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Graphitic Carbon Nitride Heterostructures for Energy and Environmental Applications
Published in A. Pandikumar, K. Jothivenkatachalam, S. Moscow, Heterojunction Photocatalytic Materials, 2022
Samarium oxide (Sm2O3) is a rare earth metal oxide crystal with high resistivity, strong UV absorption capacity, and good chemical and thermal stability. Li et al. [63] reported a heterojunction formed by Sm2O3, Ni7S6, and GCN for improved electron–hole separation and photocatalytic performance. Hexagonal-shaped Sm2O3 and irregular Ni7S6 of sizes 50 nm and 31 nm were distributed on the GCN nanosheets. The introduction of the heterostructure resulted in improved specific surface area, dye adsorption and charge transfer. The UV–visible DRS showed that the Sm2O3@Ni7S6-GCN heterostructure had an expanded absorption range in the visible spectrum with reduced bandgap and improved charge carrier separation and transfer rate. H2 production increased almost 15 times compared to pristine GCN with the introduction of the heterostructures due to higher pore volume (0.19 cm3/g), pore diameter (6.35 nm), specific surface area (102.10 m2/g), larger bandgap, longer photogenerated charge carriers, and better electron conductivity. The H2 production did not decrease significantly after four cycles though subsequent cycles showed a slight decrease due to degradation of EY because of increased irradiation time. The heterostructures also exhibited better electron transfer rate, where Sm2O3 promotes the transfer of photogenerated electrons and restrains charge recombination.
Investigation of good dopant (Sm, Cu, Tb, Mn, Sb) for radiation dosimetry in the γ-excited GdCa4O(BO3)3phosphor: mechanoluminescence study
Published in Radiation Effects and Defects in Solids, 2022
G. C. Mishra, Upendra K. Verma, S. J. Dhoble
The GdCa4O(BO3)3 with completely different dopants (Sm, Cu, Tb, Mn, Sb) were ready by a solid-state reaction method at high temperatures. Raw materials were Gadolinium oxide, Calcium Carbonate, Boric Acid, Antimony trioxide (all are A.R., Himedia), Cupric Oxide, Samarium Oxide, Manganese Dioxide (all are Extra Pure, LOBA), Terbium Oxide (99.9% purity, Sigma Aldrich). A stoichiometric ratio of all the raw materials was beached systematically followed by heat at around 750°C intended for 10 h and after that frozen gradually Again these samples were grounded and fired at 850℃ for another 10 h then cooled. The same process was repeated with different concentrations (0.05 to 1 mol%) of dopants (CuO, Sb2O3, Sm2O3, MnO2, Tb2O3). The chemical reaction is:
Physicochemical, in vitro therapeutic activity, DNA-binding, and in silico molecular docking studies of samarium(III) complexes bearing N,O-chelated Schiff base ligands
Published in Journal of Coordination Chemistry, 2022
Laila H. Abdel Rahman, Nabil Al-Zaqri, Amani A. Abdelghani, Ehab M. Abdalla
The samarium, carbon, nitrogen, and hydrogen content of the compounds are recorded in Table 1. The calculated values agree well with the theoretical values calculated using the proposed general formula [Sm(L)2Cl(OH2)] and the molar ratio is 1:2 metal to ligand. Samarium was determined gravimetrically as samarium oxide. Molar conductance results of the prepared complexes in DMF (10−2 M) displayed low values (3.77-8.90 Ω−1cm2Mol−1), indicating that the prepared chelates are nonelectrolyte and, hence, are neutral chelates. Magnetic measurements of the new chelates indicated that SmL1 and SmL2 complexes with 4f5 electronic configuration are paramagnetic with 3.77 and 3.99 BM and octahedral geometry, respectively. The new complexes are colored material and decompose above 300 °C, which proves that the complexes are thermally stable.
Characterization and analysis of sediments in stormwater drainage for reuse
Published in Journal of Applied Water Engineering and Research, 2021
Carlos Peña-Guzmán, Jeimmy Cárdenas, Amelia Pérez, Andrés Torres, Karen Mora-Cabrera
The PCA allowed us to eliminate variables that did not contribute to the statistical model: depth, volatile solids, humidity, percent sand, percent clay, shear stress, length of pipe, diameter of pipe, differences in levels and slopes, along with the following compounds: chromium oxide (CrO), strontium oxide (SrO), manganese dioxide (MnO2), vanadium oxide (V2O5), nickel oxide (Ni2O3), lead oxide (Pb3O4), actinium oxide (Ac2O3), gold oxide (Au2O3), germanium monoxide (GeO), rubidium oxide (Rb2O), yttrium oxide (Y2O3), samarium oxide (Sm2O3), zirconium dioxide (ZrO2), caesium oxide (Cs2O), polonium dioxide (PoO2), europium oxide (Eu2O3), barium oxide (BaO), tantalum pentoxide (Ta2O5), and lutetium oxide (Lu2O3) because their percentage in the sediments was less than 0.01%. Finally, the statistical analyses were conducted using 17 variables (3 qualitative and 13 quantitative).