The Role of Temperature in Ion Exchange Processes of Separation and Purification

Иванов, В. А.; Дроздова, Н. В.; Горшков, В. И.; Timofeevskaya, V. D.

doi:10.1533/9781845698652.4.307

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…The mechanism of the degradation of quaternary ammonium salts and tertiary anions is well-known (Reynolds, 1982;Fernandez-Prini, 1982;Fisher, 2002). The effect of temperature on the properties of chelating ion exchangers was also described in the paper by Ivanov (1996).…”

Section: Gel and Macroporous Resinsmentioning

confidence: 95%

Selective Removal of Heavy Metal Ions from Waters and Waste Waters Using Ion Exchange Methods

Hubicki¹,

Kołodyńska²

2012

Ion Exchange Technologies

109

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Ion Exchange Technologies 194gastrointestinal tract less than 10% cadmium is absorbed. An important source of human exposure to cadmium is food and water. In natural water its typical concentration lies below 0.001 mg/dm 3 , whereas, the upper limit recommended by EPA (Environmental Protection Agency) is less than 0.003 mg/dm 3 . The maximum limit in drinking water is 0.003 mg/dm 3 .Cadmium accumulates in kidneys, pancreas, intestines and glands altering the metabolism of the elements necessary for the body, such as zinc, copper, iron, magnesium, calcium and selenium. Damage to the respiratory tract and kidneys are the main adverse effects in humans exposed to cadmium compounds. In humans exposed to fumes and dusts chronic toxicity of cadmium compounds is usually found after a few years. The main symptom of emphysema is that it often develops without preceding bronchitis. The second basic symptom of chronic metal poisoning is kidney damage. It includes the loss and impairment of smell, pathological changes in the skeletal system (osteoporosis with spontaneous fractures and bone fractures), pain in the extremities and the spine, difficulty in walking, the formation of hypochromic anemia. The most known 'Itai-Itai' disease caused by cadmium exposure is mixed osteomalacia and osteoporosis. However, an important source of cadmium in soils are phosphate fertilizers. Large amounts of cadmium are also introduced to soil together with municipal waste. The high mobility of cadmium in all types of soils is the reason for its rapid integration into the food chain. Daily intake of cadmium from food in most countries of the world is 10-20 mg.Lead is a toxic metal, which accumulates in the vital organs of men and animals and enters into the body through air, water and food. According to the WHO (World Health Organization) standards, its maximum limit in drinking water is 0.05 mg/dm 3 but the maximum discharge limit for lead in wastewater is 0.5 mg/dm 3 . Its cumulative poisoning effects are serious haematological damage, anaemia, kidney malfunctioning, brain damage etc. Chronic exposure to lead causes severe lesions in kidney, liver, lungs and spleen.Lead is used as industrial raw material in the manufacture of storage batteries, pigments, leaded glass, fuels, photographic materials, matches and explosives. Lead being one of very important pollutants comes from wastewaters from refinery, wastewaters from production of basic compounds containing lead, wastewaters with the remains of after production solvents and paints. Large toxicity of lead requires that its contents are reduced to the minimum (ppb level). To this end there are applied chelating ions with the functional phosphonic and aminophosphonic groups. Also weakly basic anion exchangers in the free base form can be used for selective removal of lead(II) chloride complexes from the solutions of pH in the range 4-6. Also a combined process of cation exchange and precipitation is often applied for lead(II) removal form wastewaters (Pramanik et al. 2009). The average colle...

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Section: Gel and Macroporous Resinsmentioning

confidence: 95%

Selective Removal of Heavy Metal Ions from Waters and Waste Waters Using Ion Exchange Methods

Hubicki¹,

Kołodyńska²

2012

Ion Exchange Technologies

109

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“…Pb(II) does not present significant changes when temperature of contact was increased, however, mercury retention experiment was observed as temperature increases from 20 to 35°C and the retention also increase from 0.019 to 0.026 mmol/g resin, corresponding to an increment of 20.7% of retention. The result can be explained considering that an increase on temperature also increase the kinetic energy of metal ion, promoting the diffusion of metal ions and favoring the exchange process [16].…”

Section: Sorption Experimentsmentioning

confidence: 99%

Mercury and lead sorption properties of poly(ethyleneimine) coated onto silica gel

et al. 2011

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In this article, we studied the sorption properties of poly(ethyleneimine) coated on silica gel for metal ions with impact on the environment, such as Zn(II), Cd(II), Hg(II), and Pb(II). The experiments were carried out by batch procedure and the effects of pH, concentration, and temperature were evaluated. In addition, the selectivity was studied for binary, ternary, and quaternary metal ion mixtures. Mercury and lead showed promising results, achieving higher than 65% of sorption after only 1 h of contact. Under competitive conditions, resin presented high selectivity toward Hg(II) reaching 91 and 87% of retention respect to total amount of ions for binary and quaternary mixtures, respectively. The effect of time on Pb(II) and Hg(II) sorption was studied by batch procedure and the experimental data were adjusted to pseudo-first-order, pseudo-second-order, and intra-particle diffusion models. Pseudo-second-order model presented good agreement for Pb(II) sorption, while pseudo-first-order model fits better to Hg(II) sorption. Intra-particle diffusion model showed that sorption process is controlled mainly by film diffusion.

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“…Возможность применения этого метода к конкретным системам связана с существованием сильной зависимости адсорбции целевого компонента от температуры. Теоретические основы данного метода и примеры его практического применения описаны в [1][2][3][4][5][6][7].…”

Section: Introductionunclassified

Study of the Possibility of Two-Temperature Sorption Concentration of Boron and Sulfate-ion Compounds on Activated Carbon

Sveshnikova¹,

Rabadanova²

2020

HDSU

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The Role of Temperature in Ion Exchange Processes of Separation and Purification

Cited by 4 publications

References 1 publication

Selective Removal of Heavy Metal Ions from Waters and Waste Waters Using Ion Exchange Methods

Selective Removal of Heavy Metal Ions from Waters and Waste Waters Using Ion Exchange Methods

Mercury and lead sorption properties of poly(ethyleneimine) coated onto silica gel

Study of the Possibility of Two-Temperature Sorption Concentration of Boron and Sulfate-ion Compounds on Activated Carbon

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