much better adsorption capacity for crude oil removal having a maximum adsorption capacity of 4859.5 mg/g at 304 K as evidently proven by FTIR and SEM analysis. The experimental results showed that the percentage of crude oil removal increased with an increase in adsorbent dosage, contact time and decrease in initial oil concentration. The experimental isotherm data were analysed using Langmuir, Freundlich, Temkin, Toth, Sip and Redlich-Peterson isotherm equations and the best fitted isotherm model was Freundlich model with a high correlation coefficient (R² = 0.999). The kinetic data were properly fitted into various kinetic models with Pseudo-second order model showing best fit having a correlation coefficient (R² = 0.999) and Boyd model revealed that the adsorption was controlled by internal transport mechanism and film-diffusion was the major mode of adsorption. The crude oil adsorption was chemisorption and endothermic in nature (ΔH° = 134 KJ/mol.K) and the positive value of entropy (ΔS° = 0.517 KJ/mol.K) showed an increase in disorder and randomness at the adsorbent-adsorbate interface during the adsorption of crude oil from water. The decrease in Gibbs energy (ΔG°) with increasing temperature indicated an increase in the feasibility and spontaneity of the adsorption at higher temperatures. The prepared adsorbent showed significant capability to be used as a low-cost, re-generable and eco-friendly adsorbent in oil spill clean-up.

Modification of Fe2O3-contained lignocellulose nanocomposite with silane group to remove nitrate and bacterial contaminations from wastewater

Natural composite containing iron oxide in lignocellulose (L/IO) was obtained from an extract of apricot tree wood by heating it in a wood coal furnace. This method provided a facile, “green” pathway for the fabrication of magnetic carbon substrate without using chemical reactions. Ion exchange technology was used to remove the nitrate using (L/IO) modified with 3-chloropropyltrimethoxysilane and 1,4-diazabicyclo[2.2.2]octane (Dabco) (ML/IO). The physicochemical properties were characterized by field emission scanning electron micrographs (FESEM), energy-dispersive X-ray analysis (EDX), alternating gradient force magnetometer (AGFM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectra for both (L/IO) and (ML/IO) as adsorbents. Preliminary experiments indicated less favorability of (L/IO) in removing nitrate from water compared to (ML/IO). Batch adsorption experiments were performed and the effects of pH, contact time, adsorbent dosage, initial nitrate concentration (Ci), temperature and competing anions were assayed on nitrate adsorption by (ML/IO). The obtained data were modeled using four kinetic models including the pseudo-first order (PFO), pseudo-second order (PSO), Weber–Morris and Elovich. The best fit of experimental adsorption data was exhibited by means of the pseudo-second-order model (R2 0.99). Also, the equilibrium data were fitted to the Langmuir, Freundlich, Temkin, Redlich–Peterson isotherm equations and the favorable fit exhibited with two Langmuir and Redlich–Peterson isotherms (R2 0.98). Finally, the desorption and regeneration studies showed a promising reusability of the (ML/IO). Antimicrobial activities of both (L/IO) and (ML/IO) were investigated by disc diffusion method against two Gram-positive bacteria, namely S. aureus and B. cereus, and four Gram-negative bacteria, namely E. coli, K. pneumoniae, P. aeruginosa and S. typhi, and two fungi, namely Aspergillus niger and Saccharomyces cerevisiae, in vitro. The antimicrobial effects were more prominent in all cases for (ML/IO) compared to (L/IO). The investigations confirmed that (ML/IO) was more active against Gram-negative (IZD 8–19 mm) than Gram-positive (IZD 6–8 mm) bacteria. The highest antibacterial activity of (ML/IO) was exhibited against E. coli with IZD value of 19 mm.

Magnetic porous polymer composite for high performance adsorption of acid red 18 based on melamine resin and chitosan

Magnetic porous Fe3O4/MRCS polymer composite was prepared by reacting melamine-formaldehyde resin with chitosan in the present of amino modified Fe3O4 nanoparticles and used as adsorbent for acid red 18 azo dye removal. The Fe3O4/MRCS was characterized by TEM, SEM, XRD, TGA and BET analysis. The Fe3O4/MRCS possessed high BET surface area (226.6 m2/g), characteristic pore properties and facile magnetic separation function. The average pore width is 6.5 nm and the pore volume was 0.68 cm3/g. The Fe3O4/MRCS presented enhanced high adsorption performance toward acid red 18. It removed 99. 65% of acid red 18 (100 mg/L) when the adsorbent amount was over 0.8 g/L. It was found the absorption was depended on pH and the removal efficiency decreased with pH increased. The maximum adsorption capacity of acid red 18 reached as high as 301.0 mg/g. The adsorption kinetic followed the pseudo-second-order kinetics model and the activation energy of the adsorption process was 38.40 kJ/mol. The adsorption isotherms were best fitted to the Redlich–Peterson isotherm equation. Thermodynamic studies indicated the adsorption process was spontaneous and endothermic in nature. The adsorption mechanism study showed the adsorption was a heterogeneous chemisorption process with multiple interactions, involving pore filling, electrostatic attraction, affinity interaction, intra-particle diffusion, π-π interaction and polymer chain inclusion and polymer net trapping. In comparison with other reported adsorbents, the magnetic porous Fe3O4/MRCS showed superior adsorption performance for acid red 18 removal.

Facile synthesis of high performance porous magnetic chitosan - polyethylenimine polymer composite for Congo red removal

A new porous magnetic chitosan-polyethylenimine (Fe3O4/CS-PEI) polymer composite was synthesized by crosslinking chitosan (CS) with polyethylenimine (PEI) in the present of FeCl3·6H2O and FeCl2·4H2O in alkaline condition and applied to remove congo red (CoR) from aqueous solutions. The Fe3O4/CS-PEI composite was characterized by SEM, XRD, TGA and FT-IR analysis. The polymer composite owned high positive charge, large surface area, multi-level pore distribution and magnetic responsiveness. The porous magnetic Fe3O4/CS-PEI composite showed ultrahigh capacity (1876mg/g) for CoR removal. It removed over 99.3% of CoR (100mg/L) when the dosage was over 1.4g/L. A higher temperature was benefit to CoR removal. The Fe3O4/CS-PEI composite was effective for CoR removal in a wide pH range (3–13). Kinetics studies suggested that the adsorption mechanism of CoR followed the pseudo-second model and it was also affected by the boundary layer diffusion. The adsorption process followed the Redlich-Peterson isotherm equation. Thermodynamic studies also demonstrated that this adsorption process was spontaneous, favorable and endothermic. The activation energy (Ea) of the adsorption process was 34.08kJ/mol, indicating that chemisorption existed in the process. The results demonstrated that the porous magnetic Fe3O4/CS-PEI polymer composite is a promising adsorbent for the efficient removal of dye pollutants from aqueous solution.

Cross-linked amino konjac glucomannan as an eco-friendly adsorbent for adsorption of Cr(VI) from aqueous solution

A new eco-friendly adsorbent (ACKGM) derived from konjac glucomannan was prepared and used for Cr(VI) adsorption from aqueous solution. The ACKGM was synthesized by amino-modification of cross-linked konjac glucomannan through nucleophilic substitution approach. The adsorbent was characterized by scanning electron microscopy and Fourier Transform Infrared spectroscopy. The ACKGM possessed property of fast adsorption and over 92% of Cr(VI) was adsorbed in the first 10min. The adsorption equilibrium was reached in 45min. The ACKGM removed 99.98%–85.93% of Cr(VI) when initial Cr(VI) concentration varied in 20–150mg/L. It was found the absorption depended on pH and the optimum adsorption took place at pH=2. The maximum adsorption capacity was 34.1mg/g, when the dosage of ACKGM was 2.0g/L at 30°C. The adsorption kinetics followed the pseudo-second order kinetics equation and the activation energy (Ea) of the adsorption was 32.72kJ/mol. Different isotherm models were used to analyze the isotherms of the adsorption. The adsorption isotherms fitted best with the Redlich–Peterson isotherm equation. The enthalpy change (ΔH0) of adsorption was −23.21kJ/mol. The thermodynamic parameters showed the adsorption of Cr(VI) onto ACKGM was a spontaneous and exothermic process. The adsorption mechanism study showed that electrostatic attraction, affinity interaction and polymer inclusion and net trapping mechanisms were involved in the process. The present study suggests that the ACKGM is an effective adsorbent for the removal of Cr(VI) from aqueous solution.

CHEMICALLY MODIFIED KAPOK SAWDUST AS ADSORBENT OF METHYL VIOLET DYE FROM AQUEOUS SOLUTION

In this study, chemically modified Kapok sawdust was used as an adsorbent for the removal of methyl violet from aqueous solution. Batch studies were performed to address various experimental parameters including pH, contact time, and initial concentration for the removal of this dye. Effective pH for methyl violet removal was 5. A greater percentage of dye was removed with a decrease in the initial concentration of dye. Quasi-equilibrium reached in 30 min. Equilibrium isotherms were analyzed by Langmuir, Freundlich, and Redlich-Peterson isotherm equations using correlation coefficients and two different error functions. Freundlich equation is found to best represent the equilibrium data for methyl violet-modified Kapok sawdust system.

Removal of Rhodamine B and Congo Red from Aqueous Solutions by Adsorption onto Activated Carbons

The present study aims at the utilization of wood based activated carbons for the effective removal of rhodamine B and congo red dyes from water. Freundlich, langmuir and Redlich-Peterson isotherm equations were applied to the equilibrium adsorption studies and the isotherm parameters were evaluated. The adsorptions were almost over within 360 minutes and the pseudo-second order rate model fits the experimental data well. pH of the dye solutions affect the adsorptions significantly and maximum adsorptions were found at low pH values. Dilute acetic acid is found to desorb much of the adsorbed dye molecules.

A comparative examination of the adsorption mechanism of an anionic textile dye (RBY 3GL) onto the powdered activated carbon (PAC) using various the isotherm models and kinetics equations with linear and non-linear methods

The present study was designed to compare the linear and non-linear methods used to check the compliance of the experimental data corresponding to the isotherm models (Langmuir, Freundlich, and Redlich–Peterson) and kinetics equations (pseudo-first order and pseudo-second order). In this context, adsorption experiments were carried out to remove an anionic dye, Remazol Brillant Yellow 3GL (RBY), from its aqueous solutions using a commercial activated carbon as a sorbent. The effects of contact time, initial RBY concentration, and temperature onto adsorbed amount were investigated. The amount of dye adsorbed increased with increased adsorption time and the adsorption equilibrium was attained after 240min. The amount of dye adsorbed enhanced with increased temperature, suggesting that the adsorption process is endothermic. The experimental data was analyzed using the Langmuir, Freundlich, and Redlich–Peterson isotherm equations in order to predict adsorption isotherm. It was determined that the isotherm data were fitted to the Langmuir and Redlich–Peterson isotherms. The adsorption process was also found to follow a pseudo second-order kinetic model. According to the kinetic and isotherm data, it was found that the determination coefficients obtained from linear method were higher than those obtained from non-linear method.

Adsorptive Removal of Phenol from Aqueous Solution Using Activated Carbon Prepared from Babul Sawdust

AbstractStudy on the adsorption of phenol onto activated carbon prepared from Babul (Acacia nilotica) sawdust (BAC), a waste from sawmill, is presented in this paper. The effect of various parameters such as adsorbent dose (m), initial pH (pH0), contact time (t), initial concentration (Co), and temperature (T) on adsorption capacity of BAC was tested using batch adsorption experiments. The kinetic study was performed by using different kinetic models, viz pseudo first, pseudo second order, and intraparticle diffusion. Langmuir, Freundlich, Redlich-Peterson, and Temkin isotherm equations were used to find the suitable and well-describing experimental isotherm data. The adsorption of phenol onto BAC follows the pseudo second order kinetic model, and equilibrium adsorption data follow the Redlich-Peterson and Freundlich isotherm equation. The maximum removal of phenol was found to be about 83% for the initial concentration of 50 mg/L and about 50% for the higher initial concentration of 500 mg/L at 10 kg/...

Kinetics and equilibrium studies for the removal of cadmium ions by ion exchange resin

Cadmium is a highly toxic metal which is found in the effluent of battery manufacturing plants. In this study, the ability to remove cadmium ions using an ion exchange resin has been studied in single component sorption-exchange systems.The maximum sorption capacity of resin for cadmium ions has been reached at pH 5 and the value is 2.20mmole/g resin. This value shows that resin can effectively remove cadmium ions. The equilibrium isotherms have been analyzed using the Langmuir, Freundlich and Redlich–Peterson isotherm equations and the experimental data are best described by the Redlich–Peterson model.A series of kinetics studies have been conducted in an agitated batch reactor. Two variables have been studied under two different pH values, namely, 2.5 and 5.0, – different initial metal ion concentrations and different masses of resin. The kinetics of sorption of the cadmium ions have been analyzed by three kinetic models, the pseudo-first order, pseudo-second order and Elovich models. The rate constants and the correlation coefficients of the three kinetic models have been calculated. The experimental data were compared on the basis of SSE values and the pseudo-second model order provides the best fit to the experimental data.

Comparison of linear and nonlinear forms of isotherm models for Zn(II) and Cu(II) sorption on a kaolinite

The most appropriate method in designing the adsorption systems and assessing the performance of the adsorption systems is to have an idea on adsorption isotherms. Comparison analysis of linear least square method and nonlinear method for estimating the isotherm parameters was made using the experimental equilibrium data of Zn(II) and Cu(II) onto kaolinite. Equilibrium data were fitted to Freundlich, Langmuir, and Redlich–Peterson isotherm equations. In order to confirm the best-fit isotherms for the adsorption system, the data set using the chi-square (χ 2), combined with the values of the determined coefficient (r 2) was analyzed. Nonlinear method was found to be a more appropriate method for estimating the isotherm parameters. The best fitting isotherm was the Langmuir and Redlich–Peterson isotherm. The Redlich–Peterson is a special case of Langmuir when the Redlich–Peterson isotherm constant g was unity. The sorption capacity of kaolinite to uptake metal ions in the increasing order was given by Cu (4.2721 mg/g) < Zn (4.6710 mg/g).

Biosorption of Cd(II) by live and dead cells of Bacillus cereus RC-1 isolated from cadmium-contaminated soil

The present study investigated the biosorption capacity of live and dead cells of Bacillus cereus RC-1 for Cd(II). The biosorption characteristics were investigated as a function of initial pH, contact time, and initial cadmium concentration. Equilibrium biosorption was modeled using Langmuir, Freundlich and Redlich–Peterson isotherm equations. It was found that the maximum biosorption capacities calculated from Langmuir isotherm were 31.95mg/g and 24.01mg/g for dead cells and live cells, respectively. The kinetics of the biosorption was better described by pseudo-second order kinetic model. Desorption efficiency of biosorbents was investigated at various pH values. These results indicated that dead cells have higher Cd(II) biosorption capacity than live cells. Furthermore, zeta potential, transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX), and Fourier transform infrared spectroscopy (FTIR) studies were carried out to understand the differences in the Cd(II) biosorption behavior for the both biosorbents. The bioaccumulation of Cd(II) by B. cereus RC-1 was found to depend largely on extracellular biosorption rather than intracellular accumulation. Based on the above studies, dead biomass appears to be a more efficient biosorbent for the removal of Cd(II) from aqueous solution.

Adsorption of 4-chlorophenol by inexpensive sewage sludge-based adsorbents

Sewage sludge was used as precursor to develop a potential inexpensive adsorbent by both simple drying and pyrolysis. The resulting materials were evaluated as adsorbents for the removal of 4-chlorophenol (4-CP) from aqueous solution. The dried biosolids showed a BET surface area lower than 3m2/g, which yield a maximum adsorption capacity of 0.73mmol 4-CP/g at pH 5.0 and 15°C. The carbonization of biosolids under relatively mild conditions allowed obtaining materials with BET surface area up to 45m2/g, which led to a significant increase of the maximum adsorption capacity (1.36mmol 4-CP/g). The high ash content of the starting material (23%, d.b.) limits the development of porosity on a total dry-weight basis. Adsorption data were well fitted to the Redlich–Peterson isotherm equation whereas the most commonly used Langmuir and Freundlich equations were less satisfactory probably because of the occurrence of summative adsorption phenomenon. A thermodynamic study of the adsorption showed the spontaneous and exothermic nature of the process. Thus, simple drying and carbonization provide two ways of valorization of sewage sludge through its conversion into inexpensive low-rank adsorbents potentially useful for the removal of some hazardous water pollutants, like chlorophenols and related compounds.

Study on Pore Diameter Regulation of Thiol Functionalized Mesoporous Silica and Cu&lt;sup&gt;2+&lt;/sup&gt; Adsorption Performance

New thiol modified mesoporous adsorbent with different pore sizes was synthesized by hydrothermal, with triblock copolymers pluronic (F127) and cetyltrimethyl ammonium bromide (CTMABr) functioned as the mixing template, 1,3,5-trimethylbenzene (TMB) functioned as pore-expanding agent. Adsorption performance of different pore sized mesoporous adsorbents was studied by treatment of Heavy metal Cu2+. Results showed that the optimum dosage was molar ratio of 1.5 between TMB and surfactant, and under that condition, the BET pore size was 6.554 nm and BET pore volume was 0.6134cm3/g. The adsorption of Cu2+ on mesoporous adsorbents fitted well to Redlich-Peterson isotherm equation, which indicated chemisorption was dominant in the process of heavy metal adsorption on the mesoporous adsorption and monomolecular layer adsorption took advantage. According to Langmuir equation, QL was 0.6210 mmol/g, and that demonstrated pore-expanding treatment could not only enlarge pore volume and diameter, but also effectively increase the contact area with heavy metals. Pore-expanded functionalized mesoporous silica could act as the optimal adsorbents for heavy metal adsorption.

Biosorption of Ni (II) by Schizosaccharomyces pombe: kinetic and thermodynamic studies

The potential of the dried yeast, wild-type Schizosaccharomyces pombe, to remove Ni(II) ion was investigated in batch mode under varying experimental conditions including pH, temperature, initial metal ion concentration and biosorbent dose. Optimum pH for biosorption was determined as 5.0. The highest equilibrium uptake of Ni(II) on S. pombe, q (e), was obtained at 25 °C as 33.8 mg g(-1). It decreased with increasing temperature within a range of 25-50 °C denoting an exothermic behaviour. Increasing initial Ni(II) concentration up to 400 mg L(-1) also elevated equilibrium uptake. No more adsorption took place beyond 400 mg L(-1). Equilibrium data fitted better to Langmuir model rather than Freundlich model. Sips, Redlich-Peterson, and Kahn isotherm equations modelled the investigated system with a performance not better than Langmuir. Kinetic model evaluations showed that Ni(II) biosorption process followed the pseudo-second order rate model while rate constants decreased with increasing temperature. Gibbs free energy changes (ΔG°) of the system at 25, 30, 35 and 50 °C were found as -1.47E + 4, -1.49E + 4, -1.51E + 4, and -1.58E + 4 J mol(-1), respectively. Enthalpy change (ΔH°) was determined as -2.57E + 3 J mol(-1) which also supports the observed exothermic behaviour of the biosorption process. Entropy change (ΔS°) had a positive value (40.75 J mol(-1) K(-1)) indicating an increase in randomness during biosorption process. Consequently, S. pombe was found to be a potential low-cost agent for Ni(II) in slightly acidic aqueous medium. In parallel, it has been assumed to act as a separating agent for Ni(II) recovery from its aqueous solution.