Adsorption kinetics of nitrate ions on ion exchange resin

Hekmatzadeh, Ali Akbar; Karimi-Jashni, Ayoob; Talebbeydokhti, Nasser; Kløve, Bjørn

doi:10.1016/j.desal.2013.07.017

Cited by 53 publications

(27 citation statements)

References 35 publications

(71 reference statements)

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“…For all experimental data shown in this figure, it can be seen that the removal efficiency was increased with the increase of algal biomass weight from 0.05 to 1 g, implying that the optimum amount of biosorbent is 1 g algal biomass/200 ml solution, then beyond 1 g algal biomass dose the removal efficiency reached a plateau which demonstrating the equilibrium state. The reason being that an increase in the biosorbent quantity in the aqueous solution results in a larger exchangeable sites or surface area for Pb(II) sorption, hence the rise in the removal percentage (Hekmatzadeh, et al, 2013). By further increment in sorbent dose, the removal capacity was not increased possibly due to the aggregation of sorbent particles and low surface area.…”

Section: Resultsmentioning

confidence: 99%

On the optimal use of isotherm models for the characterization of biosorption of lead onto algae

Brouers

Al-Musawi

2016

Preprint

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For the first time we apply a new method based on the mathematical derivation of some known isotherm from the Burr function which describes many birth-death (sorption-desorption) phenomena in ecology and economy. Therefore, in this study the experimental isotherm data of biosorption of Pb(II) onto algae was modeled to Langmuir, Hill-Sips, Brouers-Sotolongo, Brouers-Gaspard, and Redlich-Peterson isotherm models. The parameters of each model were determined by non linear fitting algorithms using Mathematica program. The maximum Pb(II) removal rate increased with the increase of temperature and reached the maximum value (98%) at the temperature of 40 °C. The results showed that the Hill-Sips and the Brouers-Sotolongo isotherms were definitely the most suitable models to satisfactorily describe biosorption of Pb(II) on the algal biomass. In addition, as these two models gave very close results, the use of an intermediate one the Brouers-Gaspard isotherm model could also describe the sorption in most cases. High coefficient of determination values were obtained by using non linear methods and these findings are contrary to most works in this field that use linearization methods. Further, this study showed that a complete set of data is necessary to have a good representation of the isotherm and using only coefficient of determination is not always an adequate tool to compare the goodness of the non linear fit of an isotherm models.

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Section: Resultsmentioning

confidence: 99%

On the optimal use of isotherm models for the characterization of biosorption of lead onto algae

Brouers

Al-Musawi

2016

Preprint

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“…After this time, the adsorbent separation from the solution is carried out by the filter paper and the concentration of the solution is determined. Then the amount and adsorption efficiency are determined from relations 1 and 2 (Bhatnagar et al, 2010;Hekmatzadeh et al, 2013). 2,3,4,5,10,15,20,30,40 and 50 g of wheat straw is added to 100 mL of solution at a concentration of 20 mg/L.…”

Section: Methodsmentioning

confidence: 99%

Kinetics Modeling and Isotherms for Adsorption of Nitrate from Aqueous Solution by Wheat Straw

Ahmadpari

Noghany

Ladez

et al. 2019

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Nitrate is a colorless, odorless chemical substance with a chemical formulation of NO3- and average mass of 62.0049 gr/ Mol. According to an announcement of the world health organization (WHO), the standard amount of Nitrate in potable water is at most 50 ml/ lit (based on nitrate). Nitrate enters into the body and is transformed to nitrite by digestive system’s bacteria, then enters to the circulatory system and oxides the exiting iron in Hemoglobin of blood which converts the iron capacity from 2 to 3. As a result of this process Hemoglobin is converted to Methemoglobin which has far more less capacity in oxygen delivery. Therefore, the tissues cannot receive sufficient oxygen and it causes a disease called “Methemoglobinemia”. The objective of this study was to investigate the nitrate removal using wheat straw and determining the adsorption isotherms and kinetics. In this study, nitrate solutions were prepared from potassium nitrate salt. The pH values of the solutions were adjusted by NaOH and HCl at a concentration of 0.1 molar. The pH of the solution was adjusted to different values (4 to 13). Kinetics models of Ho et al and Lagergren were used to describe the data. Isotherm models of Langmuir and Freundlich were used to describe the data. The results showed that the maximum capacity of wheat straw in nitrate adsorption occurred at pH=6 and contact time 140 minutes. Equilibrium models (Langmuir and Freundlich) and non-equilibrium (Ho et al and Lagergren) were used to investigate the adsorption process. Comparing the determination coefficients between measured data and obtained value from Ho’s model (R2= 0.97) and Lagergren model (R2= 0.91) showed that the Ho’s model describes experimental data better. Also, comparing the Langmuir and Freundlich isotherm for nitrate adsorption by wheat straw showed that Freundlich isotherm (R2= 0.98) was more proper than Langmuir isotherm (R2= 0.83) in describing adsorption process.

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“…It is generally assumed that the ion-exchange reactions between the adsorbed ions and functional groups are instantaneous, and thus, the sorption process is restricted by film transfer and intraparticle diffusion. Consequently, the particle diffusion model was adopted to investigate the real sorption rate [38], where the relevant parameters, the film mass-transfer coefficient k f (m/s), and pore diffusivity D p (m/s 2 ) were also calculated.…”

Section: Mathematical Modelsmentioning

confidence: 99%

Removal of V(V) From Solution Using a Silica-Supported Primary Amine Resin: Batch Studies, Experimental Analysis, and Mathematical Modeling

Huang

Chen

et al. 2020

Molecules

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Every year, a large quantity of vanadium-containing wastewater is discharged from industrial factories, resulting in severe environmental problems. In particular, V(V) is recognized as a potentially hazardous contaminant due to its high mobility and toxicity, and it has received considerable attention. In this study, a silica-supported primary amine resin (SiPAR) was prepared by in-situ polymerization, and the V(V) adsorption from the solution was examined. The as-prepared resin exhibited fast adsorption kinetics, and it could attain an equilibrium within 90 min for the V(V) solution concentration of 100 mg/L at an optimum pH of 4, whereas the commercial D302 resin required a treatment time of more than 3 h under the same conditions. Furthermore, the maximum adsorption capacity of the resin under optimum conditions for V(V) was calculated to be 70.57 mg/g. In addition, the kinetics and isotherm data were satisfactorily elucidated with the pseudo-second-order kinetics and Redlich–Peterson models, respectively. The silica-based resin exhibited an excellent selectivity for V(V), and the removal efficiency exceeded 97% in the presence of competitive anions at 100 mmol/L concentrations. The film mass-transfer coefficient (kf) and V(V) pore diffusivity (Dp) onto the resins were estimated by mathematical modeling. In summary, this study provided a potential adsorbent for the efficient removal of V(V) from wastewater.

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Adsorption kinetics of nitrate ions on ion exchange resin

Cited by 53 publications

References 35 publications

On the optimal use of isotherm models for the characterization of biosorption of lead onto algae

On the optimal use of isotherm models for the characterization of biosorption of lead onto algae

Kinetics Modeling and Isotherms for Adsorption of Nitrate from Aqueous Solution by Wheat Straw

Removal of V(V) From Solution Using a Silica-Supported Primary Amine Resin: Batch Studies, Experimental Analysis, and Mathematical Modeling

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