Preparation of Alginate Polymer Gel Pellets and its Adsorption on Acid Dyes

A novel calcium alginate (SA/Ca) gel pellet adsorbent was prepared by ion exchange reaction and polymerization between sodium alginate (SA) and Ca2+ in the solution, and characterized by SEM, EDS, FTIR and XRD. Taking acid orange II ( AO II) dye as the adsorption object, the influence of some important conditions about preparation and adsorption on SA/Ca properties was discussed in detail. The adsorption kinetics were studied. The results show that SA/Ca adsorbent has good adsorption effect on AO II dye under the conditions of the mass concentration ratio 2 : 5 of SA and CaCl2 solutions and reaction time of 2h at 25°C. When the adsorbent dosage is 4g/L and initial dye concentration of natural pH is 1000 mg/L, the adsorption equilibrium can basically reach in 180 min at 25°C with the adsorption capacity of 225mg/g and more than 90% of removal efficiency. The adsorption kinetics fully fit pseudo-second order model. The characterization results indicate that the SA powder is composed of various irregular particles, while dry SA/Ca solid are all pellets with diameter of about 1mm. The surface of inhomogeneous spheres is stacked with obstacles, and folds and ravines coexist. Ca2+ and most Na+ in SA molecule carried out ion exchange and formed a stable network-structure polymer SA/Ca gel pellets, which can effectively remove acid dyes from wastewater, and are easy to be separated after adsorption. As a biopolymer adsorbent with simple preparation method, environmental friendliness and non-toxic side effects, SA/Ca has good development potential and application prospects.

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ELUTION BEHAVIOR OF PHOSPHATE CONTAINED IN Mg/Fe AND Zn/Fe LAYERED DOUBLE HYDROXIDES

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194512003108 ◽

2012 ◽

Vol 06 ◽

pp. 156-161 ◽

Cited By ~ 1

Author(s):

Masashi Kurashina ◽

Tomohiro Amatsu ◽

Takaaki Ochi ◽

Nozomi Ohigashi ◽

Eiji Kanezaki

Keyword(s):

Ion Exchange ◽

Concentrate Solution ◽

Sulfate Solution ◽

Carbonate Solution ◽

Solution Ph ◽

Ion Exchange Reaction ◽

Pseudo Second Order ◽

Elution Behavior ◽

Double Hydroxide ◽

Double Hydroxides

Layered double hydroxide (LDH) is a layered hydroxide and exchangeable anion is intercalated in its interlayer. Application of the LDH as a controlled-release material of interlayer anions has become of interest, thus it is important to clarify the elution behavior of interlayer anions. We synthesized hydrogenphosphate-intercalated Mg / Fe and Zn / Fe LDH and elution of phosphate from these LDH were tested in deionized water, sodium chloride solution, sodium sulfate solution, and sodium carbonate solution. For Mg / Fe LDH, the amount of eluted phosphate increased with time and reached to maximum that increased as higher concentrate solution was used. The elution of phosphate from Mg / Fe LDH could be described by the pseudo second-order equation. This elution behavior was explained as ion-exchange reaction of phosphate with sulfate or carbonate in tested solution by means of kinetic simulation using Runge-Kutta method. In the eluted solution, metal ions contained in the LDH were detected and its amount depended on pH of the tested solution, that is, amounts of eluted Mg and Zn ions were small at higher pH (ca. 10) for Mg / Fe and Zn / Fe LDH respectively, but large amount of Zn ion was detected when 2.03 mol·l-1 carbonate solution (pH = 13) was used. Thus elution of phosphate was caused by two main reactions: ion exchange and decomposition of the LDH.

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Concentration of Miglitol on Adsorption Effect of Equilibrium and Kinetics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.899 ◽

2011 ◽

Vol 236-238 ◽

pp. 899-902

Author(s):

Jie Bing Zhang ◽

Xiao Li Zhang ◽

Hong Ya Li ◽

Bin Xia Zhao ◽

Zhu Xiong

Keyword(s):

Ion Exchange ◽

Exchange Process ◽

Order Equation ◽

Second Order ◽

Adsorptive Capacity ◽

Adsorption Effect ◽

Ion Exchange Process ◽

Equilibrium And Kinetics ◽

Pseudo Second Order ◽

Linear Fit

Concentrations of miglitol on the adsorptive capacity effect of resin were investigated.The pseudo first and second order equations were used to describe the kinetic process of ion exchange. The results showed that adsorption of miglitol onto resin is fast and can reach approximate equilibrium after 2.5h. Langmuir model is suitable to describe the equilibrium adsorption.By linear fit of the pseudo first and second order equation and comparing the R2value of correlation coefficient, it finds that the R2value of the pseudo second order equation is bigger, and concludes that the ion exchange process is described by the pseudo second order equation.

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Application of fly ash-based geopolymer for removal of cesium, strontium and arsenate from aqueous solutions: kinetic, equilibrium and mechanism analysis

Water Science & Technology ◽

10.2166/wst.2019.209 ◽

2019 ◽

Vol 79 (11) ◽

pp. 2116-2125 ◽

Cited By ~ 1

Author(s):

Quanzhi Tian ◽

Keiko Sasaki

Keyword(s):

Fly Ash ◽

Ion Exchange ◽

Decisive Role ◽

Mechanism Analysis ◽

Free Energies ◽

Freundlich Model ◽

Ion Exchange Reaction ◽

Pseudo Second Order ◽

Kinetic Equilibrium ◽

Inner Sphere Complexes

Abstract Geopolymerization is a developing reaction process for the utilization of solid wastes. In the present study, fly ash-based geopolymer and its derivative (Fe(II)-modified geopolymer) were synthesized and characterized using XRD, SEM, FTIR, BET, UV-Vis DRS as well as TG-DTA, and adopted as adsorbents for removal of Cs+ and Sr2+, and from solutions. Each sorption kinetic was well fitted to the pseudo-second-order model. The sorption of Cs+ and Sr2+ onto original geopolymer were better fitted to the Langmuir model. However, the Freundlich model is more befitting for sorption of onto Fe(II)-modified geopolymer. The free energies calculated from the D-R isotherm indicated that the sorption for Cs+ and Sr2+ were dominantly ion exchanges. Ring size plays a decisive role in ion exchanges for both Cs+ and Sr2+. Furthermore, the arrangement of SiO4 and AlO4 tetrahedrons has significant impacts on the ion exchange of Sr2+. XPS results indicated that a part of Fe2+ in Fe (II)-modified geopolymer had been oxidized to Fe3+ after sorption. Precipitation of FeAsO4 could partially contribute to the arsenate removal from solution. sorption has also occurred through the formation of inner-sphere complexes via ion exchange reaction, which could be predominantly attached by bidentate linkages.

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Adsorptive removal of gallic acid from aqueous solution onto magnetic ion exchange resin

Water Science & Technology ◽

10.2166/wst.2020.236 ◽

2020 ◽

Vol 81 (7) ◽

pp. 1479-1493

Author(s):

Lei Ding ◽

Changjin Guo ◽

Yunhua Zhu ◽

Jiangya Ma ◽

Yanli Kong ◽

...

Keyword(s):

Ion Exchange ◽

Gallic Acid ◽

Adsorption Kinetics ◽

Ion Exchange Resin ◽

Batch Tests ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Chloride Sulfate ◽

Water And Wastewater ◽

Magnetic Ion

Abstract Finding an appropriate adsorbent with high adsorption capacity, quick adsorption kinetics and easy regeneration was crucial to the removal of gallic acid (GA) from water and wastewater. Our aims were to investigate whether a magnetic ion exchange (MIEX) resin had the three merits mentioned above, and investigate the feasibility of GA adsorption on MIEX resin, and the adsorption kinetics, equilibrium, thermodynamics, regeneration and mechanism using batch tests. The uptake of GA increased with increasing GA concentration. The GA concentration influenced the time needed to reach equilibrium, but the adsorption could be completed within 120 min. Elevating temperature facilitated the GA removal. The removal percent remained above 95.0% at pH 5.0–11.0. Carbonate and bicarbonate promoted the GA removal; conversely chloride, sulfate and nitrate restrained the GA removal significantly. The adsorption kinetics could be fitted well with the pseudo second-order model, and the film diffusion governed the whole adsorption rate. The equilibrium data followed the Redlich–Peterson isotherm model. The adsorption was a spontaneous, endothermic and entropy driven process. The ion exchange dominated the removal mechanism. The spent MIEX resin was well regenerated by sodium chloride. Therefore, MIEX resin is a potential adsorbent for removing GA quickly and efficiently from water and wastewater.

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Lignocellulose-Based Superabsorbent Polymer Gel Crosslinked with Magnesium Aluminum Silicate for Highly Removal of Zn (II) from Aqueous Solution

Polymers ◽

10.3390/polym13234161 ◽

2021 ◽

Vol 13 (23) ◽

pp. 4161

Author(s):

Yuhong An ◽

Wanqi Zhang ◽

Hui Liu ◽

Yuan Zhong ◽

Zichu Hu ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Kinetics ◽

Nitrogen Adsorption ◽

Aluminum Silicate ◽

Maximum Adsorption Capacity ◽

Polymer Gel ◽

Adsorption Effect ◽

Magnesium Aluminum Silicate ◽

Initial Adsorption ◽

Adsorption Kinetics And Isotherm

Lignocellulose (LCE) was ultrasonically treated and intercalated into magnesium aluminum silicate (MOT) clay to prepare a nano-lignocellulose magnesium aluminum silicate polymer gel (nano-LCE-MOT) for the removal of Zn (II) from aqueous solution. The product was characterised using nitrogen adsorption/desorption isotherm measurements, Fourier-transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The conditions for the adsorption of Zn (II) on nano-LCE-MOT were screened, and adsorption kinetics and isotherm model analysis were carried out to explore the adsorption mechanism and achieve the optimal adsorption of Zn (II). Optimal adsorption was achieved at an initial Zn (II) concentration of 800 mg/L at 60 °C in 160 min at a pH of 4.52. The adsorption kinetics were explored using a pseudo-second-order model, with the isotherm adsorption equilibrium found to conform to the Langmuir model. The maximum adsorption capacity of the nano-LCE-MOT polymer gel toward Zn (II) is 513.48 mg/g. The materials with adsorbed Zn (II) were desorbed using different media, with HCl found to be the most ideal medium to desorb Zn (II). The optimal desorption of Zn (II) was achieved in 0.08 mol/L HCl solution at 65 °C in 60 min. Under these conditions, Zn (II) was almost completely desorbed from the adsorbents, with the adsorption effect after cycling being slightly different from that of the initial adsorption.

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Photoassisted Production of O2-• and H2 in Aqueous Medium Stimulated by Polythiophene in ZSM-5 Zeolite Channels

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19990149 ◽

1999 ◽

Vol 64 (1) ◽

pp. 149-156 ◽

Cited By ~ 7

Author(s):

Gabriel Čík ◽

František Šeršeň ◽

Alena Bumbálová

Keyword(s):

Reactive Oxygen Species ◽

Ion Exchange ◽

Visible Light ◽

Aqueous Medium ◽

Exchange Reaction ◽

Epr Spectroscopy ◽

Reactive Oxygen ◽

Oxygen Species ◽

Water Reduction ◽

Ion Exchange Reaction

The formation of reactive oxygen species due to irradiation by a visible light of the polythiophene deposited in ZSM-5 zeolite channels in aqueous medium has been studied. Polymerization of thiophene was carried out in zeolite channels after the ion-exchange reaction of Na+ for Fe3+. By means of EPR spectroscopy, the temporarily generated 1O2 in irradiated aqueous medium was proved. The formation of O2-• was confirmed by the reduction of Fe3+-cytochrome c. Irradiation led to the water reduction to hydrogen.

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Insight into the enhanced photocatalytic properties of AgBr/Ag4P2O7 composites synthesized via in situ ion exchange reaction

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2020.104889 ◽

2021 ◽

Vol 9 (1) ◽

pp. 104889

Author(s):

Wyllamanney da S. Pereira ◽

Fabrício B. Destro ◽

Cipriano B. Gozzo ◽

Edson R. Leite ◽

Júlio C. Sczancoski

Keyword(s):

Ion Exchange ◽

Exchange Reaction ◽

Photocatalytic Properties ◽

Ion Exchange Reaction ◽

Insight Into

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An Amberlite IRA-400 Cl− ion-exchange resin modified with Prosopis juliflora seeds as an efficient Pb2+ adsorbent: adsorption, kinetics, thermodynamics, and computational modeling studies by density functional theory

RSC Advances ◽

10.1039/d0ra10128a ◽

2021 ◽

Vol 11 (8) ◽

pp. 4478-4488

Author(s):

Sivaprakasam Anbazhagan ◽

Venugopal Thiruvengadam ◽

Anandhakumar Sukeri

Keyword(s):

Density Functional Theory ◽

Ion Exchange ◽

Computational Modeling ◽

Removal Efficiency ◽

Adsorption Kinetics ◽

Density Functional ◽

Exchange Resin ◽

Ion Exchange Resin ◽

Prosopis Juliflora ◽

Functional Theory

We have demonstrated a high Pb2+ removal efficiency (73.45%) from wastewater using a Prosopis juliflora-seed-modified Amberlite IRA-400 Cl− ion-exchange resin (SMA resin).

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Removal of Mg from spring water using natural clinoptilolite

Clay Minerals ◽

10.1180/claymin.2012.047.1.81 ◽

2012 ◽

Vol 47 (1) ◽

pp. 81-92 ◽

Cited By ~ 1

Author(s):

S. Tomić ◽

N. Rajić ◽

J. Hrenović ◽

D. Povrenović

Keyword(s):

Ion Exchange ◽

Kinetic Studies ◽

Spring Water ◽

Zeolite A ◽

Zeolitic Tuff ◽

Rate Limiting Step ◽

Intra Particle Diffusion ◽

Pseudo Second Order ◽

Natural Clinoptilolite ◽

Rate Limiting

AbstractNatural zeolitic tuff from Brus (Serbia) consisting mostly of clinoptilolite (about 90%) has been investigated for the reduction of the Mg concentration in spring water. The sorption capacity of the zeolite is relatively low (about 2.5 mg Mg g-1for the initial concentration of 100 mg Mg dm-3). The zeolitic tuff removes Mg from water solutions by ion exchange, which has been demonstrated by energy dispersive X-ray analysis (EDS). The extent of ion exchange was influenced by the pH and the initial Mg concentration. Kinetic studies revealed that Lagergen's pseudo-second order model was followed. Intra-particle diffusion of Mg2+influenced the ion exchange, but it is not the rate-limiting step. Rather than having to dispose of the Mg-loaded (waste) zeolite, a possible application was tested. Addition to a wastewater with a low concentration of Mg showed that it could successfully make up for the lack of Mg micronutrient and, accordingly, enabled the growth of phosphate-accumulating bacteriaA. Junii, increasing the amount of phosphate removed from the wastewater.

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