Particle Diffusion Model Research Articles

Adsorption study of methyl orange by chitosan/polyvinyl alcohol/zeolite electrospun composite nanofibrous membrane

The chitosan/polyvinyl Alcohol/zeolite electrospun composite nanofibrous membrane was fabricated for adsorption of methyl orange. The EDX, TGA and tensile test were carried out for the characterization of the membrane. The Young’s Modulus of the nanofibrous membranes increased by more than 100% with the addition of zeolite to chitosan/PVA. The batch adsorption tests were conducted by varying the initial concentration of methyl orange, contact time and pH of the dye solution. UV–vis results showed that most of the dye was adsorbed within 6 min. An adsorption kinetic study was carried out using the pseudo-second-order kinetic model, Lagergren-first-order model and intra particle diffusion model. The adsorption kinetics obeyed the Pseudo second order model. The adsorption mechanism was analyzed using the Langmuir and Freundlich isotherm model. The experimental data fits well with the Freundlich model. The adsorption capacity of the membrane was 153 mg/g. Adsorption capacity was decreased with increasing pH value. The resulting nanofiber became less active over methyl orange after several runs.

Hydrothermal assisted magnetic nano-hydroxyapatite encapsulated alginate beads for efficient Cr(VI) uptake from water

The biopolymer, alginate can be made into various usable forms like beads, membrane and candle for the development of water technology. In the present study, an attempt has been made to prepare the alginate in an usable bead form. Here, magnetic nano-hydroxyapatite encapsulated alginate beads (Fe3O4@n-HApAlg) were synthesized by hydrothermal method for selective chromium removal. The synthesized Fe3O4@n-HApAlg beads have enhanced chromium sorptive capacity (SC) of 29.14 mg/g than the individual components. The synthesized materials were characterized by various instrumental techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) isotherm studies. The Cr(VI) sorptive mechanism of Fe3O4@n-HApAlg beads were interpreted by electrostatic attraction. Sorption behavior of the magnetic beads was explained using Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherms. The thermodynamic studies indicate the spontaneous and endothermic nature of Cr(VI) sorption. In the kinetic data demonstration, pseudo-first-order, pseudo-second-order, intra particle diffusion and particle diffusion models were employed. The reusability of Fe3O4@n-HApAlg beads was carried out using NaOH eluent and they can be used upto five cycles. The magnetic alginate hybrid beads showed the promising results against the chromium contaminated groundwater by removing Cr(VI) ions below the tolerance limit.

Fe-Oxide Nanomaterial: Synthesis, Characterization and Lead Removal

Organic solvent free iron oxide nanomaterial used for lead removal was synthesized by co-precipitation method. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopic with energy dispersive X-ray analysis (SEM-EDX), X-ray diffraction (XRD) and thermo gravimetric-differential thermal (TG-DTA) analysis were used to determine the surface characteristics and analysis of iron oxide. Optimization of solution pH, adsorbent dosage, contact time, agitation speed and initial lead ion concentration were conducted for further adsorption isotherm, kinetics, thermodynamics and desorption study. Langmuir sorption isotherm model fits the adsorption data better than Freundlich, Dubinin-Radushkevich (D-RK) and Flory-Huggins (FH) models. The mean adsorption energy and free energy obtained from D-RK and FH models guides that the mechanism was under control of physical adsorption and actuality of spontaneous reaction, respectively. From kinetics of adsorption pseudo second (PSO) model fits well than pseudo first (PFO) and Elovich adsorption-reaction models. And to test whether the reaction is under control of adsorption-diffusion or not the intra particle diffusion (IPD) model was tested, but it fails to pass through the origin. This indicates that the reaction mechanism only under control of adsorption-reaction. The maximum adsorption capacity (qmax) of the adsorbent was 70.422 mg/g.

The Efficient Removal of Heavy Metal Ions from Industry Effluents Using Waste Biomass as Low-Cost Adsorbent: Thermodynamic and Kinetic Models

Abstract The ability of green micro algae Chlorella vulgaris for biosorption of Cu(II) ions from an aqueous solution was studied. The biosorption process was affected by the solution pH, contact time, temperature and initial Cu(II) concentration. Experimental data were analyzed in terms of pseudo-first order, pseudo-second order and intra particle diffusion models. Results showed that the sorption process of Cu(II) ions followed pseudo-second order kinetics. The sorption data of Cu(II) ions are fitted to Langmuir, Freundlich, and Redlich–Peterson isotherms, and the Temkin isotherm. The thermodynamic study shows the Cu(II) biosorption was exothermic in nature. The Cu(II) ions were recovered effectively from Chlorella vulgaris biomass using 0.1 M H2SO4 with up to 90.3% recovery, allowing for recycling of the Cu. Green algae from freshwater bodies showed significant potential for Cu(II) removal and recovery from industrial wastewater.

Preparative separation and purification of flavonoids from Lamiophlomis rotata (Benth.) Kudo.

PurposeThe purpose of the paper is to separate and purify flavonoids existed in Lamiophlomis rotata (Benth.) Kudo. by macroporous adsorption resin (MAR) mixed-bed technology.Design/methodology/approachThe adsorption and desorption parameters were characterized by UV-VIS spectrophotometry. The optimal MAR mixed bed was screened based on the adsorption experiments; the experiment process was investigated by the order of single, two and three MAR mixed bed separately; and the adsorption performance, which was composed by the authority of 80 per cent adsorption ratios and 20 per cent desorption ratios, was adopted to screen MAR mixed bed for flavonoids. The adsorption dynamic investigated the order of reaction first, and then the adsorption mechanism was researched further. The adsorption thermodynamic investigated the adsorption isotherm first, and then the adsorption feature was analyzed.FindingsThis research found that MAR mixed bed of LS-840 + LSD301 with mass ratio of mLS840:mLSD301 = 3:2 was the optimized combination, and the optimal conditions of the adsorption were volume V = 50 mL, time t = 6.5 h, T = 40°C. The desorption conditions were ethanol content = 70 per cent, desorption time t = 3.0 h, T = 40°C. The adsorption dynamic experimental data fitted better to the pseudo-second-order, and the intra-particle-diffusion model was more suitable for expression of the adsorption mechanism in mesopores process, whereas the homogeneous particle-diffusion model was more suitable in microspores. The adsorption was a physical and multilayer adsorption, and the adsorption driving force was disappeared as it transferred to the fourth layer.Practical implicationsFind an efficient way to separate flavonoids that useful for human’s health, which can not only utilize of plant resources effectively, but also make outstanding contributions to medical industry. It has very high economic and social value.Originality/valueThis contribution provided a new way to separate flavonoids from Lamiophlomis rotata (Benth.) Kudo. Under the optimal conditions, the adsorption rate (F) of MAR mixed bed LS-840 + LSD301 to the flavonoids was 97.81 per cent, the desorption rate (D) was 90.02 per cent and the purity of flavonoids was dramatically increased about 2.08 fold of the crude extract from 28 to 58.4 per cent, and the recovery yield of flavonoids arrived at 91.6 per cent after a circle of adsorption/desorption operation.

Use of polymeric adsorbent Amberlite IR120 H resin for isonicotinic adsorption

The present work deals with the study of adsorption of isonicotinic acid (iNA) onto Amberlite IR120 H. Equilibrium and kinetic experiments are carried out to determine the effect of adsorbent dose (10g/L to 70g/L) initial concentration of iNA (0.01M to 0.05M), contact time (0 to 40min) and temperature (298 to 333K) on the capacity of the adsorbent. With an increase in the adsorbent dosage, the uptake capacity of adsorbent is found to decrease but with an enhancement in the recovery efficiency. The optimum dosage of adsorbent is found to be 50g/L. In the kinetic experiments, the percentage removal of iNA reaches to a constant value of 95% with Amberlite IR120 H (50g/L) after 30min. Increased temperature shows reverse trend in the removal efficiency of iNA. The change in enthalpy and entropy are estimated to be −8.80kJ/mol and −19.78J/mol/K, respectively. Equilibrium data are analyzed by using Langmuir, Freundlich and Temkin isotherm models. Kinetic models such as pseudo-first order, pseudo-second order and intra particle diffusion models are used to predict the kinetics of the adsorption process by Amberlite IR120 H for the removal of iNA.

Adsorption of direct yellow 12 from aqueous solutions by an iron oxide-gelatin nanoadsorbent; kinetic, isotherm and mechanism analysis

Fe3O4–gelatin was synthesized via a controlled co–precipitation method to obtain uniform and high efficient nanocomposite for direct yellow 12 (DY12) removal. The effect of dose of adsorbent, pH, contact time and initial dye concentration on the removal of DY12 was examined. The adsorbent morphology and chemical composition were evaluated using FE–SEM, VSM, FT–IR, XRD and BET. The analyses for characterization indicated that Fe3O4–gelatin was successfully obtained with crystallite size and average particle diameter about 82 nm and 81 nm, respectively. Langmuir, Freundlich, Temkin and Elovich isotherm models were checked by adsorption equilibrium data and Langmuir model indicated the best consistency with the experimental results and the maximum adsorption capacity was 1250 mg g−1. In addition, kinetic studies were investigated using pseudo–first–order, pseudo–second–order, Elovich and the intra–particle diffusion models. It was revealed that the adsorption behavior of DY12 on Fe3O4–gelatin was closer demonstrated by the pseudo–second–order kinetic model. The equation of Weber and Morris and Boyd plot were also studied to evaluate the adsorption mechanism. According to the results, Fe3O4–gelatin nanoadsorbent has high ability to remove DY12 from aqueous solution.

Methylene Blue Adsorption on a Low Cost Adsorbent-Carbonized Peanut Shell.

Carbonized peanut shell (CPS), a low cost adsorbent was investigated for adsorption of methylene blue from its aqueous solution. Some experimental parameters like the effect of initial dye concentration, initial solution pH, phases contact time and temperature were investigated. Langmuir, Freundlich and Harkins-Jura isotherm models were applied to the experimental data and Langmuir model fitted best. Monolayer adsorption capacity was 5.34 mg/g according to the Langmuir model. Adsorption capacity/uptake of CPS was found comparable to the some other adsorbent materials. The kinetic and intra particle diffusion models were applied to the experimental data. The experimental reaction was progressed via pseudo second order kinetic model. The thermodynamic parameters were also evaluated.

Modification of biochar derived from sawdust and its application in removal of tetracycline and copper from aqueous solution: Adsorption mechanism and modelling

Highly efficient simultaneous removal of Cu(II) and tetracycline (TET) from aqueous solution was accomplished by iron and zinc doped sawdust biochar (Fe/Zn-biochar). The mutual effects and inner mechanisms of their adsorption onto Fe/Zn-biochar were systematically investigated via sole and binary systems, sorption isotherm and adsorption kinetics models. The liquid-film diffusion step might be the rate-limiting step for tetracycline, the interaction of Cu(II) was more likely controlled by both intra particle diffusion model and liquid film diffusion model. The fitting of experimental data with kinetic models, Temkin model indicates that the adsorption process of tetracycline and Cu(II) involve chemisorption, and physico-chemical adsorption, respectively. There exists site competition and enhancement of Cu(II) and tetracycline on the sorption to Fe/Zn-biochar. The results of this study indicate that modification of biochar derived from sawdust shows great potential for simultaneous removal of Cu(II) and tetracycline from co-contaminated water.

Dactyloctenium aegyptium biomass (DAB)-MMT nano-composite: Synthesis and its application for the bio-sorption of Cu(II) ions from aqueous solution

Dactyloctenium aegyptium biomass (DAB), a novel plant based material was modified with Montmorillonite (MMT) clay to form DAB-MMT nano-composite as an adsorbent for the removal of Cu(II) ions from the aqueous solution. The surface morphology of the adsorbent was characterized by using scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX) and FTIR Fourier transform-infrared spectroscopy (FT-IR) analysis. The adsorption equilibrium was reached in 60 min and the optimum pH for adsorption was found to be 6. Equilibrium isotherm data were analysed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) isotherm models at 30, 40 and 50 °C and were best followed at 30 and 40 °C. Maximum adsorption capacity (qm) as calculated from Langmuir isotherm was found to be 18.51 mg g−1. Adsorption kinetics of Cu(II) onto DAM-MMT nano-composite was also studied using pseudo-first order, pseudo-second order and intra particle diffusion model over a wide range of concentration (10–100 mg L−1) and the adsorption of Cu(II) followed pseudo-second order kinetics showing that chemisorption process was involved. The thermodynamics parameters showed that the process was endothermic and spontaneous. The breakthrough and exhaustive capacities were found to be 10 mg g−1 and 25 mg g−1 respectively.

Behaviors and kinetics of toluene adsorption‐desorption on activated carbons with varying pore structure

This work was undertaken to investigate the behaviors and kinetics of toluene adsorption and desorption on activated carbons with varying pore structure. Five kinds of activated carbon from different raw materials were selected. Adsorption isotherms and breakthrough curves for toluene were measured. Langmuir and Freundlich equations were fitted to the equilibrium data, and the Freundlich equation was more suitable for simulating toluene adsorption. The process consisted of monolayer, multilayer and partial active site adsorption types. The effect of the pore structure of the activated carbons on toluene adsorption capacity was investigated. The quasi-first-order model was more suitable for describing the process than the quasi-second-order model. The adsorption data was also modeled by the internal particle diffusion model and it was found that the adsorption process could be divided into three stages. In the external surface adsorption process, the rate depended on the specific surface area. During the particle diffusion stage, pore structure and volume were the main factors affecting adsorption rate. In the final equilibrium stage, the rate was determined by the ratio of meso- and macro-pores to total pore volume. The rate over the whole adsorption process was dominated by the toluene concentration. The desorption behavior of toluene on activated carbons was investigated, and the process was divided into heat and mass transfer parts corresponding to emission and diffusion mechanisms, respectively. Physical adsorption played the main role during the adsorption process.

In situ preparation of “Cr-keeper” nanoparticles – Separation of trace vanadium (V) from chromium (VI) in aqueous solution

Abstract “Cr-keeper” nanoparticles (CKN) are in-situ synthesized based on the challenge of separation trace vanadium (V) from chromium (VI) in aqueous solution. Kelp is used as the bio-template and it can react with chromium (VI). Transmission electron microscopy (TEM) results reveal that CKN can copy the cell structure from kelp and the specific surface area of CKN is 343.20 m 2 /g. Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis confirm the formation of hydroxyl and Cr (III) species in CKN. The adsorption capacity of V (V) onto CKN is 51.20 mg/g and the maximum separation coefficient (β V/Cr = 3900) is achieved at pH 3.00. The adsorption kinetics follow pseudo-first-order model and Weber-Morris intra particle diffusion model. The adsorption isotherms follow the Sips model. The regeneration and reusability of CKN are discussed. All the results suggest that the utilization of biomass’s cell structure as the template for the fabrication of adsorbent with “Cr-keeper” function is excellent, which will bring new directions for Cr (VI) system purification.

Fabrication and investigation of MnFe2O4/MWCNTs nanocomposite by hydrothermal technique and adsorption of cationic and anionic dyes

In present study, MnFe2O4/MWCNT nanocomposite synthesized using the hydrothermal technique and has been used for removal of DR16 and Y40 dyes from aqueous solutions. The characteristics results of FTIR, XRD, FESEM and TEM indicated that the nanoadsorbent was successfully fabricated. Magnetic sensitivity results demonstrated that the nanoparticles with saturation magnetization (Ms) value of 8.93emug−1 would have a fast magnetic response. The performance of adsorption was investigated in a batch reactor employing parameters expected to affect the maximum adsorption capacity (qm) such as pH, contact time, initial dye concentration and temperature. The highest sorption capacities of DR16 and Y40 after 300min at 328K were found to be 607.79mg/g and 280mg/g at pH of 2 and 6, respectively. The adsorption behavior over the time was assessed through pseudo-first, pseudo-second and Weber–Morris intra particle diffusion models. It was found that the pseudo-second order model gave the best agreement to the experimental data. Adsorbate-adsorbent interactions as a function of temperature was evaluated by Langmuir, Freundlich, Temkin and Sips isotherm models from which Sips isotherm had the highest consistency with the experimental data. Thermodynamic parameters including ΔG°, ΔS° and ΔH° were determined over the temperature range of 298–328K. The results revealed that the adsorption reaction of DR16 onto MnFe2O4/MWCNT was spontaneous and exothermic, whilst the sorption process of Y40 was spontaneous and endothermic. In addition, activation energy values implied that the removal process of DR16 and Y40 was physical in nature.

Adsorptive removal of copper (II) and lead (II) using chitosan-g-maleic anhydride-g-methacrylic acid copolymer

In the present work, the maleic anhydride and methacrylic acid monomers were grafted one after another onto chitosan by using ceric ammonium nitrate as the initiator. The optimum conditions for grafting were studied by varying the initiator concentration, monomer concentration and reaction temperature. The synthesized grafted samples were subjected to various analytical techniques such as FTIR, XRD, TGA and DSC methods The proof of formation of graft copolymer was ascertained from the results of FTIR analysis and XRD studies. The TGA and DSC results conclude the highly thermally stable behavior of the prepared graft copolymer sample. The prepared graft copolymer was utilized for removing copper and lead from aqueous solutions and optimum adsorption parameters were evaluated under various pH, adsorbent dose, contact time and initial metal ion concentration. The adsorption and kinetic studies have been explained by Langmuir, Freundlich and pseudo − first order, second order and intra particle diffusion models. From the results, it was seen that Freundlich isotherm was best fit in the case of adsorption studies which followed pseudo second order kinetics. The obtained results showed that the chitosan-g-maleic anhydride-g-methacrylic acid copolymer was very efficient in removing the heavy metals copper and lead from aqueous solution.

Application of wastewater with high organic load for saline-sodic soil reclamation focusing on soil purification ability

Fresh water source scarcity in arid and semiarid area is limitation factor for saline-sodic soil reclamation. The reusing of agricultural drainage and industrial wastewater are preferred strategies for combating with this concern. The objective of current study was evaluation in application of industrial sugar manufacture wastewater due to high soluble organic compounds in saline-sodic and sodic soil. Also soil ability in wastewater organic compounds removal was second aim of present study. Saline-sodic and sodic soil sample was leached in soil column by diluted wastewater of amirkabir sugar manufacture in Khuzestan Province of Iran at constant water head. Sodium, electric conductivity and chemical oxygen demand of soil column leachate were measured per each pore volume. The experimental kinetics of wastewater organic compounds on two saline-sodic and sodic soil were also investigated by three pseudo second order, intra particle diffusion and elovich model. The results of current study showed that electric conductivity of saline-sodic soil was decreased to 90% during 3 initial pore volumes, from other side exchangeable sodium percent of saline-sodic and sodic soil decreased 30 and 71 percent, respectively. There were no significant different between wastewater chemical oxygen demand removal by saline-sodic and sodic soil in both batch and column studies. Wastewater chemical oxygen demand was decreased to 35% during pass through soil column. The results showed that the adsorption kinetics of wastewater organic compounds were best fitted by the pseudo-second order model with 99 percent correlation coefficient (r2=0.99%).

In English

Some technologies of uranium recovery from minerals involve hydrochloric acid where cationic forms of uranyl ions dominate. The work is devoted to development and testing of sorbents for removal of uranium(VI) from liquid wastes containing also an excess of Fe(III) ions. Organic-inorganic ion-exchangers based on gel-like strongly acidic resin containing zirconium hydrophosphate have been proposed for this purpose. The theoretical approach, which allows us to control a size of incorporated particles, has been applied to modification of the resin with the inorganic constituent. The results of TEM show that the samples contain mainly aggregates of nanoparticles (300 nm) or simultaneously aggregates (200 nm) and agglomerates (several microns). The synthesized organic-inorganic ion-exchangers contain from 10 to 50 mass. % of zirconium hydrophosphate. Composition and structure of the ion-exchangers affect their sorption properties. Sorption of U(VI) from modeling solutions containing also HCl and Fe(III) ions was researched under batch conditions. The initial pH of the solution was within the interval of 2–4, the sorbent dosage was 2–10 g/dm 3 . Simultaneous sorption of U(VI) and Fe(III) species was shown to occur, the removal of Fe(III) species is faster and more complete. Increasing of the sorbent dosage and the solution pH results in improvement of the efficiency of uranium (VI) removal and increase of the exchange rate. Sorption degree of uranyl cations reaches about 90 % after 3 h at pH 2 and the sorbent dosage of 10 g/dm 3 . When the sorbent dosage is 5 g/dm 3 and the solution pH is 4 the sorption degree reaches 100 % for the composite containing 10 % of the inorganic constituent. The sorption degree is lower for the materials containing higher amount of zirconium hydrophosphate. The rate of sorption has been found to obey mainly particle diffusion model. The models of chemical reaction of pseudo-first or pseudo-second order can be also applied. The composites show mainly higher sorption capacity towards U(VI) at pH 2, the pristine resin demonstrates higher capacity towards Fe(III) under these conditions. The organic-inorganic ion-exchangers can be recommended for polishing of liquid wastes which are formed during monazite processing.

Waste walnut shell valorization to iron loaded biochar and its application to arsenic removal

Iron loaded biochar (ILB) was prepared from waste walnut shell by microwave pyrolysis and its application for arsenic removal was attempted.The ILB was characterized using X-ray diffraction, scanning electron microscopy and BET Surface area analyzer. The adsorption isotherm of As(V) in ILB covering a temperature range of 25 to 45 °C, as well as the kinetics of adsorption at 25 °C were experimentally generated. Theadsorption isotherms were modeled using Langmuir and Freundlich isotherm models, while the kinetics of adsorption was modeled using thepseudo-first-order, pseudo-second-order kinetic models, and intra particle diffusion model. The ILB had a surface area of 418 m2/g with ironpresent in the form of hematite (Fe2O3) and magnetite (Fe3O4). The arsenic adsorption isotherm matches well with Langmuir isotherm model witha monolayer adsorption capacity of 1.91 mg/g at 25 °C. The adsorption capacity of As (V) well compares with other porous adsorbents widelyreported in literature, supporting its application as a cost effective adsorbent.

Kinetic Evaluations for the Sorption Process of Lanthanide Ions with Poly-O-toluidine Zr(IV) Tungstophosphate

The kinetic models for sorption of La3+, Ce3+ and Nd3+ ions on poly-o-toluidine Zr(IV) tungstophosphate (POTZr(IV)WP) were investigated under effecting of contact time, initial concentration and temperature. A comparison of kinetic models applied to the adsorption rate data of La3+, Ce3+ and Nd3+ ions on POTZr(IV)WP was evaluated for the pseudo-first order, the pseudo-second order, homogeneous particle diffusion and intra-particle diffusion kinetic models. The results showed that both the pseudo second-order and the homogeneous particle diffusion models were found to best correlate the experimental rate data. The particle diffusion coefficients (Di) and energy of activation (Ea) have been estimated. These investigations revealed that the equilibrium is attained faster at higher temperatures.

Preparation of L-arginine modified magnetic adsorbent by one-step method for removal of Zn(Ⅱ) and Cd(Ⅱ) from aqueous solution

A new type of magnetic adsorbent was prepared using a simple one-step synthesis for the removal of Zn(Ⅱ) and Cd(Ⅱ) from aqueous solution. Structure characterization demonstrated that the surface of the magnetic nanoparticles (MNPs) had been modified by L-arginine. Factors that affect the adsorption of Zn(Ⅱ) and Cd(Ⅱ) onto the MNPs modified with L-arginine (MNPs-L), such as pH, ionic strength, initial concentration, contact time, temperature, and compete adsorption, were investigated. The adsorption kinetic data followed the pseudo-second-order model (PSOE) and the intra particle diffusion model (IPD). Isotherm data demonstrate that the Langmuir absorption model was the best-suited model for this research, and the calculated maximum adsorption capacities of Zn(Ⅱ) and Cd(Ⅱ) were 150.4mg/g and 120.2mg/g, respectively. Thermodynamic parameters indicated a spontaneous and endothermic adsorption process. In addition, regeneration studies suggested that MNPs-L were stable. Thus, MNPs-L could be a promising material for removing Zn(Ⅱ) and Cd(Ⅱ) from wastewater.

Removal of methylene blue by using porous carbon adsorbent prepared from carbonized chestnut shell

Abstract Carbonized chestnut shell was investigated as a low cost adsorbent for the adsorption of methylene blue (MB) from aqueous solution. Some parameters like the effects of initial dye concentration, initial pH value of solution and contact time of phases were investigated. The equilibrium was attained in 120 minutes. The isotherm models of Langmuir, Freundlich and Dubinin Raduskhevich (DR) were applied to the experimental data and Langmuir and DR adsorption models fit better than the Freundlich model. The maximum MB mono adsorption capacity was found to be 5.13 mg × g−1 obtained by Langmuir model. This value of carbonized chestnut shell was comparable to the adsorption capacities of some other adsorbent materials for dyes. The pseudo first order, second order and intra particle diffusion models were chosen for analyzing adsorption rate data. The adsorption reaction progressed according to the pseudo second order kinetic and Weber Morris diffusion was also effective in the adsorption phenomena. The th...