scholarly journals Cadmium Removal from Aqueous Systems UsingOpuntia albicarpaL. Scheinvar as Biosorbent

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Rosa Icela Beltrán-Hernández ◽  
Gabriela Alejandra Vázquez-Rodríguez ◽  
Luis Felipe Juárez-Santillán ◽  
Ivan Martínez-Ugalde ◽  
Claudia Coronel-Olivares ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Functional Groups ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Aqueous Systems ◽  
Cadmium Removal ◽  
Ph Values ◽  
Natural Adsorbent ◽  
Low Concentrations ◽  
Heating Up

The aim of this research was to investigate the use of a natural adsorbent like nopal (Opuntia albicarpaL. Scheinvar) for removing cadmium from aqueous solutions with low concentrations of this metal. Two treatments were applied to the cladodes: a dehydration to get dehydrated nopal (DHN) and heating up to 90°C to obtain a thermally treated nopal (TN). After examining the effect of various pH values (2–7), the capacity of each biosorbent was examined in batch sorption tests at different dosages (0, 500, 1000, 1500, 2000, and 3000 mg L−1). The results indicated that adsorption of cadmium to biomass of DHN and TN was highly dependent on pH and biosorbent dosage. The best removal of cadmium (53.3%, corresponding toqeof 0.155 mg g−1) was obtained at pH 4.0 by using the TN sorbent. Infrared and Raman spectra confirmed that cadmium removal occurred via adsorption to –OH functional groups.

Protonation du N,N-diméthylformamide: étude par spectrométries vibrationnelle et électronique

1975 ◽  
Vol 53 (3) ◽  
pp. 442-447 ◽  
Author(s):  
P. Combelas ◽  
M. Costes ◽  
C. Garrigou-Lagrange
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Protonation Equilibrium ◽  
Ionization Equilibria

Infrared and Raman spectra of acidic (hydrochloric or sulfuric) aqueous solutions of dimethylformamide indicate the existence of a single protonation equilibrium.[Formula: see text]The pK for this reaction was evaluated as −1.35 ± 0.05 from u.v. spectra; a less precise value (−1.1 ± 0.5) was obtained from Raman spectra. This result disagrees with earlier conclusions which favored the existence of two ionization equilibria for dimethylformamide. [Journal translation]

The Characteristic Pattern of Thioamides in Infrared and Raman Spectra

1978 ◽  
Vol 32 (1) ◽  
pp. 101-105 ◽  
Author(s):  
H. O. Desseyn ◽  
B. J. van der Veken ◽  
M. A. Herman
Keyword(s):  
Potential Energy ◽  
Energy Distribution ◽  
Functional Groups ◽  
Raman Spectra ◽  
Characteristic Pattern ◽  
Potential Energy Distribution ◽  
Infrared And Raman Spectra ◽  
Pattern Characteristic

A number of simple products, containing the thioamide functional groups, have been investigated in infrared and Raman spectra; from the average appearance and potential energy distribution values, a pattern characteristic for the thioamide groups has been given.

Vibrational Spectral Studies of Hexaquozinc Nitrate and Hexaquozinc Nitrate-d2

1971 ◽  
Vol 49 (9) ◽  
pp. 1510-1514 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Deuterium Oxide ◽  
Ionic Association ◽  
Spectral Studies ◽  
Site Symmetry ◽  
Infrared And Raman Spectra ◽  
Concentrated Aqueous Solutions ◽  
Site Group ◽  
A Site

Infrared and Raman spectra are reported for the hexaquozinc nitrate crystal. Replacement of water by deuterium oxide causes a remarkable intensity reversal of components in the ν3 nitrate region and provides Raman spectra free from interference in the 2ν2 and ν4 regions. The nitrate spectrum is interpreted in terms of a site group approximation. The spectra are compared with those of concentrated aqueous solutions and partially dehydrated crystals to point up changes which result from a lowered site symmetry and those which result from ionic association.

scholarly journals Utilization of agricultural and industrial wastes for metal removal from aqueous solutions

2011 ◽  
Vol 13 (1) ◽  
pp. 20-22 ◽  
Author(s):  
Marta Biegańska ◽  
Ryszard Cierpiszewski
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Metal Removal ◽  
Order Equation ◽  
Industrial Wastes ◽  
Cadmium Removal ◽  
Cadmium Ions ◽  
Ph Values ◽  
Freundlich Equation ◽  
Pseudo Second Order

Utilization of agricultural and industrial wastes for metal removal from aqueous solutions In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.

Low frequency vibrational spectra of lithium formate monohydrate and its aqueous solutions

1983 ◽  
Vol 61 (10) ◽  
pp. 2282-2284 ◽  
Author(s):  
A. Agarwal ◽  
D. P. Khandelwal ◽  
H. D. Bist
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Tetrahedral Structure ◽  
Structure Of Water ◽  
Lithium Formate ◽  
Lithium Formate Monohydrate

The far infrared and Raman spectra of polyerystalline lithium formate monohydrate and the Rayleigh wing scattering of its aqueous solutions are reported. Three new bands in solid and bands due to librations of HCOO− and the quasi-tetrahedral structure of water in solutions have been identified.

scholarly journals Cadmium Removal from Aqueous Solutions by Strain of Pantoea agglomerans UCP1320 Isolated from Laundry Effluent

2018 ◽  
Vol 12 (1) ◽  
pp. 297-307 ◽  
Author(s):  
Leonila. M. L. Acioly ◽  
Davi Cavalcanti ◽  
Marcos C. Luna ◽  
José C. V. Júnior ◽  
Rosileide F. S. Andrade ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Environmental Concern ◽  
Low Cost ◽  
Bacterial Biomass ◽  
Pantoea Agglomerans ◽  
Cadmium Removal ◽  
Work Related ◽  
Low Concentrations ◽  
Positive Effect

Background: Cadmium (Cd), which is a deadly heavy metal of work-related and environmental concern, has been recognized as a substance that is teratogenic and carcinogenic for humans. Therefore, the need to develop low-cost adsorbents to remove heavy metals from aqueous solution has greatly increased. Adsorbents such as Pantoea agglomerans biomass have been used. Aims: We investigated the biotechnological potential of Pantoea agglomerans for the biosorption of cadmium from aqueous solution. Patients and Methods: Pantoea agglomerans UCP1320 isolated from the effluent of a laundry industry was used to remove cadmium from aqueous solutions. Two approaches were compared using active or thermally inactivated biomass. Three different cadmium concentrations of 1, 10 and 100 ppm were used under constant stirring at temperatures of 25°C and 35°C as was pH of 3.0, 5.0 and 7.0. Variable incubation times of 1, 6, and 24h were also studied. Results: The results showed that the temperature did not influence the uptake of metal by living cells nor by inactive bacterial biomass. However, increasing the pH had a positive effect on removing intermediate concentrations of cadmium. Low concentrations of cadmium were completely removed by both live and inactive biomass. Conclusion: Pantoea agglomerans biomass was shown to have a promising performance for the biotechnological removal of cadmium which had been dissolved in aqueous solution.

Effects of Inorganic Orthophosphate and Pyrophosphate on Dissolution of Calcium Fluoride in Water

1988 ◽  
Vol 67 (2) ◽  
pp. 447-449 ◽  
Author(s):  
F. Lagerlöf ◽  
E. Saxegaard ◽  
P. Barkvoll ◽  
G. Rølla
Keyword(s):  
Aqueous Solutions ◽  
Calcium Fluoride ◽  
Clinical Studies ◽  
Slow Release ◽  
Dental Enamel ◽  
Fluoride Release ◽  
Ph Values ◽  
Rate Of Dissolution ◽  
Low Concentrations ◽  
Ph Dependent

Calcium and fluoride release from excess solid calcium fluoride was monitored for 15-30 min in aqueous solutions containing various concentrations of inorganic orthophosphate and pyrophosphate. Low concentrations of these ions (1-10 μmol/L) considerably inhibited the rate of dissolution of calcium fluoride. This inhibition was pH-dependent, being reduced at pH values below 5. It is suggested that a reduced calcium fluoride dissolution rate, in the presence of phosphate, can account for the relatively slow loss of calcium fluoride from dental enamel observed in recent clinical studies. It also appears that calcium fluoride coated with phosphate may provide a pH-controlled slow release of fluoride that may be of clinical significance and a major component of the cariostatic mechanism of topically applied fluoride.

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