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Jul 04, 2024Open Access
This work aims to characterize clay soil taken from Loudima, one of the localities in the department of Bouenza in Congo Brazzaville. X-ray diffraction, infrared spectroscopy, MEB, X-ray chemical analysis and mechanical tests were performed. The results obtained show that the Loud soil sample is a mixture of Kaolinite (41.33%), quartz (16.03%) and iron oxide (2.93%). By chemical analysis, we noted that the SiO 2/Al 2O 3 ratio = 2.16, which indicates that this soil c...
May 24, 2024Open Access
In this work, a new ligand [13]aneN 4 with anthracene, pyrene and naphthalene was synthesized and characterized by mass spectrometry, NMR, UV-Vis and fluorescence spectroscopies. The fluorescence quantum yield of the ligands is significantly less than the chromophore group alone. This low value can be explained by the presence of a photoinduced electron transfer of the free doublet from the nitrogen atom of the functional group to chromophore group. The fluorescence studies were also p...
Apr 28, 2023Open Access
Diclofenac (DCF) is a non-steroidal anti-inflammatory drug (NSAID) used to relieve pain in joint-related diseases. It is not completely metabolized after consumption and cannot be easily removed using conventional wastewater treatment. DCF has been detected in water bodies and may pose chronic effects on the endocrines of living organisms even at low-level exposure. Heterogeneous photocatalysis provides an alternative and efficient method of degrading DCF. In this study, the photocatalytic remov...
Dec 27, 2022Open Access
Calcium carbonates, ground and precipitated, have an established role in material engineering where they serve as fillers and pigments. In this study monohydrocalcite (MHC) was produced from artificial industrial waste brines as a means of sequestering CO 2, and assessed as a potential functional filler, where its properties were compared with other minerals used in the industry. The results from the morphological analysis which compared MHC with the shapes and sizes of filler crystall...
Feb 09, 2015Open Access
The magnetic, electrical and magnetotransport properties of spinel-type
Mg(Fe 0.8Ga 0.2) 2O 4 δ ceramic ferrites have been investigated. The results of the
investigations temperature and field dependences of magnetization and
resistivity are presented and analyzed. The data of neutron scattering were
found to be in good agreement with the Neel model of ferrimagnetism. This
compound is magnetomonophase ferrimagnetic in the wide range of temperatures,...
Oct 22, 2014Open Access
This study deals with the grinding of mill scale in
a laboratory ball mill for different milling time then briquetted by using 2% molasses
as a binder and investigates the effect of grinding of mill scale for different
time on the physicochemical properties and the reduction degree of the mill
scale briquettes via hydrogen. Diffusion process control equation was applied and the energy of activation was calculated = 28.33 kJ/mole.
Sep 10, 2014Open Access
A fire resistant metakaolin geopolymer is developed
and its performance under thermal loading is examined in this paper. The
geopolymer was prepared by mixing metakaolin, doped with solid SiO 2,
with a highly alkaline potassium hydroxide aqueous phase in order to create a
paste that was subsequently cured at 70℃ for a certain period
of time. The addition of solid SiO 2 was important in order the
geopolymer developed to be fire resistant for temperatures up to 1350℃. The mecha...
Sep 10, 2014Open Access
Metronidazole is a derivative of benzimidazole. It
is being used widely for the treatment of amoebiasis. An efficient, simple and
least time consuming spectrophotometric method for the assay of metronidazole
has been developed. Comparison of assay of three different brands of metroni-da- zole has also been available in public medical stores of Karachi, Pakistan. The assay is based on
the ultraviolet UV absorbance maxima at about 340 nm wavelength of
metronidazole using water as solvent. A sample...
Aug 12, 2014Open Access
Reduction
kinetics of titanomagnetite concentrate briquettes produced from Rossetta-llmenite
ore via 1.5 liter/min hydrogen flow rate were investigated at different
temperatures ranging from 600℃ to 950℃. It was found that the best reduction
properties were found at 950℃, so the kinetic models shown by the briquettes
at this temperature maybe: Diffusion control or Diffusion through ash layer
(crank-cins ...
Jun 26, 2014Open Access
The study was conducted to evaluate the
effectiveness of the designed microscale experiments in developing the learning
outcomes of the students along the cognitive, affective and psychomotor
domains. It was meant to describe and compare the learning outcomes of the
students who were exposed and not exposed to microscale experiments and
identified the learning experiences of the students exposed to the microscale
experiments. The study used the pretest a ...
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