Publications

In this work, we have developed novel beads based on carboxymethyl cellulose (CMC) encapsulated copper oxide-titanium oxide (CuO-TiO₂) nanocomposite (CMC/CuO-TiO₂) via Al⁺³ cross-linking agent. The developed CMC/CuO-TiO₂ beads were applied as a promising catalyst for the catalytic reduction of organic and inorganic contaminants; nitrophenols (NP), methyl orange (MO), eosin yellow (EY) and potassium hexacyanoferrate (K₃[Fe(CN)₆]) in the presence of reducing agent (NaBH₄). CMC/CuO-TiO₂ nanocatalyst beads exhibited excellent catalytic activity in the reduction of all selected pollutants (4-NP, 2-NP, 2,6-DNP, MO, EY and K₃[Fe(CN)₆]). Further, the catalytic activity of beads was optimized toward 4-nitrophenol with varying its concentrations and testing different concentrations of NaBH₄. Beads stability, reusability, and loss in catalytic activity were investigated using the recyclability method, in which the CMC/CuO-TiO₂ nanocomposite beads were tested several times for the reduction of 4-NP. As a result, the designed CMC/CuO-TiO₂ nanocomposite beads are strong, stable, and their catalytic activity has been proven.

The electrodeposition of polyaniline on stainless steel electrode was carried out in aqueous media at two different concentrations of sulphuric acid under potentiodynamic conditions. It was found that the nature of the voltammograms in 0.5M and 1M of H2SO4 are simillar. The first voltammetric wave (A1 & C1) of the cyclic voltammograms corresponding to transition from leucoemaraldine (LE) state to emeraldine (EM) state. The deposited films were characterized electrochemically and microscopically. The deposition of polyaniline appears to occur over the passive metal oxide film and the electron transfer between the polymer and the metal occur. Polyaniline films on stainless steel appear to be promising for metal anodic protection in corrosive aqueous media. The electrochemical parameters of the electrodeposited polyaniline were determined using cyclic voltammetry, convolution- deconvolution transforms and derived chronoamperograms.

In the title compound, C(20)H(18)BrNO(4)S(2), the mean planes formed by the toluene substituents are inclined at a dihedral angle of 45.34 (8)°. The bromo-benzene group is disordered over two positions with an occupancy ratio of 0.74:0.26, resulting in two conformations of the ring; the two rings are oriented at a dihedral angle of 6.6 (6)° with each other. In the crystal structure, weak C-H⋯O inter-actions connect the mol-ecules in a zigzag manner along the a axis.

As a durable water oxidation electrocatalyst, an FeMoO₄nanorod array on nickel foam (FeMoO₄/NF) shows superior catalytic activity offering a geometrical catalytic current density of 50 mA cm⁻²at an overpotential of only 293 mV in 1.0 M KOH.

Three series of polyethylene glycol–carbon nanotube nanocomposites in the form of PEG/CNT_a–e, PEG/f-CNT.Oxi_a–e, and PEG/CNT.C_18a–ehave been fabricated using a dissolution stirring ultra-sonication method.