Mechanism of simultaneous removal of Ca2+, Ni2+, Pb2+ and Al3+ ions from aqueous solutions using Purolite® S930 ion exchange resin

Stefan, Daniela Simina; Meghea, Irina

doi:10.1016/j.crci.2013.09.010

Cited by 28 publications

(8 citation statements)

References 35 publications

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“…A similar behavior was observed by Stefan and Meghea (2014) [52] for the removal of Ca 2+ , Pb 2+ , and Ni 2+ cations using Purolite1 S930 ion exchange resin. The authors supposed that, with the pH increase, the proton concentration inside the aqueous medium was lower.…”

Section: Effect Of Ph Solutionsupporting

confidence: 87%

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Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Aziam,

Stefan,

Nouaa

et al. 2024

Nanomaterials

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The aim of this work is to characterize and evaluate the retention of Cu2+ and Ni2+ from single and binary systems by alginate–−Moroccan clay bio−composite with the utilization of calcium chloride as a cross−linking agent, using the ionotropic gelation method. The bio−nanocomposite was characterized by using a variety of techniques (SEM, EDX, XRD, and pHPZC). The efficiency of the adsorbent was investigated under different experimental conditions by varying parameters such as pH, initial concentration, and contact time. To demonstrate the adsorption kinetics, various kinetic models were tried and assessed, including pseudo−first−order, pseudo−second−order, intraparticle diffusion, and Elovich models. The research results show that the adsorption process of Cu2+ and Ni2+ metal ions follows a pseudo−second−order kinetic model, and the corresponding rate constants were identified. To evaluate the parameters related to the adsorption process in both single and binary systems, different mathematical models of isotherms, such as Langmuir, Freundlich, Temkin, and Dubinin–−Radushkevich, were investigated. The correlation coefficients obtained showed that the most suitable isotherm for describing this adsorption process is the Langmuir model. The process is considered to be physical and endothermic, as suggested by the positive values of ΔH° and ΔS°, indicating increased randomness at the solid/liquid interface during Cu2+ and Ni2+ adsorption. Furthermore, the spontaneity of the process is confirmed by the negative values of ∆G°. The bio−nanocomposite beads demonstrated a maximum adsorption capacity of 370.37 mg/g for Ni2+ and 454.54 mg/g for Cu2+ in the single system. In the binary system, the maximum adsorption capacities were observed to be 357.14 mg/g for Ni2+ and 370.37 mg/g for Cu2+. There is significant evidence for the use of alginate–−Moroccan clay bio−nanocomposite as a cost−effective alternative adsorbent for the efficient removal of metal ions in single and binary systems.

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Section: Effect Of Ph Solutionsupporting

confidence: 87%

“…The kinetic equations below show the linear and non-linear form of the pseudo-first-order model [ 21 , 52 , 53 , 54 , 55 , 56 ]:

…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Aziam,

Stefan,

Nouaa

et al. 2024

Nanomaterials

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“…Botelho Junior et al studied the difference between ferric iron and ferrous iron in nickel laterite leach waste for copper recovery using Lewatit ® TP 207, in which chelating resin efficiency increases when iron is present as ferrous iron. In solution with Fe(III), copper recovery was 48.72%, while solution with Fe (II) copper recovery was 61.32% [16][17][18]. A way to convert ferric iron to ferrous iron is using a reducing agent.…”

Section: Introductionmentioning

confidence: 99%

Pre-Reducing Process Kinetics to Recover Metals from Nickel Leach Waste Using Chelating Resins

Botelho

Dreisinger

Espinosa

et al. 2018

International Journal of Chemical Engineering

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The main problem of the separation process from nickel mining using the ion exchange technique is the presence of iron, which precipitates in pH above 2.00 and causes coprecipitation of copper and cobalt. Chelating resins have the main advantage of being selected for a specific metal present in solution. Studies have been developed to increase the efficiency of metals recovery using chemical reduction and the ion exchange process to recover metals. The aim of this work was to use sodium sulfite as a reducing agent to convert Fe(III) to Fe(II). Chelating resins Lewatit® TP 207, selective for copper, and Lewatit® TP 220, selective for nickel and cobalt, were studied. Batch experiments were performed to study the effect of pH with and without sodium sulfite. Results indicated that the industrial process has increased efficiency when the reducing process is applied.

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“…The pH can have an impact on the structure of both adsorbent and adsorbate, as well as on the adsorption mechanism. This is due to the existence of protons that can modify the charge on the surface of adsorbent [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Alginate–Moroccan Clay, New Bio-Nanocomposite for Removal of H2PO4−, HPO42−, and NO3− Ions from Aqueous Solutions

Aziam,

Stefan,

Aboussabek

et al. 2023

Polymers

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The aim of this work is to synthesize and characterize alginate–Moroccan clay bio-composite in order to improve our understanding of the adsorption of inorganic pollutants found in textile effluents. Characterization of the bio-composite used was carried out using a variety of techniques (IR-TF, SEM, DRX, and pHZPC). The influence of the medium’s physico-chemical parameters (temperature, pH, initial concentration, etc.) on the retention of inorganic pollutants was also studied. Studies of adsorption and inorganic pollutants such as orthophosphate (H2PO4− and HPO42−) and nitrate (NO3−) ions were carried out, using simple solutions from the laboratory, in a batch system. This study explored the impact of adsorbent dose, contact time, solution pH, and temperature on the adsorption process. Various kinetic models, including pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich models, were tested and evaluated, to illustrate the adsorption kinetics. This study’s findings demonstrated that the adsorption process follows second-order kinetics, with associated rate constants successfully determined. The correlation coefficient for the pseudo-second-order kinetic model is nearly equal to 1 (>0.98), and the value of theoretical adsorption capacity (qe,the) is comparable to the experimental one (qe,the = 58.14 mg/g for H2PO4−, qe,the = 54.64 mg/g for HPO42−, and qe,the = 52.63 mg/g for NO3−). Additionally, the adsorption equilibrium was investigated through the application of various mathematical models, including the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models, to assess the mechanistic parameters associated with the adsorption process. Among these models, the Langmuir isotherm emerged as the most suitable one for characterizing the adsorption of H2PO4−, HPO42−, and NO3− ions using bio-nanocomposite beads. The maximum adsorbed amounts of metal ions by the bio-nanocomposite used were 625 mg/g for H2PO4−, 909.09 mg/g for HPO42−, and 588.23 mg/g for NO3− from the batch system. The endothermic and physical nature of the adsorption is suggested by the positive values of ΔH°, which is consistent with experimental findings. The adsorption process is spontaneous, as evidenced by the negative ΔG° values. Positive ΔS° values indicate increased randomness at the solid/liquid interface during adsorption of ion-organic ions onto the engineered bio-nanocomposite. The obtained results demonstrated that, from a scientific perspective, alginate–Moroccan clay bio-nanocomposites exhibit a highly significant adsorption capability for the removal of oxyanions in aqueous environments.

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Mechanism of simultaneous removal of Ca2+, Ni2+, Pb2+ and Al3+ ions from aqueous solutions using Purolite® S930 ion exchange resin

Cited by 28 publications

References 35 publications

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Pre-Reducing Process Kinetics to Recover Metals from Nickel Leach Waste Using Chelating Resins

Alginate–Moroccan Clay, New Bio-Nanocomposite for Removal of H2PO4−, HPO42−, and NO3− Ions from Aqueous Solutions

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