REMOVAL OF FERRIC IONS (Fe+3) FROM NEUTRAL SOLUTIONS USING MODIFIED CHITOSAN

The object of this study is to assess the removal of Fe(III) ions from aqueous solutions onto modified chitosan. The effect of various parameters has been investigated by the following batch adsorption technique. The various variables studied include initial concentration of the adsorbate, agitation time, adsorbent dosage, kinetics, influence of temperature. The experimental data was fit well to the Freundlich isotherm. Thermodynamic parameters such as ΔH, ΔS and ΔG were calculated, indicating that the adsorption was spontaneous and endothermic nature.

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REMOVAL OF FERRIC IONS (Fe+3) FROM NEUTRAL SOLUTIONS USING MODIFIED CHITOSAN

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v12i2.2156 ◽

2016 ◽

Vol 12 (2) ◽

pp. 3996-4008

Author(s):

Hussein A Mohamed ◽

Magdy A Wassel ◽

Rabie S Farg ◽

Hassan A Shehata ◽

Aamal M Anwar

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Thermodynamic Parameters ◽

Freundlich Isotherm ◽

Batch Adsorption ◽

Ferric Ions ◽

Influence Of Temperature ◽

Initial Concentration ◽

Modified Chitosan ◽

Agitation Time

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The Removal of Uranium and Thorium from Aqueous Solutions Onto by-pass Cement Dust (BCD)

Eurasian Chemico-Technological Journal ◽

10.18321/ectj303 ◽

2016 ◽

Vol 11 (2) ◽

pp. 105

Author(s):

Ali Omnia M. ◽

El-Kashif H.H. ◽

Sayed S.A. ◽

Shalabi M.E.H.

Keyword(s):

Aqueous Solutions ◽

Thermodynamic Parameters ◽

Freundlich Isotherm ◽

Adsorption Behavior ◽

Energy Of Activation ◽

Optimum Conditions ◽

Cement Dust ◽

Initial Concentration ◽

First Order ◽

Batch Technique

The adsorption behavior of uranium and thorium from aqueous solutions by By-pass cement dust (BCD) has been investigated by a batch technique. The uranium and thorium adsorption on BCD was studied as a function of initial concentration, weight of BCD, pH, shaking time and temperature. The uptake of uranium and thorium at the determined optimum conditions follows Freundlich isotherm. The adsorption control of both thorium and uranium are first order and uptake energy of activation Ea =10 and 15 kJ/mol for thorium and uranium respectively. Thermodynamic parameters such as ΔHo, ΔSo and ΔGo were also investigated.

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Multi-Component Adsorption of Benzene, Toluene, Ethylbenzene, and Xylene from Aqueous Solutions by Montmorillonite Modified with Tetradecyl Trimethyl Ammonium Bromide

Journal of Chemistry ◽

10.1155/2013/589354 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 15

Author(s):

H. Nourmoradi ◽

Mehdi Khiadani ◽

M. Nikaeen

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Structural Changes ◽

Freundlich Isotherm ◽

Isotherm Models ◽

Ammonium Bromide ◽

Order Kinetic ◽

Multicomponent Adsorption ◽

Benzene Toluene ◽

Kinetic And Isotherm Models

Multicomponent adsorption of benzene, toluene, ethylbenzene, and xylene (BTEX) was assessed in aqueous solutions by montmorillonite modified with tetradecyl trimethyl ammonium bromide (TTAB-Mt). Batch experiments were conducted to determine the influences of parameters including loading rates of surfactant, contact time, pH, adsorbate concentration, and temperature on the adsorption efficiency. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to determine the adsorbent properties. Results showed that the modification of the adsorbent via the surfactant causes structural changes of the adsorbent. It was found that the optimum adsorption condition achieves with the surfactant loading rate of 200% of the cation exchange capacity (CEC) of the adsorbent for a period of 24 h. The sorption of BTEX by TTAB-Mt was in the order ofB<T<E<X. The experimental data were fitted by many kinetic and isotherm models. The results also showed that the pseudo-second-order kinetic model and Freundlich isotherm model could, respectively, be fitted to the experimental data better than other available kinetic and isotherm models. The thermodynamic study indicated that the sorption of BTEX with TTAB-Mt was achieved spontaneously and the adsorption process was endothermic as well as physical in nature. The regeneration results of the adsorbent also showed that the adsorption capacity of adsorbent after one use was 51% to 70% of original TTAB-Mt.

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Equilibrium, Kinetic, and Thermodynamic Studies of Anionic Dyes Adsorption on Corn Stalks Modified by Cetylpyridinium Bromide

Colloids and Interfaces ◽

10.3390/colloids3010004 ◽

2018 ◽

Vol 3 (1) ◽

pp. 4 ◽

Cited By ~ 5

Author(s):

Liudmyla Soldatkina ◽

Marianna Zavrichko

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Cationic Surfactant ◽

Kinetic Studies ◽

Batch Adsorption ◽

Cetylpyridinium Bromide ◽

Anionic Dyes ◽

Pseudo Second Order ◽

Dyes Adsorption

Corn stalks (CS) were modified by a cationic surfactant, cetylpyridinium bromide (CPB), and used as an adsorbent (CS-CP) to remove anionic dyes [Acid Red (AR) and Acid Orange (AO)] from aqueous solutions. The FTIR analysis and the obtained calculations based on the determination of the adsorption capacity of CS towards CPB confirmed that the cationic surfactant had been adsorbed on the surface of corn stalks. Adsorption of the anionic dyes on modified corn stalks was investigated in a series of batch adsorption experiments at 303–328 K. The adsorption data were analyzed using Langmuir, Freundlich, and Temkin models. The Langmuir model was found to be more suitable for the experimental data of the anionic dyes on CS-CP than other adsorption models. Kinetic studies revealed that the pseudo-second order model showed the best fit to the experimental data. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic. Mechanisms involving ion exchange and chemisorption might be responsible for the uptake of the anionic dyes on CS-CP. Obtained results imply that CS-CP could be applied as an effective adsorbent to remove anionic dyes from aqueous solutions.

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Arsenic removal using Prosopis spicigera L. wood (PsLw) carbon–iron oxide composite

Applied Water Science ◽

10.1007/s13201-020-01298-w ◽

2020 ◽

Vol 10 (9) ◽

Author(s):

Ramasubbu DhanaRamalakshmi ◽

Mahalingam Murugan ◽

Vincent Jeyabal

Keyword(s):

Iron Oxide ◽

Large Scale ◽

Adsorption Process ◽

Arsenic Removal ◽

Freundlich Isotherm ◽

Second Order ◽

Batch Adsorption ◽

Experimental Conditions ◽

Initial Concentration ◽

Oxide Composite

Abstract The present manuscript reports the removal of arsenic from aqueous solution using iron oxide composite of carbon derived from the plant material Prosopis spicigera L. wood which depletes the ground water of ponds, lakes and other water bodies. The adsorbent was characterised by Fourier Transform Infra Red spectroscopy and Scanning Electron Microscope for surface analysis; Brunauer–Emmett–Teller and methylene blue method for surface area determination and pHzpc for surface charge determination. Experimental conditions such as pH, contact time, adsorbate initial concentration and in the presence other ions are varied to study the batch adsorption equilibrium experiment. The adsorption process was tested with Langmuir and Freundlich isotherm model and Langmuir isotherm was best suited. Sorption kinetics was analysed with pseudo-first- and second-order kinetics but adsorption follows second order kinetics. For an initial concentration of 60 mg/L of As(III) ions, adsorption capacity was found to be 83.84 mg/g at pH = 6.0. Thermodynamically the adsorption process is spontaneous, feasible and endothermic in nature. Adsorption involves pore diffusion, external mass transfer and complex formation. Column study was performed to apply this process for large scale treatment.

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REMOVAL OF LEAD (Pb ) AND ZINC (Zn ) FROM AQUEOUS SOLUTIONS BY ADSORPTION ON VERMICULITE FROM ASKOS AREA IN MACEDONIA (NORTHERN GREECE).

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.16617 ◽

2018 ◽

Vol 36 (1) ◽

pp. 182

Author(s):

A. Bourliva ◽

K. Michailidis ◽

C. Sikalidis ◽

G. Trontsios

Keyword(s):

Heavy Metal ◽

Aqueous Solutions ◽

Low Cost ◽

High Capacity ◽

Freundlich Isotherm ◽

Batch Adsorption ◽

Northern Greece ◽

Batch Type ◽

Zinc Removal ◽

Lead And Zinc

The lead and zinc removal from their aqueous solutions by vermiculite samples from Askos area, Northern Greece, was studied using a batch type method. Askos vermiculite is mainly consisted of mixed-layer phyllosilicates. A standard vermiculite sample from Kent, Connecticut was also used for comparison reasons. The concentration of the solutions used varied between 100 and 2000mg/L The maximum uptake capacity of the Askos vermiculite for lead and zinc was found to reach 95% and 96% from solutions containing 100mg/L, respectively. Much lower uptake capacities: 37% for lead and 76% for zinc were found for the Kent vermiculite. The experimental results showed that the Askos vermiculite exhibited an acceptable high capacity for removing metal ions from aqueous solutions. Thus, this untreated and low-cost mineral can find use in purifying heavy metal wastewaters. The uptake distribution coefficient (Kd) showed that the relative lead and zinc removal is higher for initial concentrations below 1000mg/L Batch adsorption experiments conducted at room temperature (22±1°C) showed that the adsorption patterns followed the Freundlich isotherm model. The heavy metal (Pb2+, Zn2+) removal is a rather complicated phenomenon related both to the aqueous chemistry of the elements and the interaction of their cationic species with the used materials. The removal procedure can be attributed to different processes such as ion exchange, adsorption, and precipitation.

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Surface Interactions and Mechanisms Study on the Removal of Iodide from Water by Use of Natural Zeolite-Based Silver Nanocomposites

Nanomaterials ◽

10.3390/nano10061156 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1156 ◽

Cited By ~ 2

Author(s):

Vassilis J. Inglezakis ◽

Aliya Satayeva ◽

Almira Yagofarova ◽

Zhandos Tauanov ◽

Kulyash Meiramkulova ◽

...

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Natural Zeolite ◽

Silver Content ◽

Surface Interactions ◽

Initial Concentration ◽

Silver Nanocomposites ◽

Modified Zeolites ◽

Excess Iodide

In this work a natural zeolite was modified with silver following two different methods to derive Ag2O and Ag0 nanocomposites. The materials were fully characterized and the results showed that both materials were decorated with nanoparticles of size of 5–25 nm. The natural and modified zeolites were used for the removal of iodide from aqueous solutions of initial concentration of 30–1400 ppm. Natural zeolite showed no affinity for iodide while silver forms were very efficient reaching a capacity of up to 132 mg/g. Post-adsorption characterizations showed that AgI was formed on the surface of the modified zeolites and the amount of iodide removed was higher than expected based on the silver content. A combination of experimental data and characterizations indicate that the excess iodide is most probably related to negatively charged AgI colloids and Ag-I complexes forming in the solution as well as on the surface of the modified zeolites.

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Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Adsorption Science & Technology ◽

10.1155/2021/6655227 ◽

2021 ◽

Vol 2021 ◽

pp. 1-15

Author(s):

Patience Mapule Thabede ◽

Ntaote David Shooto ◽

Thokozani Xaba ◽

Eliazer Bobby Naidoo

Keyword(s):

Nigella Sativa ◽

Freundlich Isotherm ◽

Synthetic Wastewater ◽

Batch Adsorption ◽

Initial Concentration ◽

X Ray ◽

Operational Conditions ◽

First Order ◽

Chromium Vi ◽

Ketonic Group

The aim of the present study was to utilise pristine and magnetite-sucrose functionalized Nigella Sativa seeds as the adsorbents for the uptake of chromium(VI) and lead(II) ions from synthetic wastewater. Prestine Nigella Sativa seeds were labelled (PNS) and magnetite-sucrose functionalized Nigella Sativa seeds (FNS). The PNS and FNS composites were characterized by Fourier-transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The FTIR analysis of both adsorbents revealed the presence of vibrations assigned to 1749 and 1739 cm-1 (-C=O) for ketonic group for both adsorbents. The amide (-NH) peak was observed at 1533 and 1527 cm-1 on FNS and PNS composites, respectively, whilst the carboxyl group (-COOH) were observed at 1408 cm-1 on both adsorbents. The XRD results of FNS and PNS composites showed a combination of spinel structure and y -Fe2O3 phase confirming the formation of iron oxide. The influence of operational conditions such as initial concentration, temperature, pH, and contact time was determined in batch adsorption system. The kinetic data of Cr(VI) and Pb(II) ions on both adsorbents was described by pseudo-first-order (PFO) model which suggested physisorption process. The sorption rate of Cr(VI) ions was quicker, it attained equilibrium in 20 min, and the rate of Pb(II) ions was slow in 90 min. Freundlich isotherm described the mechanism of Pb(II) ions adsorption on PNS and FNS composites. Langmuir best fitted the uptake of Cr(VI) ions on PNS and FNS. The results for both adsorbents showed that the removal uptake of Pb(II) ions increased when the initial concentration was increased; however, Cr(VI) uptake decreased when the initial concentration increased. The adsorption of Cr(VI) and Pb(II) ions on both adsorbents increased with temperature.

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Removal of Lead Ions from Aqueous Solutions by a Novel Ficus carica L.-Zeolite-Alginate Biocomposite

10.20944/preprints201809.0530.v1 ◽

2018 ◽

Author(s):

Meruyert Kaygusuz ◽

Cem Gök

Keyword(s):

Aqueous Solutions ◽

Thermodynamic Parameters ◽

Contact Time ◽

Lead Concentration ◽

Ficus Carica ◽

Lead Ions ◽

Initial Concentration ◽

Biosorption Process

In this study, fig leaves, zeolite and alginate were used to prepare a biocomposite for the adsorption of Pb(II) ions from aqueous solutions. Effects of various parameters on the biosorption process such as pH, temperature, initial lead concentration and contact time have been investigated. Maximum uptake of Pb(II) ions (85%) has been achieved at pH 6, with 25 mg/L of initial concentration and at a temperature of 288.15 K. Among the applied models, the data correlated well with Freundlich and D-R models and it was established that the biosorption was physical in nature. The amount of adsorbed lead per gram of sorbent was found to be 150.3 mg/g. Thermodynamic parameters showed the exothermic heat of biosorption and the feasibility of the process. Results have suggested that the prepared biosorbent possesses promising biosorption potential.

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Removal of Dye Acid Red 1 from Aqueous Solutions Using Chitosan-iso-Vanillin Sorbent Material

Indonesian Journal of Science and Technology ◽

10.17509/ijost.v5i3.24986 ◽

2020 ◽

Vol 5 (3) ◽

pp. 352-365

Author(s):

Eman Al Abbad ◽

Fadi Alakhras

Keyword(s):

Aqueous Solutions ◽

Low Cost ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Sorption Process ◽

Modified Chitosan ◽

Sorbent Material ◽

Removal Capacity ◽

Rate Determining Step ◽

Acid Red 1

Sorption of Acid Red 1 (AR1) from aqueous solutions utilizing low-cost sorbent material; (chitosan-iso-vanillin) is studied under batch conditions. The remaining concentrations of the azo dye are measured at λmax = 546 nm by UV spectrophotometric method. Langmuir data reveal that the maximum removal capacity was 555.556 mg/g at pH 3. Freundlich isotherm represents the best fitting model on the removal of AR1 using chemically modified chitosan verifying the sorption takes place on heterogeneous surfaces with multilayer adsorption. Kinetic studies of the sorption process revealed that intraparticle diffusion is not only the rate-determining step but also a chemical reaction takes place as well. The results indicate that high sorption rapidness with almost 90% achieved within 90 min. Thermodynamic investigations suggest that the process favours an exothermic nature. The polymer utilized in the present study is being considered as a feasible sorbent material for the removal of AR1 from waste effluent.

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