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

2012 ◽  
Vol 06 ◽  
pp. 156-161 ◽  
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.

Chlorate Removal by Calcined Mg/Fe/Ce Layered Double Hydroxides

2015 ◽  
Vol 737 ◽  
pp. 537-540
Author(s):  
Yan Wei Guo ◽  
Hua Zhang ◽  
Zhi Liang Zhu
Keyword(s):  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Kinetics Of

A novel Mg/Fe/Ce layered double hydroxide (LDHs) and its calcined product (CLDH) were synthesized and CLDH was used as adsorbents for the removal of chlorate ions. Results showed that the initial solution pH was an important factor influencing the chlorate adsorption. The adsorption behavior of chlorate followed the Langmuir adsorption isotherm with a maximum adsorption capacity of 18.2 mg/g. The adsorption kinetics of chlorate on CLDH can be described by the pseudo-second-order kinetic model. It was concluded that the CLDH material is a potential adsorbent for the purification of polluted water with chlorate.

scholarly journals Ion Exchange of Benzoate in Ni-Al-Benzoate Layered Double Hydroxide by Amoxicillin

2019 ◽  
Vol 17 (1) ◽  
pp. 1043-1049
Author(s):  
Dian Windy Dwiasi ◽  
Mudasir Mudasir ◽  
Roto Roto
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Layered Double Hydroxide ◽  
Exchange Process ◽  
X Ray ◽  
Batch Technique ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Double Hydroxide ◽  
Benzoate Anion

AbstractThe Ni-Al-NO3 layered double hydroxide (LDH) compound has been intercalated with benzoate anion through an anion exchange process for amoxicillin drug adsorption. The purpose of this research is to synthesize Ni-Al-NO3, ion exchange with benzoate anion to form Ni-Al-Benzoate, and then applying it as an adsorbent of amoxicillin. The adsorption process was carried out using the batch technique. The materials synthesized in this study were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), X-ray ray diffraction (XRD), and Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA). The exchange of benzoate in Ni-Al-Benzoate LDH by amoxicillin was followed by UV-Vis spectrophotometry. The pH, LDH amount, and contact time are optimized. The adsorption of amoxicillin by Ni-Al-Benzoate is fit to the pseudo-second-order kinetics model, with an adsorption capacity of 40 mg/ g. The results showed that anion exchange was successfully carried out between benzoate anion and amoxicillin.

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

2020 ◽  
Vol 993 ◽  
pp. 1426-1431
Author(s):  
Bei Gang Li ◽  
Hai Yang Yin
Keyword(s):  
Ion Exchange ◽  
Adsorption Kinetics ◽  
Polymer Gel ◽  
Acid Dyes ◽  
Environmental Friendliness ◽  
Adsorption Effect ◽  
Ion Exchange Reaction ◽  
Pseudo Second Order ◽  
Acid Orange Ii ◽  
Stable Network

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.

scholarly journals Itaconic acid-modified layered double hydroxide as a ‎novel adsorbent for effective removal of Congo red from aqueous solutions

2021 ◽  
Author(s):  
Mohammad Dinari ◽  
Shirin Shabani
Keyword(s):  
Layered Double Hydroxide ◽  
Itaconic Acid ◽  
Congo Red ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Order Kinetic ◽  
Solution Ph ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract Herein, we report the synthesis of Cu-Ca-Al/NO3-based layered double hydroxide through co-precipitation methodology. The prepared layered double hydroxide was then modified with itaconic acid. The physicochemical properties of the prepared materials were studied using Fourier transform-infrared spectroscopy, scanning electron microscopy, X-ray diffraction analysis, thermogravimetric analysis, and nitrogen adsorption/desorption technique. The prepared materials were then applied as novel adsorbents for the removal of Congo red as a model of an anionic dye from aqueous media. To reach maximum adsorption, the effect of parameters including sample solution pH, adsorbent amount, contact time, and initial concentration of Congo red on the adsorption process was investigated. Kinetic studies were also conducted to study the mechanism of adsorption. In this regard, the kinetic models of pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion were studied. The results showed that the adsorption of Congo red onto Cu-Ca-Al-LDH and LDH-ITA adsorbents followed the pseudo-second-order kinetic model. To evaluate the equilibrium adsorption data, different isotherms including Langmuir, Freundlich, and Dubinin-Radushkevich were also applied. The data revealed that the Freundlich isotherm provided the best fit with the equilibrium data of both adsorbents. Maximum adsorption capacities of 81 and 84 mg g− 1 were obtained using Cu-Ca-Al-LDH and LDH-ITA adsorbents, respectively.

Intercalation of nucleotides into layered double hydroxides by ion-exchange reaction

2005 ◽  
Vol 28 (1-4) ◽  
pp. 137-145 ◽  
Author(s):  
Sumio Aisawa ◽  
Yuuki Ohnuma ◽  
Kimihiro Hirose ◽  
Satoshi Takahashi ◽  
Hidetoshi Hirahara ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Layered Double Hydroxides ◽  
Ion Exchange Reaction ◽  
Double Hydroxides

scholarly journals Removal of methylene blue from aqueous solution using Mg-Fe, Zn-Fe, Mn-Fe layered double hydroxide

2020 ◽  
Vol 81 (12) ◽  
pp. 2522-2532
Author(s):  
Zhongliang Shi ◽  
Yanmei Wang ◽  
Shuyu Sun ◽  
Cheng Zhang ◽  
Haibo Wang
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Langmuir Adsorption ◽  
Molar Ratios ◽  
Pseudo Second Order ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Double Hydroxides

Abstract Layered double hydroxides (LDH) with highly flexible and adjustable chemical composition and physical properties have attracted tremendous attention in recent years. A series of LDH with different M (Mg, Zn, Mn)-Fe molar ratios were synthesized by the double titration co-precipitation method. The effect of the factors, including M (Mg, Zn, Mn) : Fe molar ratio, pH, and M-Fe LDH dosage, on the ability of the prepared M-Fe LDH to remove cationic methylene blue (MB) dye from aqueous solution were investigated. Results indicated that the removal efficiency of MB (10 mg/L) was the best at the M (Mg, Zn, Mn): Fe molar ratio of 3:1 by using 2.0 g/L of M-Fe LDH at pH 6.0 under 298.15 K. Mg-Fe LDH had the highest removal performance (71.94 mg/g at 298.15 K) for MB compared to those of the Zn-Fe and Mn-Fe LDH. Zn-Fe LDH with the smallest activation energy resulted in the fastest adsorption rate of MB. The pseudo-second-order model and Langmuir adsorption isotherm were also successfully applied to fit the theory of M-Fe LDH for removal of MB.

Removal of borate by coprecipitation with Mg/Al layered double hydroxide

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540031 ◽  
Author(s):  
Masashi Kurashina ◽  
Tatsuki Inoue ◽  
Chihiro Tajima ◽  
Eiji Kanezaki
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Layered Double Hydroxide ◽  
Adsorption Isotherms ◽  
Langmuir Model ◽  
Saturation Limit ◽  
Ion Exchange Reaction ◽  
Double Hydroxide ◽  
Boron Adsorption ◽  
Maximum Removal

Borate has been used for various industrial products and excessive dose of boron is harmful to humans. We investigated the removal of borate by direct coprecipitation with Mg / Al layered double hydroxide. In this study, the maximum removal of boron was 90% when Mg 30 mmol and Al 15 mmol at pH = 10 were used for 498 mg/l as B. The boron adsorption isotherms could be fitted to Langmuir model. The calculated constant Ws, saturation limit of boron adsorption, is 25 ± 2 mg/g and it is larger than that of ion exchange reaction (Ws = 15±1 mg/g ).

Pathways of phosphate uptake from aqueous solution by ZnAl layered double hydroxides

2013 ◽  
Vol 67 (8) ◽  
pp. 1757-1763 ◽  
Author(s):  
X. Cheng ◽  
Y. Wang ◽  
Z. Sun ◽  
D. Sun ◽  
A. Wang
Keyword(s):  
Ion Exchange ◽  
Layered Double Hydroxides ◽  
Surface Adsorption ◽  
Chloride Ion ◽  
Bulk Solution ◽  
Entire Study ◽  
Pseudo Second Order ◽  
Interlayer Anion ◽  
Acidic Conditions ◽  
Double Hydroxides

ZnAl layered double hydroxides (LDHs) were prepared by urea hydrolysis-based coprecipitation for removing phosphate from aqueous solutions. The chemical formula of the product was determined as Zn5.54Al3.02(OH)8.73(CO3)0.57Cl5.66·7.84H2O. Chloride ion was the major interlayer anion of the ZnAl LDHs. Adsorption of phosphate onto the ZnAl sorbent over the entire study period was not in close agreement with pseudo-first-order or pseudo-second-order models. The adsorption can be divided into two steps. A fast adsorption was observed during the first 10 h with a marked increase in the concentration of Cl− in the bulk solution. This indicated that the adsorption of phosphate was largely attributed to the ion exchange between phosphate and the interlayer Cl−. A second fast adsorption of phosphate occurred after 10 h. During this period, the pH increased slowly, whereas the Cl− concentration was stable. The uptake of phosphate was likely attributed to OH−–H2PO4−/HPO42− ion exchange as well as surface adsorption/complexation. Acidic conditions favored adsorption of phosphate by ZnAl LDHs, which is consistent with the pH increases during the adsorption. Coexisting anions, e.g., SO42− and CO32−, are competitive ions for the adsorption of phosphate. The results verify the contribution of ion exchange and surface adsorption/complexation in the removal of phosphate by ZnAl LDHs.

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

2019 ◽  
Vol 79 (11) ◽  
pp. 2116-2125 ◽  
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.

Anion exchange behavior of MIIAl layered double hydroxides: a molecular dynamics and DFT study

2020 ◽  
Vol 22 (35) ◽  
pp. 19758-19768 ◽  
Author(s):  
Xiao-Jie Zhao ◽  
Yu-Quan Zhu ◽  
Si-Min Xu ◽  
Hui-Min Liu ◽  
Pan Yin ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Layered Double Hydroxides ◽  
Dft Study ◽  
Sewage Disposal ◽  
Supramolecular Materials ◽  
Ion Exchange Reaction ◽  
Double Hydroxides

The ion exchange reaction has been extensively used in the field of synthesis of functionalized supramolecular materials such as layered double hydroxides (LDHs), ion-embedded batteries, sewage disposal and so on.

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