The present study attempted to investigate the best conditions for the use of a mixture of 2-mercaptobenzimidazole and alcohol ethoxylate (C13) as corrosion inhibitor of mild steel in 1 M HCl through the use of the surface response methodology. A matrix of Doelhert to 4 factors was used as the experimental design in this research as it permits the use of the response surface methodology in a spherical field. The response used in the exploitation of the design was the determination of the inhibitor efficiency. It was assessed through gravimetric measurements on samples in the absence and presence of the inhibitor. The results were confirmed using electrochemical impedance spectroscopy (EIS).
This work concerns the use of amorphous tricalcium phosphate and apatitictricalcium phosphate to remove nickel, copper and cobalt ions from aqueous solutions. The amorphous or apatitic calcium phosphates were first exposed to separate solutions of Ni(II), Cu(II) or Co(II) salts for 48 hours at room temperature, then residual solids and solutions were separated and analysed. X-ray photoelectron spectroscopy, X-ray diffraction and infrared spectroscopy were applied to observe chemical and structure modifications in the solid phosphates whereas inductively coupled plasmaatomic emission spectrometry measurements were performed to evaluate the metal ions content changes in both solids and solutions. These analyses and measurements demonstrate the ability of amorphous and apatitic phosphates to remove metal ions from aqueous solutions. They assist in identifying the mechanisms involved in the metal ions transfer from solutions to solid phosphates and clarifying differences with respect to the widely studied hydroxyapatite system. Finally, they reveal, for copper and cobalt ions, the conversion of these phosphates to Cu 2 (PO 4)(OH) and Co 3 (PO 4) 2 .8H 2 O.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.