Modeling batch kinetics of cesium, cobalt and strontium ions adsorption from aqueous solutions using hydrous titanium oxide

2007 ◽  
Vol 95 (7) ◽  
Author(s):  
E. Metwally ◽  
R. O. Abdel Rahman ◽  
R. R. Ayoub
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Titanium Oxide ◽  
Contact Time ◽  
Cobalt Ions ◽  
Batch Kinetics ◽  
Batch Technique ◽  
Strontium Ions ◽  
Kinetics Of

Hydrous titanium oxide was chemically synthesized and tested as adsorbent material for the removal of cesium, cobalt and strontium ions from chloride waste solutions using batch technique. The influences of pH, contact time, and temperature have been reported. The uptake of both strontium and cobalt ions was found to be greater than that of cesium and the apparent sorption capacity of each ion increases with increase in temperature. Thermodynamic parameters such as changes in Gibbs free energy (Δ

scholarly journals Study on Adsorption of Cu and Ba from Aqueous Solutions Using Nanoparticles of Origanum (OR) and Lavandula (LV)

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ghadah M. Al-Senani ◽  
Foziah F. Al-Fawzan
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Free Energy ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Solution Ph ◽  
Environment Friendly ◽  
Removal Of Heavy Metals ◽  
Equilibrium Data ◽  
Langmuir And Freundlich Models

Wild herbs (Origanum (OR) and Lavandula (LV)) were used as environment-friendly adsorbents in this study. The adsorbents were used for adsorption of Cu and Ba from water. The adsorption of heavy metals onto OR and LV was dependent on particle size, dose, and solution pH. The diameter of adsorbent particles was less than 282.8 nm. The adsorption follows second-order kinetics. Langmuir and Freundlich models have been applied to describe the equilibrium data, and the thermodynamic parameters, the Gibbs free energy, ∆G°, enthalpy, ∆H°, and entropy, ∆S°, have been determined. The positive value of ∆H° suggests that the adsorption of heavy metals by the wild herbs is endothermic. The negative values of ∆G° at all the studied temperatures indicate that the adsorption is a spontaneous process. It can be concluded that OR and LV are promising adsorbents for the removal of heavy metals from aqueous solutions over a range of concentrations.

Removal of Xylenol Orange from Solutions by γ-Cyclodextrin-Grafted Carboxymethyl Cellulose

2011 ◽  
Vol 204-210 ◽  
pp. 1180-1183 ◽  
Author(s):  
Xiao Li Xiong ◽  
Chen Bin Shao
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Carboxymethyl Cellulose ◽  
Contact Time ◽  
Xylenol Orange ◽  
Free Energy Change ◽  
Energy Change ◽  
Batch Experiments ◽  
Adsorption Capacities ◽  
Adsorption Temperature

The potential to remove xylenol orange (XO) from aqueous solutions through adsorption on γ-cyclodextrin-grafted carboxymethyl cellulose (CCMC) was investigated in batch experiments. The effects of contact time, adsorption temperature and initial XO concentration were discussed. Results of batch experiments showed that CCMC exhibited some sorption capacities towards XO. It was found that isotherm fitted Languir and Freundlich models for the adsorption of XO on CCMC. On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 29.9, 27.1, 21.9, 16.2 and 16.1 mg of XO per gram of CCMC at 283, 288, 293, 298 and 303K, respectively. The negative values of free energy change indicated the spontaneous nature of adsorption.

scholarly journals The Removal of Uranium and Thorium from Aqueous Solutions Onto by-pass Cement Dust (BCD)

2016 ◽  
Vol 11 (2) ◽  
pp. 105
Author(s):  
Ali Omnia M. ◽  
El-Kashif H.H. ◽  
Sayed S.A. ◽  
Shalabi M.E.H.
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Freundlich Isotherm ◽  
Adsorption Behavior ◽  
Energy Of Activation ◽  
Optimum Conditions ◽  
Cement Dust ◽  
Initial Concentration ◽  
First Order ◽  
Batch Technique

<p>The adsorption behavior of uranium and thorium from aqueous solutions by By-pass cement dust (BCD) has been investigated by a batch technique. The uranium and thorium adsorption on BCD was studied as a function of initial concentration, weight of BCD, pH, shaking time and temperature. The uptake of uranium and thorium at the determined optimum conditions follows Freundlich isotherm. The adsorption control of both thorium and uranium are first order and uptake energy of activation E<sub>a</sub> =10 and 15 kJ/mol for thorium and uranium respectively. Thermodynamic parameters such as ΔH<sup>o</sup>, ΔS<sup>o</sup> and ΔG<sup>o</sup> were also investigated.</p>

scholarly journals Cadmium and Lead Adsorption Capacities of Nigerian Ultisol Soil of Tropics

2019 ◽  
Vol 35 (3) ◽  
pp. 1004-1012 ◽  
Author(s):  
Henry Olumayowa Oluwasola ◽  
Jonnie Niyi Asegbeloyin ◽  
Alfred Ezinna Ochonogor ◽  
Julius Udeh Ani ◽  
Collins Ugochukwu Ibeji ◽  
...  
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Sorption Process ◽  
Maximum Adsorption Capacity ◽  
Lead Adsorption ◽  
Adsorption Capacities ◽  
Batch Technique ◽  
Pseudo Second Order ◽  
Cadmium And Lead ◽  
Kinetics Of

The study investigates the sorption of cadmium (Cd) and lead (Pb) by Nsukka urban soils, a Nigeria soil classified as an ultisol soil of tropics. Laboratory batch technique was utilized to investigate the effect of pH, temperature, contact time, and concentration on the adsorption process. Results showed that adsorption efficiency of the soils for Cd2+ and Pb2+ increased with increase in pH, temperature, and contact time but decreased with increase in concentration. The data from adsorption study was fitted to the Langmuir, Freundlich and Temkin adsorption isotherms, and results revealed that Langmuir isotherm fitted most satisfactorily. On the basis of the obtained maximum adsorption capacity (qmax) from the Langmuir model, the affinity of Cd and Pb for the studied soil was Pb2+ > Cd2+. Pseudo-second order (r2 ≥ 0.995-0.999) best described the kinetics of the sorption process for the metal ions in the soil.

scholarly journals Removal of Lead Ions from Aqueous Solutions by a Novel Ficus carica L.-Zeolite-Alginate Biocomposite

2018 ◽  
Author(s):  
Meruyert Kaygusuz ◽  
Cem Gök
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Contact Time ◽  
Lead Concentration ◽  
Ficus Carica ◽  
Lead Ions ◽  
Initial Concentration ◽  
Biosorption Process

In this study, fig leaves, zeolite and alginate were used to prepare a biocomposite for the adsorption of Pb(II) ions from aqueous solutions. Effects of various parameters on the biosorption process such as pH, temperature, initial lead concentration and contact time have been investigated. Maximum uptake of Pb(II) ions (85%) has been achieved at pH 6, with 25 mg/L of initial concentration and at a temperature of 288.15 K. Among the applied models, the data correlated well with Freundlich and D-R models and it was established that the biosorption was physical in nature. The amount of adsorbed lead per gram of sorbent was found to be 150.3 mg/g. Thermodynamic parameters showed the exothermic heat of biosorption and the feasibility of the process. Results have suggested that the prepared biosorbent possesses promising biosorption potential.

scholarly journals Synthesis of new series of Pyrazoline, and study their Kinetics and Reaction Mechanism

2019 ◽  
Vol 7 (2) ◽  
pp. 5-13
Author(s):  
Kosrat N. Kaka ◽  
Salam G. Taher ◽  
Wali M. Hamad ◽  
Aram H. Ibrahim
Keyword(s):  
Free Energy ◽  
Reaction Mechanism ◽  
Thermodynamic Parameters ◽  
Compensation Effect ◽  
New Products ◽  
Order Reaction ◽  
Membered Ring ◽  
Free Energies ◽  
First Order ◽  
Kinetics Of

A new series of novel pyrazoline compounds were synthesized by addition of thiosemicarbazide to the 2,6-dibenzylidenecyclohexanone (Chalcone) and its para substituted derivatives. This study was conducted for four purposes. Firstly, a series of five membered ring pyrazoline compounds were synthesized and the structure of all new products obtained are supported by spectral data (1H-NMR, 13CNMR, IR and UV-Vis.), and the effect of substituents were studied. Secondly, the reaction kinetics of the new synthesized compounds were studied to investigate the reaction mechanism pathway and order of the reaction; it was found that, the reaction undergoes via Claisen route of mechanism with first-order reaction. Thirdly, the thermodynamics of the reaction were studied, the rate of the reaction, Arrhenius parameters (A), and thermodynamic parameters for activation includes (free energies (Ea), entropies (ΔS#), and Gibbs free energy (ΔG#) were estimated. Finally, the compensation effect was also studied, and found the same pathway for all of the synthesized pyrazoline compounds.

Thermodynamical detection of hydrophobic hydration of tris(2,4-pentanedionato)-cobalt(III) and tris(3,5-heptanedionato)cobalt(III) in water

1991 ◽  
Vol 69 (9) ◽  
pp. 1388-1393 ◽  
Author(s):  
Yasuki Yoshimura
Keyword(s):  
Free Energy ◽  
Aqueous Solutions ◽  
Temperature Dependence ◽  
Key Words ◽  
Thermodynamic Parameters ◽  
Hydrophobic Hydration ◽  
Thermodynamic Quantities ◽  
Temperature Range ◽  
Entropy Formula ◽  
Energy Formula

The solubilities of tris(2,4-pentanedionato)cobalt(III) and tris(3,5-heptanedionato)cobalt(III) in water, heptane, and 1,2-ethanediol were determined over the temperature range 5–50 °C and from these data the thermodynamic quantities of solution at 25 °C were estimated. The free energy [Formula: see text], enthalpy [Formula: see text], and entropy [Formula: see text] of transfer of these chelates from heptane to some solvents were calculated from the corresponding thermodynamic quantities of solution. When [Formula: see text] and [Formula: see text] were separately plotted against [Formula: see text], the data of transfer from heptane to water deviated markedly from a correlation obtained for the data of transfer to the solvents other than water. This finding indicates that these chelates are subject to hydrophobic hydration in their aqueous solutions. The solubility of tris(glycinato)cobalt(III) in water was also determined over the temperature range 5–60 °C and its temperature dependence of the solubility is compared with that for the cobalt(III) chelates of the β-diketones. Key words: tris cobalt(III) chelates of β-diketones and glycine, temperature dependence of solubility, thermodynamic parameters of solution, thermodynamic parameters of transfer, hydrophobic hydration.

Removal of trace thorium(IV) from aqueous solutions using a pseudo-polyrotaxane

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Huijun Liu ◽  
Shanxia Deng ◽  
Lanlin Lei ◽  
Zhiyuan Feng ◽  
Caixia Qi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Thermodynamic Parameters ◽  
Contact Time ◽  
Experimental Results ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Optimum Conditions ◽  
Dose Concentration ◽  
Adsorbent Dose

Abstract The adsorption of thorium(IV) was studied using a pseudo-polyrotaxane, which was obtained by the reaction of poly(propyleneglycol) (PPG) and 6-OTs-β-CD. The adsorption of thorium(IV) was examined as a function of the contact time, pH of the solution, adsorbent dose, concentration of thorium(IV) and temperature using batch adsorption experiments. The experimental results suggested that the optimum conditions were found to be at pH 3.5, contact time 40 min, 10 mg adsorbent doses, 20 mg L−1 thorium(IV) concentration and 298 K. The maximum adsorption capacity was found to be 15.366 mg g−1. The thermodynamic parameters (ΔG0<0, ΔH0<0) were calculated, the result showed that the adsorption of thorium(IV) was exothermic and spontaneous process.

Adsorption of Dye from Aqueous Solution by Palm Leaves

2014 ◽  
Vol 539 ◽  
pp. 823-826
Author(s):  
Hong Hai Sun
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Rhodamine B ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Sorption Process ◽  
Color Removal ◽  
Adsorption Behavior ◽  
Solution Ph ◽  
Batch Kinetics

In this study, the palm leaves powder was used as adsorbent for the removal of rhodamine B (RhB) from aqueous solutions. The effects of initial RhB concentrations, adsorbent dosage, initial solution pH and contact time on the amount of color removal was investigated. Batch kinetics and isotherm studies were conducted to evaluate the adsorption behavior of the palm leaves powder. TheLangmuir and Freundlich isotherm model were used to describe the equilibria data. Further, the kinetics involved in the sorption process was evaluated at different initial RhB concentrations.

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