Research on the characteristics of red mud granular adsorbents (RMGA) for phosphate removal

Yue, Qinyan; Zhao, Yaqin; Li, Qian; Li, Wenhong; Han, Seonggyun; Qi, Yuanfeng; Yu, Hui

doi:10.1016/j.jhazmat.2009.11.098

Cited by 90 publications

(48 citation statements)

References 26 publications

(33 reference statements)

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“…The original EV was simply treated before use [24]. Firstly, after being screened through a 325 mesh (44 µm), EV was mixed and stirred with deionised (DI) water for 4 h to remove soluble salts.…”

Section: Preparation Of La(oh) 3 -Modified Evmentioning

confidence: 99%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

265

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract:La(OH) 3 -modified exfoliated vermiculites were fabricated, characterized, and investigated for phosphate removal in batch tests for the first time. The BET surface area of the La 5 EV adsorbent, which was synthesized in the solution consisting of 5.00 mmol/g La/exfoliated vermiculite (EV), was significantly increased, accompanied with a larger pore diameter and greater total pore volume, as compared with the unmodified EV. The phosphate adsorption capacity of La 5 EV was approximately one order of magnitude higher than that of EV. Effects of initial phosphate concentration, contact time, temperature, pH, and 2 co-existing ions on the adsorption capacity of La 5 EV were investigated in detail. The experimental equilibrium data were fitted better by using the Langmuir model (maximum adsorption capacity of 79.6 mg P/g) than the Dubinin-Radushkevich or the Freundlich model, suggesting that the adsorption feature be monolayer. Meanwhile, the phosphate adsorption kinetics could be well described by the pseudo-second-order model, and the adsorption process might be controlled by boundary layer (film) diffusion. ∆G°, ∆H° and ∆S° were also determined, in which it was found that the phosphate adsorption , and SO 4 2-had neglectable effects on its phosphate removal capacities. In the synthetic secondary treated wastewater with a low phosphate concentration of 2 mg P/L, 97.9 % of its final adsorption capacity reached in the first 10 min and the phosphate concentration dramatically decreased below 50 µ g P/L. The spent La 5 EV could be regenerated and reused in phosphate adsorption; that could remove more than 70 % phosphate in the 3 rd adsorption-desorption cycle.

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Section: Preparation Of La(oh) 3 -Modified Evmentioning

confidence: 99%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

265

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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.…”

mentioning

confidence: 99%

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

Ogata

Tominaga

Kangawa

et al. 2012

CHEMICAL & PHARMACEUTICAL BULLETIN

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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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“…Different types of low-cost, high-capacity materials have long been used to remove phosphate, such as granulated coal ash (Asaoka and Yamamoto, 2010), red mud Zhao et al, 2009;Yue et al, 2010) and lanthanum-doped vesuvianite (Li et al, 2009). Researchers have investigated ferric manganese oxide as an adsorbent for phosphate and arsenic removal .…”

Section: Phosphate Removal Using Novel Combinedmentioning

confidence: 99%

Phosphate removal using novel combined Fe-Mn-Si oxide adsorbent

Maeng¹,

Lee²,

Dockko³

2013

Journal of Korean Society of Water and Wastewater

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:The removal of phosphate from surface water is becoming increasingly vital to prevent problems such as eutrophication, particularly near urban areas. Recent requirements to reduce high concentrations of phosphate rely on physicochemical methods and adsorbents that must be effective even under strict conditions. The phosphate removal efficiencies of two adsorbents, Fe-Mn-Si oxide and Fe-Mn oxide, were investigated and the data used to compare kinetics and isotherm models. The maximum adsorption capacities of the two adsorbents were 47.8 and 35.5 mg-PO 4 3-/g, respectively. Adsorptions in both cases were highly pH dependent; i.e., when the pH increased from 3 to 9, the average adsorption capacities of the two adsorbents

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Research on the characteristics of red mud granular adsorbents (RMGA) for phosphate removal

Cited by 90 publications

References 26 publications

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

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

Phosphate removal using novel combined Fe-Mn-Si oxide adsorbent

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