New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals

Noli, F.; Buema, Gabriela; Μisaelides, P.; Harja, Maria

doi:10.1007/s10967-014-3762-1

Cited by 16 publications

(30 citation statements)

References 44 publications

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“…The chemical composition of lime, in oxide components is presented in Table 2. The ash, used in this study, has the oxidic components presented in Table 2 (Harja, 2010(Harja, , 2015(Harja, , 20132010;2012a&b). FTIR spectra are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorbents were analyzed; FTIR spectra of LA2 and LA4 are presented. In the case of LA4 and LA6 it can observed peaks, corresponding to zeolitic/geopolimeric materials (Harja 2016;Harja 2009a;Noli 2015). SEM analysis was done for all samples, for selected samples: LA2, LA4 and LA6 are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Treatment processes of Pb(II) removal from wastewater through adsorption on different low cost adsorbents were recently studied (Adebisi 2017;Arbabi, 2015;Nascimento 2009, Buema 2013Harja 2013). Several natural or synthetic materials, such as natural/synthetic zeolites (Kotova 2017), fly ash (Harja 2016;Noli 2015), clays, carbonates, phosphate rocks, alkaline agents, carbon (Adebisi 2017), hydroxyapatite, etc. (Zarghami 2015) have been recently tested as to their ability to immobilize metals.…”

Section: Introductionmentioning

confidence: 99%

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New Adsorbent Materials on the Base of Ash and Lime for Lead Removal

Harja¹,

Kotova²,

Ciobanu³

et al. 2017

Simi 2017

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The development of new materials, with imposing properties -for environmental protection, represents a challenge for contemporary society. In this paper, we propose obtaining of new adsorbent materials from thermo plant ash and lime. The use of ash presents the advantage, because this waste is in great quantities, and it is a way for its capitalization. The new materials offer new scientific and technological perspectives due to the specific interesting physical properties of these materials. The utilization of adsorbents based on ash/lime, for waste water depletion, represents an alternative with ecological and economic implications. The authors present in this study the results of experimental researches on the adsorbents prepared in the laboratory using fly ash produced at CET Holboca Iasi and lime from Bicaz. The experimental conditions of obtaining new adsorbents were established and the characterization of synthesized materials was realized. Raw and synthesized materials were characterized by: SEM/EDAX (Quanta 3D -AL99/D8229), XRD (X'Pert PRO MRD X-ray diffractometer), BET (Quanta-chrome Instruments) and FT-IR analysis (DIGILAB FTS 2000). Experimental results demonstrated that the new materials can be successfully used for removal of lead from waste water. The removal rate was over 97%, after 60 minutes, and adsorption capacities were obtained of 21.25 mg/g. The resulted product is easy to separate and can be used as building material. On the other hand, the product is not polluted for the environment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Adsorbent Materials on the Base of Ash and Lime for Lead Removal

Harja¹,

Kotova²,

Ciobanu³

et al. 2017

Simi 2017

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“…For each batch experiment 50 mg of the prepared MoO 3 were contacted with 10 mL of each solution in polycarbonate tubes and the mixture was agitated on a mechanical shaker for 24 h. The mixture was then centrifuged at 4000 rpm for 10 min to separate the sorbent from the supernatant and the equilibrium pH was measured. The residual concentration of the metal in the supernatant was finally determined by c-ray spectroscopy using a HPGe detector (CANBERRA, REGe detector, efficiency 20 %, energy resolution 2.1 keV for the 1332 keV 60 Co c-radiation) connected with a standard computerbased gamma-spectroscopy set-up (in the case of the Ba, Cs and Eu), atomic absorption spectrometry-AAS with a Perkin Elmer Spectrophotometer (model 300A) (in the case of Pb) and Arsenazo-III method with a Shimadzu UV160A Spectrophotometer (in the case of U) [30][31][32].…”

Section: Sorption Experimentsmentioning

confidence: 99%

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Kapnisti

Noli

Arvanitidis

et al. 2015

J Radioanal Nucl Chem

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The effectiveness of a low cost sorbent produced by thermal modification of ammonium heptamolybdate (AHM) in adsorption of radionuclides and heavy metals was investigated. The product was characterized by XRD, SEM and Raman spectroscopy. Sorption experiments were performed in Pb, U, Cs, Ba and Eu solutions (pH 2.0-6.0). The obtained isotherms were simulated by Langmuir and Freundlich isotherms and kinetics data were used in order to evaluate the sorption mechanism. The results showed the high and selective efficiency of the AHM-derived MoO 3 especially in Pb and U removal whereas the desorption experiments revealed its environmental applicability under real conditions for the investigated metal cations.

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“…The most application of the oxidic nanomaterials are catalysis, biomedicine, coatings, semiconductors etc. (Harja et al 2016, Kotova et al 2018, Noli et al 2015. Semiconductor materials are attractive due to their properties reported different potential applications (Mousavi-Kamazani et al 2015, Li et al 2016.…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS OF ZnO/CuO NANOCOMPOSITES WITH CNF AND Ag BY GEL SOL

Duduman¹,

José²,

Castro³

et al. 2018

Simi 2018

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The synthesis of ZnO/CuO with Carbon Nanofiber (CNF) and Ag nanocomposites have been conducted. Nanocomposites were synthesized using sol-gel method. The nanocomposite products were characterized by SEM, TEM, XRD and DSC. The results of the XRD analysis showed that the CuO-ZnO composite has a nanometer size with the average of 10 nanometer. The SEM-EDX analysis showed that the ZnO has a hexagonal structure whereas the CuO has a monoclinic structure. The importance of impregnating the nanofibers with the precursors has been demonstrated. The hydrazine is a better reducing agent than tannic acid. In this study was synthesized polycrystalline silver as evidenced by XRD. SEM-EDAX analysis indicate presence of oxides, nanofibers and silver.

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New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals

Cited by 16 publications

References 44 publications

New Adsorbent Materials on the Base of Ash and Lime for Lead Removal

New Adsorbent Materials on the Base of Ash and Lime for Lead Removal

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

SYNTHESIS OF ZnO/CuO NANOCOMPOSITES WITH CNF AND Ag BY GEL SOL

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