Chemically enhanced coffee husks as bio-sorbents for the removal of copper and nickel ions from aqueous solutions: study on kinetic parameters

2018 ◽  
Vol 121 ◽  
pp. 291-304 ◽  
Author(s):  
J. Arun ◽  
R. Sushma ◽  
B.S. Darshan ◽  
M. Pandimadevi
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Parameters ◽  
Nickel Ions

Photosensitised oxidation of a water pollutant using sulphonated porphyrin

2012 ◽  
Vol 66 (2) ◽  
Author(s):  
Marta Gmurek ◽  
Jacek Miller
Keyword(s):  
Aqueous Solutions ◽  
Singlet Oxygen ◽  
Kinetic Parameters ◽  
Oxygen Content ◽  
Oxidation Mechanism ◽  
Type Ii ◽  
Reaction Solution ◽  
Endocrine Disrupting ◽  
Water Pollutant ◽  
Molecular Singlet Oxygen

AbstractPhotodegradation of endocrine disrupting butylparaben (BP) in aerated aqueous solutions was studied using 4,4′,4″,4‴-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulphonic acid) (TPPS4), as a sensitiser. Influence of various parameters, such as initial sensitiser and BP concentration, pH of the reaction solution and oxygen content in the reaction solution, on the photosensitised oxidation was examined. It was found that the dominant pathway of BP degradation occurred in the reaction with molecular singlet oxygen 1O2, i.e. via photosensitised oxidation mechanism of type II. Kinetic parameters of the BP reaction with 1O2 were estimated.

Second-Order Kinetic Model for the Sorption of Cu(II) Ions in Aqueous Solutions of Zeolite NaA

2012 ◽  
Vol 560-561 ◽  
pp. 1174-1177 ◽  
Author(s):  
Dimitar Petrov Georgiev ◽  
Bogdan Iliev Bogdanov ◽  
Yancho Hristov ◽  
Irena Markovska
Keyword(s):  
Kinetic Model ◽  
Aqueous Solutions ◽  
Kinetic Parameters ◽  
Linear Equations ◽  
Linear Method ◽  
Second Order ◽  
Order Kinetic ◽  
Zeolite Naa ◽  
Order Kinetic Model ◽  
Pseudo Second Order

In this study, the sorption of Cu(II) ions in aqueous solutions of Zeolite NaA by performing batch kinetic sorption experiments. The equilibrium kinetic data were analyzed using the pseudo-second-order kinetic model. A comparison was made of the linear least-squares method and nonlinear method of the widely used pseudo-second-order kinetic model for the sorption of Cu(II) ions of Zeolite . Four pseudo-second-order kinetic linear equations are discussed. Kinetic parameters obtained from the four kinetic linear equations using the linear method differed but they were the same when using the non-linear method. Kinetic parameters obtained from four kinetic linear equations using the linear method differed. Equation type 1 pseudo-second-order kinetic model very well represented the kinetic of the adsorption Cu(II) ions by Zeolite NaA. Equation type 4 exhibited the worst fit. Present investigation showed that the non-linear method may be a better way to determine the kinetic parameters.

scholarly journals Potential of Staphylococcus xylosus strain for recovering nickel ions from aqueous solutions

2017 ◽  
Author(s):  
A. Al-Gheethi ◽  
A. N. Efaq ◽  
R. M. Mohamed ◽  
M. Abdel-Monem ◽  
M. Amir Hashim
Keyword(s):  
Aqueous Solutions ◽  
Nickel Ions ◽  
Staphylococcus Xylosus

Biosorption of nickel ions from aqueous solutions by natural and modified peanut husks: equilibrium and kinetics

2017 ◽  
Vol 32 (2) ◽  
pp. 276-284 ◽  
Author(s):  
Katerina Atkovska Burevska ◽  
Hamdije Memedi ◽  
Kiril Lisichkov ◽  
Stefan Kuvendziev ◽  
Mirko Marinkovski ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Nickel Ions ◽  
Equilibrium And Kinetics

scholarly journals FEATURES OF EXTRACTION OF COPPER, ZINC AND NICKEL IONS FROM AQUEOUS SOLUTIONS BY NATURAL SORBENTS, ACTIVATED MICROWAVES

2020 ◽  
Vol 2020 (60) ◽  
pp. 55-67
Author(s):  
Oksana MYAKUSH ◽  
◽  
Leonid SYSA ◽  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
High Energy ◽  
Natural Sorbent ◽  
Natural Sorbents ◽  
Nickel Ions ◽  
Sorption Ability ◽  
Copper Zinc ◽  
Sorption Parameters

The article is a continuation of a series of scientific works of the authors on the study of the influence of microwave irradiation on the sorption parameters of natural sorbents in the processes of purification of natural and wastewater. Using the atomic absorption method, the sorption ability of the natural sorbent clinoptilolite (zeolite type of structure) to remove Copper, Zinc and Nickel ions from aqueous solutions was studied. It was found that different variants of microwave activation of this mineral (series «Nat», «Stim» and «DIR») lead to a significant increase in the sorption capacity of clinoptilolite by ions of these heavy metals. It is shown that in comparison with similar activation schemes of another natural sorbent of bentonite (clay material), the improvement of sorption parameters of clinoptilolite with respect to heavy metals is not as significant as in the case of bentonite. It is confirmed that in almost all solutions the deposition of heavy metals on clinoptilolite occurs according to the Langmuir or Langmuir-Freundlich model. A similar situation was observed in previous works of the authors on the deposition of heavy metals on bentonite. Using scanning electron microscopy, energy dispersion spectroscopy and X-ray phase analysis, it was found that the deposition of heavy metals on both bentonite and clinoptilolite occurs not only in the form of monolayers of hydrated ions in sorbent micropores (classical model), but also in the form of individual compounds. metals. It has been suggested that the action of microwaves on these sorbents in aqueous solutions improves the structure of their micropores and affects the surface charge, so some parts of the adsorbent become active centers of crystallization of new phases - heavy metal compounds. During adsorption of heavy metal by natural bentonite or clinoptilolite, low-energy adsorption centers predominate, whereas in the case of microwave-irradiated samples of these sorbents, the experimental data correspond to a symmetric quasi-Gaussian distribution of adsorption energy where low- and high-energy regions are present. This fact indicates that electromagnetic treatment stimulates the formation of new adsorption centers.

scholarly journals Simultaneous Removal of Lead and Nickel Ions from Aqueous Synthetic Solutions by Chitosan Coated Cobalt Ferrite

2017 ◽  
Vol 68 (1) ◽  
pp. 1-5
Author(s):  
Rodica Elena Patescu ◽  
Claudia Maria Simonescu ◽  
Cristian Onose ◽  
Teodor Laurentiu Busuioc ◽  
Daiana Elena Pasarica ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Cobalt Ferrite ◽  
Second Order ◽  
Simultaneous Removal ◽  
Order Model ◽  
Diffusion Kinetic ◽  
Nickel Ions ◽  
Pseudo Second Order

This research study deals with lead and nickel simultaneous removal from aqueous solutions by the use of chitosan coated cobalt ferrite as adsorbent. Batch removal tests were performed in order to establish the main parameters that influence the sorption capacity, removal efficiency and the selectivity of this adsorbent. The values of sorption capacity for lead and nickel experimentally determined are: 56.23 mg/g and respectively 45.11 mg/g. Langmuir and Freundlich adsorption isotherms were used to interpret the sorption experimental data. The kinetic data were explored by pseudo-first order, pseudo-second order and intraparticle diffusion kinetic models. The experimental data were well fitted with the pseudo-second order model for both heavy metals. The main conclusion that can be drawn from this research is that this material can be successfully used for the removal of lead and nickel from binary aqueous solutions and wastewater.

Impact of Lignosulfonates on the Thermodynamic and Kinetic Parameters of Malvidin-3-O-glucoside in Aqueous Solutions

2018 ◽  
Vol 66 (25) ◽  
pp. 6382-6387 ◽  
Author(s):  
Paula Araújo ◽  
Nuno Basílio ◽  
Ana Fernandes ◽  
Nuno Mateus ◽  
Victor de Freitas ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Parameters ◽  
Thermodynamic And Kinetic Parameters
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