The effect of the physical structure of a porous Ca-based sorbent on its phosphorus removal capacity

Khadhraoui, Moncef; Watanabe, Takashi; Kuroda, Masao

doi:10.1016/s0043-1354(02)00096-9

Cited by 47 publications

(36 citation statements)

References 19 publications

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“…Another attractive feature of this technique is that the nutrient-loaded filters can be used in agriculture as phosphate fertilizer and soil conditioner [11]. Various materials, including natural minerals, industrial by-products (fly ash, steel slag and red mud) and synthetic adsorbents, have been used to remove phosphate from wastewater [12][13][14][15]. Among them, iron (hydr)oxides, including amorphous hydrous ferric oxide, poorly crystalline hydrous ferric oxide (ferrihydrite) [16], goethite and akaganeite [17], are well-known due to their high affinity toward phosphate, low cost, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Enhanced adsorption of phosphate from aqueous solution by nanostructured iron(III)–copper(II) binary oxides

Gao

Zhang

et al. 2014

Chemical Engineering Journal

179

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Section: Introductionmentioning

confidence: 99%

Enhanced adsorption of phosphate from aqueous solution by nanostructured iron(III)–copper(II) binary oxides

Gao

Zhang

et al. 2014

Chemical Engineering Journal

179

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“…A large number of materials from natural minerals to synthetic ones have been used as adsorbents to adsorb phosphate from wastewater [11][12][13][14][15]. Recently, the application of low cost and easily available materials for phosphate removal has been widely investigated, such as fly ash [16][17][18], blast furnace slag [19][20][21], iron oxide tailing [22], red mud [23,24], Ca-based adsorbents, and iron-based compounds [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Zhang

Liu

et al. 2009

Journal of Colloid and Interface Science

386

155

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a b s t r a c tPhosphate removal is important in the control of eutrophication of water bodies and adsorption is one of the promising approaches for this purpose. A Fe-Mn binary oxide adsorbent with a Fe/Mn molar ratio of 6:1 for phosphate removal was synthesized by a simultaneous oxidation and coprecipitation process. Laboratory experiments were carried out to investigate adsorption kinetics and equilibrium, in batch mode. The effects of different experimental parameters, namely contact time, initial phosphate concentration, solution pH, and ionic strength on the phosphate adsorption were investigated. The adsorption data were analyzed by both Freundlich and Langmuir isotherm models and the data were well fit by the Freundlich isotherm model. Kinetic data correlated well with the pseudo-second-order kinetic model, suggesting that the adsorption process might be chemical sorption. The maximal adsorption capacity was 36 mg/g at pH 5.6. The phosphate adsorption was highly pH dependent. The effects of anions such as Cl À ; SO 4 2À , and CO 3 2À on phosphate removal were also investigated. The results suggest that the presence of these ions had no significant effect on phosphate removal. The phosphate removal was mainly achieved by the replacement of surface hydroxyl groups by the phosphate species and formation of inner-sphere surface complexes at the water/oxide interface. In addition, the adsorbed phosphate ions can be effectively desorbed by dilute NaOH solutions. This adsorbent, with large adsorption capacity and high selectivity, is therefore a very promising adsorbent for the removal of phosphate ions from aqueous solutions.

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“…There is a need for highly efficient and selective methods for the sequestration of phosphate from point sources of wastewater. Examples of current research on phosphate sorbents studied for environmental sequestration include the use of waste materials such as blast furnace slags [3,4], ash from coal combustion [5][6][7][8] and paper sludge [9], metal-doped citrus processing waste [10] and red mud from bauxite processing [6]; synthetic and naturally occurring minerals and materials [11][12][13][14][15] and novel ion exchange materials [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Calcium–phosphorus interactions at a nano-structured silicate surface

Southam

Lewis

McFarlane

et al. 2008

Journal of Colloid and Interface Science

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Nano-structured calcium silicate (NCS), a highly porous material synthesized by controlled precipitation from geothermal fluids or sodium silicate solution, was developed as filler for use in paper manufacture. NCS has been shown to chemisorb orthophosphate from an aqueous solution probably obeying a Freundlich isotherm with high selectivity compared to other common environmental anions. Microanalysis of the products of chemisorption indicated there was significant change from the porous and nano-structured morphology of pristine NCS to fibrous and crystalline morphologies and non-porous detritus. X-ray diffraction analysis of the crystalline products showed it to be brushite, CaHPO42H2O, while the largely X-ray amorphous component was a mixture of calcium phosphates. A two-step mechanism was proposed for the chemisorption of phosphate from an aqueous solution by NCS. The first step, which was highly dependent on pH, was thought to be desorption of hydroxide ions from the NCS surface. This was kinetically favoured at lower initial pH, where the predominant form of phosphate present was H2PO(-)4, and led to decreased phosphorus uptake with increasing pH. The second step was thought to be a continuing chemisorption process after stabilization of the pH-value. The formation of brushite as the primary chemisorption product was found to be consistent with the proposed mechanism.

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The effect of the physical structure of a porous Ca-based sorbent on its phosphorus removal capacity

Cited by 47 publications

References 19 publications

Enhanced adsorption of phosphate from aqueous solution by nanostructured iron(III)–copper(II) binary oxides

Enhanced adsorption of phosphate from aqueous solution by nanostructured iron(III)–copper(II) binary oxides

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Calcium–phosphorus interactions at a nano-structured silicate surface

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