Sorption mechanism(s) of orthophosphate onto Ca(OH)<sub>2</sub>pretreated bentonite

Μάρκου, Γιώργος; Inglezakis, Vassilis J.; Mitrogiannis, Dimitris; Efthimiopoulos, Ilias; Psychoyou, Maria; Koutsovitis, Petros; Muylaert, Koenraad; Baziotis, Ioannis

doi:10.1039/c5ra27638a

Cited by 17 publications

(23 citation statements)

References 48 publications

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“…The CaT‐B at low magnification displays a surface similar to untreated, however, at high magnification euhedral to subhedral Ca‐rich crystals (Supporting Information Figure S1b) were observed, indicating a hydrated layer on the CaT‐B surface (after reaction of bentonite with Ca(OH) 2 ). The difference from an earlier work on similar material, is that in the current study the surface was not homogeneously covered by a thin film but instead comprised by tiny <5 μm crystals. Furthermore, in the previous study a tobermorite‐rich thin layer composed by a hydrated mixture of Ca‐Al‐S covering the bentonite was observed.…”

Section: Resultscontrasting

confidence: 73%

“…However, sorption mechanisms and capacities differ significantly in complex solutions, such as WW, due to the existence of other ions in the solution. As was shown by Markou et al, when Ca 2+ was present in the solution, surface precipitation of Ca 2+ with

{P O}_{4}^{3 -}

occur contributing also in OPP removal. The majority of the studies dealing with OPP sorption experiments have been conducted using pure OPP aqueous solutions.…”

Section: Introductionmentioning

confidence: 65%

“…The dried bentonite was sieved and particles with a size of 4–6 mm were used for the experiments. The material has been characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), and infrared‐attenuated total reflectance (IR‐ATR) techniques (see sections 2.4.2, 2.4.3, and 2.4.4) and the results were compared with the respective data given in a previous work . The chemical pre‐treatment was performed by adding 100 g L −1 bentonite to 1 M Ca(OH) 2 and shaken at room temperature overnight.…”

Section: Methodsmentioning

confidence: 99%

“…In particular, for bentonite the low P sorption affinity is mainly attributed to the negative charged surface and lattice, which prevents the sorption and ion exchange of anions . Therefore, sorbent surface modification to improve its OPP sorption affinity is required …”

Section: Introductionmentioning

confidence: 99%

“…In a previous study, Ca(OH) 2 was used as a modification agent, resulting in a significant increase of OPP uptake by bentonite from about 0.3 mg P g −1 (untreated) to about 8 mg P g −1 (pretreated bentonite) at pH 7, 25 °C, and initial concentration of OPP 100 mg P l −1 . It was concluded that the main sorption mechanism involved in OPP sorption by the pre‐treated bentonite is inner‐sphere complexation (ligand exchange), that is, the exchange of OH − and/or

{C O}_{3}^{2 -}

anions which were bonded with Ca 2+ by OPP.…”

Section: Introductionmentioning

confidence: 99%

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Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Μάρκου

Mitrogiannis

Inglezakis

et al. 2018

CLEAN Soil Air Water

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The performance of chemically pre‐treated bentonite with Ca(OH)2 toward ortho‐phosphate phosphorus (OPP) removal efficiency in synthetic (inorganic) and real (anaerobically digested effluents) wastewater (WW) is evaluated. The Ca(OH)2 pre‐treated bentonite displays a significant increase of OPP uptake (qe; mg P g−1 bentonite) of 40 and 15 times, reaching about 14 and 5.5 mg P g−1 for synthetic and real WW, respectively. The optimum pH for OPP sorption is 7, while at higher pH values, although OPP removal is high due to the precipitation in the liquid phase, the OPP removal in solid phase, that is, sorption onto bentonite surface is less compared to pH 7. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) analysis shows that OPP forms various complexes with co‐existing ions in WW, such as apatite (with Ca2+) and struvite (with NH4+ and Mg2+). The most influential parameter of the pre‐treatment is the dosage of Ca(OH)2. Concentration of 0.5 M Ca(OH)2 or higher is necessary for an efficient pre‐treatment. In contrast, the concentration of bentonite does not affect the pre‐treatment efficiency, and a mass of 500 g L−1 bentonite is found to be sufficient. The chemical pre‐treatment with Ca(OH)2 renders bentonite a promising low‐cost sorbent for OPP removal and recovery from WW.

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Section: Resultscontrasting

confidence: 73%

{P O}_{4}^{3 -}

occur contributing also in OPP removal. The majority of the studies dealing with OPP sorption experiments have been conducted using pure OPP aqueous solutions.…”

Section: Introductionmentioning

confidence: 65%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

{C O}_{3}^{2 -}

anions which were bonded with Ca 2+ by OPP.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Μάρκου

Mitrogiannis

Inglezakis

et al. 2018

CLEAN Soil Air Water

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Characterization and recovery of phosphorus from wastewater by combined technologies

Carrillo

Fuentes

Gómez

et al. 2020

Rev Environ Sci Biotechnol

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Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

et al. 2020

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In this work, the water quality status of the surface water that lies around the Karamana River basin, Trivandrum urban area, was studied on the basis of the water quality index (WQI) method. The eutrophic condition of the basin is revealed, and proper mitigation strategy was adopted for the removal of phosphate species using pillared clay materials. Proper sampling was carried out in the urban rivers, and various physico-chemical parameters for evaluating the quality of water were analysed. WQI values obtained for these riverine systems are in the range 317.7-3005.1, indicating that the water is not suitable without treatment for any domestic activities. Also, phosphate ions in the range 1.98-20.52 mg/L reflect the dominance of phosphate species in surface water. A proper mitigation strategy was adopted for the selective removal of phosphate ions using adsorption technique by using zirconium-pillared bentonite clay (ZPBC) prepared by the stirring-ageing technique. The batch adsorption experiment performed on simulated phosphate solution shows that for 2.0 g/L of ZPBC a maximum phosphate adsorption capacity of 35.71 mg/g was achieved in 30 min at pH 3.0. The data obtained were used to study models in kinetics and isotherm. The reusability of spent ZPBC for five continuous cycles without major loss in adsorption capacity using 0.025 M Na 2 CO 3 extractant was proved from the desorption study. A single-stage reactor was also designed from the isotherm data and proved to be effective. The applicability of the adsorbent towards phosphate anions was successfully checked in the laboratory using surface water collected and found that the complete removal of phosphate was achieved using 6.0, 8.0 and 10.0 g/L of ZPBC.Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s4245 2-020-2571-0) contains supplementary material, which is available to authorized users.

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Sorption mechanism(s) of orthophosphate onto Ca(OH)₂pretreated bentonite

Abstract: Bentonite was chemically pretreated with Ca(OH)2to enhance orthophosphate phosphorus (OPP) sorption capacity (qe).

Cited by 17 publications

References 48 publications

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Characterization and recovery of phosphorus from wastewater by combined technologies

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

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Sorption mechanism(s) of orthophosphate onto Ca(OH)2pretreated bentonite

Abstract: Bentonite was chemically pretreated with Ca(OH)2to enhance orthophosphate phosphorus (OPP) sorption capacity (qe).

Cited by 17 publications

References 48 publications

Ca(OH)2 Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Ca(OH)2 Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Characterization and recovery of phosphorus from wastewater by combined technologies

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

Contact Info

Product

Resources

About

Sorption mechanism(s) of orthophosphate onto Ca(OH)₂pretreated bentonite

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater