Photoactive transparent nano-crystalline glass-ceramic for remazole red dye degradation

Gad‐Allah, Tarek A.; Margha, Fatma H.

doi:10.1016/j.materresbull.2012.08.054

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…The applied heat treatment regime was intended to allow only the formation of small crystals to uphold the transparency of the formed glass‐ceramic, which is favorable for photocatalysis. These crystals are not large enough to show distinctive peaks in the XRD pattern .…”

Section: Resultsmentioning

confidence: 99%

ZnO enriched transparent glass‐ceramics for wastewater decontamination

Margha¹,

Badawy

Gad‐Allah

2016

Env Prog and Sustain Energy

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Transparent photoactive glass‐ceramic materials containing high content of photoactive ZnO component (up to 40%) have been prepared by applying heat‐treatment for the glass composition SiO2,ZnO, B2O3,Na2O, K2O, P2O5, Li2O, and BaO melted at low temperature (∼1200°C). The prepared materials absorb considerably in UV region and are transparent for visible light. The absorption cutoff shifted towards higher wavelength with the increase of ZnO content. The prepared materials showed proper photocatalytic activity for the degradation of Red SPD Cotton dye as model compound. Maximum removal (76%) was achieved in case of sample containing 30 wt % of ZnO and heat treated at 450°C for 10 h. Therefore, these materials can be considered promising for the degradation of organic pollutants via photocatalysis. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 442–447, 2017

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Section: Resultsmentioning

confidence: 99%

ZnO enriched transparent glass‐ceramics for wastewater decontamination

Margha¹,

Badawy

Gad‐Allah

2016

Env Prog and Sustain Energy

Self Cite

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“…However, further increasing the ZnO/SiO 2 ratio to 50/16, T p of the sample becomes relatively insignificant, which may be due to the precipitation of crystals in the process of melting and cooling of the low-melting glass, resulting in the crystallisation peak of the sample not being obvious in the differential thermal test. However, there is no obvious disintegration peak in the XRD diffraction pattern, which is due to the small crystal size [16,17]. As is known, differential thermal analysis is a process in which the thermal effect is converted into a temperature difference signal and reflected in the differential thermal curve, so differential thermal analysis can indicate the crystallisation of the glass [18,19].…”

Section: Xrd Patterns Of Low-melting Glassmentioning

confidence: 99%

Low-Temperature Fast Firing Preparation of Zn2TiO4 Crystalline Photovoltaic Glass Ink and Its Properties

Chen,

Dong,

Bao

et al. 2024

Inorganics

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A Zn2TiO4 crystalline photovoltaic glass ink was prepared by fast firing at 700 °C for 5 min by the glass crystallisation method, which effectively improved the reflectivity and acid resistance of the photovoltaic glass ink coating. The phase, morphology and properties of the samples were tested by XRD, SEM and UV-vis diffuse reflection, etc. The enhanced reflectivity mechanism was proposed. The results showed that the increase in ZnO/SiO2 ratio reduced the transition temperature (Tg) and crystallisation temperature (Tp) of the glass melt, which could promote the crystallinity of Zn2TiO4 in photovoltaic glass ink coatings and thus improve the acid resistance of photovoltaic glass inks. Significant improvement in reflectance and whiteness is due to the Zn2TiO4 crystallinity growth, which fills in the pores of the ink surface, and TiO2 fillers keep almost the same surface roughness (0.2 µm) and wetting angle (5.2°). Typical samples achieved 89.2% of the whiteness and 88.0% of the reflectance, and the weight loss in acid was 3.9 mg/cm2, which could improve the efficiency of solar power generation.

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“…The applied heat-treatment did not lead to phase transition but enhanced considerably the crystallinity by allowing the growth of Bi 2 Mo 2 O 9 crystals. In a sample heat treated at 355 1C for 2 h followed by another heating step at 400 1C for another 2 h, distinctive diffraction peaks at 27 Therefore, the used composition and the applied heattreatment could stabilize the β-Bi 2 Mo 2 O 9 phase which is normally unstable at this temperature according to Cruz and Lozano [16]. Applying one-step heat-treatment (500 1C/2 h) further improves the crystallinity of the material which is evidenced by the increase in peak intensity with heat-treatment, but it did not affect the formed phase.…”

Section: Characterization Of Prepared Materialsmentioning

confidence: 99%

“…The crystal sizes (Lc) of the photoactive phases β-Bi 2 Mo 2 O 9 or BiVO 4 before and after heat-treatment were calculated using Scherrer's equation [27] L c ¼ kλ β cos θ 0 where k is related to the shape of the polycrystals (usually taken as 0.94), λ is the X-ray wavelength, is the full-width at half maximum (FWHM) of the respective diffraction peak, and is the Bragg angle. The diffraction planes (320) and (112) were used for the calculation of crystallite sizes in case of Mo and V glass samples, respectively.…”

Section: Characterization Of Prepared Materialsmentioning

confidence: 99%