Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

Bao, Shenxu; Tang, Yongping; Zhang, Yimin; Liang, Liang

doi:10.1002/ceat.201500324

Cited by 56 publications

(28 citation statements)

References 163 publications

(171 reference statements)

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“…The Langmuir isotherm is commonly used to describe the monolayer adsorption on the homogeneous sites of sorbent . The good fitting of the sorption to the Freundlich isotherm suggests that the sorption of salt ions on the two electrodes is not restricted to one specific class of sites and the adsorption of ions occurs on a heterogeneous surface by monolayer sorption .…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

2018

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Multiwalled carbon nanotubes (MWCNTs) were treated by nitric acid to probe the effect of nitric acid modification on their properties and desalination performance in capacitive deionization (CDI). The nitric acid modification exerts a slight influence on the morphologies, specific surface area, and pore properties of the MWCNTs but can increase the amount of oxygen-containing functional groups and then obviously enhance the specific capacitance of the electrodes. Thus, the desalination efficiency can be significantly improved as the modified MWCNTs serve as electrodes in CDI. The adsorption of salt ions on the original and modified MWCNT electrode is fitted well by the Freundlich isotherm other than the Langmuir isotherm.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

2018

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“…In general, the Langmuir and Freundlich isotherm models are widely used to depict the adsorption of metal ions onto SIRs [11,24,25]. Langmuir model is commonly used to describe the uptake of metal ions that occurs on a homogeneous surface by monolayer adsorption without any interaction between the adsorbed ions, and the Freundlich model assumes that the adsorption of metal ions occurs on a heterogeneous surface by monolayer adsorption.…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…Solvent-impregnated resins (SIRs) that were prepared by incorporating extractants onto polymeric matrix have been widely applied in the fields of separation and purification for metals [1][2][3] and organics [4,5] from aqueous solutions, due to their high selectivity, operational simplicity, and environmental friendliness [6,7], which can be traced back to the pioneering work that was conducted by Warshawsky [8], Grinstead [9], and Kroebel and Meyer [10] in the early 1970s. Thus, the preparation and application of the SIRs in analytical and environmental chemistry, hydrometallurgy, and radiochemistry fields are still intensive research topics [11]. However, there are some problems that are embedded in SIRs, such as time-consuming of the impregnation process for the extractants impregnating onto the macroporous matrix, long time of the adsorption equilibrium and low adsorption capacity of the SIRs for metal ions, which may impede the industrial application of SIRs.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency Approach for the Synthesis of N235-Impregnated Resins and the Application in Enhanced Adsorption and Separation of Vanadium(V)

et al. 2018

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Trialkylamine (N235)-tributyl phosphate (TBP) impregnated resins (N-TIRs) were prepared, so as to evaluate the effects of the addition of TBP on the preparation and adsorption performance of N235-impregnated resins (NIRs). The results show that TBP can obviously increase the impregnation ratio and shorten the impregnation equilibrium time of the N-TIRs when compared to that of the NIRs (57.73% versus 36.95% and 5 min versus 240 min). It is confirmed that TBP can interact with N235 during the impregnation process, which shorten the adsorption equilibrium time and increases the adsorption capacity of the N-TIRs for V(V) when compared to that of the NIRs (6 h versus 10 h and 50.95 mg·g−1 versus 46.73 mg·g−1). The kinetics fitting results demonstrate that the adsorption of V(V) onto N-TIRs and NIRs all conform to pseudo-second order kinetic model and chemical reaction is the rate-limiting step of the whole adsorption process. In the meanwhile, the reaction constant (Ks) implies that the chemical reaction rate of V(V) with the impregnated extractants in N-TIRs is faster than that in NIRs. The N-TIRs present higher stability and selectivity than NIRs. This study manifests that the addition of a secondary reagent may be a potential and novel technique on the preparation of SIRs and the enhancement of adsorption and separation for ions.

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“…Thus, pine bark is one of the most abundant agro‐industrial wastes which has been mostly used as fuel. In a previous study , it was found that after chemical modification pine bark could be an interesting biosorbent for uptaking Cr(III) when compared not only with similar biosorbents but also with ion‐exchange resin , .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Sorption Mechanisms of Cr(III) by Chemically Modified Pine Bark

2018

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The mechanisms of Cr(III) sorption by pine bark treated chemically (MPB) with NaOH were investigated. The removal of Cr(III) was found to be strongly dependent on the initial pH. Thus, a model was developed for describing the adsorption as a function of this variable. The removal efficiencies as a function of the adsorbent dosage for different pH values were predicted. The equilibrium data were well fitted by the modified Langmuir isotherm. Ion exchange at equilibrium suggested chromium uptake and Ca 2+ release occurs approximately according to the stoichiometry of the equilibrium reactions. Cr(III) desorption from MPB with chelating agents was not very effective while high efficiencies were achieved with HNO 3 solutions.

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Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

Cited by 56 publications

References 163 publications

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

Characteristics of Nitric Acid‐Modified Carbon Nanotubes and Desalination Performance in Capacitive Deionization

A High-Efficiency Approach for the Synthesis of N235-Impregnated Resins and the Application in Enhanced Adsorption and Separation of Vanadium(V)

Insights into the Sorption Mechanisms of Cr(III) by Chemically Modified Pine Bark

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