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The present work aims to study the anticorrosion and the photodegradation properties of titanate nanotubes (TiNTs) and vanadium doped-titanate nanotubes (V-TiNTs). Moreover, this article seeks to investigate the effect of doping TiNTs by vanadium species at different amount (2, 5 and 10 wt %). The raw materials (i.e:TiO 2 and V 2 O 5-TiO 2) are obtained by a sol gel process, while the hydrothermal treatment is chosen to achieve the hollow structure. The structural evolutions and morphological characteristics of materials have performed using various techniques such as: Scanning Electron Microscopy and Energy Dispersive X-ray (MEB/EDS), X-ray diffraction (XRD), UV-Visible in Reflection Diffuse spectroscopy (RD/UV-Vis) and Fourier Transform InfraRed spectroscopy (FTIR) analysis. However , the anticorrosion properties of the synthesized nanotubes are evaluated on mild steel corrosion in 1 N HCl using a weight loss method. All materials showed a potential inhibitor effect (up to 90 %) depending on the vanadium percentage and the inhibitor concentration. The photodegradation activity of the prepared materials is evaluated in the photodegradation of two organic pollutants: Methylene Blue (MB) and Malachite Green (MG) under UV-Visible irradiation. The obtained results underlined the improvement of photocatalytic activity of TiNTs by vanadium species. A conversion rate up to 96 % is achieved at reduced time. Therefore, the prepared materials could be suitable for the anticorrosion of mild steel and the photodegradation of organic pollutants.

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The bulk room-temperature polymerization of styrene initiated by environmentally friendly catalysts Maghnite-Na + is investigated. The catalyst removed from the reaction mixture simply by filtration could be regenerated and reused. The effect of the Maghnite-Na + catalyst loading on degree of polymerization had been studied and state their inverse relation. The catalyst was characterized by X-ray diffraction and FTIR spectroscopy.

INTRODUCTIONT h e c o m m o n l y u s e d c o m m e r c i a l divinylbenzene (technical grade) contains metaand para-isomers of divinylbenzene (DVB) and ethylvinylbenzene (EVB). It is usually composed of 50 to 80 wt % DVB, and, depending on polymerization methods, either linear or crosslinked polymers or copolymers of DVB can be prepared 1 .The most popular method for preparing linear polydivinylbenzene is by using anionic polymerization techniques. With this method Aso et al obtain, in 1968, ortho-divinylbenzene using organolithium and alkali metal-naphtalene catalysts in various ethers ABSTRACTThe polymerization of divinylbenzene (DVB) catalyzed by Maghnite-H + is investigated. This paper shows that the cationic polymerization of DVB is initiated by Maghnite-H + at 28°C in bulk and gives the linear poly (divinylbenzene-co-ethylvinylbenzene) which is proved with 1 H and 13 C NMR spectra. The effect of the amount of Maghnite-H + on the molecular weight and the intrinsic viscosities is studied. The results indicate that the molecular weight and the intrinsic viscosities increased with the decrease in the proportion of catalyst. According to our results, a mechanism of this polymerization was proposed.