Phosphate removal from aqueous solutions using kaolinite obtained from Linthipe, Malawi

Kamiyango, M.W.; Masamba, W.R.L.; Sajidu, S.M.I.; Fabiano, E.

doi:10.1016/j.pce.2009.07.012

Cited by 42 publications

(30 citation statements)

References 30 publications

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“…Specifically, the adsorption of phosphate occurs in pH 3.0-5.0 (Kamiyango et al 2009) Malawi, has revealed high phosphate levels ranging from 0.63 to 5.50 mg/L. These phosphate levels would stimulate excessive growth of plants and toxic cyanobacteria in stagnant receiving water bodies hence posing a threat to aquatic life and water quality.…”

Section: Reactivity Of the Kaolinite (Cui And Weng 2013)mentioning

confidence: 99%

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

Silva

Lages

Santana

2017

An. Acad. Bras. Ciênc.

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This study covers the evaluation of the structure and the capacity in adsorbing orthophosphate ions of kaolinites collected from sampling sites in Manaus (Brazil). The kaolinites were obtained using physical fractioning (sieving/siphoning) techniques and chemical treatment with HCl, H 2 SO 4 , H 2 O 2 and KCl. The investigation of the kaolinite lattices involved the Hinckley and Plançon indexes determined from X-ray diffraction data, Fourier transformed infrared spectroscopy, scanning electron microscopy and Mössbauer spectroscopy. The absorption capacity of orthophosphate ions was calculated by Freundlich and Langergren isotherms. A transitional state was observed in the crystallographic structure from kaolinites because of the isomorphic substitution of Al 3+ by Fe 3+. This isomorphic substitution occurs accompanied by the optical pleochroism behavior, but it also reduces the mean particle sizes and increases the number of structural defects and magnetic properties of these kaolinites. Mössbauer spectroscopy showed that the substituting Fe 3+ preferentially occupies octahedral sites. In the kaolinite lattices there are different octahedral sites of

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Section: Reactivity Of the Kaolinite (Cui And Weng 2013)mentioning

confidence: 99%

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

Silva

Lages

Santana

2017

An. Acad. Bras. Ciênc.

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“…Also, loess has been studied on removal of total phosphorous or phosphate from municipal wastewater, including natural adsorbents such as calcite, alunite, wollastonite, dolomite and kaolinite. [10][11][12][13][14][15] The major components of loess are composed of alumina oxide, silica oxide, iron oxide, calcium oxide and residual carbon. However, the constituents of loess vary in different localities.…”

Section: -6mentioning

confidence: 99%

Evaluation of Loess Capability for Adsorption of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution

Kim¹,

Ryoo

Hong³

et al. 2014

Bulletin of the Korean Chemical Society

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The aim of the present study is to explore the possibility of utilizing loess for the adsorption of total phosphorous (T-P) and total nitrogen (T-N) in water. Batch adsorption studies were performed to evaluate the influences of various factors like initial concentration, contact time and temperature on the adsorption of T-P and T-N. The adsorption data showed that loess is not effective for the adsorption of T-N. However, loess exhibited much higher adsorption capacity for T-P. At concentration of 1.0 mg L, approximately 97% of T-P adsorption was achieved by loess. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher R 2 compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium q e,cal from pseudo-second-order kinetic model was relatively similar to the experimental adsorption equilibrium q e,exp . The thermodynamic parameters such as free energy ΔG, the enthalpy ΔH and the entropy ΔS were also calculated.

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“…Phosphate has been cited as a vital and limiting nutrient in freshwater system and has been suggested that a decrease in phosphate can effectively control eutrophication in coastal and fresh water systems [2,6,7]. Phosphates in wastewater may originate from industrial use of phosphate as a raw material, domestic use of phosphate-containing detergents and runoff from application of phosphate fertilizers to agricultural lands [8]. As eutrophication is a major issue, the effective and efficient removal of phosphate during wastewater treatment is crucial.…”

Section: Introductionmentioning

confidence: 99%

“…Fe, Al and Ca are the elements that are often credited with phosphate sorption and it is assumed that if these elements are present in any medium in a substantial amount, then that medium can be used for phosphate removal [21]. Several studies have been conducted using various low cost adsorbents such as: alunite [22,23], fly ash [24,25], opoka [26,27,28], Polonite [29], sand [30,31], Lightweight aggregate (LWA)/Light Expanded Clay aggregate (LECA) [32,33,34], ochre [35], red mud [36], and clay [8,37] for the removal of phosphate from wastewater. The studies have been carried out in a laboratory, small scale constructed wetland or a full scale constructed wetland with the adsorbents used as filter media [30].…”

Section: Introductionmentioning

confidence: 99%

“…Clay has been studied as a low cost adsorbent in the removal of phosphate from wastewater and different phosphate removal rates has been recorded. In a phosphate removal studies done with raw and acid treated clay from Malawi, a high brick dosage of 60g/L was required for a removal rate of 80% using the acid treated clay while the raw clay only achieved a maximum removal rate of 60% and was believed that different phosphate removal mechanisms were responsible for phosphate removal at different pH [8]. At a low pH, it was believed that the removal was through phosphate adsorption to iron oxide, while the phosphates were precipitated out by calcium ions at a higher pH [8].…”

Section: Introductionmentioning

confidence: 99%

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The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

Wood¹,

Augustine²,

Mark³

et al. 2016

Fourth International Conference on Advances in Bio-Informatics, Bio-Technology and Environmental Engineering - ABBE 2016

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Abstract-Removal of phosphate in wastewater treatment is crucial to reducing nutrient enrichment and eutrophication of aquatic bodies. This study explored the potential of fired clay pellets for use in phosphate removal during wastewater treatment. The mechanism of removal was evaluated in a batch adsorption study under different experimental conditions. Fired clay pellets were found to be effective in the adsorptive removal of phosphate from aqueous solution with a maximum adsorption capacity of 144mg/g. The experimental data showed a good fit to the pseudo-first-order kinetic model indicating a physical nature of the sorption process and also followed Dubinin-Radushkeivich Isotherm model. Adsorption of phosphate favoured acidic pH with optimum removal at pH 3-4. The values of Gibbs free energy (-16.5 kJ/mol), enthalpy (-8.87 kJ/mol) indicated adsorption was spontaneous and exothermic. The mechanism was found to be predominantly physisorption supported by some diffusion.

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Phosphate removal from aqueous solutions using kaolinite obtained from Linthipe, Malawi

Cited by 42 publications

References 30 publications

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

Evaluation of Loess Capability for Adsorption of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution

The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

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