Showing papers in "Journal of the Korean Ceramic Society in 2022"

High photocatalytic capacity of porous ceramic-based powder doped with MgO

Abstract: Abstract To purify water at low cost for our daily life, the effect of ceramic-based (mullite–cristobalite) and (mullite–zircon) powders doped with different amounts of magnesium oxide (MgO) (10 and 20 wt%) was studied. These compounds are made of a local raw material DD3 with addition of zirconia (ZrO 2 ) to create an open porosity. The powders were prepared by the traditional mixing method with the help of an automated crushing. The effect of MgO doping on structural, morphological and photocatalytic properties of the material was studied by various analytical techniques such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared, and UV–visible spectrometry. The results of XRD proved that there was a deformation in the crystal structure of the two types of ceramics after addition, which resulted in a shift of the spectra to the right, while SEM proved the presence of pores with a larger size as the proportion of MgO increases. The chemical composition of the basic components of the ceramic compounds as well as the additive was confirmed with EDS and IR spectra. The final results show that ceramics with added zirconia (DD3Z) and doped with 10% of MgO have a better photocatalytic efficiency than ceramics without zirconia. This important effect could be related to the higher rate of porosity, which provides a more active surface. The 10% MgO content showed a high photoactivity of 77.33% in only 15 min. The maximum hydrolysis rate obtained with Orange II was 92.95% after a period of 45 min with DD3Z/MgO powders.

Production of high-quality glass foam from soda lime glass waste using SiC-AlN foaming agent

Abstract: Abstract This research presents the possibility of producing durable foam glasses from glass cullet using SiC/AlN foaming agent. The foaming agent generated by the SiC and AlN couple results in a more homogeneous microstructure and thus the emergence of foam glasses with better properties compared to the nitride foaming agent used alone in our previous work. The fabricated foam had a crack-free, 3-D cellular structure with macropores whose geometries varied between elliptical-, pentagonal-, and hexagonal-shaped constructions. It also had a lightweight (≥ 0.18 g/cm 3 ), high cold crushing strength (≤ 4.5 MPa), low thermal conductivity (0.09–0.16 W/m K), and contained more than ~ 89 vol.% gas bubbles enclosed between 11 vol.% impervious glass walls. The properties accomplished by the foam prepared in this work conform with the requirements of international standard for commercial glass foams, demonstrating its strong capability to be utilized in potential applications in sustainable buildings and energy efficiency in industry.

Advances in borate- and phosphate-based TL materials for in vivo dosimetry

Abstract: Thermoluminescence (TL) materials are well known for a very large number of applications in various fields such as medical research, in vivo dosimetry, environmental dosimetry, personal dosimetry, etc. There are several TL materials available in the market such as fluoride, borate, phosphate, silicate, borosilicate glasses, etc. The TL properties of materials change with the doping of rare-earth and transition impurities in different hosts which are useful for different applications. These doped TL materials can be prepared by different techniques such as, the melt-quenching technique, combustion method, sol–gel method, and others. Radiations such as γ-rays, X-rays, β-rays, photon beam, electron beam, neutron beam, etc., can be used to irradiate these TL materials. In the present state of research, interest is being raised to develop new thermoluminescent materials for various applications in the field of material science and radiation therapy for in vivo dosimetry in view of the rise in the number of cancer patients across the globe. In the last few years, borate and phosphate-based TL dosimeters got more attention in radiation dosimetry. So, this review deals with the recent developments and advancements in borate- and phosphate-based TL materials for in vivo dosimetry.