Adsorption of cisplatin by the surface of the magnetic sensitive nanocomposite Fe3O4/Al2O3/С

One of the most widely used antitumor chemotherapeutic drugs is “Cisplatin” (active substance - cis-diaminodichloroplatinum), the side effects of which are the cumulative ototoxic, nephrotoxic and neurotoxic effects. The use of drug carrier systems for targeted delivery and adsorbents for extraction, in particular magnetite-carbon nanocomposites, will minimize unwanted toxic effects without reducing the therapeutic effect of cisplatin. For this purpose, a nanocomposite (NCs) of Fe3O4/Al2O3/С with a carbon surface was synthesized, where a layer of alumina protects magnetite during the pyrolysis of carbohydrates. The synthesized samples were characterized by TEM, XRD, mass spectrometry methods, magnetic properties and specific surface area were studied. It has been found that the used heat treatment mode (T = 500 °С, argon medium) is sufficient for complete carbonization of sucrose and preserves the phase of magnetite which does not lead to deterioration of magnetic characteristics. The results of TEM studies and magnetic measurements indicate the formation of the Fe3O4/Al2O3/С nanocomposite of the core-shell type. The adsorption of Cisplatin on the surface of NCs Fe3O4/Al2O3/С was performed and the adsorption process dependent on the contact time, pH of the solution and cisplatin concentration was studied. The experimental results of kinetic studies were analyzed for compliance with the theoretical models of Boyd and Morris-Weber, models of pseudo-first and pseudo-second orders. Langmuir and Freundlich isotherm models were used to model adsorption processes. The limiting factor of adsorption is the external diffusion mass transfer processes, which correlates with the calculated parameters of the pseudo-first-order model (r2 = 0.985). The correlation of theoretical and practically obtained values of adsorption capacity indicates the possibility of using the Freundlich model to describe the adsorption of Cisplatin on the surface of Fe3O4/Al2O3/C.

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Adsorption-Kinetic Studies of Mordant Exhaust Dyeing of Cotton and Silk Fabrics with Dye Extract of M. lucida Plant Species

South African Journal of Chemistry ◽

10.17159/0379-4350/2021/v75a16 ◽

2021 ◽

Vol 75 ◽

Author(s):

Janani Loum ◽

Robert Byamukama ◽

P.A.G. Wanyama

Keyword(s):

Adsorption Isotherms ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Freundlich Model ◽

Reaction Orders ◽

Dyed Fabrics ◽

Silk Fabrics ◽

Exhaust Dyeing ◽

Traditional Natural

ABSTRACT The kinetics and adsorption isotherms of the extremely slow traditional natural exhaust dyeing that takes many hours or days have been studied purposely to find means of improving the process. The dyeing of cotton and silk fabrics using dye extract of M. lucida at 50 °C were elucidated with graphs to predict the reaction orders and identify the appropriate adsorption isotherm model(s). Since the dye is UV active, changes in UV absorbance were used in place of changes in concentrations. The simultaneous and post mordanting methods followed pseudo-second-order reactions, hence chemisorption. However, mordant application to the dyed fabrics during post mordant followed a pseudo-first-order model, largely physisorption. Dyeing has followed Langmuir and Freundlich isotherm models with linear correlation r2 ranging between 1 and 0.998. From the Freundlich model and values of Langmuir constant RL (0.9307 to 1.0), the process is homogeneous, forming a favourable and linear monolayer. Accordingly, the dyeing speed can be improved by increasing the concentration of dye liquor. Additionally, according to the Freundlich model, higher dye intensity on fabrics is recorded in post mordanting. Keywords: adsorption isotherms, equilibrium, exhaust dyeing, mordant, rate law

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ADSORPTION AND KINETIC STUDIES OF A NATURAL DYE FROM CURCUMA LONGA L., ONTO BAMBOO YARN

Journal of Chemical Engineering and Industrial Biotechnology ◽

10.15282/jceib.v2i1.3802 ◽

2017 ◽

Vol 2 (1) ◽

pp. 13-26

Author(s):

Tengku Khamanur Azma Tg. Mohd Zamri ◽

Mimi Sakinah Abd Munaim ◽

Zularisam Ab Wahid

Keyword(s):

Adsorption Process ◽

Regression Coefficient ◽

Curcuma Longa ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Natural Dye ◽

Isotherm Models ◽

Order Model ◽

Dyeing Process ◽

Pseudo Second Order

Natural dye extracted from the rhizome of Curcuma longa L. were applied to bamboo yarns using exhaustion dyeing process. This study investigates the dyeing behaviour of Curcumin; the major color component isolated from rhizomes of Curcuma longa L.on bamboo yarn. Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to test the adsorption process of curcumin on bamboo yarn. Comparison of regression coefficient value indicated that the Freundlich isotherm most fitted to the adsorption of curcumin onto bamboo yarn. Furthermore, the kinetics study on this research fitted the pseudo-second order model which indicates that the basis of interaction was chemical adsorption.

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Enhanced biosorption of Cr(VI) using cotton fibers coated with chitosan – role of ester bonds

Water Science & Technology ◽

10.2166/wst.2018.284 ◽

2018 ◽

Vol 78 (3) ◽

pp. 476-486 ◽

Cited By ~ 1

Author(s):

Sergio I. Rojas ◽

Diana C. Duarte ◽

Sergio D. Mosquera ◽

Felipe Salcedo ◽

Juan P. Hinestroza ◽

...

Keyword(s):

Hexavalent Chromium ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Chitosan Solution ◽

Cotton Fibers ◽

Isotherm Models ◽

Order Kinetic ◽

Amino Groups ◽

Removal Capacity

Abstract We report on the role of ester bonds in the enhanced removal of hexavalent chromium from water using cotton fibers coated with chitosan. Adsorption capacities up to five times higher than those of the unmodified fibers were observed when the cotton fibers were exposed to an NaOH, followed by citric acid (0.97 M), and a chitosan solution (2%). We found that the use of NaOH favors the formation of ester bonds over amide bonds on the surface of the cotton fibers. This increase in the surface density of ester bonds generates an increase in the amount of exposed amino groups from the chitosan, hence increasing the removal capacity of the modified fibers. Experimental results also reveal that the adsorption is induced by the electrostatic attraction between the protonated amino groups on the surface and the negatively charged chromium ions in the water. Adsorption isotherms and kinetic studies indicated that the adsorption process fits the Langmuir and the Freundlich isotherm models as well as the pseudo-first and pseudo-second order kinetic models. These results can open a new avenue for the manufacturing of fibers with enhanced removal capacities for hexavalent chromium.

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Optimization, equilibrium and kinetic studies of Zn2+ and Ni2+ adsorption from aqueous solutions using composite adsorbent

Journal of Water Supply Research and Technology—AQUA ◽

10.2166/aqua.2018.150 ◽

2018 ◽

Vol 67 (3) ◽

pp. 279-290 ◽

Cited By ~ 4

Author(s):

Haider M. Zwain ◽

Mohammadtaghi Vakili ◽

Irvan Dahlan

Keyword(s):

Contact Time ◽

Coal Fly Ash ◽

Sol Gel ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Experimental Conditions ◽

Palm Oil Fuel Ash ◽

Composite Adsorbent ◽

Oil Fuel

Abstract A novel RHA/PFA/CFA composite adsorbent was synthesized from rice husk ash (RHA), palm oil fuel ash (PFA), and coal fly ash (CFA) by modified sol-gel method. Effect of different parameters such as adsorbent dosage, contact time, and pH were studied using batch experiment to optimize the maximum zinc (Zn2+) and nickel (Ni2) adsorption conditions. Results showed that the maximum adsorption condition occurred at adsorbent amount of 10 g/L, contact time of 60 min, and pH 7. At this condition, the removal efficiencies were 81% and 61% for Zn2+ and Ni2+, in which the adsorption capacities (qmax) were 21.74 mg/g and 17.85 mg/g, respectively. Adsorption behavior of RHA/PFA/CFA composite adsorbent was studied through the various isotherm models at different adsorbent amounts. The results indicated that the Freundlich isotherm model gave an excellent agreement with the experimental conditions. Based on the results obtained from the kinetic studies, pseudo-second-order was suitable for the adsorption of Ni2+ and Zn2+, compared to the pseudo-first-order model. The results presented in this study showed that RHA/PFA/CFA composite adsorbent successfully adsorbed Zn2+ and Ni2.

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Parametric, equilibrium and kinetic studies on the removal of mercury using ion exchange resin

Water Practice & Technology ◽

10.2166/wpt.2017.037 ◽

2017 ◽

Vol 12 (2) ◽

pp. 305-313 ◽

Cited By ~ 2

Author(s):

N. Rajamohan ◽

M. Rajasimman

Keyword(s):

Freundlich Isotherm ◽

Kinetic Studies ◽

Strong Acid ◽

Ion Exchange Resin ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Acid Cation ◽

Pseudo Second Order ◽

Langmuir Constants

This experimental research was an investigation into removal of mercury by using a strong acid cation resin, 001 × 7. Parametric experiments were conducted to determine the optimum pH, resin dosage, agitation speed and the effect of change in concentration in the range of 50–200 mg/L. High resin dosages favoured better removal efficiency but resulted in lower uptakes. Equilibrium experiments were performed and fitted to Langmuir and Freundlich isotherm models. Langmuir model suited well to this study confirming the homogeneity of the resin surface. The Langmuir constants were estimated as qmax = 110.619 mg/g and KL = 0.070 L/g at 308 K. Kinetic experiments were modeled using Pseudo second order model and higher values of R2 (>0.97) were obtained. The Pseudo second order kinetic constants, namely, equilibrium uptake (qe) and rate constant (k2), were evaluated as 59.17 mg/g and 40.2 × 10−4 g mg−1 min−1 at an initial mercury concentration of 100 mg/L and temperature of 308 K.

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Green synthesis of Quercus coccifera hydrochar in subcritical water medium and evaluation of its adsorption performance in BR18 dye

Water Science & Technology ◽

10.2166/wst.2020.607 ◽

2020 ◽

Author(s):

Mohammed Saleh ◽

Zeynep Bilici ◽

Yasin Ozay ◽

Erdal Yabalak ◽

Mutlu Yalvac ◽

...

Keyword(s):

Removal Efficiency ◽

Subcritical Water ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Suitable Model ◽

Water Medium ◽

Quercus Coccifera ◽

Intraparticle Diffusion Model ◽

The Relationship

Abstract In this study, we investigated the production conditions of hydrochar produced from Quercus coccifera, which is an inexpensive and easy available adsorbent, for the adsorption of Basic Red 18 (BR18) azo dye. Hydrochar was produced in the eco-friendly subcritical water medium (SWM). The effects of the pH (2–10), adsorbent size (45–106 μm), adsorbent dose (0.5–1.5 g/L), dyes concentrations (40–455 mg/L), and contact time (5–120 min) were studied through the optimization experiments. The optimum condition was obtained at pH 10, particle size of 45 μm, particle amount of 1.5 g/L, dyes concentration of 455 mg/L, and 60 minutes. The removal efficiency increased sharply for the first 5 min after that the removal efficiency reached a steady state at the 60 min with maximum removal of 88.7%. The kinetic studies for the adsorption of BR18 dye in aqueous solution using hydrochar showed the second-order kinetics. Langmuir and Freundlich isotherm models were used to explain the relationship between adsorbent and adsorbate and Freundlich isotherm was the most suitable model because of its high regression coefficient (R2) value. The intraparticle diffusion model was used to determine the adsorption mechanism of the BR18 onto Q. coccifera fruit. Desorption studies were also carried out using different type acids and different molarity.

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Parametric and adsorption kinetic studies of methylene blue removal from simulated textile water using durian (Durio zibethinus murray) skin

Water Science & Technology ◽

10.2166/wst.2015.247 ◽

2015 ◽

Vol 72 (6) ◽

pp. 896-907 ◽

Cited By ~ 18

Author(s):

S. M. Anisuzzaman ◽

Collin G. Joseph ◽

D. Krishnaiah ◽

A. Bono ◽

L. C. Ooi

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Dye Adsorption ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Durio Zibethinus

In this study, durian (Durio zibethinus Murray) skin was examined for its ability to remove methylene blue (MB) dye from simulated textile wastewater. Adsorption equilibrium and kinetics of MB removal from aqueous solutions at different parametric conditions such as different initial concentrations (2–10 mg/L), biosorbent dosages (0.3–0.7 g) and pH solution (4–9) onto durian skin were studied using batch adsorption. The amount of MB adsorbed increased from 3.45 to 17.31 mg/g with the increase in initial concentration of MB dye; whereas biosorbent dosage increased from 1.08 to 2.47 mg/g. Maximum dye adsorption capacity of the durian skin was found to increase from 3.78 to 6.40 mg/g, with increasing solution pH. Equilibrium isotherm data were analyzed according to Langmuir and Freundlich isotherm models. The sorption equilibrium was best described by the Freundlich isotherm model with maximum adsorption capacity of 7.23 mg/g and this was due to the heterogeneous nature of the durian skin surface. Kinetic studies indicated that the sorption of MB dye tended to follow the pseudo second-order kinetic model with promising correlation of 0.9836 < R2 < 0.9918.

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The Elimination by Natural Algerian Clay of Chromium Ions from Salt Water

Annales de Chimie Science des Matériaux ◽

10.18280/acsm.450202 ◽

2021 ◽

Vol 45 (2) ◽

pp. 105-112

Author(s):

Rachid Chebbi ◽

Amar Fadel ◽

Amel Aidi

Keyword(s):

Metal Ion ◽

Salt Water ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Ion Concentration ◽

Isotherm Models ◽

Adsorption Method ◽

Retention Capacity ◽

Chromium Ions ◽

Stirring Time

This paper studies the removal of chromium ions from synthetic brackish water by an adsorption method using natural Algerian Bentonite (NAB), the mineral clay was characterized through FTIR, XRD and SEM/EDS analysis. The effect of the main physicochemical parameters; namely: clay dosage, initial metal ion concentration, pH, and contact time on the removal of Cr+3 was investigated. The results showed that equilibrium was attained within 5 minutes of stirring time. The retention capacity of Cr+3 increased with the increase of adsorbent dose and decreased with the increased initial metal ion concentration. The Langmuir and Freundlich isotherm models were applied to determine the efficiency of bentonite used as an adsorbent. According to the obtained results, the Langmuir model adjusts very well to the experimental data. Based on the kinetic studies for the raw bentonite, it was verified that the mechanism corresponds to predominant pseudo-second- order adsorption.

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The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies

Journal of Water and Health ◽

10.2166/wh.2020.057 ◽

2020 ◽

Author(s):

Fateme Poorsharbaf Ghavi ◽

Fereshteh Raouf ◽

Ahmad Dadvand Koohi

Keyword(s):

Ph Effect ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Order Kinetic ◽

Thermodynamic Studies ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Modified Clinoptilolite ◽

Kinetic And Thermodynamic Studies

Abstract The elimination of diclofenac traces from aqueous environments is important. In this research, the effect of alkaline (NaOH) pretreatment on clinoptilolite before its modification with a surfactant (HDTMA) for diclofenac adsorption under the speculation of the sole presence of diclofenac in the aqueous solution is investigated. The results are compared through isotherm, kinetic, and thermodynamic studies and supplemented by FTIR, SEM, BET, and the zeta potential analyses. The contact time was investigated in a 0–180-min range. The pH effect was studied in a range of 5–10 because of diclofenac dissociation below pH = 5. The effect of the temperature on diclofenac adsorption was also considered by establishing the experiments at 25, 35, and 45 °C. For HDTMA-modified clinoptilolite, Temkin, and for NaOH-HDTMA-modified clinoptilolite, Dubinin–Radushkevich, and Freundlich isotherm models and in both cases, the pseudo-second-order kinetic model fitted the experimental data best. All the enthalpy and the entropy changes were negative, suggesting exothermic adsorption with a decrease in the degree of freedom of diclofenac anions after the adsorption. Furthermore, diclofenac physisorption was confirmed through isotherm and kinetic studies.

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Removal of Carcinogenic Dyes Congo red (CR) and Bismarck brown Y (BBY) by Adsorption onto Reusable Hydrogels Derived from Acrylamide

Journal of Physics Conference Series ◽

10.1088/1742-6596/2063/1/012011 ◽

2021 ◽

Vol 2063 (1) ◽

pp. 012011

Author(s):

Huda S Al-Niaeem ◽

Ali A Abdulwahid ◽

Whidad S Hanoosh

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Congo Red ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Sulphonic Acid ◽

Isotherm Models ◽

Anionic Dyes ◽

Best Fitting ◽

Pseudo Second Order

Abstract Hydrogels of acrylamide (AM), acrylamide\ 2-acrylamido-2-methyl-1-propane sulphonic acid (AMS), and acrylamide\ 2-acrylamido-2-methyl-1-propane sulphonic acid\graphene oxide (AMSGO) were prepared as adsorbents to remove carcinogenic dyes Congo red (CR) and Bismarck brown Y (BBY) from aqueous solutions. Hydrogels were characterized using FSEM and XRD analyses. For both dyes, the synthesized hydrogels demonstrated high adsorption capability at near-neutral pH. Experimental adsorption data were analyzed using the Langmuir and Freundlich isotherm models. It was found that the Langmuir model was more suitable for the experimental data. Kinetic studies found that the pseudo-second-order model demonstrated the best fitting to the experimental data. In addition, thermodynamic studies suggest that the adsorption process was spontaneous and endothermic. The prepared hydrogels were regenerated and reused in four consecutive cycles and it could be applied to remove anionic dyes from aqueous solutions as an effective adsorbent.

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