scholarly journals Kinetic Studies on the Removal of Some Lanthanide Ions from Aqueous Solutions Using Amidoxime-Hydroxamic Acid Polymer

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Fadi Alakhras
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Hydroxamic Acid ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Intraparticle Diffusion ◽  
Lanthanide Ions ◽  
Contact Period ◽  
Order Kinetic ◽  
Order Kinetic Model

Lanthanide metal ions make distinctive and essential contributions to recent global proficiency. Extraction and reuse of these ions is of immense significance especially when the supply is restricted. In light of sorption technology, poly(amidoxime-hydroxamic) acid sorbents are synthesized and utilized for the removal of various lanthanide ions (La3+, Nd3+, Sm3+, Gd3+, and Tb3+) from aqueous solutions. The sorption speed of trivalent lanthanides (Ln3+) depending on the contact period is studied by a batch equilibrium method. The results reveal fast rates of metal ion uptake with highest percentage being achieved after 15–30 min. The interaction of poly(amidoxime-hydroxamic) acid sorbent with Ln3+ ions follows the pseudo-second-order kinetic model with a correlation coefficient R2 extremely high and close to unity. Intraparticle diffusion data provide three linear plots indicating that the sorption process is affected by two or more steps, and the intraparticle diffusion rate constants are raised among reduction of ionic radius of the studied lanthanides.

Sorption of Pb(II) by poly(hydroxamic acid) grafted oil palm empty fruit bunch

2011 ◽  
Vol 63 (8) ◽  
pp. 1788-1793
Author(s):  
M. J. Haron ◽  
M. Tiansin ◽  
N. A. Ibrahim ◽  
A. Kassim ◽  
W. M. Z. Wan Yunus ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Free Energy ◽  
Oil Palm ◽  
Hydroxamic Acid ◽  
Sorption Process ◽  
Enthalpy Change ◽  
Langmuir Model ◽  
Order Kinetic ◽  
Empty Fruit Bunch ◽  
Order Kinetic Model

This paper describes the sorption of Pb(II) from aqueous solution. Oil palm empty fruit bunch (OPEFB) fiber was first grafted with poly(methylacrylate) and then treated with hydroxylammonium chloride in alkaline medium to produce hydroxamic acid (PHA) grafted OPEFB. Sorption of Pb(II) by PHA-OPEFB was maximum at pH 5. The sorption followed the Langmuir model with maximum capacityof 125.0 mg g−1 at 25°C. The sorption process was exothermic, as shown by the negative value of enthalpy change, ΔH0. The free energy change (ΔG0) for the sorption was negative, showing that the sorption process was spontaneous. A kinetic study showed that the Pb(II) sorption followed a second order kinetic model.

scholarly journals Fast Removal of Co2+ and Ni2+ from Aqueous Solution Using Partial Carbonized Nanoporous Resin

2015 ◽  
Vol 10 (3) ◽  
pp. 729-737
Author(s):  
Imed Ghiloufi
Keyword(s):  
Electron Microscopy ◽  
Metal Ion ◽  
Sol Gel ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Effective Parameters ◽  
Order Kinetic Model ◽  
Adsorption Of Co2 ◽  
Organic Xerogel

Partial carbonized nanoporous resin (PCNR-150), based on organic xerogel compounds, was prepared at 150 ºC by sol–gel method from pyrogallol and formaldehyde mixtures in water using perchloric acid as catalyst. The PCNR-150 was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transformed infrared spectroscopy (FTIR) and nitrogen porosimetry. The metal uptake characteristics were explored using well-established and effective parameters including pH, contact time, initial metal ion concentration, and temperature. Optimum adsorptions of Co2+ and Ni2+, using PCNR-150 as adsorbent, were observed at pH 5 and 7, respectively. Langmuir model gave a better fit than the other models, and kinetic studies revealed that the adsorption is fast and its data are well fitted by the pseudo-second-order kinetic model and thermodynamic properties, i.e., ΔGo, ΔHo, and ΔSo, showed that adsorption of Co2+ and Ni2+ onto PCNR-150 was endothermic, spontaneous and feasible in the temperature range of 300–328 K.

scholarly journals Polymeric Substitution of Triazole Moieties in Cellulosic Schiff Base for Heavy Metal Complexation Studies

2021 ◽  
Author(s):  
R MAHALAKSHMI ◽  
SARAVANAN R ◽  
P SELVAKUMAR ◽  
M S KARTHIKEYAN ◽  
L RAVIKUMAR
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Equilibrium Concentration ◽  
Sorption Process ◽  
Complexation Reaction ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Adsorption Desorption

Abstract The adsorption of metal ions from wastewater using Schiff base cellulose bearing pendulant heterocyclic chelating groups (MC-Tz) as a sorbent is the subject of this paper. Solid state 13 C-NMR, FT-IR, SEM, and XRD spectroscopy, as well as TGA and XRD were utilized to examine the adsorbent. The batch sorption process used pH, adsorbent dose, initial adsorbate concentration, temperature, as well as contact time to calculate the metal ion levels. The optimum pH-6.0, with the complexation reaction and ion exchange phase as the mechanisms at work. To investigate the equilibrium concentration and temperature-dependent rate constants, various models, such as the Langmuir, Freundlich, Temkin, and Redlich-Peterson adsorption isotherm were utilized. A Kinetic study shows that the Langmuir is more in agreement with the Pseudo-second order Kinetic model. Adsorption-Desorption experiments over four cycles demonstrated the feasibility of the sorbent's regeneration potential and the measured values of enthalpy and entropy explain the essence of the adsorption process. The objective of this research is to discover non-toxic, environmentally friendly adsorbent biodegradable components and to conduct evaluations to determine their use in wastewater treatment.

scholarly journals Kinetic studies of manganese removal from aqueous solution by adsorption on natural zeolite

2015 ◽  
Vol 34 (1) ◽  
pp. 213 ◽  
Author(s):  
Afrodita Zendelska ◽  
Mirjana Golomeova ◽  
Krsto Blažev ◽  
Blažo Boev ◽  
Boris Krstev ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Metal Ion ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Manganese Concentration ◽  
Order Kinetic ◽  
Uptake Mechanism ◽  
Manganese Removal ◽  
Rate Determining Step ◽  
Order Kinetic Model

<p>         The kinetics of manganese adsorption onto natural zeolite (clinoptilolite) were studied with respect to initial metal ion concentration and adsorbent mass. In order to select the main rate-determining step in the overall uptake mechanism, a series of experiments were performed under batch conditions from single ion solutions. Data obtained from the kinetic experiments are interpreted in terms of Pseudo-second order kinetic model, Weber and Morris model and model proposed by Furusawa and Smith.</p><p>          The adsorption kinetics is reasonably fast. It means that in the first 20 min approximately 75% of Mn<sup>2+</sup> is adsorbed from solutions. From the kinetic data can be concluded that adsorption of manganese ions from solution by natural zeolite is more efficiency at higher adsorbent mass and at lower manganese concentration in solution. Amount of Mn adsorbed on zeolite increase at higher manganese concentration in solution.</p><p>            From the kinetic models, can be concluded that intraparticular diffusion is more likely to be the rate determining step, but at higher concentrations of Mn ions in solution, film diffusion may be take a part in a rate determining step.</p>

Kinetic Studies of Zn(II) Removal from Single and Binary Solutions by Synthetic Hydroxyapatite - Based Nanopowders

2018 ◽  
Vol 69 (6) ◽  
pp. 1293-1297
Author(s):  
Laurentiu Teodor Busuioc ◽  
Claudia Maria Simonescu ◽  
Gheorghe Nechifor ◽  
Elena Radoi ◽  
Ionut Eduard Girbea
Keyword(s):  
Heavy Metals ◽  
Metal Ion ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Point Of View ◽  
Order Kinetic ◽  
Binary Solutions ◽  
Metals Removal ◽  
Pseudo Second Order ◽  
Synthetic Hydroxyapatite

A kinetic study has been carried out with two hydroxyapatite nanopowders to establish the mechanism involved in heavy metals removal from aqueous synthetic solutions. The samples of nanohydroxyapatite have been previously characterized. The first sample represents a pure hydroxyapatite (HAP) nanopowder named HAP-1, and the second sample (HAP-2) consist of a mixture of hydroxyapatite (HAP; Ca10(PO4)6(OH)2) and b-tricalcium phosphate (b-TCP; Ca3(PO4)2). Batch experiments with single and binary Zn(II) and Pb(II) aqueous solutions have been performed. According to this research study, it was found that the both nanohydroxyapatite samples show good heavy metals adsorption capacity, and selectivity for Pb(II) ions. A more pronounced decreasing of sorption capacity of Zn(II) ions from binary solutions compared to that registered from single heavy metal ion solutions has been observed. From the kinetic point of view, the sorption process can be described for both heavy metals as a pseudo-second-order kinetic process. According to this model, the Zn(II) and Pb(II) sorption can be achieved by chemical reactions between heavy metals and functional groups of adsorbents. The obtained results are indicative of good hydroxyapatite adsorption ability towards Pb(II) and Zn(II) ions.

Equilibrium and Kinetic Studies of Copper Metal Ion Biosorption by Flavobacterium sp. as a Low-Cost Natural Biosorbent

2011 ◽  
Vol 322 ◽  
pp. 436-439 ◽  
Author(s):  
Xi Chan Zhang ◽  
Xing Guang Li
Keyword(s):  
Metal Ion ◽  
Binding Capacity ◽  
Low Cost ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Equilibrium Studies ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Present study deals with the evaluation of biosorptive removal of copper byFlavobacterium sp.Experiments have been carried out to find the effect of various parameters such as initial pH, contact time and initial metal ion concentration. Adsorption equilibrium studies showed that Cu(II) adsorption data followed the Langmuir model, the maximum binding capacity ofwas 55.20 mg/g at pH 6.0. Kinetics of copper biosorption by Flavobacterium sp. biomass is better described by pseudo second order kinetic model. It was also clearly observed that The present study indicated thatFlavobacterium sp.biomass may be used as a cost and effective biosorbent for the removal of Cu(II) ions from wastewater.

scholarly journals The Potential Use of Zeolite, Montmorillonite, and Biochar for the Removal of Radium-226 from Aqueous Solutions and Contaminated Groundwater

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1537
Author(s):  
Fahad I. Almasoud ◽  
Abdullah S. Al-Farraj ◽  
Mohammad I. Al-Wabel ◽  
Adel R.A. Usman ◽  
Yousef J. Alanazi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Groundwater Remediation ◽  
Low Cost ◽  
Kinetic Studies ◽  
Intraparticle Diffusion ◽  
Order Kinetic ◽  
Intraparticle Diffusion Model ◽  
Multistep Process ◽  
Boundary Layer Diffusion

The present work investigated the potential of using zeolite (clinoptilolite), montmorillonite (Swy2), and Conocarpus biochar as adsorbents to remove 226Ra from aqueous solution. The effect of the initial 226Ra concentrations on sorbents’ equilibrium activity concentrations and sorbents’ radium removal efficiency were investigated. The results showed that zeolite has a higher removal efficiency for 226Ra in comparison with the efficiencies of montmorillonite and biochar. In addition to the linear isotherm model, the Freundlich model, followed by Temkin’s model, provided a better description of the adsorption process than the Langmuir model. Kinetic studies indicated that a pseudo-second-order kinetic model could be the best fit for the adsorption of 226Ra onto the three investigated sorbents, which suggests that the mechanism of adsorption of 226Ra by sorbents was chemisorption. The intraparticle diffusion model indicated that adsorption of 226Ra onto the sorbents involves a multistep process: (i) boundary layer diffusion and (ii) intraparticle diffusion. Moreover, the remediation of groundwater samples polluted with 226Ra was assessed using the investigated sorbents; the results showed that zeolite also has the highest removal efficiency among other sorbents. Thus, the low cost, availability, and the high adsorption efficiency of zeolite can be a promising sorbent on 226Ra removal from aqueous solutions and groundwater remediation.

Biosorption of strontium ions from aqueous solution using modified eggshell materials

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
Sayed S. Metwally ◽  
Hoda E. Rizk ◽  
Mona S. Gasser
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Biomass Materials ◽  
Strontium Ions

AbstractGreen composites emphasize renewable starting materials for better economy using biomass materials. Therefore, low-cost composite biosorbent was prepared by modification of eggshell material using heteropoly acid for removal of strontium ions from aqueous solution. The resulted composite was characterized and evaluated for the sorption process using the batch technique. Low concentration of strontium ions was used to evaluate the sorption sensitivity of the prepared composite. The obtained experimental results illustrated that the modification process of eggshell material enhanced the percent uptake from 49.9 to 95.7%. From kinetic studies, the sorption of strontium ions follows the pseudo-second-order kinetic model. The isotherm studies indicated that Langmuir is more applicable than Freundlich isotherm. Moreover, Dubinin–Radushkevich isotherm was studied. Thermodynamic studies revealed that the sorption process is spontaneous and has endothermic nature. Strontium ions can be desorbed from the modified eggshell using HNO

scholarly journals Adsorption of Hg(II) from Aqueous Solution Using Adulsa (Justicia adhatoda) Leaves Powder: Kinetic and Equilibrium Studies

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Mohd Aslam ◽  
Sumbul Rais ◽  
Masood Alam ◽  
Arulazhagan Pugazhendi
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Sorption Process ◽  
Intraparticle Diffusion ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Equilibrium Studies ◽  
Intraparticle Diffusion Model ◽  
Pseudosecond Order

The ability of Adulsa leaves powder (ALP) to adsorb Hg(II) from aqueous solutions has been investigated through batch experiments. The ALP biomass was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The experimental parameters that were investigated in this study included pH, adsorbent dosage, and effect of contact time along with initial metal ion concentration. The adsorption process was relatively fast, and equilibrium was achieved after 40 min of contact time. The maximum removal of Hg(II), 97.5% was observed at pH 6. The adsorption data were correlated with Langmuir, Freundlich, and Temkin isotherms. Isotherms results were amply fitted by the Langmuir model determining a monolayer maximum adsorption capacity (qm) of ALP biomass equal to 107.5 mg g−1and suggesting a functional group-limited sorption process. The kinetic process of Hg(II) adsorption onto ALP biomass was tested by applying pseudofirst-order, pseudosecond-order, Elovich, and intraparticle-diffusion models to correlate the experimental data and to determine the kinetic parameters. It was found that the pseudosecond order kinetic model for Hg(II) adsorption fitted very well. The rate determining step is described by intraparticle diffusion model. These studies considered the possibility of using Adulsa plant leaves biomass as an inexpensive, efficient, and environmentally safe adsorbent for the treatment of Hg(II) contaminated wastewaters.

scholarly journals Experimental Model for Cu(II) and Fe(III) Sorption from Synthetic Solutions Based on Maize Stalk

2020 ◽  
Vol 71 (6) ◽  
pp. 355-367
Author(s):  
Nicoleta Mirela Marin ◽  
Gheorghe Batrinescu ◽  
Ioana Stanculescu ◽  
Lucian Constantin ◽  
Nicolae Ionut Cristea ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Correlation Coefficients ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Sorption Properties ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Metallic Cation ◽  
Order Kinetic Model ◽  
Desorption Study

This study is based to a new concept, to use maize stalk for specific sorption and recovery of Cu(II) and Fe(III) from synthetic solutions. Thus, the sorption properties of the biomass resulting from the recycling of the maize stalk that reached maturity (autumn) were studied. In the first stage, the sorption properties of the maize stalk were evaluated in batch system. Moreover, in terms of water quality improvement several key parameters that influence the sorption equilibrium were evaluated. The effect of contact time (0-120min) and cations initial concentration (investigated range: 0.05-0.4 mg/L) on biomaterial sorption capacity were assessed. Kinetic studies were performed taking into consideration the initial concentration of metallic cation. The experimental data were analyzed based on first order kinetic model, pseudo-second-kinetic model and Morris Webber kinetic model. The kinetics of sorption was in accordance with the pseudo - second - kinetic model as the correlation coefficients showed (R2=0.9940 for Cu(II) and R2=0.9999 for Fe(III)). Moreover the desorption study was evaluated with hydrochloric acid and have detected to be 63% and 89% for Cu(II) and Fe(III) when 4M HCl is used. The surface of the maize stalk loaded with Cu(II) and Fe(III) was characterized by various specific techniques such as FTIR-ATR, SEM, and TG. Experimental results revealed that cations sorption process takes place on the sorbent surface. The sorption rate of each metallic cation is controlled by the formation of chemical bonds with surface polar groups. Their presence on biomass structure, evidenced by FTIR-ATR analysis, explains the behavior of maize stalk as a weak ion exchanger acid.

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