Remediation of polluted soils by utilizing hydrothermally treated calcareous fly ashes

Protonotarios, V.

doi:10.1016/s1672-2515(07)60236-x

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…zeolites) [13][14][15][16]. Therefore, NaOH solutions present higher conversion efficiency than the respective KOH under the same temperature, as it is also concluded from the vast body [3][4][5][6][7][8][10][11][12] of previous research studies.…”

Section: Resultsmentioning

confidence: 98%

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Removal of heavy metals from wastewater using CFB-coal fly ash zeolitic materials

Koukouzas

Vasilatos

Itskos

et al. 2010

Journal of Hazardous Materials

128

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Section: Resultsmentioning

confidence: 98%

“…face area and long detention periods as well as high capital cost, usually not-affordable for small-scale industries. Thus, the costeffective disposal of heavy metal-containing wastewater remains a challenging task for industrialists and environmentalists [8,9].…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals from wastewater using CFB-coal fly ash zeolitic materials

Koukouzas

Vasilatos

Itskos

et al. 2010

Journal of Hazardous Materials

128

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“…As long as the NaOH solution penetrates the cenospheres, allows the escape of the trapped air and thus increasing the SG [12]. Nevertheless, as the zeolitization process evolves, the subsequent crystallization of the experimental products yields to a larger pore volume, thus the SG decreases.…”

Section: Hydroxy-sodalite +mentioning

confidence: 99%

“…Ιntensive industrial activity has resulted in the accumulation of high concentrations of heavy metals and toxic elements in the environment, causing health, ecological and socio-economic problems [11]. New technologies in the area of environmental relief from metal pollution include the utilization of industrial by-products (fly ashes and slag) presenting high adsorption capacity with respect to metals [12] resulting to environmental and economical, benefits.…”

Section: Introductionmentioning

confidence: 99%

Production of synthetic zeolites from lignite - calcareous Greek fly ashes and their potential for metals and metalloids retention

Protonotarios¹

2006

WIT Transactions on Ecology and the Environment, Vol 92

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The current state of the art focuses on the production of synthetic zeolites from lignite -calcareous fly ashes. The synthetic minerals are produced by the hydrothermal treatment of Greek fly ashes originating from Ptolemais and Megalopolis Power Plants in Greece. The products are examined in terms of their mineralogical composition, for the formation of known zeolites, morphology, thermal behavior, cation exchange capacity, pH, porosity and specific surface area. Zeolitic products, along with untreated fly ash, are investigated for their potential of retaining heavy metals from liquid wastes. The mechanisms of metal retention by zeolites in artificial solutions including lead, zinc, copper, arsenic and cadmium were examined. Solutions including the same pollutants, mobilized from a contaminated soil, utilizing selected solvents were produced. Results revealed the capability of zeolitic materials and fly ashes to retain metals in significant concentrations. Furthermore, a number of different retention mechanisms are developed, including ion exchange, surface adsorption and precipitation of metals.

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“…Research efforts focus on the addition of FA in construction materials including conventional cement-based products as well into clayey mixtures at different combinations and proportions for manufacturing ceramic, glass-ceramic and geopolymeric materials, due to FAs interesting physicochemical properties [11][12][13][14][15][16][17][18]. Moreover, the utilization of FA to act as synthetic zeolite for remediation of soils contaminated by heavy metals is reported in other study [19]. Also, FA has been successfully tested as a low-cost adsorbent to remove Cu and Cd ions from aqueous solutions [20].…”

Section: Introductionmentioning

confidence: 99%

Transformation of Industrial By-Products into Composite Photocatalytic Materials

Katsika

Volioti

Karayannis

2019

Period. Polytech. Chem. Eng.

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The transformation of both calcareous and siliceous Greek power station by-products (lignite ashes) into novel composite materials with photocatalytic properties for environmental application was investigated. Particularly, a comparison between the development of coated ceramic substrates and the modification of ash surfaces is attempted. Specifically, a) the sintering process (1000 °C, 2 h) of both fly and bottom ash (either calcareous or siliceous) for their conversion into compacted ceramic substrates coated with TiO2 slurry and then further thermally treated (500 °C, 1 h) to acquire TiO2 film consistency onto the ceramic substrate and b) the process of TiO2 precipitation on lignite ash surfaces in acidic solution after neutralization, and estimation of the TiO2 percentage, are compared. The microstructures obtained were examined by XRD and SEM-EDX analysis. Vickers microhardness was also determined for the ceramic microstructures, with satisfactory results (up to 356HV). The energy gap measurements of the coatings were found to be between 3.02eV and 3.17eV, which is located between the energy gap of anatase (3.23eV) and rutile (3.02eV). The coating mass was about 0.059 g/cm2. The photocatalytic activity under visible and UV irradiation was investigated in aqueous solutions of methylene blue and methyl orange organic dyes, with encouraging results. A main advantage of the processes proposed is the immobilization of TiO2 onto largely available secondary resources, which can lead to production of value-added ‘green’ photocatalysts for the treatment of industrial effluents in the framework of circular economy.

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Remediation of polluted soils by utilizing hydrothermally treated calcareous fly ashes

Cited by 7 publications

References 9 publications

Removal of heavy metals from wastewater using CFB-coal fly ash zeolitic materials

Removal of heavy metals from wastewater using CFB-coal fly ash zeolitic materials

Production of synthetic zeolites from lignite - calcareous Greek fly ashes and their potential for metals and metalloids retention

Transformation of Industrial By-Products into Composite Photocatalytic Materials

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