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Enhanced UVB Photoluminescence Intensity of Calcium Phosphate Co-doped with Gadolinium and Praseodymium for Phototherapy Applications
Published in Odireleng Martin Ntwaeaborwa, Luminescent Nanomaterials, 2022
Various methods (co-precipitation, urea combustion, and microwave-assisted) were used to synthesize calcium phosphate co-doped with gadolinium (Gd3+) and praseodymium (Pr3+). The precursors used were calcium nitrate (Ca(NO3)2·NO2O), di¬ammonium hydrogen phosphate ((NH4)2HPO4), gadolinium nitrate (Gd(NO3)3·6H2O), and praseodymium nitrate (Pr(NO3)3·6H2O).
A statistical analysis on tar reduction in producer gas for IC engine application
Published in International Journal of Ambient Energy, 2021
S. Ramasubramanian, M. Chandrasekaran
The silica gel is synthesised from condensation of Titanium Tetra IsoPropoxideTi{OCH(CH3)2}4(TTIP), hydrochloric (HCl) acid and ethanol in the ratio 1:0.25:6, respectively, at 60°C for 1 h. The hydrated nickel nitrate (Ni (NO3)2·6H2O) and silica are dissolved in deionised water in the mole fraction of 0.15:0.85. Further, cetyl trimethyl ammonium bromide (CTAB) (2.1 × 10−4 mol/l) is also dissolved and allowed for constant stirring. After complete mixing, possible absorbed ions and chemicals are removed. Then it is dried in a hot air oven at 120°C for 2 h at a heating rate of 10°C/min. Dried samples are calcined in muffle furnace at 600°C for 6 h at a heating rate of 20°C/min. This process resulted in the formation of Ni/TiO2 nanostructured catalyst. The Ni (NO3)2·6H2O is replaced by Cerium nitrate (Ce(NO3)3.6H2O) and Praseodymium nitrate (Pr(NO3)3.6H2O) for obtaining Ni-Ce/TiO2 and Ni-Pr/TiO2 nanocatalyst. The obtained powders are pulverised and pelletised. The photographs of the Ni/TiO2, Ni-Ce/TiO2 and Ni-Pr/TiO2 nanocatalyst pellets are shown in Figure 1(a–c), respectively.
Optimisation of catalytic system for tar mitigation in biomass producer gas
Published in International Journal of Ambient Energy, 2020
S. Ramasubramanian, M. Chandrasekaran
The silica gel is synthesised from condensation of tetraorthosilicates (TEOS), hydrochloric (HCl) acid and ethanol in the ratio 1:0.25:6, respectively, at 60°C for 1 h. The hydrated nickel nitrate (Ni (NO3)2.6H2O) and silica are dissolved in deionised water in the mole fraction of 0.15:0.85. Further, cetyl trimethyl ammonium bromide (2.1 × 10−4 mol/l) is also dissolved and constantly stirred. After complete mixing, the possible absorbed ions and chemicals are removed. Then it is dried in a hot air oven at 120°C for 2 h at a heating rate of 10°C/min. Dried samples are calcined in a muffle furnace at 600°C for 6 h at a heating rate of 20°C/min. This process resulted in the formation of a Ni/SiO2 nano-structured catalyst. The Ni (NO3)2.6H2O is replaced by cerium nitrate (Ce(NO3)3.6H2O) and praseodymium nitrate (Pr(NO3)3.6H2O) for obtaining Ni–Ce/SiO2, and Ni–Pr/SiO2 nano-catalyst. The obtained powders are pulverised and pelletised. The photographs of the Ni/SiO2, Ni–Ce/SiO2 and Ni–Pr/SiO2 nano-catalyst pellets are shown in Figure 1(a–c), respectively.
A new stable porous Pr-organic framework constructed by multi-iodine-substituted aromatic polycarboxylates: Synthesis, characterization, and selective adsorption of dyes
Published in Journal of Coordination Chemistry, 2019
Ying Sun, Feng Ying Bai, Xue Min Wang, Yu Wang, Li Xian Sun, Yong Heng Xing
The synthesis of 2,4,6-triiodo-1,3,5 benzenetricarboxylic acid was accomplished in two steps. In the first step, the reaction of mesitylene and iodine was performed by reflux for 72 h to obtain an intermediate 2,4,6-triiodo-1,3,5-trimethylbenzene (M). In the second step, the intermediate M was oxidized by potassium permanganate to obtain 2,4,6-triiodol-1,3,5-benzene tricarboxylic acid (L). The specific synthesis route is shown in Scheme 1. Next, the target product was obtained by reaction of the ligand L and praseodymium nitrate in a Pyrex glass vessel with a molar ratio of 1:1. At the same time, we also screened the optimal conditions for the synthesis of the compound. It was found that the optimum condition was the molar ratio 1:1, the pH of 5, and the temperature of 85 °C.