Electro-Fenton catalyzed with magnetic chitosan beads for the removal of Chlordimeform insecticide

International audienceThe degradation of chlordimeform (CDM) has been investigated by a heterogeneous electro-Fenton process involving magnetite supported chitosan beads (Fe3O4-Cs) as catalyst. The catalyst was prepared by dropwise addition of an acidic chitosan-metal salts solution into sodium hydroxide precipitation bath. SEM, XRD and FTIR analysis were used to characterize the catalysts. The effect of experimental parameters, such as the current intensity, the amount of iron on chitosan beads, the concentration of the catalyst and the initial pH on the pollutant removal rate was investigated. The optimal conditions for the degradation of 37.5 mg L−1 initial CDM concentration were achieved at an applied cathodic current of −5 mA, using 0.5 g L−1 of magnetic chitosan beads (with an average iron amount of 0.104 mmol) and at pH = 3. Under these conditions, CDM was effectively removed within 30 min with 80% of NPOC removal after 6 h of treatment. The reaction followed a pseudo-first order kinetic equation. The adsorption test on the chitosan beads (with and without iron) demonstrated that the insecticide removal was solely induced by heterogeneous electro-Fenton treatment with Fe3O4-CS beads. In addition, the reusability of this catalyst was effectively demonstrated. Finally, LC–MS analysis allowed the proposal of a plausible degradation route

Modeling of the chemically assisted ion beam etching process: Application to the GaAs etching by Cl-2/Ar+

International audienc

Murine immune response to the Neisseria meningitidis group C capsular polysaccharide: Response to thymus-dependent toxoid conjugate vaccine: Infect.Immun.

NRC publication: Ye

LC analysis of Oxytetracycline and Chlortetracycline: application for in vitro bio-equivalence study of veterinary medicines

A liquid chromatographic method has been applied for the analysis of two antibiotics widely used in the veterinary field, Oxytetracycline dihydrate and Chlortetracycline hydrochloride in premixes for medicated feeding stuffs for veterinary use. In particular, the validated method was employed to study the releasing profile of each drug from two formulations, a commercially available and a new formulation, having different excipient composition. The dissolution profiles obtained from the chromatographic analysis allowed to verify the in vitro bio-equivalence of the commercial and the new formulations for Oxytetracycline and Chlortetracycline