The removal of phosphate ions from aqueous solution by fly ash, slag, ordinary Portland cement and related blends
Phosphate ions have been removed from aqueous solution by fly ash, slag, ordinary Portland cement (OPC) and related cement blends. The rate and efficiency of PO 4 3− removal were found to increase in the order: fly ash, slag, OPC, apparently mimicking the order of increasing percent CaO in the adsor...
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| Published in: | Cement and concrete research Vol. 32; no. 12; pp. 1889 - 1897 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
01-12-2002
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| Abstract | Phosphate ions have been removed from aqueous solution by fly ash, slag, ordinary Portland cement (OPC) and related cement blends. The rate and efficiency of PO
4
3− removal were found to increase in the order: fly ash, slag, OPC, apparently mimicking the order of increasing percent CaO in the adsorbents. Blending OPC with fly ash or slag evidently results in diminished PO
4
3− removal efficiency. Better removal was obtained at higher solute concentration, acidic pH and higher temperature. The effect of particle size and the speed of mixing were found not to be significant. A first-order kinetic model was used to obtain values for overall sorption rate constants and intraparticle diffusion constants. The Frumkin isotherm was found to be the appropriate equation for modelling isotherms from the experimental adsorption data, and values have been obtained for the isotherm constants. A 400-mg/l PO
4
3− (as P) solution was fed at a steady velocity of 2.0 cm/min through a 2.0-cm fixed-bed column (at pH 9.0 and 25 °C), and breakthrough curves were constructed to obtain estimated adsorption capacity values of 32, 60, 75, 78 and 83 mg PO
4
3−/g adsorbent for fly ash, slag, OPC+fly ash, OPC+slag and OPC, respectively. |
|---|---|
| AbstractList | Phosphate ions have been removed from aqueous solution by fly ash, slag, ordinary Portland cement (OPC) and related cement blends. The rate and efficiency of PO
4
3− removal were found to increase in the order: fly ash, slag, OPC, apparently mimicking the order of increasing percent CaO in the adsorbents. Blending OPC with fly ash or slag evidently results in diminished PO
4
3− removal efficiency. Better removal was obtained at higher solute concentration, acidic pH and higher temperature. The effect of particle size and the speed of mixing were found not to be significant. A first-order kinetic model was used to obtain values for overall sorption rate constants and intraparticle diffusion constants. The Frumkin isotherm was found to be the appropriate equation for modelling isotherms from the experimental adsorption data, and values have been obtained for the isotherm constants. A 400-mg/l PO
4
3− (as P) solution was fed at a steady velocity of 2.0 cm/min through a 2.0-cm fixed-bed column (at pH 9.0 and 25 °C), and breakthrough curves were constructed to obtain estimated adsorption capacity values of 32, 60, 75, 78 and 83 mg PO
4
3−/g adsorbent for fly ash, slag, OPC+fly ash, OPC+slag and OPC, respectively. |
| Author | Potgieter, J.H. Strydom, C.A. Agyei, N.M. |
| Author_xml | – sequence: 1 givenname: N.M. surname: Agyei fullname: Agyei, N.M. email: nana@univen.ac.za organization: Department of Chemistry, University of Venda, Private Bag X5050, Thohoyandou 0950, South Africa – sequence: 2 givenname: C.A. surname: Strydom fullname: Strydom, C.A. organization: Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa – sequence: 3 givenname: J.H. surname: Potgieter fullname: Potgieter, J.H. organization: Department of Chemical and Metallurgical Engineering, Pretoria Technikon, P.O. Box 56208, Arcadia, Pretoria 0007, South Africa |
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| Cites_doi | 10.1016/0008-8846(71)90020-2 10.1080/01496399608001027 10.1016/S0043-1354(99)00135-9 10.1016/0008-8846(94)90183-X 10.1016/S0008-8846(00)00225-8 10.1021/ie50512a049 10.1021/je9502253 10.1016/S0043-1354(97)00204-2 10.1016/S0304-3894(00)00201-6 |
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| EndPage | 1897 |
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| Keywords | Phosphate ions Slag Fly ash OPC Adsorption Frumkin isotherm |
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| SubjectTerms | Adsorption Fly ash Frumkin isotherm OPC Phosphate ions Slag |
| Title | The removal of phosphate ions from aqueous solution by fly ash, slag, ordinary Portland cement and related blends |
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