Cationic Resin Research Articles

Use of Nanofiltration and Demineralization of Industrial Effluents : Evaluation of the Feasibility of Reuse for Irrigation of Green Spaces

Assessment of the applicability of neutralization station wastewater in combination with nanofiltration for watering green spaces. To achieve this objective, various analyses were carried out, including pH, conductivity, suspended solids, chlorides, nitrates, sulfates, bicarbonates, silica, total nitrogen, BOD5, COD and heavy metals. The results of our analyses showed that most of the parameters analyzed complied with the standards in force for water intended for the irrigation of green spaces. A few values slightly outside the recommended ranges were observed, mainly due to the cationic resin regeneration process. With regard to heavy metals, the levels found were all below the regulatory threshold values, indicating a low risk of contamination by these elements. On the basis of these results, a number of recommendations were made to demonstrate the feasibility of using discharges from the neutralization pit for watering green spaces, subject to the implementation of appropriate treatment and monitoring measures.

Optimization of Fenton process conditions in winery wastewaters treatment followed by ion exchange process to recover iron

Fenton’s oxidation has been widely studied for treatment of winery wastewater (WW). However, the generation of iron sludges imposes a significant drawback for this treatment process. Consequently, an integrated methodology was tested involving the application of ion exchange resins that recover dissolved iron without sludge production in Fenton’s Process. The aim of this study is optimizing Fenton oxidation for the abatement of COD in WW. Using a methodology design of experiments (DOE), Fenton process was able to remove up to 57% of chemical oxygen demand (COD) when pH 3, reaction time 1 h, [H2O2] = 0.15 molL−1 and [H2O2]/[Fe2+] = 15 were applied. A cationic ion-exchange resin, Dowex Marathon C, was able to recover iron present in the effluent after the oxidation process. Continuous and discontinuous trials were conducted in this scope for the synthetic solution and the real effluent after Fenton. The innovative methodology of using IE to circumvent Fenton's peroxidation limitation will surely lead to a widespread application of IE in the treatment of industrial effluents.

Cationic resin polymer A®IRC-50 as an effective adsorbent for the removal of Cr(III), Cu(II), and Ag(I) from aqueous solutions: A kinetic, mathematical, thermodynamic and modeling study

Adsorption has emerged as a reliable and cost-effective method for the depollution of wastewater containing multivalent heavy metals. However, there is still a need to optimize the process to achieve better efficacy. Consequently, This study focuses on the adsorption of three different metal ions, namely Cr (III), Cu (II), and Ag (I), using a cationic resin polymer called A®IRC-50 as the organic adsorbent. The high adsorption capacity of this polymeric material was investigated concerning various physicochemical parameters, including the dose of the cationic adsorbent, contact time, initial pH of the metallic solution, concentration of multivalent metals, and temperature (from 25 °C to 55 °C). The characterization of the adsorbent was performed using GTA/GTD, SEM spectroscopy, and EDX analysis. The kinetics of the adsorption phenomenally were evaluated exploited pseudo-1st-order and pseudo-2sec-order models. The maximum amount of adsorption of the different metals studied are estimated at 171.33 mg.g−1 of the Cu(II), 90.16 mg.g−1 of the Cr(III) and 87.55 mg.g−1 of the Ag(I) at m = 0.1 g. The adsorption mechanism was determined by employing isothermal adsorption models such as Langmuir, Freundlich, and Temkin. The experimental results present demonstrated that the adsorption kinetics of the metals on the cationic polymer A®IRC-50 resin followed the pseudo-second-order model(100 mg.g−1 of Cr(III), 166.67 mg.g−1 of Cu(II) and 100 mg.g−1 of Ag(I)). The adsorption isotherms of the multivalent metal cations by the cationic polymeric A®IRC-50 resin were well-described by the Freundlich model, and the maximum capacities of the adsorption process were determined using the Freundlich isothermal model equation. The adsorption of multivalent heavy metals on the artificial polymer was found to be spontaneous and endothermic. The obtained ΔH values (46.85 Kj.mol−1, 31.61 Kj.mol−1 and 35.50 Kj.mol−1 of the various metals Cr(III), Cu(II) and Ag(I) respectively), suggest that the interactions between the cationic polymer A®IRC-50 resin and the multivalent heavy metals are primarily physical. Finally, various thermodynamic technics between three metals study indicate as well ΔG° (−0.83 at −5.64 kJ. mol−1) that the adsorption is impetuous and endothermic.

Experimental study of repairing rust-cracked reinforced concrete by electrophoresis deposition method

The rusting and cracking of reinforced concrete structures cost billions of dollars around the world every year, and there is a lack of targeted repair methods. In this study, we first put forward an electrophoretic deposition repair method using a high-performance colloid solution containing water-based cationic epoxy resin. The effect of electrophoretic deposition on rust-cracked reinforced concrete was studied. Then, the mesoscopic and microscopic morphologies of the repaired concrete surface, cracks, and defects at the interface of reinforced concrete were examined. Finally, the mechanism of electrodeposition was discussed, and the related reactions were summarized (ionization, electrolysis, electrophoresis, electrodeposition, electroosmosis, and curing reaction). The results show that electrophoretic deposition successfully increased the internal compactness, unconfined compressive strength, and split tensile strength of reinforced concrete, while greatly reducing the water absorption and the accelerated carbonation depth.

A new phosphate purification method for igneous weathering profiles.

The oxygen isotope composition of phosphate (δ18 OPO4 ) is widely employed for reconstructing paleotemperature and tracing biogeochemical phosphorus cycling. However, existing phosphate purification protocols do not work well for igneous rocks and igneous weathering profiles (IWPs). A reliable purification method is needed for measuring δ18 OPO4 in these materials. Our phosphate purification method includes two steps of cation exchange resin treatment separated by a step of calcium phosphate precipitation (R-Ca-R method). In addition, the silver phosphate precipitation in our procedure is featured by slow evaporation to crystallization until the appearance of ammonium nitrate or silver nitrate crystals. We evaluated our methods on weathered and pristine igneous rocks, phosphorite rocks, KH2 PO4 , and (NH4 )2 HPO4 solutions. Our purification method converted over 99.9% phosphate in solution to calcium phosphate, which can be easily decalcified by cation resin. The improved silver phosphate precipitation method produced high phosphate yields (97.1%-99.5%) and retained original δ18 OPO4 within analytical uncertainty (2σ = 0.6‰). We applied the purification and precipitation method on five igneous rocks and IWPs, and obtained δ18 OPO4 values ranging from 6.4‰ to 8.0‰. Duplicate phosphate extractions yielded δ18 OPO4 values differing by less than 0.3‰. We developed a new phosphate purification method that is applicable to phosphate extraction in igneous rocks and IWPs. We also proposed a reliable indicator for the termination of silver phosphate precipitation. Our method can achieve high phosphate yield and reproducible δ18 OPO4 value.

Construction of arsenic selective chelating resin with iron precursor for removal of low-concentration arsenic: Breakthrough modeling and field deployment

The presence of exorbitant arsenic contamination in the aquatic environment causes astronomically immense health quandaries affecting millions of people, which may lead to death in the case of prolonged indigestion of arsenic-containing drinking water. Herein, we are reporting porous chelating resin with an iron precursor for the removal of arsenic ions from water. Weak acid cation resin was functionalized under varying experimental conditions to get a suitable resin with high arsenic uptake. The theoretical results revealed that the maximum Langmuir adsorption capacities of 3.27 mg g−1 and 1.13 mg g−1 were achieved for As(V) and As(III), respectively. The kinetics of adsorption followed the pseudo-second-order (PSO) model with a high determination coefficient (R2) of 0.9963 and 0.9895 for As(V) and As(III), respectively. The Adams-Bohart, Thomas, Yoon-Nelson, and Pore diffusion models were used to identify the breakthrough curve in the fixed bed adsorption column. The column performance improved with a larger bed height (55 cm), low concentration of influent (0.25 mg L−1), and low flow rate of influent (80 mL min−1). Under this condition, the breakthrough time and exhaustion time were 314 min and 408 min for As(V) and 124 min and 185 min for As(III), respectively.

DECOMPOSITION MECHANISM AND DISSOCIATION CONSTANTS OF BICARBONATE IONS

Using carbonic acid to explain pH changes in aqueous solutions is invalid due to its undetectability under normal temperature and pressure conditions. Instead, two reversible reactions involving the decomposition of HCO3- ions into OH- and CO2 or H+ and CO32- should be employed. The second reaction (H-mechanism) is well known as the basis for the second dissociation constant of “carbonic acid”. For the first reaction (OH-mechanism), the formula has been derived from the first imaginary constant of the same acid. That is, the researchers experimentally determined the proposed constant based on the results of pH value, CO2 and HCO3- concentrations, but calculated the imaginary constant from these values. The pH increase observed following filtration on the cationic resin in Na+ form is attributed to the weakened HCO3- decomposition via the H-mechanism, resulting in decreased H+ and CO32- concentrations. A significant decrease in Ca2+ concentration (from 5.0 to 0.05 mmol/dm3) is the main reason for the observed phenomenon, as it leads to a decrease in the driving force of calcium carbonate formation. The mechanism of bicarbonate ions decomposition based on two reactions has been confirmed experimentally. An increase in the pH of the mixture of CaCl2 and NaHCO3 solutions (both with the same pH and concentration) indicates the H-mechanism, while a decrease in the pH indicates the OH-mechanism decomposition of bicarbonate ions. The pH value at which the pH does not change indicates a change in the decomposition mechanism. The change in the HCO3- dissociation mechanism depends on hardness and alkalinity, and the pH of this change decreases from softened water (pH 8.30) to seawater (pH 7.5).

EFFECT OF ADDITION OF WET-STRENGTH AGENT ON TENSILE STRENGTH OF PAPER

Wet-strength paper production is of great significance due to its prominent importance in everyday consumer activities. Recently, market demands for paper with specific properties and purposes are increasing. Production of these paper types is very challenging for the manufacturer since they have to meet very specific demands. Wet-strength paper products include bags that come in contact with moisture and wet products, hygienic and kitchen towels, paper towels, packaging products (packages for liquids, aseptic dishes, and a variety of packaging for food), and other special purposes items (tea bags, coffee filters, paper money, etc.) Throughout this research, the focus was on the effects a wetstrength agent has on the tensile strength of paper. The wet strength property of paper is the ratio between the strength of paper in the wet and dry state. The strength in the dry state comes from the hydrogen bonds present in natural cellulose, while the strength of paper in the wet state requires waterproof (covalent) bonds created by the use of a wet strength agent. The wet strength agent used is a cationic PAE resin. The aim of the work is to determine the optimal amount of agent needed in relation to the required value of the tensile strength property of the paper. The investigation of these influences was carried out on Semi Extensible Standard Kraft type of paper in Natron-Hayat.

Iron hydrolysis and lithium uptake on mixed-bed ion exchange resin at alkaline pH

The use of ion exchange resins to remove ionic impurities from solution is prevalent in industrial process systems, including in the primary heat transport system (PHTS) purification circuit of nuclear power plants. Despite its extensive use in the nuclear industry, our general understanding of ion exchange cannot fully explain the complex chemistry in ion exchange beds, particularly when operated at or near their saturation limit. This work investigates the behaviour of mixed-bed ion exchange resin, saturated with species representative of corrosion products in a CANDU (Canadian Deuterium Uranium) reactor PHTS, particularly with respect to iron chemistry in the resin bed and the removal of lithium ions from solution. Experiments were performed under deaerated conditions, analogous to normal PHTS operation. The results show interesting iron chemistry, suggesting the hydrolysis of cation resin bound ferrous species and the subsequent formation of either a solid hydrolysis product or the soluble, anionic Fe(OH)3-.

Effects of microstructure on radiolytic degradation of nuclear grade cationic resins: Gel versus macro-porous

A study was undertaken to evaluate the effect of gamma radiation on the physico-chemical and functional properties of strong cationic ion exchange resins with varying microstructures i.e., gel and macro-porous type, used in purification systems of water-cooled nuclear reactors. The effect of metal ion loading on degradation behavior was probed to simulate the in-situ irradiation scenario in used resin. The resins are expected to undergo physico-chemical and functional degradation due to different oxidizing and reducing species from water radiolysis. Nevertheless, evaluating the extent of degradation based on the morphological and structural differences was of interest. The extent of resin degradation was estimated by analyzing the change in pH, conductivity, total organic carbon (TOC), chemical oxygen demand (COD) and the extent of reactive site loss from the leached ions. Leaching of SO42− ions and the formation of lower organic acids resulted in decreased pH and increased conductivity, TOC and COD values. The change in exchange capacity and physical and structural changes in the irradiated resin's surface was probed with X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR) and Field emission scanning electron microscopy (FE-SEM). Gel resin showed more significant functional group loss, while hydrogen generation was more from macroporous resin due to its more rigid and dense structure.

Contribution of non-ionic interactions on bile salt sequestration by chitooligosaccharides: Potential hypocholesterolemic activity

Chitooligosaccharides have been suggested as cholesterol reducing ingredients mostly due to their ability to sequestrate bile salts. The nature of the chitooligosaccharides-bile salts binding is usually linked with the ionic interaction. However, at physiological intestinal pH range (6.4 to 7.4) and considering chitooligosaccharides pKa, they should be mostly uncharged. This highlights that other type of interaction might be of relevance. In this work, aqueous solutions of chitooligosaccharides with an average degree of polymerization of 10 and 90 % deacetylated, were characterized regarding their effect on bile salt sequestration and cholesterol accessibility. Chitooligosaccharides were shown to bind bile salts to a similar extent as the cationic resin colestipol, both decreasing cholesterol accessibility as measured by NMR at pH 7.4. A decrease in the ionic strength leads to an increase in the binding capacity of chitooligosaccharides, in agreement with the involvement of ionic interactions. However, when the pH is decreased to 6.4, the increase in charge of chitooligosaccharides is not followed by a significant increase in bile salt sequestration. This corroborates the involvement of non-ionic interactions, which was further supported by NMR chemical shift analysis and by the negative electrophoretic mobility attained for the bile salt-chitooligosaccharide aggregates at high bile salt concentrations. These results highlight that chitooligosaccharides non-ionic character is a relevant structural feature to aid in the development of hypocholesterolemic ingredients.

Complex coacervation behavior between cationic polyamides and anionic epoxy resins endowed improved cold-pressing performance of soy protein adhesive

The weak internal cohesion and initial viscosity of soy protein adhesives lead to the poor cold-pressing bonding performance of plywood preparation. This deficiency restricted the assembly efficiency during the sizing process. In this work, we report that electrostatically induced “coacervation behavior” between anionic and cationic resins can be considered a facile strategy to guide the preparation of a high-temperature soy meal (HSM)-based adhesive with improved cold-pressing bonding performance. A robust internal cohesive framework was aided by multiple interactions (e.g., electrostatic interactions, cation-π interactions and hydrogen bonding) with the combination of polyanionic carboxyl-grafted waterborne epoxy resin (WEU) and cationic polyamides resin (PAE) in HSM matrix. The resultant adhesives exhibited improved initial viscosity with cold-pressing bonding shear strength at 1.17 MPa, which is 200.0% higher than that of the pristine HSM adhesive. Ring-opening reactions occurred in the adhesive system under hot-pressing, and the chemical crosslinking network rendered the excellent water-resistance of the adhesives. The maximum wet shear strength of the plywood reached 1.62 MPa, meeting the fundamental requirements (0.7 MPa) for its industrial application. Given its improved cold-pressing and wet bonding shear strength, this effective and novel coacervation strategy is promising to pave the way for high-performance soy protein-based composites in plywood manufacturing.

Highly selective adsorption performance and mechanism of basic amino acids by modified cation resin: Batch experiments and DFT calculation

Basic amino acids have been a major concern due to poor removal and high generation potential for nitrogenous disinfection by-products in drinking water treatment. Conventional cation exchange resins struggle to effectively eliminate basic amino acids owing to their inferior selectivity. In this work, a novel magnetic cation exchange resin (noted as MCER resin) was designed for the selective adsorption of basic amino acids. Batch experiments were conducted to investigate the removal efficiency for basic amino acids (histidine, arginine) and influencing factors (pH, ionic strength). Notably, MCER resin was superior in the removal of histidine (68.5%) and arginine (90%), which significantly reduced the generation of disinfection by-products (DBPs). It exhibited higher resistance to the interference of cations (Na+, Ca2+) at different levels and displayed a promising application potential for simultaneous removal of hardness. The adsorption for histidine and arginine reached equilibrium within 140 min and was well defined by pseudo-first order and intra-particle diffusion kinetic models. Furthermore, the reusability of MCER resin was elucidated after five consecutive adsorption-desorption cycles and the selective adsorption mechanism was determined through various pathways such as electrostatic attraction, hydrogen bonding and ion exchange, as evidenced by XPS and DFT calculations.

Quantification of environmental impact potentials within the processes of industrial wastewater treatment system

New innovative management system of industrial wastewater is vital to address the current water demands, energy generation, resource conservation, and mitigating environmental impact from the wastewater treatment processes. For these reasons, the impact assessment of industrial wastewater treatment plant is imperative. Here, we quantified the environmental impact potentials within the processes in the wastewater treatment system considering the life cycle perspective. The treatment system comprises chemical and biological phases. The findings showed that hazardous waste (53.4%) appears as the major contributor of the impact potentials, followed by chemical consumption (38.3%), and electricity (7.5%). Other elements such as activated carbon (0.5%), cationic resin (0.2%), anionic resin (0.03%), and enzymes (0.009%) are relatively smalls in terms of the impact. The reuse of hazardous waste for heat recovery system is one of the initiatives to reduce the impact from hazardous waste generation by 12.2% for 1 m3 of treated water. This assessment may serve as a snapshot on the life cycle perspective of industrial wastewater management system in line with circular economy model that emphasizes rethink, reduce, reuse, and recovery efforts in industrial wastewater treatment management systems.

Rapid acquisition of absorption spectra to monitor proton migration in nanoliter space using the RGB-spectrum-conversion method with a 10ms interval.

Acquisition protocol of absorption spectra at nanoliter spaces from the RGB values preserved in video data at 10ms intervals was established using the principal-component-analysis-based RGB-conversion method. Proton behavior was monitored using a camera to acquire the video footage to monitor colorimetric change in the nanoliter space. The RGB values observed in the video were converted into a score vector using a conversion matrix. A linear combination of the predetermined loading vectors with the score values was calculated to reproduce the absorption spectra. The reproduced absorption spectra correlated well with those acquired using a conventional spectrophotometer during a short period. This method was applied to monitor the proton diffusion from a single cationic ion-exchange resin into hydrogels at low concentrations. The rapid acquisition and quick response of this method may enable the monitoring of the initial diffusion of protons, which is challenging with conventional spectrophotometry and electrochemical approaches.

Catalyst deactivation of cation‐exchange resin in cross‐aldol condensation of acetaldehyde to methyl pentenone

AbstractThe aldol condensation of acetaldehyde with methyl ethyl ketone was studied for the production of methyl pentenone in the presence of cationic resin, Amberlyst‐15. Methyl pentenone (MPO) is an important intermediate used for the synthesis of Iso‐E‐Super, which is a precursor in sandalwood fragrances. Amberlyst‐15 used as an alternative heterogeneous catalyst for conventional corrosive sulphuric acid was found to get deactivated with prolonged use. In this work, major possible causes of catalyst deactivation, such as desulphonation, coking, grafting, metal deposition and thermal degradation, are investigated. Characterization of fresh and used catalysts is performed for surface area, mass deposited and elemental composition (CHNS and ICP). The results confirm that multiple causes, i.e., desulphonation, metals exchange and oligomers deposition, are responsible for the catalyst deactivation. The presence of metal promotes desulphonation; the desulphonation along with metal exchange appears to be the major contributors to catalyst deactivation; and avoiding exposure to metal impurities may enhance the catalyst life significantly. Catalyst regeneration was also explored, and the catalyst site density is reclaimed from 0.5–0.6 meq/g to 4.1–4.2 meq/g, which is closer to the fresh Amberlyst‐15 (4.5–4.6 meq/g). The study provides a way to develop the resin‐based green technology for catalytic reactions.

Preparation of a new gel-type lignin-based cationic adsorption resin for efficient removal of Ca2+ from aqueous solutions

Presently, most studies on modified lignin focused on the adsorption to heavy metal cations, but rarely to Ca2+ in hard water. Therefore, this work prepared a new gel-type lignin-based cationic adsorption resin (E-LSAF) through the crosslinking and curing of alkali lignin grafted by sodium sulfite sulfonated acetone to remove Ca2+ in water. Under the determined optimum synthesis conditions, E-LSAF with a highest sulfonic group content of 1.99 mmol/g was obtained. Structural and physicochemical measuring results showed E-LSAF was a gel-type resin, owning strong hydrophilicity, high mechanical strength, excellent thermal stability and acid-alkaline resistance. Adsorption results indicated the adsorption of E-LSAF to Ca2+ was well-fitted by Langmuir model, and the maximum adsorption capacity reached 45.8 mg/g. Pseudo-second-order model can describe this adsorption process well, suggesting it a chemisorption process. Dynamic column adsorption results showed E-LSAF could transform hard water into soft or even very soft water. The regeneration efficiency still maintained 80 % after 5 cycles. The adsorption mechanism was attributed to electrostatic attraction, ion exchange and complexation. This work provided a high-performance lignin-based cationic adsorption material with high adsorption capacity to Ca2+ and excellent acid-alkaline resistance, which filled the research gap of using modified sulfonated lignin to remove Ca2+ from water.

Preparation of recycled poly s tyrene derivatives to remove heavy metal ions from contaminated water

In recent years, numerous researchers have concentrated on the process of turning waste into usable materials. Polystyrene and its modifications have received great attention over the past few decades due to their outstanding ion exchange behavior toward various toxic heavy metals in aqueous solutions. Therefore, this study is concerned with the preparation of three different cationic polymeric resins for the removal of Pb2+, Cd2+, and Fe3+ heavy metal ions from their contaminated water samples based on the sulfonated single-used polystyrene teacup waste (SPS), which was used to prepare sulfonated polystyrene-g-acrylamide monomer (SPS-g-Acryl) and sulfonated polystyrene-g-chitosan (SPS-g-Chit) using commercial chitosan (DD=85%) originally extracted from shrimp cortex. The concentrations of the selected heavy metal ions were measured before and after each experiment with a flame atomic absorption spectrometer (F-AAS). The analytical studies started by exploring the influence of pH (2, 4, 6, and 8) on removing the heavy metal ions Pb2+, Cd2+, and Fe3+ from their aqueous solutions. The obtained results revealed that as the pH of the analyzed ion solution is increased, the removal efficiency for ions increases. All three resins (SPS, SPS-g-Acryl, and SPS-g-Chit) had different removal efficiencies for the investigated ions, with SPS-g-Chit resin.

Preparation of fluorine and silicon modified cationic acrylic resin and its application in cathodic electrodeposition coatings

Purpose Fluorinated silicon polymers are expected to be adopted in specific coatings to afford outstanding advantages, such as high chemical and photochemical resistance, low surface tension and low refractive index. The modified acrylate resin is prepared via solution polymerization of fluorine and silicon monomers, acrylate monomers and other functional monomers. The purpose of this paper is that the fluorine and silicon monomers such as vinyltriethoxysilane (VTES) and hexafluorobutyl methacrylate (HFMA) and some cheap monomers such as styrene are used to prepare the cationic acrylic resin. Design/methodology/approach The fluorine and silicon modified cationic acrylic resin is prepared via solution polymerization technology, which uses butyl acrylate (BA), methyl methacrylate (MMA), styrene (St), HFMA, VTES, dimethylaminoethyl methacrylate (DMAEMA) and hydroxypropyl methacrylate (HPMA) as the co-polymerized monomers, propylene glycol monomethyl ether (PGME) as solvent and 2,2-Azo-bis-iso-butyronitrile (AIBN) as the initiator to create a resin to introduce the Si–O and C–F into the polymer chains. The cathodic electrodeposition (CED) coatings were prepared by mixing the synthetic resin and blocked isocyanate. Findings The influence of the amounts of HFMA and VETS on the resin and the resultant CED coatings is investigated in detail. The optimum amounts of HFMA and VETS are obtained, which is 7–8% and 4–5%, respectively. The hydrophobicity and the acid and alkaline resistance of the film are improved when VETS and HFMA are introduced to co-polymerize with other monomers. Originality/value The fluorine and silicon monomers such as VTES and HFMA and some cheap monomers such as styrene, which are used to prepare the cationic acrylic resin, are seldom reported in the open literature.

Cationic Polystyrene-Based Hydrogels: Low-Cost and Regenerable Adsorbents to Electrostatically Remove Nitrites from Water.

Nitrites are metastable anions that are derived from the oxidation of ammonia by agricultural pollution, sewage, decaying protein, and other nitrogen sources. They are a recognized environmental issue due to their role in eutrophication, as well as in surface and groundwater contamination, being toxic to almost all living creatures. Recently, we reported on the high efficiency of two cationic resins (R1 and R2) forming hydrogels (R1HG and R2HG) by dispersion in water in removing anionic dyes from water by electrostatic binding. Here, aiming at developing adsorbent materials for nitrite remediation, R1, R2, R1HG, and R2HG were first tested in adsorption experiments in batches monitored by UV-Vis methods, using the Griess reagent system (GRS) in order to assess their removal efficiency by contact over time. Particularly, samples of water appositely contaminated with nitrites were analyzed by UV-Vis before and during treatment with the hydrogels. The initial concentration of nitrites was quantified (118 mg/L). Then, the removal of nitrites over time, the removal efficiency of R1HG (89.2%) and of R2HG (89.6%), their maximum adsorption (21.0 mg/g and 23.5 mg/g), as well as the adsorption kinetics and mechanisms were evaluated. Additionally, R1HG- and R2HG-based columns (h = 8-10 cm, ØE = 2 cm) mimicking mini-scale decontamination systems by filtration were used to rapidly filter samples of water polluted with nitrite that were under pressure. R1HG and R2GH were capable of totally removing nitrites (99.5% and 100%) from volumes of nitrite solutions that were 118 mg/L that is 10 times the volumes of resins used. Additionally, when extending filtration to increasing volumes of the same nitrite solution up to 60 times the volume of resins used, the removal efficiently of R1HG decreased, and that of R2HG remained stable at over 89%. Interestingly, both the worn-out hydrogels were regenerable by 1% HCl washing, without a significant reduction in their original efficiency. There is a lack of studies in the literature reporting on novel methods to remove nitrite from water. R1HG and especially R2HG represent low-cost, up-scalable, and regenerable column-packing materials with promise for applications in the treatment of drinking water contaminated by nitrites.