Magnetic nanoparticles were integrated with graphene oxide sheets modified by metformin to introduce polyamine functionality in structure. Modified magnetic graphene oxide by metformin (MMGO) adsorption ability was studied for removal of methyl violet (MV) and acid red 88 (AR88) at different pH, initial concentration, and contact time. The successful preparation of magnetic nanoparticles supported with modified graphene oxide sheets is evident from FTIR spectra, TGA, zetapotential and magnetic measurements. Morphology and chemical structure of the preparedMMGO nanocompositewas studied by TEM, SEM, XPS and EDS analyses. Surface area measurement of the MMGO composite revealed high BET surface area of 226 m2 g−1. Equilibrium isotherms were employed to evaluate the experimental data and calculate the isotherms' parameters. Results showed that adsorption process is based on Langmuir isotherm (R2 N 0.99) and adsorption capacity of fabricated nano-composite was found to be 243 mg g−1 for MV and 303 mg g−1 for AR88. Kinetical results were based on pseudo-second order (R2 N 0.99) and physisorption was main process in the rate-controlling step.
A direct and efficient carbon-sulfur bond formation method was developed. For the first time, cross-dehydrogenative-coupling (CDC) reaction of an especial type of benzyl ethers (isochroman) and a variety of thiols was investigated. 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) without using any metal catalyst provides a simple and efficient method to construct C-S bond leading to the library of sulfur-containing hetrocyclic compounds. Indeed, we can directly functionalize Csp3-H bond by S-H bond without requiring pre-activation. As a result, this method will increase synthetic efficiency at the most fundamental level of organic synthesis.
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