Removal of arsenious ion by calcined aluminum oxyhydroxide (boehmite)

Ogata, Fumihiko; Kawasaki, Naohito; Nakamura, Takeo; Tanada, Seiki

doi:10.1016/j.jcis.2006.03.026

Cited by 38 publications

(32 citation statements)

References 17 publications

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“…2),12)- 19) Research on the removal of aqueous phosphate has been roughly divided into three groups: (1) mechanistic studies using typical experiments;…”

Section: Introductionmentioning

confidence: 99%

“…19), 20) In Japan, various harmful anions in wastewater such as nitrate, nitrite and fluoride, as well as phosphate are regulated by Water Pollution Control Law (Law number 138 of 1970) proclaimed by the Ministry of the Environment, Government of Japan. It should be noted that the regulated value for aqueous fluoride was revised in 2007 from 15-50 mg/L to 8 mg/L, indicating that candidate removal reagent should be examined as soon as possible for their ability to remove aqueous fluoride.…”

Section: Introductionmentioning

confidence: 99%

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Effects of several harmful anions on the removal of aqueous phosphate by boehmite

Sugiyama

Inaba

Manabe

et al. 2008

J. Ceram. Soc. Japan

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Boehmite (Al(OH)O) was employed for the removal of aqueous phosphate in the presence of harmful anions such as carbonate, sulphate, nitrate, nitrite, chloride and fluoride at 298 K. Although boehmite was shown to remove a certain simultaneous removal of phosphate together with fluoride, no influence of the presence of carbonate, sulphate, nitrate, nitrite and chloride on the removal of phosphate by boehmite was observed. In the present study, two kinds of boehmite, a commercially available form and boehmite prepared using a sol-gel technique, were employed for the simultaneous removal of phosphate and fluoride, and it was found that the latter form was superior for such removal. Solid-state 31 P MAS NMR analyses revealed that, in the presence of fluoride, phosphate was removed onto boehmite as different types of phosphate species, depending on the solution pH and the source of boehmite.

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“…2),12)- 19) Research on the removal of aqueous phosphate has been roughly divided into three groups: (1) mechanistic studies using typical experiments;…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of several harmful anions on the removal of aqueous phosphate by boehmite

Sugiyama

Inaba

Manabe

et al. 2008

J. Ceram. Soc. Japan

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“…It also possesses anion exchange ability due to the surface hydroxyl groups. 14) BE, the molecular formula of (AlOOH) n , is colorless, insoluble in water, and exhibits acid, base, and thermal resistance, which makes it useful as a catalyst, an abrasive, or a filler. However, powdered BE needs to be granulated with a binder for use in fields; it is not useful for removal of phosphate because plugging occurs, which indicates that the particle size of the BE adsorbent is too small.…”

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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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“…We previously reported that aluminum compounds (powder adsorbent, granulated aluminum compound with organic or inorganic binders) exhibited the ability to adsorb phosphate from aqueous solution systems (Ogata et al, 2006;Kawasaki et al, 2010;Ogata et al, 2010;Ogata et al, 2011). However, a granulation method without a binder had not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

Granulation of Boehmite without a Binder and its Capacity for Phosphate Adsorption in Aqueous Solution

Ogata

Tominaga

Iwata

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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In this study, GA (granulated aluminum oxyhydroxide) was prepared from aluminum oxyhydroxide without a binder, and its phosphate adsorption capacity was investigated. Scanning electron microscopy images, specific surface area, pore volume, mean pore diameter, and solution pH of GA were analyzed. The amount of phosphate adsorbed was studied using batch techniques, and was shown to increase at higher temperatures. Moreover, adsorption isotherms were fitted to both the Freundlich equation (correlation coefficient: 0.866 -0.972) and the Langmuir equation (correlation coefficient: 0.993 -0.999). Adsorption equilibrium was reached within 24 h. The kinetic data for adsorption was best described by a pseudo-first-order rate equation. A pH of about 3 was the most suitable for phosphate adsorption. Moreover, the adsorption mechanism of phosphate onto GA could be related to the specific surface area and surface hydroxyl groups on GA. Both adsorption and desorption could be performed on GA using NaOH at different concentrations. These results suggest that the GA prepared in this work is appropriate for practical applications.

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Removal of arsenious ion by calcined aluminum oxyhydroxide (boehmite)

Cited by 38 publications

References 17 publications

Effects of several harmful anions on the removal of aqueous phosphate by boehmite

Effects of several harmful anions on the removal of aqueous phosphate by boehmite

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

Granulation of Boehmite without a Binder and its Capacity for Phosphate Adsorption in Aqueous Solution

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