scholarly journals Removal of Ammonium Ions from Aqueous Solutions Using Weathered Halloysite

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4359
Author(s):  
Jacek Leszczyński
Keyword(s):  
Ion Exchange ◽  
Natural Waters ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Order Kinetic ◽  
Ammonium Ions ◽  
Ion Exchange Capacity ◽  
Ion Removal ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This study investigated the use of weathered halloysite as an ion exchange material for ammonium removal from water. The study was conducted under static and dynamic conditions. The influence of such parameters as the preliminary concentration of ammonium ions, dose of halloysite, and pH was examined in periodic studies. The ion exchange capacity of weathered halloysite under various regeneration conditions such as concentration, excess of regeneration solution and the pH at which the regeneration was performed was also determined. The effect of flow velocity, initial NH4+-ions concentration was studied in column tests and the weathered halloysite’s ion -exchange capacity was also determined. The best results of ammonium ion removal were obtained at pH 6. The equilibrium isotherms were described using the Langmuir and Freundlich models. The results of periodic studies show a good fit for the data of both models, with Langmuir isotherms reflecting the removal of ammonium ions better. A good match for the data (R2 > 0.99) was provided by a pseudo second-order kinetic model. The obtained results indicate that a properly prepared halloysite can be a useful mineral for the removal of dangerous substances, such as ammonium ions, present in natural waters.

An experimental study of sorption properties of natural zeolite-containing rocks and their ability for purification of aquatic solutions contaminated with Ni and Zn

2020 ◽  
Author(s):  
Liudmila Kolmykova ◽  
Valentina Nikashina ◽  
Elena Korobova
Keyword(s):  
Ion Exchange ◽  
Natural Zeolite ◽  
Natural Waters ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Geochemical Barrier ◽  
Solid Domestic Waste ◽  
Ion Exchange Capacity ◽  
Model Solutions

<p>Sorption parameters of natural zeolite-containing tripolite from the Khotynetsky deposit (Russia, Oryol region) were studied in a series of experiments to evaluate possibility of its usage as a geochemical barrier for teсhnogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> contaminating soils and ground waters. <br>Firstly, the tripolite total ion-exchange capacity was established by its saturation with ammonium ion and evaluating its content in the initial and ammonium forms with the help of X-ray fluorescence method. Secondly, the kinetic characteristics, namely the time necessary to reach the equilibrium state of the rock-water system containing Ni<sup>2+</sup> and Zn<sup>2+</sup> ions were determined in batch experiments using the method of "limited volume". The latter experiment was conducted using 0.5 g tripolite with 250 ml model solutions simulating natural river water (0.003 н CaCl<sub>2</sub>) and filtration water from solid domestic waste landfill (0.06 н CaCl<sub>2</sub>) and containing  2 mg/l Ni<sup>2+</sup> and  Zn<sup>2+</sup>. The time of contact between the sorbent and the model solution varied from 2 hours to 21 days. Thirdly, basing on reference data on the real content of heavy metals in the filtrates of various landfills, an experiment on determination of the tripolite equilibrium exchange (and adsorption) capacity was carried out. The prepared model solutions in the latter experiment contained 2, 5, 7 and 10 mg/l of Ni<sup>2+</sup> and Zn<sup>2+</sup>. The amount of Ni<sup>2+</sup> and Zn<sup>2+  </sup>in solutions was determined by the ICP-AES.<br>According to the obtained results, the total ion-exchange capacity of the natural tripolite equaled to 1.18 mg-eq/g. The sorption isotherms based on kinetic experiments showed that equilibrium in the studied rock-solution system took place after 200 to 500 hours of interaction. Despite natural scattering of experimental points in the range of the used Ni<sup>2+</sup> and Zn<sup>2+</sup> concentrations in the third experiment which lasted 21 days, the sorption of the studied ions by the natural tripolite can be approximated by a linear isotherm, zinc being sorbed much better than nickel. The average values of distribution coefficients (Kd) obtained for 0.003 n CaCl<sub>2</sub> aquatic solution equaled to 2.7*103 ml/g for Ni<sup>2+</sup> and 6.7*103 ml/g for Zn<sup>2+</sup>.<br>Therefore, natural tripolite of the Khotinetsky deposit may well be used as a natural geochemical barrier for extraction of technogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> from natural waters draining landfills and contaminated by these ions.</p><p> </p>

Clinoptilolite: a possible support material for nitrifying biofilms for effective control of ammonium effluent quality?

2005 ◽  
Vol 51 (11) ◽  
pp. 63-70 ◽  
Author(s):  
H. Inan ◽  
B. Beler Baykal
Keyword(s):  
Ion Exchange ◽  
High Capacity ◽  
Exchange Capacity ◽  
Quality Data ◽  
Ammonium Ion ◽  
Effective Control ◽  
Support Material ◽  
Ion Exchange Capacity ◽  
Effluent Quality ◽  
Peak Loads

Ammonium selective natural zeolite clinoptilolite is suggested as a possible support material for nitrifying biofilms to help improve effluent ammonium quality through its high capacity of ammonium removal in the process of ion exchange. This will especially be helpful in cases where the biofilter receives peak or variable loads routinely or occasionally. At the time of peak loads or shocks of ammonium, ion exchange capacity will provide a buffer for the effluent ammonium quality. Data to support this suggestion is presented.

scholarly journals Characterization of Functionalized Polyurethane Foam for Lead Ion Removal from Water

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Subhashini Gunashekar ◽  
Nidal Abu-Zahra
Keyword(s):  
Ion Exchange ◽  
Polyurethane Foam ◽  
Inductively Coupled Plasma ◽  
Exchange Capacity ◽  
Polyurethane Foams ◽  
Molar Ratio ◽  
Lead Ion ◽  
Polypropylene Glycol ◽  
Ion Exchange Capacity ◽  
Ion Removal

Polyurethane foams functionalized with sulfonic acid groups are used in this study to exchange lead (Pb2+) ions from aqueous solutions. Toluene-2, 4-diisocyanate, 2,6-diisocyanate (TDI) was reacted with Polypropylene glycol 1200 (PPG) in 2 : 1 molar ratio to form a linear prepolymer. The linear prepolymer was further polymerized using N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES), which acts both as a chain extender and an ion-exchanger for Pb2+ions. The functionalized polyurethane foam was characterized by Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The Pb2+ion exchange capacity was determined using an Inductively Coupled Plasma Mass Spectrometer (ICP-MS). The maximum Pb2+ion exchange capacity of the foam was found to be 51 ppb/g from a 100 ppb Pb2+solution over a period of two hours. In addition, pH analysis was carried out on the foam composition with the best Pb2+ion removal capacity. The pH results based on two-hour exposures showed that the functionalized polyurethane foam performed better at lower pH levels.

Study of the effect of an acid treatment of a natural Moroccan bentonite on its physicochemical and adsorption properties

2016 ◽  
Vol 75 (5) ◽  
pp. 1098-1117 ◽  
Author(s):  
Ikram Daou ◽  
Omar Zegaoui ◽  
Ali Amachrouq
Keyword(s):  
Acid Treatment ◽  
Physicochemical Characterization ◽  
Weight Ratio ◽  
Exchange Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
The Impact

In this study, a natural bentonite taken from a deposit in the Northeast of Morocco has been purified (PB) and treated with various HCl molarities (xHPB) in order to obtain an HCl/Bentonite weight ratio equal to 0.2, 0.4 and 0.6. The obtained physicochemical characterization results indicated that the PB sample is composed mainly of the montmorillonite phase. The impact of acid treatment was investigated by identifying changes in the chemical composition, cation exchange capacity, infrared absorption bands, crystalline structure, morphology of the particles and specific surface area. The adsorption behavior of methylene blue (MB) and methyl orange (MO) in aqueous solution onto PB and xHPB samples was investigated by varying the initial concentration of dyes, the contact time and the temperature. The obtained results showed that the experimental data best fit the Langmuir model and the pseudo-second-order kinetic model. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies carried out after MB and MO adsorption onto PB samples indicated that MB cations were intercalated, in the form of monomers and dimers, with a large amount of monomers, slightly tilted against the plane of the clay surface. While MO molecules adsorb, with a near perpendicular alignment, with their SO3− group and O− atoms facing the mineral surface plane.

Adsorption of Pb(II) on raw and organically modified Jordanian bentonite

Clay Minerals ◽  
2015 ◽  
Vol 50 (4) ◽  
pp. 485-496 ◽  
Author(s):  
I. Hamadneh ◽  
R. Abu-Zurayk ◽  
B. Abu-Irmaileh ◽  
A. Bozeya ◽  
A. H. Al-Dujaili
Keyword(s):  
Exchange Capacity ◽  
Second Order ◽  
Area Measurement ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Modified Bentonite ◽  
X Ray ◽  
Order Kinetic Model ◽  
Pseudo Second Order

AbstractA comparative study using bentonite (BT), hexadecyltrimethylammonium-modified bentonite (BT-HDTMA) and phenyl fatty hydroxamic acid-modified bentonite (BT-PFHA) as adsorbents for the removal of Pb(II) has been proposed. These adsorbents were characterized by X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy and surface area measurement. Cation exchange capacity was also determined in this study. The adsorbent capabilities for Pb(II) from aqueous solution were investigated, and the optimal experimental conditions including adsorption time, adsorbent dosage, the initial concentration of Pb(II), pH and temperature that might influence the adsorption performance were also investigated. The experimental equilibrium adsorption data were tested by four widely used two-parameter equations, the Langmuir, Freundlich, Dubinin- Radushkevich (D-R) and Temkin isotherms. The monolayer adsorption capacities of BT, BT-HDTMA and BT-PFHA for Pb(II) were 149.3, 227.3 and 256.4 mg/g, respectively. The experimental kinetic data were analysed by pseudo-first order, pseudo-second order and intraparticle diffusion kinetics models. The experimental data fitted very well with the pseudo-second order kinetic model. Determination of the thermodynamic parameters, ΔG, ΔH and ΔS showed the adsorption to be feasible, spontaneous and exothermic.

scholarly journals Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Thu Dieu Le ◽  
Luyen Thi Tran ◽  
Hue Thi Minh Dang ◽  
Thi Thu Huyen Tran ◽  
Hoang Vinh Tran
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Metal Treatment ◽  
Pseudo Second Order ◽  
Adsorption Of Co2

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg−1·min−1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (qmax) reaching 373.37 mg·g−1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

scholarly journals Synthesis of cross-linking chitosan-PVA composite hydrogel and adsorption of Cu(II) ions

2020 ◽  
Vol 81 (5) ◽  
pp. 1063-1070 ◽  
Author(s):  
Qingping Song ◽  
Jiangang Gao ◽  
Ying Lin ◽  
Ze Zhang ◽  
Yixin Xiang
Keyword(s):  
Chemical Properties ◽  
Acid Resistance ◽  
Strong Acid ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Ion Removal ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ph Range ◽  
Physical And Chemical

Abstract A cross-linked chitosan-PVA spherical hydrogel (CSH) was synthesized and its structure was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The physical and chemical properties of CSH, such as acid resistance and swelling, were determined. Finally, Cu(II) ion removal by the CSH was investigated, and the effects of experimental parameters, including pH, adsorption time, and regeneration performance were examined. Results revealed that CSH has outstanding stability in strong acid solution, thus extending the useful pH range as an adsorbent material. The maximum capacity of CSH for Cu(II) was obtained to be 62.1 mg/g at 25 °C for 24 h. The adsorption process was best described by a pseudo-second-order kinetic model, while isotherm modeling revealed that the Langmuir equation better described the adsorption of Cu(II) on CSH. Moreover, the loaded CSH can be easily regenerated by the HCl-washing method and reused repeatedly for Cu(II) adsorption for up to five cycles.

The Use of Zeolite for Ammonium Uptake

1992 ◽  
Vol 25 (1) ◽  
pp. 139-145 ◽  
Author(s):  
A. Haralambous ◽  
E. Maliou ◽  
M. Malamis
Keyword(s):  
Ion Exchange ◽  
Separation Factor ◽  
Kinetic Studies ◽  
Exchange Capacity ◽  
Ammonium Uptake ◽  
Exchange Equilibrium ◽  
Natural Zeolites ◽  
Ammonium Ions ◽  
Ion Exchange Capacity ◽  
Ammonium Removal

In most countries today the removal of ammonium ions from effluents has become almost a necessity. In this work, studies are presented which demonstrate that natural zeolites and namely clinoptilolite may be effectively used for the removal of ammonium ions. The kinetic studies performed, the isotherms of the ion exchange equilibrium and the calculated separation factor show that clinoptilolite is very selective towards ammonium ions. Also, an attempt is made to study the effect of clinoptilolite pretreatment on its ion exchange capacity for the removal of ammonium ions. Experimental results show that repeated pre-treatments sufficiently improve the zeolite's properties, and the structure of clinoptilolite remains unchanged during the loading and the regeneration cycles. It is concluded that the use of zeolite is an attractive and promising method for ammonium removal.

scholarly journals Assessment of cadmium ion adsorption capacity in water by biochar produced from pyrolysis of cow dung

2021 ◽  
Vol 9 (3) ◽  
pp. 203-210
Keyword(s):  
Adsorption Process ◽  
Exchange Capacity ◽  
Cow Dung ◽  
Order Kinetic ◽  
Adsorption Models ◽  
Fixed Concentration ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Varying Length ◽  
Equilibrium Analyses

Biochar production from cattle waste and the potential of biochar as an adsorbent for treating pollution are among the hot research topics in recent years. The goal of this study is to evaluate the ability to adsorption Cd2+ from water of biochar produced from cow dung at varying pyrolysis temperatures (300, 450, and 500oC).The study determineda number of surface-level chemical characteristics of the biocharsamples such astotal organic carbon (TOC), pH, pHpzc, functional group H+ , OH- , and cation exchange capacity (CEC). Biochar samples were subjected to two different experiments: the first submerged the biochar in Cd2+ solutions at different concentration (0- 132 mgCd2+ .L -1 ) for a fixed 12 h and the second submerged the biochar in Cd2+ solutions at a fixed concentration of 66 mgCd2+ .L -1 for a varying length of time. Adsorption kinetics and equilibrium analyses were conducted on the samples at the end of the experiments. The Cd2+ adsorption process of these biochar forms fit Langmuir and Freundlich adsorption models as well as a pseudo-second-order kinetic model. The study concluded that biochar produced from pyrolysis of cow dung could be employed as an adsorbentfor the removal of Cd2+ from water.

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