scholarly journals Poly(sodium acrylate) hydrogels as potential pH-sensitive sorbents for the removal of model organic and inorganic pollutants from water

2013 ◽  
Vol 12 (3) ◽  
pp. 262-269
Keyword(s):  
Metal Ions ◽  
Crystal Violet ◽  
Metal Ion ◽  
Electrostatic Interactions ◽  
Driving Forces ◽  
Coordination Complexes ◽  
Sodium Acrylate ◽  
Inorganic Pollutants ◽  
Carboxylate Anions ◽  
Influence Of Ph

Anionic poly(sodium acrylate), PANa, hydrogels bearing negatively charged –COO- groups were used as sorbents for the removal of colored organic or inorganic model pollutants, namely Crystal Violet and Cu2+, from water. It was found that PANa hydrogels adsorb stronger Cu2+ions than Crystal Violet, as a consequence of the formation of coordination complexes between the hydrogel and the metal ions, while just electrostatic interactions are the major driving forces for Crystal Violet. Furthermore, the influence of pH, i.e. the neutralization degree i of the hydrogel, on its adsorption efficiency was investigated. It is shown that the adsorption of Cu2+ ions follows stoichiometry, namely one metal ion per two carboxylate anions. On the contrary, the adsorption of Crystal Violet is much lower than the charged stoichiometry.

scholarly journals Synthesis and Characterization of Piperidin-4-one Derivatives Using Green Solvent

2020 ◽  
Vol 32 (4) ◽  
pp. 727-732
Author(s):  
Harish Sharma ◽  
Rajesh Kumar ◽  
Mahesh Chandra Vishwakarma ◽  
Sushil Kumar Joshi ◽  
Narender Singh Bhandari
Keyword(s):  
Metal Ions ◽  
Contact Time ◽  
Metal Ion ◽  
Low Cost ◽  
Ion Concentration ◽  
Green Solvent ◽  
Optimum Ph ◽  
Influence Of Ph ◽  
Biosorption Equilibrium

In present study, Pyras pashia leaves were used as low cost biosorbent to study biosorption of Cu(II), Pb(II) and Cd(II) ions from contaminated wastewater. In the employed batch methods pH, contact time, metal ion concentration, temperature, biosorbent doses were taken as study parameters. The pH was varied from pH 1-9 to study the influence of pH on biosorption of metal ions by Pyras pashia. The optimum pH for the removal of Cu(II), Pb(II) and Cd(II) is observed at pH 5. The biosorption equilibrium time was varied between 15-75 min. Langmuir, Freundlich and Temkin isotherms were employed to study the biosorption. The biosorption parameter fits well with Langmuir isotherm. The biosorption of metal ions was increased with increasing biosorbent dose and contact time while increase in pH, metal ion concentration and temperature decrease the biosorption. Thermodynamic data suggest that the bisorption process was spontaneous, feasible and endothermic.

scholarly journals Luminescent Properties of Lanthanoid-Poly(Sodium Acrylate) Composites: Insights on the Interaction Mechanism

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1314
Author(s):  
Alan F. Y. Matsushita ◽  
María José Tapia ◽  
Alberto A. C. C. Pais ◽  
Artur J. M. Valente
Keyword(s):  
Metal Ions ◽  
Polymer Composites ◽  
Metal Ion ◽  
Interaction Mechanism ◽  
Green Emission ◽  
Luminescent Properties ◽  
Lanthanide Ions ◽  
Molar Ratio ◽  
Sodium Acrylate ◽  
Wide Range

The interaction between polyelectrolytes and metal ions is governed by different types of interactions, leading to the formation of different phases, from liquid state to weak gels, through an appropriate choice of metal ion/polyelectrolyte molar ratio. We have found that lanthanide ions, europium(III) and terbium(III), are able to form polymer composites with poly(sodium acrylate). That interaction enhances the luminescent properties of europium(III) and terbium(III), showing that Eu3+/poly(sodium acrylate) (PSA) and Tb3+/PSA composites have a highly intense red and green emission, respectively. The effect of cations with different valences on the luminescent properties of the polymer composites is analyzed. The presence of metal ions tends to quench the composite emission intensity and the quenching process depends on the cation, with copper(II) being by far the most efficient quencher. The interaction mechanism between lanthanoid ions and PSA is also discussed. The composites and their interactions with a wide range of cations and anions are fully characterized through stationary and non-stationary fluorescence, high resolution scanning electronic microscopy and X-ray diffraction.

scholarly journals Adsorption and Separation of Crystal Violet, Cerium(III) and Lead(II) by Means of a Multi-Step Strategy Based on K10-Montmorillonite

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 466 ◽  
Author(s):  
Filippo Parisi
Keyword(s):  
Metal Ions ◽  
Cation Exchange ◽  
Crystal Violet ◽  
Metal Ion ◽  
Complete Removal ◽  
Experimental Conditions ◽  
Factors Affecting ◽  
Adsorption Processes ◽  
Removal Of Metal Ions ◽  
Time Required

A multi-step procedure, based on the employment of K10-Montmorillonite, is proposed for the selective removal of metal ions and dyes from a multicomponent solution. The objective is twofold: decontaminate the effluents and separate and recover the valuable byproducts present in wastewaters. Three common contaminants, i.e., crystal violet dye (CV), Ce(III) and Pb(II) were chosen as “model” pollutants. The main factors affecting the pollutants’ sorption were investigated. The experimental data were correlated with adsorption isotherms and kinetic models to obtain a deeper insight into the adsorption processes. The affinity of the clay toward the pollutants is favored by an increasing pH and follows the order CV > Pb(II) > Ce(III). Whereas Ce(III) metal ions do not adsorb onto clay under strongly acidic conditions, both Pb(II) and CV can adsorb under all the investigated pH conditions. The analysis of isotherms and kinetic profiles revealed that CV adsorbs onto clay through a mechanism consisting of two parallel processes, namely cation exchange on the external mineral surface and in the interlayer and surface complexation at the edge sites, while metal ion uptake is due solely to cation exchange processes involving mineral surfaces. The time required for the complete removal of pollutants follows the order CV > Ce(III) >> Pb(II). The possibility to modulate the adsorption features by changing experimental conditions was successfully employed to propose the best strategy for the progressive removal of different components from aqueous solutions.

scholarly journals ADSORPSI ION LOGAM Fe DALAM LIMBAH TEKSTIL SINTESIS DENGAN MENGGUNAKAN METODE BATCH

2018 ◽  
Vol 2 (2) ◽  
pp. 68
Author(s):  
Muhammad Arief Karim ◽  
Heni Juniar ◽  
M. Fitria Putri Ambarsari
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ph Value ◽  
Batch Process ◽  
Two Factors ◽  
The Matrix ◽  
Initial Ph ◽  
Stirring Time ◽  
Influence Of Ph ◽  
Predetermined Time

Adsorption is a process occurs in a fluid, either it is liquid or gas, bonded in a solid or liquid (absorbent agent, adsorbent) and eventually creates a thin layer or film (adsorbed agent, adsorbent) on its surface. In this study, the writer did the process of the adsorption of Fe metal ion to the adsorbent of carbide waste that has been processed into tablet with 3x5 mm size, adsorption was done with Batch process by stirring 15gr or adsorbent into 100ml of synthetic waste with 50rpm stirring speed. There are two factors that influence the decrease of Fe metal concentration in synthesis waste which is the influence of pH and time. This study used variables of adsorption time (1; 2; 3; 4; 5; 6) hours with pH (2.5; 4.1) for each hour with an initial concentration of Fe 800g metal ions. This study was conducted to obtain the optimum value of pH and concentration of final Fe metal ions with the comparison of initial pH ratio and predetermined time. Seen from the matrix results of the study, it can be concluded that the longer the stirring time the more metal ions are absorbed by the adsorbent of carbide waste and pH value also rises.

scholarly journals THE INFLUENCE OF pH TOWARDS MULTIPLE METAL ION ADSORPTION OF Cu(II), Zn(II), Mn(II), AND Fe(II) ON HUMIC ACID

2010 ◽  
Vol 6 (1) ◽  
pp. 43-46 ◽  
Author(s):  
Buhani Buhani ◽  
Suharso Suharso
Keyword(s):  
Humic Acid ◽  
Metal Ions ◽  
Metal Ion ◽  
Ion Adsorption ◽  
Batch Method ◽  
Metal Ion Adsorption ◽  
Before And After ◽  
General Capacity ◽  
Adsorption Energies ◽  
Influence Of Ph

Multiple metal ions adsorption of Cu(II), Zn(II), Mn(II) and Fe(II) on humic acid with a batch method has been carried out at pH interaction of 3, 5, and 6. Concentration of metal ions in solution before and after interaction was analyzed with Atomic Absorption Spectrophotometer (AAS). Result showed that adsorption multiple metal ions of Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid is optimum at pH 5. Adsorption energies of the multiple metal ions Cu(II), Zn(II), Mn(II), and Fe(II) on humic acid at pH 3, 5, and 6 are around 35.0 - 37.6 kJ/mole. In general, capacity of competition adsorption of the multiple metal ions has an order as follows; Cu(II) < Fe(II) < Zn(II) < Mn(II).   Keywords: Humic acid, adsorption, multiple metal

Stability constants for some 1:1 metal–carboxylate complexes

1970 ◽  
Vol 48 (11) ◽  
pp. 1654-1656 ◽  
Author(s):  
John W. Bunting ◽  
Kain Men Thong
Keyword(s):  
Metal Ions ◽  
Stability Constants ◽  
Metal Ion ◽  
Divalent Metal ◽  
Metal Carboxylate ◽  
Divalent Metal Ions ◽  
Carboxylate Complexes ◽  
Carboxylate Anions

Stability constants have been measured for the formation of 1:1 complexes between eight divalent metal ions and six carboxylate anions. For each anion the stabilities of the complexes follow the order Pb2+ > Cu2+ > Cd2+ > Zn2+ > Ni2+ ~ Co2+ > Ca2+ ~ Mg2+. The stabilities of the complexes with each metal ion are directly related to the basicities of the anions, and little or no bidentate chelation occurs between these metal ions and acetoxyacetic acid or N-acetylglycine.

scholarly journals POLAROGRAPHIC BEHAVIOUR OF SOME DIVALENT METAL COMPLEXES OF 4-METHOXYBENZALDEHYDE THIOSEMICARBAZONE

2021 ◽  
Vol 9 (02) ◽  
pp. 751-765
Author(s):  
Renu Saraswat ◽  
◽  
Devesh Saraswat ◽  
Keyword(s):  
Stability Constant ◽  
Metal Ions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Coordination Complexes ◽  
Divalent Metal ◽  
Sharp Change ◽  
Substitution Reactions ◽  
Polarographic Behaviour ◽  
Divalent Metal Complexes

Analysis of the complexes formed by 4-methoxybenzaldehyde thiosemicarbazone with Manganese (II), Iron (II),Cobalt (II) ,Nickel (II) and Zinc(II) metal ions was made through the polarographic technique. 4-methoxybenzaldehyde thiosemicarbazone was obtained by the reaction of hydrazinecarbothioamide with para-methoxybenzaldehyde in ethyl alcohol. Polarographic technique is best suited for the study of coordination complexes and their substitution reactions and more significantly the technique is especially useful in calculating stability constant of complexes that are formed by direct combination of metal ion and the ligands. A sharp change is observed in the E1/2 values of the transition metal ions in presence of the ligand indicating complexation .Irreversible polarographic behaviour has been shown in all the compounds studied and kinetic parameter αn and ko f ,h have been calculated .All the complexes prepared were found to have 1:2 stoichiometry.

Use of agro-waste (Musa paradisiaca peels) as a sustainable biosorbent for toxic metal ions removal from contaminated water

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Contact Time ◽  
Metal Ion ◽  
Equilibrium Concentration ◽  
Ion Concentration ◽  
Contaminated Water ◽  
Musa Paradisiaca ◽  
Percentage Removal ◽  
Adsorbent Dose

A study of removal of heavy metal ions from heavy metal contaminated water using agro-waste was carried out with Musa paradisiaca peels as test adsorbent. The study was carried by adding known quantities of lead (II) ions and cadmium (II) ions each and respectively into specific volume of water and adding specific dose of the test adsorbent into the heavy metal ion solution, and the mixture was agitated for a specific period of time and then the concentration of the metal ion remaining in the solution was determined with Perkin Elmer Atomic absorption spectrophotometer model 2380. The effect of contact time, initial adsorbate concentration, adsorbent dose, pH and temperature were considered. From the effect of contact time results equilibrium concentration was established at 60minutes. The percentage removal of these metal ions studied, were all above 90%. Adsorption and percentage removal of Pb2+ and Cd2+ from their aqueous solutions were affected by change in initial metal ion concentration, adsorbent dose pH and temperature. Adsorption isotherm studies confirmed the adsorption of the metal ions on the test adsorbent with good mathematical fits into Langmuir and Freundlich adsorption isotherms. Regression correlation (R2) values of the isotherm plots are all positive (&gt;0.9), which suggests too, that the adsorption fitted into the isotherms considered.

The Binding and Viscometric Studies of Ni+2, Co+2 and Mn+2 Ions with Protein by Spectrometric and pH Metric Techniques

2019 ◽  
Vol 9 (2) ◽  
pp. 151-162
Author(s):  
Shveta Acharya ◽  
Arun Kumar Sharma
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Protein Molecule ◽  
Vital Role ◽  
Sufficient Evidence ◽  
Structural Requirement ◽  
Nickel Ions ◽  
Cobalt Ions ◽  
Lower Temperature ◽  
Specific Oxidation

Background: The metal ions play a vital role in a large number of widely differing biological processes. Some of these processes are quite specific in their metal ion requirements. In that only certain metal ions, in specific oxidation states, can full fill the necessary catalytic or structural requirement, while other processes are much less specific. Objective: In this paper we report the binding of Mn (II), Ni (II) and Co (II) with albumin are reported employing spectrophotometric and pH metric method. In order to distinguish between ionic and colloidal linking, the binding of metal by using pH metric and viscometric methods and the result are discussed in terms of electrovalent and coordinate bonding. Methods: The binding of Ni+2, Co+2 and Mn+2 ions have been studied with egg protein at different pH values and temperatures by the spectrometric technique. Results: The binding data were found to be pH and temperature dependent. The intrinsic association constants (k) and the number of binding sites (n) were calculated from Scatchard plots and found to be at the maximum at lower pH and at lower temperatures. Therefore, a lower temperature and lower pH offered more sites in the protein molecule for interaction with these metal ions. Statistical effects seem to be more significant at lower Ni+2, Co+2 and Mn+2 ions concentrations, while at higher concentrations electrostatic effects and heterogeneity of sites are more significant. Conclusion: The pH metric as well as viscometric data provided sufficient evidence about the linking of cobalt, nickel and manganese ions with the nitrogen groups of albumin. From the nature and height of curves in the three cases it may be concluded that nickel ions bound strongly while the cobalt ions bound weakly.

Sign in / Sign up

Export Citation Format

Share Document