Resin Dosage Research Articles

Synthesis of new functionalized Calix[4]arene modified silica resin for the adsorption of metal ions: Equilibrium, thermodynamic and kinetic modeling studies

In this study, a new efficient resin-based material has been synthesized through the surface modification of silica by functionalized calix[4]arene and applied for the adsorption of metal ions from aqueous media. The synthesis of functionalized calix[4]arene modified silica (FCMS) resin was characterized by FTIR, CHNS, BET surface area, SEM analyses. The FCMS resin has high thermal and chemical stabilities that were checked by the thermogravimetric analysis and various acidic/basic conditions. The efficiency of the FCMS resin was checked by performing a set of batch experiments under optimized parameters such as concentration of the metal solution, pH, resin dosage, time, temperature, and competitive adsorption in mixed solutions. The results showed that better adsorption has been achieved at pH 7, with 25 mg adsorbent dosage and 10 min contact time. The equilibrium kinetic study showed that the metal adsorption follows the pseudo 2nd order kinetic model with quite high coefficients of determination values (R2 > 0.99). The experimental data have been validated by applying three adsorption isotherm models and the results revealed that the Freundlich isotherm model (R2 > 0.99) was the best fit for the adsorption of Cu2+, Pb2+, and Cd2+ ions. However, the sorption energy calculated from the D-R isotherm model for Cu2+, Pb2+, and Cd2+ ions suggested that an ion-exchange mechanism is involved on the surface of the FCMS resin. The thermodynamic data demonstrated that the reaction is spontaneous and endothermic. The FCMS resin was also applied on real wastewater samples and the results demonstrated that the resin has a good ability to treat metal-contaminated wastewater.

La eliminación de metales tóxicos presentes en efluentes líquidos mediante resinas de cambio iónico. Parte XV: Iron(II)/H+/Lewatit TP208

Se ha investigado el uso de la resina de intercambio catiónico Lewatit TP208 en la eliminación de hierro(II) de disoluciones acuosas. En esta eliminación, se han considerado varias variables experimentales, incluyendo, la velocidad de agitación aplicada al sistema, la temperatura, el pH de la disolución acuosa y la dosificación de la resina. Para velocidades de agitación incluidas en el intervalo 300-1200 min-1, el proceso de intercambio catiónico responde al modelo de difusión en la disolución acuosa. El aumento de la temperatura, entre 20 y 60 ºC, va asociado a un aumento de la concentración de hierro(II) cargado en la resina, por lo que el sistema tiene un carácter endotérmico. La variación del pH del medio acuoso hacia pH ácidos (desde 5 a 1) da lugar a una disminución en la carga del metal en la resina. Asimismo, la dosificación de la resina Lewatit TP208 afecta a la eliminación del hierro(II) de la disolución acuosa, los resultados experimentales se ajustan a la isoterma de Freundlich. Los modelos cinéticos asociados a este sistema dependen también de la dosificación de la resina: usando la concentración de resina más alta (1 g·L-1) los datos experimentales se ajustan (r2= 0,999) al modelo de pseudo-segundo orden, mientras que con la concentración de resina más baja (0,13 g·L-1) el modelo cinético es el primer-orden (r2= 0,997). Los resultados experimentales obtenidos con la resina Lewatit TP208 se han comparado con los obtenidos con otras resinas de intercambio catiónico y con el uso de nanotubos de carbono de pared múltiple. El hierro(II), cargado en la resina, puede ser eluido mediante el uso de disoluciones ácidas.

Enhanced removal of uranium (VI) from leach liquors by aniline - polyaniline with Chinese D263B resin

ABSTRACT Aniline and polyaniline was successfully impregnated with Chinese D263B resin and polymerisation prepared via using polyvinyl alcohol as a surfactant and benzoyl peroxide to form impregnated D263B/aniline and D263B/polyaniline were used for enhancing the removal of U(VI) from Abu El Toyour leach liquor. The impregnated D263B/polyaniline was characterised by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). Experimental measurements have been optimised by batch extraction technique such as pH, contact time, initial U(VI) concentration, resin dosage, temperature and eluting agents. It was found that the maximum uptake capacity of Chinese D263B resin is 40 mg/g at room temperature, Chinese D263B resin with aniline is 86.95 mg/g and Chinese D263B resin with polyaniline is 121.95 mg/g. The resulted equilibrium data fitted well with Langmuir isotherm model. From kinetic parameters, it was found that U(VI) adsorption followed the pseudo-second order kinetic model. The thermodynamic parameters ΔH, ΔS and ΔG were also evaluated indicating exothermic, randomness and non-spontaneous adsorption process. U(VI) can be eluted approximately 99% from the loaded D263B/polyaniline using 1 M (1:1) NaCl/H2SO4. Finally, the optimised factors have been applied for enhanced U(VI) removal from Abu El Toyour leach liquor.

Physical-mechanical performance of bamboo scrimbers made from Bambusa rigida

Bamboo scrimbers (BCs) with excellent performances were made from Bambusa rigida (2 to 5 years old). It was found that BCs made from 3-year-old bamboo have the smallest thickness swelling (TS) and width swelling (WS). BCs prepared from 4-year-old bamboo has the maximum compressive strength (CS) and horizontal shear strength (HSS). The maximum modulus of rapture (MOR) and modulus of elastic (MOE) of BCs were observed in BCs made from bamboo with age of 5 years. Overall, the resin dosage of 11% was optimized to fabricate BCs with different maturing bamboo culms; 4-year-old bamboos were recommended to be used as the raw material for the production of BCs.

Experimental and DFT Modeling Studies for the Adsorptive Removal of Reactive Dyes from Wastewater

ABSTRACT The current research demonstrates the adsorptive removal of RY-18, RR-2, RB-13, and RB-171 dyes from wastewater samples using p-diethylaminomethylcalix[4]arene silica appended (DSA) resin. The DSA resin shows high adsorption capacity for reactive dyes during the batch adsorption experiments under the optimized parameters such as DSA resin dosage, pH, and temperature. The adsorption equilibrium results were defined by Irving-Langmuir and Freundlich-isotherm models and it was found that the Freundlich model is the best fit with good multilayer adsorption capacity along with good correlation coefficient value (R2 0.9991) for reactive dyes, while the energy calculated by D-R model describes the adsorption mechanism that is physisorption in nature. Moreover, a thermodynamic study was also performed, which shows that the adsorption of reactive dyes is endothermic and spontaneous in nature. From the kinetic study, it has been revealed that the adsorption takes place by following a pseudo-second-order kinetic model. Besides this, the adsorption phenomenon is explained by density functional theory DFT calculations. The DSA resin was applied onto industrial wastewater samples and it has been observed that above 98% reactive dyes were adsorbed successfully. After washing for regeneration, the DSA resin has above 98% adsorption capacity, which proves that the DSA is a regenerable adsorbent.

Removal of Zn2+ from polyethylene terephthalate (PET) glycolytic monomers by sulfonic acid cation exchange resin

Glycolysis of polyethylene terephthalate (PET) has always been a research hotspot in PET waste recovery due to its high efficiency and sustainability. Zinc acetate (ZnAc2•2H2O) and urea/(ZnAc2•2H2O) are usually regarded as the most promising catalysts for the glycolysis of PET, while the residue of Zn2+ in glycolytic monomers (bis(hydroxyalkyl) terephthalate (BHET)) was identified as a big hassle, which caused the detrimental effect on the chromaticity of down-stream product. However, the removal of Zn2+ from BHET has almost not been reported previously. In the present work, ion exchange was adopted as effective measure to eliminate trace Zn2+ from BHET and more than 99% of Zn2+ can be removed by 001*7 sulfonic acid resin with resin dosage of 1.6 g/L at 298.15 K, 160 rpm for 120 min. Additionally, based on prevailing adsorption kinetics, isotherms, thermodynamic models and various precise instruments, comprehensive adsorption mechanism were exploited. Pseudo-second-order model (R2 > 0.999) and Langmuir model (R2 > 0.999) were found to match well with the experimental data, indicating the sorption of Zn2+ on 001*7 was homogeneous monomolecular layer adsorption and dominated by chemisorption. The thermodynamic model revealed the sorption was thermodynamically spontaneous. Fourier-Transform Infrared Spectroscopy (FTIR) illuminated the sulfonic acid groups on 001*7 resin were the main binding sites for Zn2+. X-ray Photoelectron Spectroscopy (XPS) elucidated ion exchange and electrostatic interaction between the sulfonic acid groups and Zn2+ were responsible for the sorption of Zn2+. All the results obtained can prove 001*7 sulfonic acid resin is an efficient material for removal of Zn2+ from BHET.

An innovative cation regulation-based anaerobic fermentation strategy for enhancing short-chain fatty acids production from waste activated sludge: Metal ion removal coupled with Na+-regulation

This study proposed a cation-regulation strategy based on metal ion removal coupled Na+-regulation for enhancing anaerobic fermentation of waste activated sludge. The optimal treatment condition was: cation-exchange resin dosage of 1.75 g/g SS for 1-day treatment, followed by Na+-enhanced anaerobic fermentation at NaCl concentration of 20 g/L. The CER induced sludge solubilization and the Na+-regulation treatment triggered secondary hydrolysis of CER-solubilized sludge, causing remarkable sludge disintegration and extracellular polymeric substance (EPS) disruption. Numerous SCOD of 6588 mg/L (SCOD/TCOD = 40.6%) was released within 2 days, and the short-chain fatty acids (SCFAs) of 439.9 mg COD/g VSS was produced through 4-day anaerobic fermentation. More than 59% of the SCFAs was composed of acetate and propionate. Nitrogen-free organic matters (i.e. SCFAs and carbohydrates) accounted for 77.9% of SCOD, while considerable sludge solid reduction (51.6% of total VSS) was achievable, which was beneficial for fermentative liquid utilization and sludge disposal.

Katyon Değişim Reçinesi Kullanarak Sulu Çözeltilerden Amonyum Giderimi

Ammonium is one of the main factors responsible for eutrophication of water bodies. Purolite SSTC60 ion exchange resin was used to investigate its potential use on ammonium removal efficiency. The effects of important parameters affecting ion exchange such as ion exchange resin dosage, initial solution pH, temperature, mixing speed and initial ammonium concentration on ammonium removal were investigated. The highest ammonium removal was achieved at pH 7. It was determined that ammonium removal rates increased with resin dosage, mixing speed and temperature increase. It has been determined that temperatures higher than 20°C and mixing speed do not have a significant effect on ammonium removal efficiencies at equilibrium. It was observed that removal efficiencies decreased with increasing initial ammonium concentrations. Pseudo-first order and pseudo-second order kinetic equations were analyzed using nonlinear method to determine the most appropriate kinetic model for ammonium ion removal and found to be compatible with the pseudo-first order kinetic model. Finally, the evaluation of experimental data using nonlinear forms of Langmuir and Freundlich isotherm models determined that the adsorption data fit the Freundlich isotherm model rather than the Langmiur isotherm model.

Adsorption of lanthanum and cerium on chelating ion exchange resins: kinetic and thermodynamic studies

ABSTRACT As the demand for rare earth elements (REE) increases in the coming years, techniques to obtain these elements from different sources may be explored. A hydrometallurgical route may achieve the sustainable approaches signed by countries. For this, separation techniques need to be explored, and chelating ion exchange resins are the most prominent. For this reason, to enhance the possibilities for REE separation, the main focus of this work was to study kinetics models and the thermodynamics of lanthanum and cerium adsorption at laboratory scale under industrially operating conditions. Three different functional groups were evaluated through the chelating resins M4195, TP207, and XUS43605. The effect of pH and resin dosage were evaluated, as well as the kinetic models (pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion) and thermodynamic parameters. The results presented here could be used for industrial applications. Pseudo-second order provided a better fit for both M4195 and TP207, and the intraparticle diffusion fitted better for XUS43605. Thermodynamic experiments have shown that the adsorption of lanthanum and cerium are spontaneous and endothermic. These findings represent the novelty of the present study since it could be used in selective separation of lanthanum and cerium onto chelating resins from primary and secondary sources.

Study on High Performance Polymer-Modified Cement Grouts

Engineers worldwide use various additives or chemical admixtures, such as polymer latexes, to improve the properties of cementitious materials for many construction projects. In this paper, the influence of acrylic or epoxy resin emulsions, along with a polycarboxylate superplasticiser on some basic properties (rheological behaviour, setting time, bleeding, strength) of thick cement grouts is presented. The experimental approach included the use of different polymer dosages mixed with grouts made of low water to cement ratios. The laboratory tests revealed that the incorporation of acrylic resin in grouts marginally affected the viscosity, whereas a significant increase in viscosity was obtained when an epoxy resin was added. Regardless of the prolonged setting times, both polymers improved the development of early or final strength. An acrylic resin dosage ranging from 0.25% to 0.75% and an epoxy resin dosage from 5% to 7.5% displayed the highest strength values, at all water to cement ratios. Additionally, all the polymer-modified grouts exhibited a higher bleed capacity, a fact that is significantly important where the bleeding of the grouts is crucial.

A quantitative study on the amount of water-retaining agent based on adhesive-modified red bed weathered soil

Engineering activities can lead to serious soil erosion problems in red bed areas. To overcome their loose structure, low strength and poor water retention, the red bed weathered soil needs to be modified with adhesives and water-retaining agents. At present, on the premise of applying adhesive, there are few studies on the mechanism of water retention agent to improve soil, and the amount of water retention agent in practical engineering is mainly determined by experience, lacking reliable quantitative basis. Herein, the effects of water-retaining agents on soil quality were quantitatively studied in red bed weathered soil modified by a fixed amount of adhesive. By using shear, permeability, porosity and plant growth tests, we show that the shear strength of the modified soils decreased slightly with increasing resin content, while permeability, porosity and water retention increased, and the growth of plant roots was promoted. Additionally, the processes by which these soil agents improve water retention were investigated, and the control mechanism of the optimum addition amount of water-retaining agent based on the soil water storage and aggregate size was revealed by scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) images, and the optimal water-retaining resin dosage for red bed weathered soil modification is proposed. This study provides a quantitative basis for determining water-retaining agent dosage in the red bed areas of South China and similar areas.

An effective separation of toxic arsenic from aquatic environment using electrochemical ion exchange process

The existence of arsenic in drinking water available for human consumption in multiple nations is among the major health issues globally. Intensified research efforts has made to eradicate arsenic contaminants from water in order to supply people who are living in multiple regions with safe drinking water. A novel process for the deletion of arsenic from aqueous solutions by the electrochemical ion exchange hybrid method were explored in this work. The paper aims to extract arsenic from aqueous solution and recycle it using an electrochemical ion exchange system for industrial purposes. A 3-compartment system was used to demonstrate this process: the center cell is separated from the anodized and cathodic chambers by means of double anionic exchange membrane, a middle cell packed with a strong anion exchange resin, and two rinse compartments, one at each electrode. Efforts are being made to illustrate the optimization of the operating parameters, including concentration, resin dose, pH, contact time, temperature for optimal arsenic removal in batch mode operation. The maximum removal of arsenic obtained is almost 100% and a minimum of 91% extraction at an initial intensity of 5–15 mg /L of arsenic with supply voltage in the 5–20 V range.

The Potential Use of Seaweed (Posidonia oceanica) as an Alternative Lignocellulosic Raw Material for Wood Composites Manufacture

A big challenge in the composites industry is the availability of cheap raw lignocellulosic materials, potential candidates to replace slow growing trees, in order to minimize the production cost. Therefore, a variety of plants were studied and tested worldwide in composites manufacturing. The objective of this study was to investigate the technical feasibility of manufacturing particleboards from seaweed leaves (Possidonia oceanica—PO). The use of such a material may benefit both socioeconomic and environmental development since these leaves settle on seashores and decay. The results showed that an incorporation of up to 10% PO leaves did not significantly affect the mechanical properties of the board. Internal bond strength was more severely affected than the other mechanical properties. The incorporation of PO leaves up to 25% did not significantly improve the dimensional stability of the boards. Markedly, boards made from 50% wood particles and 50% PO leaves showed the best thickness swelling values. It is suggested that higher resin dosage and an alternative resin system, such as isocyanates, may improve the panel properties.

Removal of reactive orange 16 and reactive green 19 using Cyphos IL101-impregnated Amberlite XAD7HP resin in batch and recirculating stirrer vessel.

Reactive dyes are highly soluble in water, and carcinogenic. Therefore, it is essential to remove these dyes from their aqueous solutions. This study focused on the simultaneous removal of reactive orange 16 (RO) and reactive green 19 (RG) dyes from their binary dye solution using Cyphos IL101-impregnated Amberlite XAD7HP resin (ILX7) in batch and recirculating stirrer vessel (RSV). In the batch study, the experimental operating conditions were designed by using central composite design of response surface methodology. Influence of important input variables (RO dye concentration, RG dye concentration, pH, and resin dosage) on the dye adsorption was studied and their values were optimized. At the optimum values of input variables, equilibrium, kinetic, and thermodynamic studies were performed for the binary dye mixture. The equilibrium and kinetic adsorption data were best fitted with extended-Freundlich and pseudo-second-order models, respectively. Now to intensify the process, continuous studies were performed in a RSV at optimum conditions and at different flow rates and stirring speeds. The impregnated resin was regenerated by using 80% v/v ethanol and successfully reused up to 3 cycles with slight decrease in the adsorption capacity.

Sorption and thermodynamic study of nitrate removal by using Amberlite IRA 900 (AI900) resin

Abstract This paper presents the efficiency removal and thermodynamics studies of nitrates by using ion exchange resin, Amberlite IRA 900-Cl (AI900). The effect of experimental factors of contact time resin (1–6 h), resin dosage resin (1–6 g), initial concentration of nitrate influent in the range between 20 and 250 mg/L and temperature between 25 and 65 °C were studied by using a batch sorption method. From the overall study, the data clearly demonstrated that the optimum temperature for the nitrate ions were removed was at 25℃ as the sorption of nitrate decreased when the temperature increased. The sorption managed to obtain 85% removal of nitrates from bulk concentration by using 2 g of AI900 resin in 1-hour contact time. While increasing the contact time of resin until 6 h in 1 g resin and increasing the amount of resin to 6 g of AI900 resin in 1-hour contact time, the adsorption capacity managed to rise at 98 and 97%, respectively. AI900 resin demonstrated an exothermic and spontaneous process of nitrate removal at the varied temperatures as both enthalpy (ΔH°) and entropy (ΔS°) showed negative signs at −26.801 kJ/mol and −43 J/K∙mol respectively. The sorption was feasible and favored at low temperature as the Gibb energy (ΔG°) showed negative sign and decreased with the increasing temperature.

Design and Performance of Ultrathin Overlay Epoxy‐Rubber Concrete

Epoxy‐rubber concrete has a big potential to be used for pavement overlays, but there is currently no appropriate epoxy‐rubber concrete design method and process. To explore the reasonable mix design process of epoxy‐rubber concrete, the ultrathin overlay aggregate gradation and epoxy resin binder with high toughness and durability were selected to carry out the design process investigation of epoxy‐rubber concrete. The performance of epoxy‐rubber concrete was characterized by vibration compaction, repeated load CBR, porosity, Fort Kentucky, uniaxial compression, bending, rutting, antiskid performance, and noise‐reduction performance test. Firstly, the optimum range of the rubber powder replacement rate was determined based on the porosity and deformation characteristics of the aggregate mixture. Then, the amount of epoxy resin binder was further determined based on the porosity and antistripping performance of the epoxy‐rubber concrete. Finally, the mechanical properties, road performance, and functions of epoxy‐rubber concrete were comprehensively considered to determine the optimum rubber power replacement rate obtaining the composition design of epoxy‐rubber concrete. The results showed that adding rubber powder decreased the elastic modulus and plastic deformation of the mineral structure, enhancing the suitability of the mixture for flexible road pavements. However, when the replacement rate increased to a specific range, the rubber particles significantly interfered with the mineral material, worsening the stability of the structure. Therefore, it was preliminarily determined that the reasonable replacement rate of rubber powder was 30–50%. The ultrathin overlay epoxy‐rubber concrete exhibited excellent antistripping performance, and its porosity increased with the epoxy resin dosage. The optimum epoxy content was 6.5% at 4.17% porosity. Within the preliminarily determined replacement rate range of rubber particles, as the replacement rate increased, the flexibility, high‐temperature stability, antiskid performance, and shock and noise resistance of the mixture increased, but the compressive and flexural tensile strength values decreased. The integrated properties of the ultrathin overlay epoxy‐rubber concrete indicated that the best replacement rate of rubber powder was 45%. In this paper, the replacement rate range of the rubber powder was initially determined based on the gradation composition of the mixture, which avoids blind determination of the replacement rate. And the composition of the concrete was obtained comprehensively by the performance and function of the epoxy‐rubber concrete, which is reasonable and reliable. The epoxy‐rubber concrete design method proposed in this paper can promote the application the epoxy‐rubber concrete in pavement overlay engineering.

Interaction of aqueous phase fluoride and Amberlite IR400Cl resin: Evaluation of batch process

• Adsorption of fluoride using resin. • Central composite design based optimization. • Artificial neural network based prediction for removal percentage. • Thermodynamics, isotherm and kinetics study for fluoride removal process. Study was performed to evaluate fluoride removal from water using Amberlite IR400Cl resin. Single parameter study showed increment in removal initially and decline afterward under the influence of pH. Resin dose, contact time and temperature showed positive while fluoride concentration showed negative impact on removal. 76% removal was achieved at pH 7, 15 mg/l fluoride concentration, resin dose 20 g/l, 120-minute contact time and 25 °C temperature. Freundlich isotherm and Pseudo second order reaction model were best fitted to explain spontaneous and endothermic sorption. Interactive effects of operating parameters were investigated by CCD. Optimized CCD model predicted 73% removal at pH 7, 15 mg/l fluoride concentration, resin dose 20 g/l, 60-minute contact time and 25 °C temperature while actual removal was 70.0%. Operating parameters and respective removal were applied to construct ANN model. ANN predicted 72.5% removal for above mentioned conditions. Fluoride attachment on resin was also evident by FTIR.

La eliminación de metales tóxicos presentes en efluentes líquidos mediante resinas de cambio iónico. Parte XIV: Indium(III)/H+/Dowex-400

Se ha estudiado la eliminación del indio(III), de medios acuosos, mediante la resina de intercambio catiónico Dowex-400 midiendo el tanto por ciento de esta eliminación en función de la dosificación de resina y el pH de la disolución acuosa. La velocidad de agitación (300-1000 min−1) aplicada al sistema no tiene influencia sobre la eliminación del indio(III) de la disolución, estando el proceso de carga del metal en la resina asociado a un modelo de difusión en la disolución. La eliminación del metal de la disolución disminuye con la disminución del valor del pH. El proceso de intercambio es exotérmico (ΔH°= -90 kJ·mol−1), y siendo el modelo cinético dependiente de la temperatura: seudo-primer orden a 20 °C, segundo orden a 30 °C y seudo-segundo orden a 40 °C. La isoterma de Langmuir de tipo-2 es el modelo que mejor representa al proceso de carga del metal en la resina. El indio(III) cargado en la resina puede ser eluido mediante disoluciones acidas, regenerándose, al mismo tiempo, la resina.

Removal of Cadmium (II), Chromium (III), and Lead (II) Heavy Metal Ions from Water by Graft Copolymerization of Acrylonitrile onto Date Palm Fiber Using H2O2/Fe++ as an Initiator

The study is aimed at assessing how the date palm wood fibers (DPWF) can be used for the removal of heavy metals from water. The study involved examination of the radical polymerization and graft polymerization parameters such as reaction period, reaction time, monomer volume, amount of the catalyst, and concentration of initiator to obtain the maximum yield of graft polymerization. Fiber and copolymer were characterized using SEM and FT-IR spectroscopy to ensure the completion of polymerization. Hydroxylamine hydrochloride was used for treating the grafted copolymers for the preparation of polyamidoxime chelating resin, which was then examined for removing the heavy metal ions. Different resin dosages, contact time, and initial concentrations were used, and the batch technique experiment was utilized. The study also applied the Langmuir and Freundlich isotherm model, and Langmuir was found to be better. The absorption ability was found to be better for polyamidoxime resin for metal ions of cadmium (II), chromium (III), and lead (II).

The preparation of oxidative resin loaded with Fe3+ and their removal performance for 110 mAg in colloidal form

110 mAg, comes from pressurized water reactor units, has become one of the major radionuclides affecting the surrounding environment. The chemical species of 110 mAg are controlled by additives or impurities during operation process of nuclear power plant. Colloidal state (named Ag0) and ionic state are main chemical forms. It is difficult to remove Ag0 by commercial ion exchange resin because the colloidal particles have different sizes and low charge. The oxidative resin loaded with Fe3+ were prepared and used for removal of colloidal Ag from aqueous solution. The influence factors such as resin dosage, adsorption time and initial concentration of Ag0 were investigated through batch experiments. The adsorption efficiency of the oxidative resin towards Ag0 in aqueous solution could reach 92.5% under pH 7. The adsorption process corresponds to the Langmuir adsorption model and pseudo-second-order kinetic equation. XPS analysis clearly shows the presence of binding energy peaks of Fe2+ and Ag+, which indicates the adsorption mechanism towards Ag0 is based on the combined actions of redox and ion exchange.