Search results

1

Chlorates(VII) removal on Dowex™PSR-2 resin

100%

Kołodyńska D., Łyko A., Gęca M., Hubicki Z.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

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2016

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vol. 71

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issue 1

EN

Lately there has been observed the increased presence of chlorates(VII) in the natural environment which can affect human health negatively. Therefore the removal of chlorate(VII) ions using the gel type resin functionalized with the tri-n-butyl ammonium (Dowex™PSR-2) from waters was studied. The main aim was to evaluate the effects of experimental conditions including contact time, initial solution concentration, pH and temperature on chlorate(VII) ions removal as well as the anion exchanger properties on chlorate(VII) ions sorption. It was found that only the pseudo second order model described the experimental data well and the intraparticle diffusion was not the rate-limiting step. According to the Freundlich model, the qe value was to be 69.26 mg/g at optimum conditions (pH 7.0 at 25 oC).

2

Performance analysis of cation and anion exchangers in water treatment plant: an industrial case study

100%

Ramzan N., Feroze N., Kazmi M., Ashraf M., Hasan S.

Polish Journal of Chemical Technology

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2012

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vol. 14

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issue 2

35-41

EN

Performance of cation and anion exchangers was evaluated by carrying out breakthrough analyses of pH, conductivity, free mineral acid (FMA) and various dissolved solids for an industrial water treatment plant of 700 gpm capacity. The breakthrough curves showed no leakage of calcium, magnesium and chloride throughout the operating period of the train, however, they indicated the early leakage of sodium, potassium, sulphate and silica. The operating/breakthrough capacity, total capacity and degree of column utilization were determined. The column utilization was found to be 67.85%, 38.93% and 16.78% against the design values of 90%, 85% and 85% for cation, primary and secondary anion exchangers respectively. The operating time of the water treatment train was significantly increased by achieving adequate capacity utilization of secondary anion exchanger. The low capacity utilization of secondary anion resin due to early silica slippage, has been discussed in the paper.

3

The Use of Ion Exchange in the Recovery of Vanadium from the Mass of a Spent Catalyst Used in the Oxidation of SO2to SO3

100%

Drużyński S., Mazurek K., Białowicz K.

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 2

69-73

EN

In the studies on the recovery of vanadium from vanadium catalyst extracts, three types of polymer strongly acidic ion exchangers were used. The ion exchange resins differed in terms of granularity and their ion exchange capacity. As a result, breakthrough curves were made for three main components of the test extract, i.e.: ions of vanadium, iron and potassium. On this basis the optimum conditions for the removal of iron ions from the solution were defined and the technological concept of the process in the semi-technical scale was proposed.

4

Research of Co2+ ions removal from water solution by using ion exchangers

88%

Bożęcka A., Sanak-Rydlewska S.

Gospodarka Surowcami Mineralnymi

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2018

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vol. 34

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issue 3

5

Promising method of ion exchange separation of anions before reverse osmosis

75%

Trus I., Gomelya M., Vorobyova V., Skіba M., Trus I., Gomelya M., Vorobyova V., Skіba M.

Archives of Environmental Protection

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2021

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vol. 47

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issue 4

6

Laser Granulometer as an Useful Tool for Selection of Appropriate Membranes Used in the MIEX® DOC-UF/MF Hybrid Process

63%

Rajca M., Bray R. T., Fitobór K., Gołombek K.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 3

7

The impact of various cations on the sorption of manganese in the thallus of freshwater algae spirogyra sp. and sea algae palmaria palmata

63%

Rajfur M., Jóźwiak M. A., Kłos A.

Ecological Chemistry and Engineering S

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2014

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vol. 21

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issue 1

35-43

EN

Due to their occurrence in very different conditions and high resistance to physical and chemical factors, algae are pioneers colonising new environments and their sorption properties are used in biomonitoring and water remediation. The efficiency of the process of heavy metal sorption in algae used for in situ tests depends on abiotic factors, such as the chemical composition of water. Freshwater algae Spirogyra sp. were used in tests. Algae were exposed in the laboratory in manganese chloride solutions with various contents of other cations, including heavy metals and macronutrients. It has been shown that some heavy metals may desorb manganese bound to the surface of algae as a result of ion exchange in the following sequence: Cd2+ < Mn2+ ≈ Zn2+ < Cu2+. It has been also found that the competitiveness of sorption of cations naturally present in the alga environment versus Mn2+ cations changes in the sequence Na+ < Ca2+ < H+, defined for the concentrations referring to the cation unit charge. The results of tests were compared to the results of dried sea algae Palmaria palmata analyses.

PL

Glony ze względu na występowanie w bardzo zróżnicowanych warunkach i dużą odporność na czynniki fizykochemiczne należą do pionierów zasiedlających nowe środowiska, a ich właściwości sorpcyjne są wykorzystywane w biomonitoringu i remediacji wód. Wydajność procesu sorpcji metali ciężkich na glonach wykorzystywanych do badań in situ uzależniona jest od czynników abiotycznych, m.in. od składu chemicznego wody. Do badań wykorzystano słodkowodne glony Spirogyra sp., które w warunkach laboratoryjnych eksponowano w roztworach chlorku manganu o różnym udziale innych kationów, m.in. metali ciężkich i makroelementów. Wykazano, że niektóre metale ciężkie mogą desorbować mangan związany powierzchniowo na glonach wskutek wymiany jonowej, w szeregu Cd2+ < Mn2+ ≈ Zn2+< Cu2+. Stwierdzono również, że konkurencyjność sorpcji kationów naturalnie występujących w środowisku bytowania glonów w stosunku do kationów Mn2+ zmienia się zgodnie z szeregiem: Na+ < Ca2+ < H+, wyznaczonym dla stężeń molowych odniesionych do jednostkowego ładunku kationu. Wyniki badań porównano z wynikami analiz przeprowadzonych na suszonych glonach morskich Palmaria palmata.

Refine search results

Chlorates(VII) removal on Dowex™PSR-2 resin

Performance analysis of cation and anion exchangers in water treatment plant: an industrial case study

The Use of Ion Exchange in the Recovery of Vanadium from the Mass of a Spent Catalyst Used in the Oxidation of SO2to SO3

Research of Co2+ ions removal from water solution by using ion exchangers

Promising method of ion exchange separation of anions before reverse osmosis

Laser Granulometer as an Useful Tool for Selection of Appropriate Membranes Used in the MIEX® DOC-UF/MF Hybrid Process

The impact of various cations on the sorption of manganese in the thallus of freshwater algae spirogyra sp. and sea algae palmaria palmata