The optimized molecular structures, vibrational frequencies and corresponding vibrational assignments of conformations of 2-hydroxy-3-nitropyridine and 3-hydroxy-2-nitropyridine molecules have been investigated using ab initio Hartree–Fock (HF) and density functional theory (B3LYP) methods with...

Solvent effects on 2-hydroxy-4-methyl-3-nitropyridine molecule in different solvents (benzene, toluene, chloroform, acetone and water) were studied theoretically at the DFT/B3LYP level in combination with the conductor polarizable continuum model (CPCM) for the first time. Based on these results...

In this study, the conformational stability of 2-hydroxy-4-methyl-3-nitropyridine and 2-hydroxy-4-methyl-5-nitropyridine has been analyzed, and vibrational analyses of the same have been carried out by the application of B3LYP/6-311++G** basis set based on scaled quantum mechanical (SQM) method....

A Novel pyridine derivative 3-hydroxy 2-nitropyridine (3H2NP) was crystallized using slow evaporation solution growth technique (SEST). Single crystal XRD analysis was carried out to elucidate the structure of this organic material. 3H2NP was crystallized in a monoclinic crystal system with cent...

Four organic salt complexes of 3-hydroxypyridine (3-HP) with nitro-substituted aromatic and heterocyclic carboxylic acids have been prepared and their X-ray crystal structures reported. These complexes are 3-hydroxypyridinium 5-nitrofuran-2-carboxylate 1, 3-hydroxypyridinium 4-nitrobenzoate 2, 3...

Based on the 2,2′-bipyridine-5,5′-dicarboxylic acid ligand (H2bpdc), a new metal–organic framework using holmium as the coordinating metal site was synthesized through a solvothermal reaction. The 3D compound {[Ho2(bpdc)3(DMF)2]·2(DMF)}n (1) was characterized by single crystal X-ray diffract...

The valorization of phosphogypsum (PG) is an efficient way to minimize its negative environmental impacts. This work is built on the use of PG as an environmental-friendly source for the production of sodium sulfate and calcium silicate. The reaction of PG transformation is carried out at room t...

To reduce the carbon footprint and energy consumption from the cement manufacturing industry, lime-based low carbon cementitious materials (LCM) has caught strong attention. LCM as a novel low-carbon cement shows impressive performance and promising prospects; however, its mechanical properties ...

Supercritical water gasification (SCWG)having been developed for over 30 years is an efficient and clean hydrogen production technology. Biomass and coal are often used as good raw materials of SCWG, meanwhile achieving their clean conversion and utilization. However, salts such as sodium sulfat...

The separation and recovery of scandium and titanium from hydrolyzed sulfuric acid solution of titanium dioxide production using solvent extraction was investigated. A mixed solution of Na3PO4 and H2O2 was used to selectively scrub titanium from the loaded organic solution containing scandium an...

The waste acid from the titanium pigment production process contains scandium ion at low concentration. The waste is thus an extra resource for scandium. To recover the trace scandium from the waste acid, a process combining pre-enrichment and purification steps via solvent extraction using the ...

Four scandium phosphate-based structures have been prepared hydrothermally in the presence of the primary diamines ethylenediamine and diaminobutane and the primary amine cyclohexylamine and characterised by single crystal and powder X-ray diffraction, 31P and 45Sc solid-state MAS NMR and chemic...

In our previous study, it has been proven that the content of scandium could be enriched to about 0.04 wt% in a solid product after proper pretreatment of bauxite ore residue. The extraction of scandium from this scandium-rich material was investigated in the present study, with emphasis on both...

Tropical ultramafic regoliths (derived from iron‑magnesium‑nickel-rich mantle rocks) can yield significant nickel and cobalt ore reserves and are mined across the Asia-Pacific Region. In some instances, ultramafic laterite deposits are also enriched in scandium. However, the behaviour of scandiu...

A study was carried out for recovery of scandium from KOH sub-molten salt (SMS) leaching cake of fergusonite. Major metals in the cake were rare earths (RE), K, Th, U and Ca, and minor metals were Pb, Nb, Ta, Ti, Fe, Si, Sn, Al, Bi and Mn. Scandium content was about 0.94% in the cake. Experiment...

Radiative thermal neutron capture by an atom combined in an anionic species very seldom leads to an oxidised radioactive product. The products formed in irradiated hydrated or anhydrous sodium selenite comprise radioactive elemental selenium, selenite and selenate. Equally surprising, on thermal...

Pr2−xSrxNi0.6Cu0.4O4+δ (PSNCO, x = 0.1, 0.3, 0.5) oxides with K2NiF4-type structure are synthesized by a glycine–nitrate process as potential cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The influence of strontium substitution on the structure, oxygen nonst...

The surface chemistry of barium strontium iron cobalt oxide of nominal composition Ba0.5Sr0.5Co0.8Fe0.2O3−δ has been studied using X-ray photoelectron spectroscopy (XPS). Precursor powders were prepared by a wet chemical process and sintered into pellets at 1100 °C. Polished pellets were exami...

Strontium ranelate, a new agent for the treatment of osteoporosis, has been shown stimulate bone formation in various experimental models. This study examines the effect of strontium ranelate on gene expression in osteoblasts, as well as the formation of mineralized (von Kossa-positive) colony-f...

A new cathode material for the potential use in light-emitting devices, based on porous anodic alumina (PAA), aluminum and ITO layers has been synthesized. Porous alumina samples with ordered pore arrays were prepared electrochemically from high purity Al sheet in H2SO4 and H3PO4. To be able to ...