Vanadium removal from aqueous solutions by adsorption onto chitosan films

Cadaval, Tito R.S.; Dotto, Guilherme L.; Seus, Elisa Rosa; Mirlean, Nicolai; Pinto, Luiz Antônio de Almeida

doi:10.1080/19443994.2015.1079741

Cited by 35 publications

(9 citation statements)

References 42 publications

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“…The sorption methods, while requiring excessive amounts of water,a re currently preferable for industrial applicationsd ue to their simplicity. [17,20] Various adsorbentsh ave been used for the sorption method such as activated carbon, [21] chitosanf ilms, [22] humic acid, [23] modified ceramic [6] and metal (hydr)oxides. [15] Ion exchange resins are also used for vanadium removal, since vanadium forms anionic species at pH > 3a nd cationic speciesa t pH < 2o r3 .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Selective Recovery of Heavy Metal Vanadium Oxyanion from Continuously Flowing Aqueous Streams

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Electrochemical Selective Recovery of Heavy Metal Vanadium Oxyanion from Continuously Flowing Aqueous Streams

et al. 2020

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“…This includes oxides V2O5, VO2, V2O3, and VO, where vanadium is present in oxidation states +5, +4, +3, and +2, respectively. V(V) species are very toxic and their removal from water has been extensively investigated [16]. Also, V(IV) and V(V) species have been defined as particularly toxic in [17].…”

Section: Introductionmentioning

confidence: 99%

Revised Pourbaix diagrams for the vanadium – water system

Povar

Spînu

Zinicovscaia

et al. 2019

J. Electrochem. Sci. Eng.

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The forms of occurrence of vanadium metal are determined by the major chemical reactions in the aquatic environment such as hydrolysis, oxidation, reduction, and precipitation. Depending on pH, potential and total concentration of inorganic ions and organic ligands, vanadium compounds may undergo various transformations to produce a whole range of chemical forms in aqueous systems. In this paper, a novel approach has been applied for calculating potential-pH (Pourbaix) diagrams, based on the developed thermodynamic analysis of chemical equilibria in the V–H2O system. On the basis of currently revised thermodynamic data for V(III), V(IV) and V(V) hydrolysis and original thermodynamic and graphical approach used, the repartition of their soluble and insoluble chemical species has been investigated. By means of ΔG–pH diagrams, the areas of thermodynamic stability of V(IV) and V(V) hydroxides have been established for a number of analytical concentrations of vanadium in heterogeneous mixtures. The obtained results, based on the thermodynamic analysis and graphic design of calculated data, are in good agreement with available experimental data.

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“…The isotherm model BET is a further development of the Langmuir model, with the difference that it examines multilayer adsorption. The BET model in aqueous systems is described by Equation () 28 ;

q_{e} = \frac{q_{italicBET} k_{1} C_{e}}{(1 - k_{2} C_{e}) (1 - k_{2} C_{e} + k_{1} C_{e})},

where q e is the equilibrium adsorption capacity (mg/g), C e is the equilibrium concentration in solution (mg/L), q BET is monolayer adsorption capacity (mg/g), k 1 and k 2 are the constants of the equation BET (L/mg). q BET and k 1 are physically comparable to the maximum adsorption capacity and Langmuir content, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In the Freundlich model, multilayer adsorption is assumed to occur on an inhomogeneous surface and ultimately increases with increasing concentration. The Freundlich model is described by Equation () 28 ;

q_{e} = K_{F} C_{e}^{\frac{1}{n}},

where K F is the Freundlich constant and n is a dimensionless constant. The parameters obtained by fitting the experimental data to the isotherm models at different temperatures are listed in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

Najafi

Sharifian

Asasian‐Kolur

2022

Env Prog and Sustain Energy

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Due to the worldwide concern about emerging contaminants in aqueous systems, the main objective of the present study is the adsorption of gemifloxacin (GMF), a fluoroquinolone-type antibiotic, by rice straw-based activated carbon. The rice straw chemically activated with K 2 CO 3 (RSAC) had very high carbon content (>80%) and low silica content (due to the extraction step after activation), high specific surface area (1668 m 2 /g), and oxygenated functional groups. The GMF adsorption capacity of RSAC was relatively dependent on the initial pH of the solution and highly dependent on the adsorbent dose. The pseudo-second order model and the BET isotherm models were the best models for predicting adsorption's kinetic and equilibrium behaviors. The maximum monolayer adsorption capacities of RSAC at 25, 35, and 45 C were 565.6, 552.4, and 525.8 mg/g, respectively. The thermodynamic parameters indicated a spontaneous and exothermic character of the GMF adsorption process. n-π, π-π, electrostatic interactions, and hydrogen bonding were demonstrated as probable mechanisms involved. Thermal regeneration of GMF-saturated RSAC at 550 C resulted in perfect adsorbent regeneration in the second cycle and reasonable performance in the third cycle.

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Vanadium removal from aqueous solutions by adsorption onto chitosan films

Cited by 35 publications

References 42 publications

Electrochemical Selective Recovery of Heavy Metal Vanadium Oxyanion from Continuously Flowing Aqueous Streams

Electrochemical Selective Recovery of Heavy Metal Vanadium Oxyanion from Continuously Flowing Aqueous Streams

Revised Pourbaix diagrams for the vanadium – water system

Gemifloxacin removal from aqueous solution by rice‐straw based activated carbon: Batch adsorption and thermal regeneration

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