Degradation of pesticides by heterogeneous Fenton using iron-exchanged clays

The aim of this research is to study the feasibility of using low-cost and natural bentonite and kaolinite clays, compared with commercial bentonite, as raw materials to prepare catalysts for the removal of two emerging pollutants, the neonicotinoid pesticides nitenpyram and acetamiprid, by heterogeneous Fenton process. The raw materials were subjected to a simple ion exchange method to improve their textural properties using a solution containing ferric cations followed by calcination at 500 °C. Results show high activity for all the catalysts in the removal of these pesticides, Stability tests were carried out confirming the high stability of these materials

Swift heavy ion irradiation effect on structural, morphological and mechanical properties of Zr 70 Ni 30 metallic glass

International audienceAbstract Metallic glass films are considered for coating applications in the nuclear field owing to their advantageous performances. However, the response to irradiation remains to be more thoroughly characterized. Zr 70 Ni 30 metallic glass films were irradiated by 0.71MeV/u 129 Xe 23+ ions in the fluence range from 5 × 10 12 to 8 × 10 13 ions cm −2 . The structural, morphological, and mechanical properties were determined using grazing incidence X-ray diffraction (GI-XRD), atomic force microscopy (AFM), and nanoindentation for the as-deposited and irradiated samples. The Xe ion induced surface smoothening, thereby increasing the corrosion resistance. One-dimensional power spectral density of the AFM data of irradiated film demonstrated that the irradiation-induced evolution of the surface morphology could be attributed to a transition between viscous flow and the evaporation-condensation mechanism. The amorphous structure was unaffected after irradiation up to a fluence of 8 × 10 13 ions cm −2 . Nanoindentation revealed first a softening as the fluence increases up to 4 × 10 13 ions cm −2 , reflecting the creation of free volume defects. Then the hardness and Young’s modulus slightly increase when reaching 8 × 10 13 ions cm −2 . Moreover, at a critical dose of 0.008 dpa, the hardness is found to increase. Moreover, the calculation of the inelastic thermal spike model reveals the formation of the track with a radius of 7 nm