TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant

Favier, Lidia; Harja, Maria

doi:10.1007/978-3-030-11155-7_11-2

Cited by 4 publications

(2 citation statements)

References 59 publications

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“…This type of material contains principally SiO 2 and Al 2 O 3 [1], elements that recommend the use of ash in a large spectrum of applications. For example, it is used for zeolite synthesis [2,3], as catalysts [4], in construction as filler or as a precursor for geopolymers [5][6][7], as an adsorbent [8][9][10][11], for ceramics [12,13], etc. Thus, many studies were involved in order to find a solution that would allow its utilization.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Buema

Harja

Lupu

et al. 2021

Water

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The initial characteristics of Romanian fly ash from the CET II Holboca power plant show the feasibility of its application for the production of a new material with applicability in environmental decontamination. The material obtained was characterized using standard techniques: scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), instrumental neutron activation analysis (INAA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), the Brunauer–Emmett–Teller (BET) surface area, and thermogravimetric differential thermal analysis (TG-DTA). The adsorption capacity of the obtained material was evaluated in batch systems with different values of the initial Cu(II) ion concentration, pH, adsorbent dose, and contact time in order to optimize the adsorption process. According to the experimental data presented in this study, the adsorbent synthesized has a high adsorption capacity for copper ions (qmax = 27.32–58.48 mg/g). The alkali treatment of fly ash with NaOH improved the adsorption capacity of the obtained material compared to that of the untreated fly ash. Based on the kinetics results, the adsorption of copper ions onto synthesized material indicated the chemisorption mechanism. Notably, fly ash can be considered an important beginning in obtaining new materials with applicability to wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Buema

Harja

Lupu

et al. 2021

Water

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“…A photocatalytic process supposes the capturing of light energy (UV or visible range), mediated by a semiconductive material, generating Materials 2020, 13, 4916 2 of 19 an electron-hole pair, by the promotion of an electron from the valence band to the conduction band. This step in turn initiates a series of reactions with the participation of water and dissolved oxygen and generates HO• radicals and other active oxidizers [7,8]. The adsorption of a POP (Persistent Organic Pollutant) on the surface of a photocatalyst renders possible the joint between this species and oxidant species, resulting in the gradual decomposition of the compound, up to the total mineralization to CO 2 and H 2 O, in an ideal situation [1,2,9,10].…”

Section: Introductionmentioning

confidence: 99%

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

et al. 2020

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Mixed oxides containing zinc and lanthanum were prepared by coprecipitation in alkaline medium, followed by calcination at 400 °C. The initial precipitation product and the calcined form were characterized by Brunauer–Emmett–Teller (BET) method adsorption of nitrogen at −196 °C, Scanning Electron Microscopy/Electron-Probe Microanalysis (SEM/EPM), Ultraviolet - Diffuse Reflectance Spectroscopy (UV-DRS) and Infrared (IR) spectroscopy. The band gap slightly changes from 3.23 eV to 3 eV by calcination. The photocatalytic performance of the solids were investigated in diluted aqueous medium, by using clofibric acid (CA), a stable and toxic molecule used as precursor in some pesticides and drugs, as test compound, possibly found in the wastewaters in low concentrations. The effects of the degradation extent, determined by high performance liquid chromatography (HPLC) and total organic carbon (TOC) measurements, were investigated at different initial concentrations of CA. Within about 60 min the CA degradation is almost total at low concentration values (3 ppm) and reaches over 80% in 180 min for an initial concentration of 50 ppm. Moreover, the CA removal performance of photocatalyst remains excellent after three cycles of use: the removal yield was practically total after 60 min in the first two cycles and reached 95% even in the third cycle.

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Coal fly ash: an emerging material for water remediation

Singh

Agarwal

et al. 2022

Int J Coal Sci Technol

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Coal fly ash (CFA) is a byproduct of thermal power plant and collected from flue gases by separator. Composition of CFA depends on the type of coal used and it has both crystalline and amorphous character. It is considered to be an environmental pollutant and used in number of areas. CFA is a useful material and widely used in cement production and as a promising adsorbent for water remediation. CFA used for remediation of wastewater solves problems related to water quality issues and waste management. The physical properties such as porosity, surface area, morphology, and chemical composition (iron oxide, alumina, silica, titania, etc.) make CFA efficient material for wastewater treatment. CFA is also converted to geopolymer, which is used as an adsorbent and photocatalyst. Dye, organic compounds, toxic heavy metal ions, etc. have been removed using CFA and modified CFA adsorbents. Different adsorption efficiencies have been reported for different adsorbate and CFA adsorbents. Numbers of adsorption isotherm and kinetic models have been discussed.

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TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant

Cited by 4 publications

References 59 publications

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

Coal fly ash: an emerging material for water remediation

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