Adsorption–desorption mechanism of phosphate by immobilized nano-sized magnetite layer: Interface and bulk interactions

Zach-Maor, Adva; Semiat, Raphael; Shemer, Hilla

doi:10.1016/j.jcis.2011.07.062

Cited by 71 publications

(36 citation statements)

References 16 publications

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“…(b)), indicating that more phosphate was adsorbed on ACF‐FeOH. The binding energy of P (133.6 eV) in ACF‐FeOH after adsorption and ACF‐FeO after adsorption is in agreement with values reported by other articles …”

Section: Resultssupporting

confidence: 91%

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Different performances and mechanisms of phosphate adsorption onto metal oxides and metal hydroxides: a comparative study

Zhang

Gao

et al. 2015

J. Chem. Technol. Biotechnol.

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BACKGROUND Adsorption plays a significant role in phosphate removal and recovery. Metal (hydro)oxides are the most popular adsorbents for phosphate adsorption, but their performances differ greatly, with different adsorption mechanisms under different conditions. A comparative study of phosphate adsorption onto iron hydroxide and iron oxide doped activated carbon fiber (ACF‐FeOH and ACF‐FeO) was performed. RESULTS The phosphate adsorption performance of ACF‐FeOH and ACF‐FeO with different initial pH, ion strength and competing ions was investigated. The contrasting results showed that the amount adsorbed by ACF‐FeOH is higher than that by ACF‐FeO, and phosphate adsorption on ACF‐FeOH is more dependent on pH and ion strength than on ACF‐FeO. The adsorption mechanisms were studied by zeta potential measurements, X‐ray photoelectron spectroscopy (XPS) analysis and batch desorption tests. The significantly higher isoelectric point (IEP) of ACF‐FeOH with respect to that of ACF‐FeO resulted in a greater phosphate adsorption by ACF‐FeOH than by ACF‐FeO. XPS analysis showed that the concentration of surface hydroxyl groups on ACF‐FeOH is also higher than that on ACF‐FeO. CONCLUSION ACF‐FeOH performs better than ACF‐FeO with higher adsorption capacity. Electrostatic interaction and ion exchange are the two main adsorption mechanisms both for ACF‐FeOH and for ACF‐FeO. This study should provide some guidance on the preparation and application of iron‐based sorbents in phosphorus removal and recovery. © 2015 Society of Chemical Industry

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Section: Resultssupporting

confidence: 91%

“…These results indicate that phosphate desorption within the NaOH solution is predominantly a surface reaction. The hydroxyl ions only replace the adsorbed phosphate ions at the surface outer biding sites …”

Section: Resultsmentioning

confidence: 99%

Different performances and mechanisms of phosphate adsorption onto metal oxides and metal hydroxides: a comparative study

Zhang

Gao

et al. 2015

J. Chem. Technol. Biotechnol.

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“…4) Several physicochemical and biological processes have been investigated for the removal of dissolved nutrients in water and wastewaters. [5][6][7][8][9] They include adsorption methods, physical processes (settling and filtration), chemical precipitation (with aluminum, iron, and calcium salts), and biological processes that rely on biomass growth (bacteria, algae, and plants) or intracellular bacterial polyphosphate accumulation. 10) Adsorption is one of the most attractive approaches in water treatment, and it has the advantage of having high removal efficiency without producing harmful by-products.…”

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confidence: 99%

Characteristics of Granular Boehmite and Its Ability to Adsorb Phosphate from Aqueous Solution

et al. 2012

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In this study, we investigated the surface properties of granulated boehmite with vinyl acetate (G-BE20) and measured the amount of phosphate it adsorbed and the effect of contact time and solution pH on the adsorption process. The specific surface area (144.9 m 2 /g) and the number of surface hydroxyl groups (0.88 mmol/g) of G-BE20 were smaller than those of virgin boehmite (BE), which gave a specific surface area and number of surface hydroxyl groups of 297.0 m 2 /g and 1.08 mmol/g, respectively. The amount of phosphate adsorbed increased with the temperature. The isotherm model of Langmuir was used to fit experimental adsorption equilibrium data for phosphate adsorption onto G-BE20. The calculated thermodynamic parameters show the spontaneous and endothermic nature of the adsorption process. The equilibrium adsorption onto G-BE20 was reached within 16 h and the amount of phosphate adsorbed was 8.4 mg/g. The kinetic mechanism of phosphate uptake was evaluated with two different models: the Largergren pseudo first-and pseudo second-order models. The data obtained showed a better fit to the pseudo second-order model (0.991) than to the pseudo first-order model (0.967), as indicated by the r values. The rate constants for the adsorption of phosphate onto G-BE20 were calculated as 0.481 1/h and 0.029 g/mg h. The adsorption of phosphate onto G-BE20 was the maximum in the pH range 3.0-4.0. Key words phosphate; adsorption; boehmitePhosphorus is an important nutrient involved in several biochemical reactions, and it cannot be substituted by other elements. It is widely used in agriculture and industry.1) The presence of trace amounts of phosphorus, exceeding about 1 mg/L, in treated wastewater can stimulate algal growth (eutrophication); phosphorus is usually considered a rate-limiting factor for algal growth.2) Algal blooms lead to short-and longterm environmental and aesthetic problems in lakes, coastal areas, and other confined water bodies.3) Moreover, phosphate is an exhaustible resource, and Japan depends solely on imports owing to a lack of native rock phosphate. As a consequence, phosphate removal and recovery from wastewater has been considered an important factor related to environmental sustainability. 4)Several physicochemical and biological processes have been investigated for the removal of dissolved nutrients in water and wastewaters. 5-9) They include adsorption methods, physical processes (settling and filtration), chemical precipitation (with aluminum, iron, and calcium salts), and biological processes that rely on biomass growth (bacteria, algae, and plants) or intracellular bacterial polyphosphate accumulation.10) Adsorption is one of the most attractive approaches in water treatment, and it has the advantage of having high removal efficiency without producing harmful by-products. 11)It is also well known that phosphates have a strong affinity for mineral surfaces.12) Its affinity for hydroxide surfaces depends not only on the anion's complexing capacity, which allows phosphates to bind to surface ...

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“…This technique uses iron particles to adsorb and desorb phosphate in aqueous solutions. Although this technique, with iron particles usually in the form of magnetite (Fe 3 O 4 ), has high efficiency [12][13][14], it also has the following limitations.…”

Section: Page 4 Of 26mentioning

confidence: 99%

“…In particular, the current density, duration, and temperature of electrolytes are reported to be important operational factors in the formation of metal oxide [21]. In aqueous solutions, iron oxide forms according to equations (4) through (12).…”

Section: Anodizationmentioning

confidence: 99%

Phosphate recovery from livestock wastewater using iron oxide nanotubes

Kim

Park

Kim

2016

Chemical Engineering Research and Design

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Adsorption–desorption mechanism of phosphate by immobilized nano-sized magnetite layer: Interface and bulk interactions

Cited by 71 publications

References 16 publications

Different performances and mechanisms of phosphate adsorption onto metal oxides and metal hydroxides: a comparative study

Different performances and mechanisms of phosphate adsorption onto metal oxides and metal hydroxides: a comparative study

Characteristics of Granular Boehmite and Its Ability to Adsorb Phosphate from Aqueous Solution

Phosphate recovery from livestock wastewater using iron oxide nanotubes

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