R.V. College of Engineering

The title carbazole derivative, C 14 H 11 N 3 , was prepared by reacting 1-hydroxy-8-methyl-9 H -carbazole-2-carbaldehyde with hydrazine hydrate. In the solid state, the fused-ring system is slightly puckered, the dihedral angle between the planes of the outer rings being 2.24 (7)°. In the crystal, molecules are linked by {N—H} 2 ...N hydrogen bonds to generate [010] chains, and weak C—H...π contacts consolidate the structure. A Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H...H (43.1%), C...H/H...C (36.8%) and N...H/H...N (15.3%) interactions.

This study assesses the effectiveness of NiFe₂O₄ nanoadsorbent for uranium removal through adsorption from both synthetic and natural groundwater.Solution Combustion was used to synthesize NiFe₂O₄, which was then characterised by XRD, SEM, EDS, FTIR, Raman, XPS, zeta potential and ESR.Through parameter optimization in adsorption trials, >90% U(VI) removal was achieved at pH 6, 75 min, and 0.3 g of adsorbent.NiFe₂O₄ followed pseudo second order kinetics (21 mgg^-1) and the Langmuir isotherm (12 mgg^-1), showing high efficiency, strong electrostatic interactions and five-cycle recyclability.This study highlights Potential of NiFe2O4 as a reusable, effective uranium adsorbent under ambient conditions.

The current study′s objective was to investigate the potential applications of synthesized magnesium oxide nanoparticles (MgO NPs) as green fuel through solution combustion with leaves of tulsi (holy basil).The end product was further calcined for 3 h at 800°C to produce a well-crystalline nanomaterial.Transmission electron microscopy (TEM) examinations indicated a typical crystallite size of approx. 52 nm, determined by applying Scherer′s formula.The results from the scanning electron microscope (SEM) revealed a morphol. that is clumped, puffy, and porous.The energy band gap (Eg) values for MgO NPs were determined to be 4.31 eV using DRS data, verifying the semiconductor behavior of the NPs.Degradation experiments were conducted on two dyes, Fast Blue (FB) and Fast Orange (FO), exposed to UV light for 90 min.Under UV light, the photocatalytic degradation of FO (80.35%) and FB (80.5%) reached their maximumA graphite paste electrode was used for cyclic voltammetry (CV), electrochem. impedance spectroscopy (EIS), and sensor investigations.The cyclic CVs of the MgO NPs-modified graphite paste electrode in 0.1 M NaOH were scanned at 10 to 50 mV/s to determine the specific capacitance values of 250.3 Fg^-1.Based on the acquired EIS data, the MgO NPs used as the electrode displayed pseudocapacitive capacitor characteristics.Further, the proposed sensor was employed to determine the Pb²⁺ and Li⁺ ions in water and showed sensitivity in the order of 0.005 and 0.006 A.Therefore, MgO NPs synthesized via green solution combustion may have excellent applications as photocatalysts and electrochem. sensors.