Non-acidic synthesis of phosphatized dolomite and its sorption behaviour towards Pb <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si18.gif" display="inline" overflow="scroll"><mml:msup><mml:mrow/><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>, Zn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si18.gif" display="inline" overflow="scroll"><mml:msup><mml:mrow/><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>, C

Иванец, А. И.; Китикова, Н. В.; Шашкова, И. Л.; Matrunchik, Yu. V.; Kul’bitskaya, L. V.; Sillanpää, Mika

doi:10.1016/j.eti.2016.09.001

Cited by 17 publications

(3 citation statements)

References 28 publications

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“…Since adsorption is not a destructive technique, some materials release the nutrient after the treatment, thus attending the demands of a circular economy (Kasprzyk and Gajewska, 2019). Recent research has proposed a variety of adsorbents including layered chalcogenide (Li et al, 2019), nano-porous calcined palygorskite embedded with La(OH) 3 (Kong et al, 2018), acid-activated akadama clay (a Japanese volcanic soil) (Wang et al, 2018), magnetically recoverable magnetite/lanthanum hydroxide (Fang et al, 2018), hydrothermally synthesized lanthanum carbonate nanorods (Koh et al, 2020), thermally activated dolomite (Ivanets et al, 2015(Ivanets et al, , 2016, zirconium/magnesium modified bentonite (Lin et al, 2020), etc. Clay minerals have gained interest because they are abundant in nature and are environmentally compatible. Montmorillonites, like other smectites, have permanent negative charges generated by the isomorphic substitutions of Si 4þ by Al 3þ in the tetrahedral sheets, and of Al 3þ by Mg 2þ in the octahedrons.…”

Section: Introductionmentioning

confidence: 99%

Fe(III)-polyhydroxy cations supported onto K10 montmorillonite for removal of phosphate from waters

Leite

Nascimento

Masini

2020

Heliyon

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Since phosphate is strongly related to eutrophication of environmental waters, several research groups quest for materials that can efficiently remove phosphate from wastewaters before it contaminates lakes and reservoirs. In the present work, a commercial clay mineral (K10 montmorillonite) modified with Fe 3þ polyhydroxy cations was investigated as an adsorbent for phosphate. The incorporation of the polycations did not alter the main conformational characteristics of the montmorillonite, as verified by specific surface area measurements, X-ray diffractometry, FTIR, electron microscopy, and zeta potential titrations. On the other hand, the materials supporting Fe 3þ polyhydroxy cations exhibited a significant enhancement of adsorption capacity, as determined by Langmuir-Freundlich isotherms, from 39 AE 2 to 104 AE 15 μmol g À1 . The different ratios of OH À to Fe 3þ did not affect the adsorption capacities. The adsorption kinetics was best described by the pseudo 2 nd order model, approaching the equilibrium after 120 min of contact time. A variation of pH between 4.6 and 8.5 did not affect the adsorption percentages. The adsorption capacities increased with the increase of the ionic strength, thus suggesting that the formation of inner-sphere complexes prevails over electrostatic interactions as the adsorption mechanism. The materials removed phosphate from three polluted water samples having phosphate concentrations between 0.0919 and 1.211 mg L À1 . The remaining phosphate concentration was below the limit of quantification of the analytical method (0.063 mg L À1 in P, or 2.0 μmol L À1 ). The presence of 10 mg L À1 humic of fulvic acid did not affect the performance of the materials. In conclusion, the modification of clay minerals with Fe 3þ polyhydroxy cations is useful in producing low-cost adsorbents for phosphate.

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Section: Introductionmentioning

confidence: 99%

Fe(III)-polyhydroxy cations supported onto K10 montmorillonite for removal of phosphate from waters

Leite

Nascimento

Masini

2020

Heliyon

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“…The effects of the properties of the reagents, contact time, the phase, and chemical composition of the obtained sorbents on adsorption properties were investigated. Up to 90-95% of Pb 2+ , Zn 2+ , Cu 2+ , Cd 2+ , Ni 2+ , Sr 2+ and Co 2+ were removed in dynamic mode from multicomponent aqueous solutions (at initial concentrations of 5 mg/L, linear velocity 10 m/h) (Ivanets et al, 2016). https://doi.org/10.17159/wsa/2022.v48.i3.3933…”

Section: Introductionmentioning

confidence: 99%

Comparison of classic and chemometric methods used for phosphate removal from fresh human urine under optimum conditions

Öztekin

Çolak

İnan

2022

WSA

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Human urine constitutes 1% of domestic wastewater and can be used to recover nitrogen and phosphorus when collected separately at source. Sustainable nutrient (nitrogen, phosphate, potassium) cycling requires the recovery of these valuable resources from human urine. As nitrogen and phosphorus are valuable nutrients needed for plant growth, these components of urine are an excellent fertilizer. Phosphorus can be applied in natural fertilizers and in addition the pollution load of wastewater treatment plants is reduced. Different nutrient removal and recovery methods from urine have been studied at lab scale, but none so far has reached technological competence and none has been extended to practical use. The focus of this study was to evaluate electrocoagulation as a process for the removal of phosphate from fresh human urine using iron plate electrodes. The effect of pH and current density on phosphate removal was investigated. While determining the optimum conditions for removal, classical and chemometric methods were compared. Using the central composite design (CCD), optimum conditions were determined with only 13 experiments, and time and labour savings were achieved compared to the classical method. Initial pH values and current density were controlled within the range of pH 5–9 and current density 12-40 mA/cm2. From the obtained results, it was found that optimal initial current density is 40 mA/cm2 for both methods, and optimal pH is 7 for the classical method and 6.24 for CCD, which is the natural pH of human urine. Realization of phosphate removal using optimum conditions discovered with CCD, provides savings on experimental effort, time, chemicals and energy consumption, and will contribute to resource recovery, reduction of wastewater load and sustainable fertilizer production.

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“…Solid calcite, as one of the fifth most abundant biominerals in the Earth crust, has a very low cost and wide availability. However, to the best of our knowledge, there is a lack of studies from such a standpoint and only an attempt has been made to synthesize phosphatized dolomite as sorbent to be used for the treatment of metal-contaminated water [33].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite Coatings on Calcite Powder for the Removal of Heavy Metals from Contaminated Water

Gibert

Valderrama

Martínez

et al. 2021

Water

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An approach for the remediation of heavy metal-contaminated wastewater that is gaining increasing attention is the application of hydroxyapatite (HAP)-based particles. HAP is conventionally synthesized through wet chemical precipitation of calcium and phosphate ions, although later studies have focused on HAP synthesis from solid calcite contacted with a phosphate solution under ambient conditions. This synthesis route can allow saving soluble Ca-chemicals and, thus, make the process more cost-efficient. The aim of this study was to coat natural calcite powder with a layer of HAP for the removal of Zn and Cu from contaminated water. For this purpose, a HAP layer was synthesized on calcite particles, characterized using several complementary techniques and evaluated for the removal of Zn and Cu from synthetic solutions. Sorption kinetics and equilibrium isotherms, as well as the effect of sonication of the synthesized sample on its sorption performance, were determined. The results showed that calcite particles were efficiently coated with a HAP layer with high capacity in removing Zn and Cu from acidic solutions, with a qmax of 34.97 mg/g for Zn (increased to 37.88 g/mg after sonication of the sample) and 60.24 mg/g for Cu (which hardly varied with sonication). The mechanisms behind the sorption of Zn and Cu onto HAP, inferred from pH changes, the relation between metal uptake and Ca2+ release and XRD analysis, included surface complexation, ion exchange and precipitation of new Zn- and Cu-containing phases.

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Non-acidic synthesis of phosphatized dolomite and its sorption behaviour towards Pb 2+, Zn2+, C

Cited by 17 publications

References 28 publications

Fe(III)-polyhydroxy cations supported onto K10 montmorillonite for removal of phosphate from waters

Fe(III)-polyhydroxy cations supported onto K10 montmorillonite for removal of phosphate from waters

Comparison of classic and chemometric methods used for phosphate removal from fresh human urine under optimum conditions

Hydroxyapatite Coatings on Calcite Powder for the Removal of Heavy Metals from Contaminated Water

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