Removal of phosphate from aqueous solution by thermally treated natural palygorskite

Gan, Fangqun; Zhang, Jianmin; Wang, Huoyan; Du, Changwen; Chen, Xiaoqin

doi:10.1016/j.watres.2009.03.051

Cited by 196 publications

(58 citation statements)

References 31 publications

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“…Similar images were found by studies in developed palygorskite 22 . In Figure 4, one can observe that in all samples the acid treatment did not affect severely the fibrous morphology of palygorskite.…”

Section: Morphological Analysissupporting

confidence: 87%

“…The increased surface area to a maximum value and additional decrease were described in the literature for activation with acid on the palygorskite 21,22 and clays such as: halloysites 23 , and bentonites 24 . The surface area is one of the most important physicochemical properties of palygorskite, especially when it is used as an adsorbent to remove heavy metals and dyes ions.…”

Section: Surface Areamentioning

confidence: 79%

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Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Xavier

Santos

et al. 2014

Mat. Res.

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The palygorskite is an aluminum-magnesium silicate that has a fibrous morphology. Their physicochemical characteristics are the result of high surface area, porosity and thermal resistance which make it an attractive adsorbent. Its adsorption capacity can be increased through chemical reactions and/or heat treatments. The objective of this work is to verify the effects of acid activation on the palygorskite, treated with HCl at 90 °C at concentrations of 2, 4 and 6 mol L -1 in 2 and 4 hours, with clay/acid solution ratio 1 g 10 mL -1 and characterized by techniques: XRF, XRD and surface area. A significant increase in specific surface area was observed in the sample treated with HCl at the concentration 6 mol L -1 . The changes were more pronounced at stricter concentrations of acidity, with decreasing intensity of reflection of the clay indicated in the XRD. These changes were confirmed in the XRF with the leaching of some oxides and with increasing concentration of SiO 2 .

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Section: Morphological Analysissupporting

confidence: 87%

Section: Surface Areamentioning

confidence: 79%

Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Xavier

Santos

et al. 2014

Mat. Res.

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“…Alternatively, thermally-treated palygorskite has also been demonstrated 246 to be an effective P-adsorbent in aquatic systems (e.g. Gan et al, 2009;Yin et al, 2013). 247…”

Section: Expanded/thermally Treated Clay Aggregates 241mentioning

confidence: 99%

Guiding principles for the development and application of solid-phase phosphorus adsorbents for freshwater ecosystems

et al. 2016

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“…To (6) where C t is the phosphate concentration in filtrate over a given period of time (mg P/mL); q e is the adsorbed phosphate amount on the spent adsorbent at the adsorption−desorption equilibrium (mg P/g); V is the volume of NaOH solution (L) and m is the mass of spent adsorbent (g), respectively.…”

Section: Phosphate Adsorption Experimentsmentioning

confidence: 99%

“…In particular, adsorption method has been most widely studied in phosphate removal, due to the high removal efficiency and fast removal rate, as compared with those by utilizing chemical precipitation and biological treatment [2][3][4]. Hence, a variety of adsorbents have been developed and evaluated for phosphate removal, including goethite [5], palygorskite [6], vesuvianite [7], Fe oxide tailing [8], layered double hydroxides [9], calcite [10], zeolite [4,11], pillared montmorillonite [12], red mud [13], fly ash [14], blast furnace slag [15], collagen fiber [16], orange waste [17], etc. Until now, the desire to develop a novel adsorbent which offers high effectiveness and low cost never stops.…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

Huang

Yang

et al. 2013

Microporous and Mesoporous Materials

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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. analysis, FT-IR spectroscopy, and nitrogen adsorption-desorption, were utilized to investigate the effect of functionalization degrees of absorbents on their chemical composition, surface chemistry, pore structures and phosphate adsorption capacities in detail. In the batch adsorption tests, the functionalized absorbents with increasing loadings of diamino groups possessed markedly enhanced adsorption capacities, although there was a gradual loss of ordered mesostructures accompanied. The adsorption isotherms were represented better by using Langmuir model than Freundlich model, which indicated the presence of monolayer adsorption. In particular, for the resulting absorbent prepared with 0.5:1 molar ratio of AAPTS and TEOS, the maximum phosphate capture capacity calculated from Langmuir model is 20.7 mg P/g. In the kinetic study, the phosphate adsorption followed pseudo-second-order equation well with a correlation coefficient of 0.999, suggesting the adsorption process be chemisorption. The phosphate adsorption efficiency of prepared absorbent was highly pH-dependent and the high removal of phosphate was achieved within the pH between 3.0 and 6.0. The presence of Cl − and NO 3 − exhibited small impacts on the phosphate adsorption by using our synthesized absorbent; whereas, there were significantly negative effects from HCO 3 − and SO 4 2− on the phosphate removal. In 0.010 M NaOH, more than 90% of the absorbed phosphate anions on the spent adsorbent could be desorbed, suggesting the absorbent with a capacity of regeneration.

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Removal of phosphate from aqueous solution by thermally treated natural palygorskite

Cited by 196 publications

References 31 publications

Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Guiding principles for the development and application of solid-phase phosphorus adsorbents for freshwater ecosystems

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

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