Zirconium decontamination from aqueous media using lateritic minerals

AbstractThe sorption behavior of zirconium on minerals from a lateritic weathering has been carried out to evaluate its potential for the decontamination of zirconium ions from aqueous solutions. Various physico-chemical parameters such as selection of appropriate electrolyte, equilibration time, amount of adsorbent, concentration of adsorbate, effect of diverse ions and temperature were studied in order to simulate the best conditions under which this material can be used as an adsorbent, employing batch method and radiotracer technique. Maximum adsorption was observed at 0.005 mol L

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Mordanting of mercury on styrene-divinylbenzene copolymer beads from aqueous solutions

Radiochimica Acta ◽

10.1524/ract.2007.95.5.281 ◽

2007 ◽

Vol 95 (5) ◽

Cited By ~ 1

Author(s):

Nasir Khalid ◽

Saqib Ali ◽

Arif Iqbal ◽

Shujaat Ahmad

Keyword(s):

Aqueous Solutions ◽

Contact Time ◽

Aqueous Media ◽

Mercury Ions ◽

Chemical Parameters ◽

Radiotracer Technique ◽

Physico Chemical ◽

Styrene Divinylbenzene ◽

Selection Of

The sorption of mercury ions from aqueous solutions on styrene-divinylbenzene copolymer beads (St-DVB) has been investigated for the decontamination of mercury from aqueous media. Various physico-chemical parameters, such as selection of appropriate electrolyte, contact time, amount of adsorbent, concentration of adsorbate, effect of diverse ions and temperature were optimized to simulate the best conditions which can be used to decontaminate mercury from aqueous media using St-DVB beads as an adsorbent. The radiotracer technique was used to determine the distribution of mercury. The highest adsorption was observed at 0.001 mol L

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Sequestering of thorium ions from aqueous media on rice husk: Equilibrium, kinetic and thermodynamic studies

Radiochimica Acta ◽

10.1515/ract-2014-2294 ◽

2015 ◽

Vol 103 (5) ◽

Cited By ~ 2

Author(s):

Shagufta Zafar ◽

Nasir Khalid ◽

Muhammad Latif Mirza

Keyword(s):

Metal Concentration ◽

Rice Husk ◽

Aqueous Media ◽

Equilibration Time ◽

Adsorption Behaviour ◽

Batch Method ◽

Radiotracer Technique ◽

Thermodynamic Studies ◽

Kinetic And Thermodynamic Studies

AbstractThe adsorption behaviour of thorium on rice husk has been studied by optimizing different parameters like nature of electrolyte, amount of adsorbent, equilibration time, metal concentration, and temperature, employing batch method and radiotracer technique. Maximum adsorption was observed at 0.0001 mol L

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Elimination of Chromium (VI) and Cadmium(II) from Aqueous Solutions by Adsorption onto Olive Stones

The Open Chemical Engineering Journal ◽

10.2174/1874123100903010041 ◽

2009 ◽

Vol 3 (1) ◽

pp. 41-48 ◽

Cited By ~ 6

Author(s):

Karima Rouibah ◽

Abdeslam-Hassen Meniai ◽

Mohamed Tahar Rouibah ◽

Lazhar Deffous ◽

Mossaab Bencheikh Lehocine

Keyword(s):

Aqueous Solutions ◽

Adsorption Process ◽

Agitation Speed ◽

Optimal Conditions ◽

Chemical Parameters ◽

Liquid Ratio ◽

Chromium Vi ◽

Olive Stones ◽

Physico Chemical ◽

Pseudo Second Order

The present study concerns the test of olive stones as an adsorbent for removing Cd(II) and Cr(VI) from aqueous solutions. The experimental elimination of the two cations was carried out batchwise and the influence of certain physico-chemical parameters such as the contact time, the pH of the solution, the temperature, the solid to liquid ratio, the agitation speed were also considered. The equilibrium adsorption capacity of the olive stones for the case of Cr(VI) followed the Langmuir model, whereas for the Cd(II) cations, the two models i.e. Langmuir and Freundlich were equally representative. The adsorption process was found to be of pseudo second order and the rate constants were determined for both cations. The Gibbs free energy sign was negative for the adsorption of both cations, indicating that the process was spontaneous. Finally the olive stones retained chromium more than cadmium, but at optimal conditions, high removal percentages were reached, for both cations.

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Evaluation of electrical conductivity, pH and refractive index as physico-chemical parameters for quality control of Aveloz homeopathic solutions

International Journal of High Dilution Research - ISSN 1982-6206 ◽

10.51910/ijhdr.v10i36.505 ◽

2021 ◽

Vol 10 (36) ◽

pp. 108-109

Author(s):

Isabella Oliveira Silva ◽

Rafael Harduim Cardoso ◽

Carlos Renato Zacharias ◽

Sheila Garcia ◽

Carla Holandino

Keyword(s):

Electrical Conductivity ◽

Refractive Index ◽

Aqueous Solutions ◽

Phorbol Esters ◽

Refractive Index Change ◽

Control Group ◽

Chemical Parameters ◽

Physico Chemical ◽

Starting Point ◽

Significant Difference

Euphorbia tirucalli Lineu (Aveloz) belongs to the family Euphorbiaceae and is used in the treatment of cancer and warts. Some studies have reported that phorbol esters are the active principles responsible for the antitumor activity of Aveloz. The production of these molecules occurs in greater quantity in May, during the morning. This study aimed to evaluate whether the physico-chemical parameters of Aveloz homeopathic aqueous solutions such as pH, electrical conductivity and refractive index change due to storage time. Such parameters were measured regularly for 180 days. All solutions were prepared according to the method of grinding with lactose and subsequent dissolution in aqueous medium, as described in the Brazilian Homeopathic Pharmacopoeia, using as starting point the Aveloz latex collected in May. Homeopathic aqueous solutions containing only lactose were also prepared and evaluated as a control group. The potencies that were analyzed for electrical conductivity, pH and refractive index were: 4cH, 7cH, 9cH, 12cH, 14cH, 15cH, 29cH, 30cH. As a result, we found out that there was only statistical difference (p=0.035) in electrical conductivity between the homeopathic solutions containing Aveloz and the homeopathic solutions without Aveloz, when 15cH potency was compared. We also observed that the electrical conductivity increased with the aging of the solutions but is not directly related to the pH or the refractive index of the solutions, indicating that the aging process may alter the electrical conductivity of the homeopathic medicines. The presence of gas inside the glass that stores these solutions may affect the electrical conductivity measurements. Finally, no statistically significant difference was observed (p> 0.05) in the pH and refractive index.

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Chromatographic parameters, pKa, and surface activity of a series of hydrochlorides of perhydroazepinylethyl esters of alkoxyphenylcarbamic acids and their relation to anaesthetic activity

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19851133 ◽

1985 ◽

Vol 50 (5) ◽

pp. 1133-1140 ◽

Cited By ~ 5

Author(s):

Marie Blešová ◽

Jozef Čižmárik ◽

Mária Bachratá ◽

Želmíra Bezáková ◽

Alois Borovanský

Keyword(s):

Biological Activity ◽

Regression Analysis ◽

Aqueous Solutions ◽

Surface Activity ◽

Local Anaesthetic ◽

Chemical Properties ◽

Surface Tensions ◽

Chemical Parameters ◽

Physico Chemical ◽

Chromatographic Parameters

Hydrochlorides of perhydroazepinylethyl esters of alkoxyphenylcarbamic acids were separated by adsorption and partition TLC. The surface tensions, γ, of aqueous solutions of the compounds were measured and the values of pKa were determined. The relation between structure and physico-chemical properties has been confirmed by the dependences of RM and γ on the number of carbon atoms in the alkoxyl chain. Employing the method of regression analysis, the physico-chemical parameters of lipophilicity and the surface activity were correlated, and their effect on biological activity (relative local anaesthetic efficacy) has been assessed.

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