Chelating Resin Research Articles

Relationship between Hg(II) adsorption property and functional group of different thioamide chelating resins

In order to investigate the effects of different electron donor groups on the Hg(II) adsorption properties of thioamide chelating resin, three similar resins were prepared by modifying chloromethylated (CPS) and ammoniated polystyrene (APS) beads with thiourea (TMCR), ammonium thiocyanate (ATMCR) and carbon disulfide (CDMCR). These resins were characterized with Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The factors affecting Hg(II) adsorption such as dosage, solution pH, initial concentration, temperature and contact time were investigated in detail. The adsorption kinetics of three resins obey the pseudo-second-order model. Isothermal adsorption thermodynamics showed that Hg(II) adsorption by TMCR belongs to a multilayer adsorption process, and that of ATMCR and CDMCR belong to chemical processes. Compared to TMCR and CDMCR, ATMCR has outstanding adsorption and regeneration performance. It has the maximum adsorption capacity (636.94 mg/g at 318 K) and the adsorption rate can still reach 94% after ten cycles. Selective adsorption and DFT calculation show that ATMCR exhibits a specific adsorption for Hg(II) with a stronger coordination than TMCR and CDMCR.

High-efficiency treatment of electroless nickel plating effluent using core-shell MnFe2O4-C@Al2O3 combined with ozonation: Performance and mechanism

Heterogeneous catalytic ozonation (HCO) has been widely applied for the treatment of wastewater. In order to maintain the structural stability and surface catalytic activity of heterogeneous catalysts during the HCO treatment of electroless nickel plating effluent (ENPE), a MnFe2O4-C@Al2O3 catalyst with a core-shell structure was synthesized. MnFe2O4-C@Al2O3 was characterized and applied in the removal of total nickel (TNi) and organic contaminants from actual ENPE, using a coupled system of HCO combined with a magnetic dithiocarbamate chelating resin (MnFe2O4-C@Al2O3/O3-MDCR). Results show that embedding Al2O3 with C and MnFe2O4 significantly increased the TNi removal efficiency (99.3%), enhanced the O3-utilization efficiency and improved the generation of reactive oxygen species (ROS). The reaction rate (k = 0.7641 min−1) and O3-utilization efficiency established for TNi removal (ΔTNi/ΔO3 =0.221) by the MnFe2O4-C@Al2O3/O3-MDCR system, were 220% and 140% higher than the Al2O3/O3-MDCR system, respectively. Catalytic mechanism analysis demonstrated that surface hydroxyl groups, oxygen vacancy, metals, the carbon surface and its functional groups, can all potentially serve as catalytic active sites, with 1O2 and •OH considered to the predominant ROS. Overall, these findings verify that the synthesized MnFe2O4-C@Al2O3 catalyst possesses excellent catalytic capabilities and outstanding structural stability, making it suitable for practical application in the treatment of wastewater effluent.

Selective separation and recovery of vanadium from acid leaching solution of polymetallic black shale as function of aminophosphonic acid

AbstractBACKGROUNDAcid leaching is an effective method to extract vanadium from polymetallic black shale. However, a large amount of metal impurities, especially iron and aluminum, which accompany V, are released during this process.RESULTSIn this study, a aminophosphonic acid chelating resin was used for the differential adsorption and desorption of vanadium, iron and aluminum ions to achieve deep separation and concentration of vanadium ions present in the acid leaching solution of polymetallic black shale. Results showed that vanadium adsorption efficiency reached 90.17% at a pH of 1.8. After differential adsorption and desorption, the V:Fe and V:Al concentration ratios increased from 1.84 to 64.53 and from 0.24 to 37.92, respectively. When a 2.5 mol L−1 NaOH solution was used as desorbent, the separation factors β(V/Fe) and β(V/Al) reached values of 694.22 and 452.29, realizing the selective separation and concentration of vanadium.CONCLUSIONIt was found that the vanadium, iron and aluminum ions were selectively adsorbed onto the phosphonic acid functional groups (PO(OH)2) and amino functional groups (NH). The vanadium ions existed in the form of the polyvanadate (), which can be directionally adsorbed onto PO(OH)2 under POH bond cleavage and coordination of to the unsaturated phosphorus atom and then desorbed through the exchange between hydroxide anions OH− and . The iron and aluminum ions cannot be desorbed by OH− because the iron and aluminum sulfate moieties and were capable of coordinating to the nitrogen atom of the NH group via its lone electron pair. © 2022 Society of Chemical Industry (SCI).

Sorption of Copper Ions from the Nitric Acid Solution of Electrolytic Refining of Silver with Using Chelating Resin Axionit BPA

The article considers a sorption method for extracting copper ions from a model nitric acid solution based on a solution of electrolytic refining of silver with using sorbents with bis-picolylamine functional groups: Dowex M-4195 and AXIONIT BPA. The possibility of extracting copper to residual concentrations in the solution of less than 10 mg/l is shown. The working capacity of both samples under batch conditions, as well as the dynamic exchange capacity and the full dynamic exchange capacity under dynamic сonditions (column test), are determined. The effect of the flow rate of the solution into the column on the kinetics of the sorption of copper ions on AXIONIT BPA is shown. The possibility of desorption of copper with a solution of 3 %, 5 % NH4OH was investigated, and a two-stage scheme of desorption of copper was tested: 5 % and 10 % with a solution of ammonium hydroxide

Highly efficient poly(6-acryloylamino-N-hydroxyhexanamide) resin for adsorption of heavy metal ions

Heavy metal wastewater pollution has become an ecological challenge worldwide. This study reports the development of a novel poly (6-acryloylamino-N-hydroxyhexanamide) (PAHHA) resin for effective adsorption of heavy metal ions, including Cu2+, Pb2+ and Ni2+. The chelating resin was synthesized by the grafting reaction between 6-amino-N-hydroxyhexanamide and polyacrylic resin, thus containing the hydroxamate and acylamino groups. The batch adsorption experiments revealed that the PAHHA resin exhibited an excellent adsorption performance for Cu2+, Pb2+ and Ni2+. The maximum adsorption capacities of Cu2+, Pb2+ and Ni2+ were determined to be 238.59, 232.48 and 115.77 mg·g−1, respectively. Based on the adsorption kinetics, the pseudo-second-order kinetic model was noted to fit well for all metal ions. The metal ion concentration as a function of the equilibrium adsorption capacity fitted well with the Langmuir isotherm, thus indicating the single layer adsorption process. The adsorption mechanism was investigated by using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), density functional theory (DFT) calculations, X-ray photoelectron spectroscopy (XPS) and adsorption isotherms. It was revealed that the PAHHA resin possessed multiple active sites, including –CONHOH, –CONH– and –COOH, which could strongly adsorb the metal ions. Specifically, the –CONHOH group displayed a high affinity by forming a stable five-membered ring with heavy metal ions. Overall, the developed resin exhibits advantages such as simple synthesis, inexpensive raw material and good recyclability, along with high adsorption ability, thus providing a new approach for efficiently treating wastewater contaminated with heavy metal ions.

Characterization of Waste Amidoxime Chelating Resin and Its Reutilization Performance in Adsorption of Pb(II), Cu(II), Cd(II) and Zn(II) Ions

The continuous expansion of the market demand and scale of commercial amidoxime chelating resins has caused large amounts of resin to be discarded around the world. In this study, the waste amidoxime chelating resin was reutilized as an adsorbent for the removal and recovery of Pb(II), Cu(II), Cd(II) and Zn(II) ions from aqueous solutions. The physical morphology and chemical composition of the waste amidoxime chelating resin (WAC-resin) from the factory was characterized by the elemental analyzer, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. The influence of the initial metal ions concentration, contact time, temperature and the solution pH on the adsorption performance of the metal ions was explored by batch experiments. It was shown that the optimal pH was 4. Kinetic studies revealed that adsorption process corresponded with the pseudo-second-order kinetic model and the adsorption isotherm was consistent with the Langmuir model. At room temperature, the adsorption capacities of WAC-resin for Pb2+, Cu2+, Zn2+ and Cd2+ reached 114.6, 93.4, 24.4 and 20.7 mg/g, respectively.

Purification of an iron contaminated vanadium solution through ion exchange resins

• A synthetic vanadium solution contaminated by iron was purified. • Adsorption of V and Fe was tested for three chelating and a strong cation resins. • An increase in pH from 0.50 up to 2.00 favored extraction for both elements. • Vanadium adsorption was better explained by Langmuir isotherms in most of the resins. • IDA functional group resins are promising to recovery vanadium when compared to iron. The present work aimed to study the behavior of four ion exchange resins : Lewatit® ️ MonoPlus TP 209 XL, Lewatit® ️ TP 207, Dowex™️ M4195 (chelating resins) and Lewatit® ️ MonoPlus S 200H (strong cationic exchange resin) in the selective recovery of vanadium from an acid solution containing iron as an impurity. Batch experiments were carried out to evaluate the influence of parameters such as pH (0.50–2.00), resin mass (0.055–9.000 g) and temperature (293–328 K). Ion-adsorption mechanisms of the resins and thermodynamic parameters of adsorption reactions were evaluated. Increasing the pH from 0.50 to 2.00 favored the adsorption of both iron and vanadium by the resins. Chelating resins were more selective for vanadium than S 200H resin. Vanadium adsorption better adjusted to the Langmuir isotherm for the TP 209 XL, TP 207 and S 200H resins, while M4195 adjusted better to the Temkin isotherm. The iron adsorption mechanism, however, varied between the Langmuir, Freundlich and Temkin models. The positive values of ΔH 0 expressed the endothermic nature of the vanadium adsorption process for the three chelating resins and for iron in all of them. Furthermore, negative ΔG 0 values revealed a spontaneous character of the adsorption of both metals to all of the resins. In terms of mass of adsorbed ions, chelating resins showed good selectivity for vanadium compared to iron and these are, therefore, promising to obtain pure vanadium solutions in greater scale operations.

Selective Chelating Resin for Copper Removal and Recovery in Aqueous Acidic Solution Generated from Synthetic Copper-Citrate Complexes from Bioleaching of E-waste

This research focused on batch experiment using a new generation of chelating resins via an ion exchange process to describe the metabolic adsorption and desorption capacity onto iminodiacetic acid/Chelex 100, bis-pyridylmethyl amine/Dowex m4195, and aminomethyl phosphonic/Lewatit TP260 functional groups in bioleaching. The results showed that Dowex m4195 had the highest performance of adsorption capacity for copper removal in both H+-form and Na+-form. Results for Lewatit TP260 and Chelex 100 revealed lower adsorption performance than results for Dowex m4195. The investigation of desorption from chelating resins was carried out, and it was found that 2 M ammonium hydroxide concentration provided the best desorption capacity of about 64.86% for the H+-form Dowex m4195 followed by 52.55% with 2 M sulfuric acid. Lewatit with 2 M hydrochloric acid gave the best desorption performance in Na+-form while Chelex 100 using hydrochloric at 1 M and 2 M provided similar results in terms of the H+-form and Na+-form. As aspects of the selective chelating resins for copper (II) ions in aqueous acidic solution generated from synthetic copper-citrate complexes from bioleaching of e-waste were considered, H+-form Dowex m4195 was a good performer in adsorption using ammonium hydroxide for the desorption. However, chelating resins used were subsequently reused for more than five cycles with an acidic and basic solution. It can be concluded from these results that selective chelating resins could be used as an alternative for the treatment of copper (II) ions contained in e-waste or application to other divalent metals in wastewater for sustainable water and adsorbent reuse as circular economy.

Chelating Resin Based on Silica Gel for Solid-Phase Extraction Coupled with Flame Atomic Absorption Spectrometric Determination of Nickel and Cadmium

Chelating resins offer a fast, accurate and simple method for separation and preconcentration of metal ions at low concentrations prior to their determination by an instrumental method. Silica gel-based chelating resin with chemically immobilized aurintricarboxylic acid was synthesized, characterized and used to determine Ni(II) and Cd(II) at trace levels, coupled with their analysis by flame atomic absorption spectrometer. The resin had sorption capacities of 0.21 mmol g-1 and 0.10 mmol g-1 for Ni(II) and Cd(II), respectively. The analytical detection limit (N = 20) was 1.70 μg L-1 for Ni(II) and 1.90 μg L-1 for Cd(II). The proposed method was useful for the quantitative determination of Ni(II) and Cd(II) in some commercial and water samples.

Thorium ion exchange separation from rare earth elements ore samples following a combined attrition and dissolution procedure

Autogenous grinding (without grinding media) may provide some advantages if satisfactory lixiviation efficiency can be achieved on larger grain sizes. This grinding strategy requires less energy and offers important cost savings and reduction of GHG emissions in the mining industry compared to other commonly used approaches. Two attrition cells (1.2 L, 12 L) were designed to conduct a wet autogenous grinding. The combined grinding and leaching experiments were performed using six Canadian rare earth elements (REEs) ore samples to solubilize the REEs while grinding the ore in a modified attrition mill. Sulfuric, hydrochloric and nitric acids were compared under various operating conditions on three different types of ore samples (carbonatite, sedimentary, peralkaline). The addition of an alkaline step was also investigated. Metals dissolution in the 1.2 L attrition mill with or without NaOH addition (T = 20 °C, solid/liquid ratio = 20%, acid concentration [HNO3] = 7.5 M, time = 1 h) was found effective for the carbonatite ore (solubilization efficiencies of 91–99% Th, 29–32% U, 85–91% LREEs, 84–94% HREEs) and the sedimentary ore (solubilization efficiencies of 89–99% Th, 98–99% U, 22–83% LREEs, 48–99% HREEs). Actinide elements often comprise a significant component in REEs ore samples and are considered impurities. Their presence in primary REE mineral resources is problematic from a regulatory and health physics perspective. To overcome these issues, anionic, cationic and chelating resins were tested to remove Th from the nitric leaching liquor. Best separation results were obtained with the impregnated resin Lewatit VPOC 1026. To the best of our knowledge, this is the first time that Lewatit VPOC 1026 was reported in the literature for Th separation from REEs.

Relationship between Hg(Ii) Adsorption Property and Functional Group of Different Thioamide Chelating Resins

Relationship between Hg(Ii) Adsorption Property and Functional Group of Different Thioamide Chelating Resins

Is a Bispicolylamine-Based Chelating Resin Useful for Recovery of Nickel from Strongly Acidic Bio-Ore Leachate?

Is a Bispicolylamine-Based Chelating Resin Useful for Recovery of Nickel from Strongly Acidic Bio-Ore Leachate?

Ethylenediamine functionalized chelating resin for removal of Cu(II) and Cd(II) from aqueous solution

Ethylenediamine functionalized chelating resin for removal of Cu(II) and Cd(II) from aqueous solution

Pamam Dendrimer Modified Amidoxime Chelating Resin and its Adsorption of U(Vi) in Aqueous Solutions

Pamam Dendrimer Modified Amidoxime Chelating Resin and its Adsorption of U(Vi) in Aqueous Solutions

Boron Continuous Recovery from Brines by the Multicolumn Simulated Moving Bed Process with Boron Chelating Resins

Boron Continuous Recovery from Brines by the Multicolumn Simulated Moving Bed Process with Boron Chelating Resins

Boron Removal from Water and Wastewater using New Polystyrene-Based Resin Grafted with Trometamol and 3-Amino-1,2-propanediol

Boron is one of the significant micronutrients for the plants; however, its excessive concentrations are lethal to plants. The accumulation of boron may cause damage to the liver, kidney, nervous system, respiratory system, digestive system, reproductive system and even threaten human life. Researchers consider using different methods to prepare boron chelating resins. In this work, two innovative, facile, and low‐cost methods were developed to prepare polystyrene-alcohol resins. The KDN and KLA resins had the highest adsorption capacity for boric acid in an aqueous solution at 288 K ,and the adsorption capacity was 36.17 mgand#183;g-1 and 43.47 mgand#183;g-1, respectively. The desorption percentages of boric acid on KDN and KLA resins were 90.75 % and 90.32 % respectively, by using 1 moland#183;L-1 HCl as an eluent. Therefore, KDN and KLA resins have the characteristics of a simple experimental process, large adsorption capacity, high elution rate, reusable, and low production cost. Therefore, it has a high commercial value and development prospects.

An Assessment of Fe and Zn Levels in Selected Herbal Pharmaceutical Products Using ICP-OES and FAAS after Preconcentration with Chelex-100 Chelating Resin

An Assessment of Fe and Zn Levels in Selected Herbal Pharmaceutical Products Using ICP-OES and FAAS after Preconcentration with Chelex-100 Chelating Resin

Removal of Alkali and Alkaline Earth Elements from Cobalt Solutions Using Iminodiacetic Acid Chelating Resin

Removal of Alkali and Alkaline Earth Elements from Cobalt Solutions Using Iminodiacetic Acid Chelating Resin

Insight into the synergistic adsorption-reduction character of chromium(VI) onto poly(pyrogallol-tetraethylene pentamine) microsphere in synthetic wastewater

Facile fabrication of the ultra-high-performance adsorbent can effectively ameliorate the Cr(VI)-pollution elimination in sewage control. Herein, a simple synthesis strategy is proposed to tap a versatile chelating resin poly(pyrogallol-tetraethylene pentamine) (PPTA) with respect to Cr(VI) removal from solution. Multiple changing factors which affect the adsorption behavior of PPTA are explored sequentially, such as initial pH, adsorbate concentration, adsorbent dosage, temperature, foreign ions, etc. The microstructure and functional mechanism of synthetic adsorbent are investigated systematically by means of various characterizations including TEM, EDS, FT-IR, XPS, etc. Consequently, the as-prepared PPTA-3 microsphere by reactant ratio of 1: 1 represents a brilliant synergistic adsorption and reduction result for Cr(VI) by the drastic electrostatic interaction of –NH3+ and –OH2+ groups, including satisfactory removal efficiency which closes to 100 % in low concentration, favorable specificity for the influence from coexistent ions (Mo(VI), Mn(VII), Cl-, Cr(III), etc), and passable recyclability. Following the surpassingly fitting with Langmuir isotherm model, its maximum capacity reaches 714.29 mg g−1 at 30 °C. The removal performance is essentially in agreement with the pseudo-second-order kinetics, simultaneously, suffers the rate-limiting impact depending on intra-particle diffusion process. In brief, this newly developed chelating resin presents an effective means with regard to the Cr(VI)-wastewater treatment or other uses in the future.

Synthesis of a novel Poly-chloromethyl styrene chelating resin containing Tri-pyridine aniline groups and its efficient adsorption of heavy metal ions and catalytic degradation of bisphenol A

A new type of poly-chloromethyl styrene chelating resin (CPS-TA) containing tri-dipyridine aniline side group was synthesized from poly-chloromethyl styrene (CPS) and 4′-(4-aminophenyl)-2,2′:6′,2-tri-pyridine. The results of batch adsorption experiments show CPS-TA chelating resin has excellent adsorption capacity for Cu (II), Ni (II), and Pb (II), and the maximum adsorption capacity is 5.02, 3.38, and 1.27 mmol/g, respectively. The thermodynamic parameters indicate that the CPS-TA chelating resin adsorption for ions is a spontaneous process. CPS-TA chelating resin has good repeated use performance, and the CPS-TA-Cu formed after adsorption has excellent catalytic performance for H2O2 degradation of bisphenol A. The paper simulates the adsorption process through column experiments, indicating CPS-TA chelating resin could be used to adsorb and enrich heavy metal ions in wastewater, which provides a new way to effectively solve the problem of treating wastewater that contains heavy metal ions.