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Binary composite WS2/TiO2 nanofibers (WTN) were elaborated by electrospinning technique. The photocatalytic efficiency of the binary nanofibers was changed via different ratios between WS2 and TiO2. The structural, morphological and optical properties of the prepared nanofibers were evaluated by Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (UV-vis/DRS), respectively. The prepared nanofibers showed a remarkable performance in photocatalytic efficiency of phenol compound degradation under visible light. WTN nanofibers showed superior photocatalytic activity (83%) and high stability of several cycles under visible light. Therefore, WS2/TiO2 nanofibers have great prospects for the treatment of wastewater from toxic organic contamination due to their excellent photocatalytic performance reusability and recyclability.

Grafted copolymer (sodiumalginate (Na. Alg)-acrylic acid (AcA)methacrylic acid (MAcA)) was prepared by the gamma irradiation-induced copolymerization in the presence of N, N-methylene bis-acrylamide (MBA) as aco monomer crosslinker. The functionality, morphology and thermal stability of the prepared copolymer have been examined using FTIR spectroscopy, SEM, and TGA-DTA, respectively. The prepared material shows a smooth surface and relatively homogeneous appearance which reveals incompatibility between the monomers used. Thermal analysis of the prepared material shows stability near 400°C. The effect of the preparation conditions on the swelling property of the prepared copolymer has been investigated and the mechanism of grafting copolymerization through the irradiation process has been also discussed. The obtained results revealed that the optimum conditions for preparing a suitable grafted copolymer were using 20% Acrylic acid, 10% Methacrylic acid and 0.4 wt% sodium alginate at an irradiation dose of 15 kGy with the addition of 0.03 % of MBA as a crosslinker.

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